README

********************************************************************************
Go Snowflake Driver
********************************************************************************

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This topic provides instructions for installing, running, and modifying the Go Snowflake Driver. The driver supports Go's `database/sql <https://golang.org/pkg/database/sql/>`_ package.

Prerequisites
================================================================================

The following software packages are required to use the Go Snowflake Driver.

Go
----------------------------------------------------------------------

The latest driver requires the `Go language <https://golang.org/>`_ 1.14 or higher. The supported operating systems are Linux, Mac OS, and Windows, but you may run the driver on other platforms if the Go language works correctly on those platforms.


Installation
================================================================================

Get Gosnowflake source code, if not installed.

.. code-block:: bash

    go get -u github.com/snowflakedb/gosnowflake

Docs
====

For detailed documentation and basic usage examples, please see the documentation at
`godoc.org <https://godoc.org/github.com/snowflakedb/gosnowflake/>`_.

Sample Programs
================================================================================

Snowflake provides a set of sample programs to test with. Set the environment variable ``$GOPATH`` to the top directory of your workspace, e.g., ``~/go`` and make certain to 
include ``$GOPATH/bin`` in the environment variable ``$PATH``. Run the ``make`` command to build all sample programs.

.. code-block:: go

    make install

In the following example, the program ``select1.go`` is built and installed in ``$GOPATH/bin`` and can be run from the command line:

.. code-block:: bash

    SNOWFLAKE_TEST_ACCOUNT=<your_account> \
    SNOWFLAKE_TEST_USER=<your_user> \
    SNOWFLAKE_TEST_PASSWORD=<your_password> \
    select1
    Congrats! You have successfully run SELECT 1 with Snowflake DB!

Development
================================================================================

The developer notes are hosted with the source code on `GitHub <https://github.com/snowflakedb/gosnowflake>`_.

Testing Code
----------------------------------------------------------------------

Set the Snowflake connection info in ``parameters.json``:

.. code-block:: json

    {
        "testconnection": {
            "SNOWFLAKE_TEST_USER":      "<your_user>",
            "SNOWFLAKE_TEST_PASSWORD":  "<your_password>",
            "SNOWFLAKE_TEST_ACCOUNT":   "<your_account>",
            "SNOWFLAKE_TEST_WAREHOUSE": "<your_warehouse>",
            "SNOWFLAKE_TEST_DATABASE":  "<your_database>",
            "SNOWFLAKE_TEST_SCHEMA":    "<your_schema>",
            "SNOWFLAKE_TEST_ROLE":      "<your_role>"
        }
    }

Install `jq <https://stedolan.github.io/jq/>`_ so that the parameters can get parsed correctly, and run ``make test`` in your Go development environment:

.. code-block:: bash

    make test

Submitting Pull Requests
----------------------------------------------------------------------

You may use your preferred editor to edit the driver code. Make certain to run ``make fmt lint`` before submitting any pull request to Snowflake. This command formats your source code according to the standard Go style and detects any coding style issues.

Support
----------------------------------------------------------------------

For official support, contact Snowflake support at:
https://support.snowflake.net/

Expand ▾ Collapse ▴

Documentation

Overview

Package gosnowflake is a pure Go Snowflake driver for the database/sql package.

Clients can use the database/sql package directly. For example:

import (
	"database/sql"

	_ "github.com/snowflakedb/gosnowflake"
)

func main() {
	db, err := sql.Open("snowflake", "user:password@myaccount/mydb")
	if err != nil {
		log.Fatal(err)
	}
	defer db.Close()
	...
}

Connection String

Use the Open() function to create a database handle with connection parameters:

db, err := sql.Open("snowflake", "<connection string>")

The Go Snowflake Driver supports the following connection syntaxes (or data source name (DSN) formats):

* username[:password]@accountname/dbname/schemaname[?param1=value&...&paramN=valueN
* username[:password]@accountname/dbname[?param1=value&...&paramN=valueN
* username[:password]@hostname:port/dbname/schemaname?account=<your_account>[&param1=value&...&paramN=valueN]

where all parameters must be escaped or use `Config` and `DSN` to construct a DSN string.

The following example opens a database handle with the Snowflake account myaccount where the username is jsmith, password is mypassword, database is mydb, schema is testschema, and warehouse is mywh:

db, err := sql.Open("snowflake", "jsmith:mypassword@myaccount/mydb/testschema?warehouse=mywh")

Connection Parameters

The connection string (DSN) can contain both connection parameters (described below) and session parameters (https://docs.snowflake.com/en/sql-reference/parameters.html).

The following connection parameters are supported:

	* account <string>: Specifies the name of your Snowflake account, where string is the name
		assigned to your account by Snowflake. In the URL you received from
		Snowflake, your account name is the first segment in the domain (e.g.
		abc123 in https://abc123.snowflakecomputing.com). This parameter is
		optional if your account is specified after the @ character. If you
		are not on us-west-2 region or AWS deployment, then append the region
		after the account name, e.g. “<account>.<region>”. If you are not on
		AWS deployment, then append not only the region, but also the platform,
		e.g., “<account>.<region>.<platform>”. Account, region, and platform
		should be separated by a period (“.”), as shown above. If you are using
        a global url, then append connection group and "global",
        e.g., "account-<connection_group>.global". Account and connection group are
        separated by a dash ("-"), as shown above.

	* region <string>: DEPRECATED. You may specify a region, such as
		“eu-central-1”, with this parameter. However, since this parameter
		is deprecated, it is best to specify the region as part of the
		account parameter. For details, see the description of the account
		parameter.

	* database: Specifies the database to use by default in the client session
		(can be changed after login).

	* schema: Specifies the database schema to use by default in the client
		session (can be changed after login).

	* warehouse: Specifies the virtual warehouse to use by default for queries,
		loading, etc. in the client session (can be changed after login).

	* role: Specifies the role to use by default for accessing Snowflake
		objects in the client session (can be changed after login).

	* passcode: Specifies the passcode provided by Duo when using multi-factor authentication (MFA) for login.

	* passcodeInPassword: false by default. Set to true if the MFA passcode is
		embedded in the login password. Appends the MFA passcode to the end of the
		password.

	* loginTimeout: Specifies the timeout, in seconds, for login. The default
		is 60 seconds. The login request gives up after the timeout length if the
		HTTP response is success.

	* authenticator: Specifies the authenticator to use for authenticating user credentials:
		- To use the internal Snowflake authenticator, specify snowflake (Default).
		- To authenticate through Okta, specify https://<okta_account_name>.okta.com (URL prefix for Okta).
		- To authenticate using your IDP via a browser, specify externalbrowser.
		- To authenticate via OAuth, specify oauth and provide an OAuth Access Token (see the token parameter below).

	* application: Identifies your application to Snowflake Support.

	* insecureMode: false by default. Set to true to bypass the Online
		Certificate Status Protocol (OCSP) certificate revocation check.
		IMPORTANT: Change the default value for testing or emergency situations only.

	* token: a token that can be used to authenticate. Should be used in conjunction with the "oauth" authenticator.

	* client_session_keep_alive: Set to true have a heartbeat in the background every hour to keep the connection alive
		such that the connection session will never expire. Care should be taken in using this option as it opens up
		the access forever as long as the process is alive.

	* ocspFailOpen: true by default. Set to false to make OCSP check fail closed mode.

	* validateDefaultParameters: true by default. Set to false to disable checks on existence and privileges check for
								 Database, Schema, Warehouse and Role when setting up the connection

All other parameters are interpreted as session parameters (https://docs.snowflake.com/en/sql-reference/parameters.html). For example, the TIMESTAMP_OUTPUT_FORMAT session parameter can be set by adding:

...&TIMESTAMP_OUTPUT_FORMAT=MM-DD-YYYY...

A complete connection string looks similar to the following:

	my_user_name:my_password@ac123456/my_database/my_schema?my_warehouse=inventory_warehouse&role=my_user_role&DATE_OUTPUT_FORMAT=YYYY-MM-DD
                                                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                                                                      connection                     connection           session
                                                                      parameter                      parameter            parameter

Session-level parameters can also be set by using the SQL command "ALTER SESSION" (https://docs.snowflake.com/en/sql-reference/sql/alter-session.html).

Alternatively, use OpenWithConfig() function to create a database handle with the specified Config.

Proxy

The Go Snowflake Driver honors the environment variables HTTP_PROXY, HTTPS_PROXY and NO_PROXY for the forward proxy setting.

NO_PROXY specifies which hostname endings should be allowed to bypass the proxy server, e.g. :code:`no_proxy=.amazonaws.com` means that AWS S3 access does not need to go through the proxy.

NO_PROXY does not support wildcards. Each value specified should be one of the following:

* The end of a hostname (or a complete hostname), for example: ".amazonaws.com" or "xy12345.snowflakecomputing.com".

* An IP address, for example "192.196.1.15".

If more than one value is specified, values should be separated by commas, for example:

no_proxy=localhost,.my_company.com,xy12345.snowflakecomputing.com,192.168.1.15,192.168.1.16

Logging

By default, the driver's builtin logger is exposing logrus's FieldLogger and default at INFO level. Users can use SetLogger in driver.go to set a customized logger for gosnowflake package.

In order to enable debug logging for the driver, user could use SetLogLevel("debug") in SFLogger interface as shown in demo code at cmd/logger.go. To redirect the logs SFlogger.SetOutput method could do the work.

Query request ID

Specific query request ID can be set in the context and will be passed through in place of the default randomized request ID. For example:

requestID := uuid.MustParse("6ba7b812-9dad-11d1-80b4-00c04fd430c8")
ctxWithID := WithRequestID(ctx, requestID)
rows, err := db.QueryContext(ctxWithID, query)

Canceling Query by CtrlC

From 0.5.0, a signal handling responsibility has moved to the applications. If you want to cancel a query/command by Ctrl+C, add a os.Interrupt trap in context to execute methods that can take the context parameter, e.g., QueryContext, ExecContext.

// handle interrupt signal
ctx, cancel := context.WithCancel(context.Background())
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt)
defer func() {
	signal.Stop(c)
}()
go func() {
	select {
	case <-c:
		cancel()
	case <-ctx.Done():
	}
}()
... (connection)
// execute a query
rows, err := db.QueryContext(ctx, query)
... (Ctrl+C to cancel the query)

See cmd/selectmany.go for the full example.

Supported Data Types

Queries return SQL column type information in the ColumnType type. The DatabaseTypeName method returns strings representing Snowflake data types. The following table shows those strings, the corresponding Snowflake data type, and the corresponding Golang native data type. The columns are:

1. The string representation of the data type.
2. The SQL data type.
3. The default Golang data type that is returned when you use snowflakeRows.Scan() to read data from
   JSON data format via an interface{}. (All returned values are JSON strings.)
4. The standard Golang data type that is returned when you use snowflakeRows.Scan() to read data from
   JSON data format directly.
5. Footnotes numbers.

This table shows the data types:

=============================================================================================
               |                                    | Default Go  | Supported  |
String         |                                    | Data Type   | Go Data    |
Representation | Snowflake Data Type                | for Scan()  | Types for  | Footnotes
               |                                    | interface{} | Scan()     |
               |                                    | (JSON)      | (JSON)     |
==============================================================================================
BOOLEAN        | BOOLEAN                            | string      | bool       |
TEXT           | VARCHAR/STRING                     | string      | string     |
REAL           | REAL/DOUBLE                        | string      | float64    | [1]  [2]
FIXED          | INTEGER that fits in int64         | string      | int64      | [1]  [2]
FIXED          | NUMBER(P, S) where S > 0           | string      |            | [1]  [3]
DATE           | DATE                               | string      | time.Time  |
TIME           | TIME                               | string      | time.Time  |
TIMESTAMP_LTZ  | TIMESTAMP_LTZ                      | string      | time.Time  |
TIMESTAMP_NTZ  | TIMESTAMP_NTZ                      | string      | time.Time  |
TIMESTAMP_TZ   | TIMESTAMP_TZ                       | string      | time.Time  |
BINARY         | BINARY                             | string      | []byte     |
ARRAY          | ARRAY                              | string      | string     |
OBJECT         | OBJECT                             | string      | string     |
VARIANT        | VARIANT                            | string      | string     |

Footnotes:

[1] Converting from a higher precision data type to a lower precision data type via the snowflakeRows.Scan() method can lose low bits (lose precision), lose high bits (completely change the value), or result in error.

[2] Attempting to convert from a higher precision data type to a lower precision data type via interface{} causes an error.

[3] If the value in Snowflake is too large to fit into the corresponding Golang data type, then conversion can return either an int64 with the high bits truncated or an error.

Note: SQL NULL values are converted to Golang nil values, and vice-versa.

Binding Parameters to Array Variables For Batch Inserts

Version 1.3.9 (and later) of the Go Snowflake Driver supports the ability to bind an array variable to a parameter in an SQL INSERT statement. You can use this technique to insert multiple rows in a single batch.

As an example, the following code inserts rows into a table that contains integer, float, boolean, and string columns. The example binds arrays to the parameters in the INSERT statement.

// Create a table containing an integer, float, boolean, and string column.
_, err = db.Exec("create or replace table my_table(c1 int, c2 float, c3 boolean, c4 string)")
...
// Define the arrays containing the data to insert.
intArray := []int{1, 2, 3}
fltArray := []float64{0.1, 2.34, 5.678}
boolArray := []bool{true, false, true}
strArray := []string{"test1", "test2", "test3"}
...
// Insert the data from the arrays and wrap in an Array() function into the table.
_, err = db.Exec("insert into my_table values (?, ?, ?, ?)", Array(&intArray), Array(&fltArray), Array(&boolArray), Array(&strArray))

Note: For alternative ways to load data into the Snowflake database (including bulk loading using the COPY command), see Loading Data Into Snowflake (https://docs.snowflake.com/en/user-guide-data-load.html).

Binding a Parameter to a Time Type

Go's database/sql package supports the ability to bind a parameter in an SQL statement to a time.Time variable. However, when the client binds data to send to the server, the driver cannot determine the correct Snowflake date/timestamp data type to associate with the binding parameter. For example:

dbt.mustExec("CREATE OR REPLACE TABLE tztest (id int, ntz, timestamp_ntz, ltz timestamp_ltz)")
// ...
stmt, err :=dbt.db.Prepare("INSERT INTO tztest(id,ntz,ltz) VALUES(1, ?, ?)")
// ...
tmValue time.Now()
// ... Is tmValue a TIMESTAMP_NTZ or TIMESTAMP_LTZ?
_, err = stmt.Exec(tmValue, tmValue)

To resolve this issue, a binding parameter flag is introduced that associates any subsequent time.Time type to the DATE, TIME, TIMESTAMP_LTZ, TIMESTAMP_NTZ or BINARY data type. The above example could be rewritten as follows:

import (
	sf "github.com/snowflakedb/gosnowflake"
)
dbt.mustExec("CREATE OR REPLACE TABLE tztest (id int, ntz, timestamp_ntz, ltz timestamp_ltz)")
// ...
stmt, err :=dbt.db.Prepare("INSERT INTO tztest(id,ntz,ltz) VALUES(1, ?, ?)")
// ...
tmValue time.Now()
// ...
_, err = stmt.Exec(sf.DataTypeTimestampNtz, tmValue, sf.DataTypeTimestampLtz, tmValue)

Timestamps with Time Zones

The driver fetches TIMESTAMP_TZ (timestamp with time zone) data using the offset-based Location types, which represent a collection of time offsets in use in a geographical area, such as CET (Central European Time) or UTC (Coordinated Universal Time). The offset-based Location data is generated and cached when a Go Snowflake Driver application starts, and if the given offset is not in the cache, it is generated dynamically.

Currently, Snowflake doesn't support the name-based Location types, e.g., "America/Los_Angeles".

For more information about Location types, see the Go documentation for https://golang.org/pkg/time/#Location.

Binary Data

Internally, this feature leverages the []byte data type. As a result, BINARY data cannot be bound without the binding parameter flag. In the following example, sf is an alias for the gosnowflake package:

var b = []byte{0x01, 0x02, 0x03}
_, err = stmt.Exec(sf.DataTypeBinary, b)

Maximum number of Result Set Chunk Downloader

The driver directly downloads a result set from the cloud storage if the size is large. It is required to shift workloads from the Snowflake database to the clients for scale. The download takes place by goroutine named "Chunk Downloader" asynchronously so that the driver can fetch the next result set while the application can consume the current result set.

The application may change the number of result set chunk downloader if required. Note this doesn't help reduce memory footprint by itself. Consider Custom JSON Decoder.

import (
	sf "github.com/snowflakedb/gosnowflake"
)
sf.MaxChunkDownloadWorkers = 2

Experimental: Custom JSON Decoder for parsing Result Set

The application may have the driver use a custom JSON decoder that incrementally parses the result set as follows.

import (
	sf "github.com/snowflakedb/gosnowflake"
)
sf.CustomJSONDecoderEnabled = true
...

This option will reduce the memory footprint to half or even quarter, but it can significantly degrade the performance depending on the environment. The test cases running on Travis Ubuntu box show five times less memory footprint while four times slower. Be cautious when using the option.

JWT authentication

The Go Snowflake Driver supports JWT (JSON Web Token) authentication.

To enable this feature, construct the DSN with fields "authenticator=SNOWFLAKE_JWT&privateKey=<your_private_key>", or using a Config structure specifying:

config := &Config{
	...
	Authenticator: "SNOWFLAKE_JWT"
	PrivateKey:   "<your_private_key_struct in *rsa.PrivateKey type>"
}

The <your_private_key> should be a base64 URL encoded PKCS8 rsa private key string. One way to encode a byte slice to URL base 64 URL format is through the base64.URLEncoding.EncodeToString() function.

On the server side, you can alter the public key with the SQL command:

ALTER USER <your_user_name> SET RSA_PUBLIC_KEY='<your_public_key>';

The <your_public_key> should be a base64 Standard encoded PKI public key string. One way to encode a byte slice to base 64 Standard format is through the base64.StdEncoding.EncodeToString() function.

To generate the valid key pair, you can execute the following commands in the shell:

	# generate 2048-bit pkcs8 encoded RSA private key
	openssl genpkey -algorithm RSA \
    	-pkeyopt rsa_keygen_bits:2048 \
    	-pkeyopt rsa_keygen_pubexp:65537 | \
  		openssl pkcs8 -topk8 -outform der > rsa-2048-private-key.p8

	# extract 2048-bit PKI encoded RSA public key from the private key
	openssl pkey -pubout -inform der -outform der \
    	-in rsa-2048-private-key.p8 \
    	-out rsa-2048-public-key.spki

Note: As of February 2020, Golang's official library does not support passcode-encrypted PKCS8 private key. For security purposes, Snowflake highly recommends that you store the passcode-encrypted private key on the disk and decrypt the key in your application using a library you trust.

Executing Multiple Statements in One Call

This feature is available in version 1.3.8 or later of the driver.

By default, Snowflake returns an error for queries issued with multiple statements. This restriction helps protect against SQL Injection attacks (https://en.wikipedia.org/wiki/SQL_injection).

The multi-statement feature allows users skip this restriction and execute multiple SQL statements through a single Golang function call. However, this opens up the possibility for SQL injection, so it should be used carefully. The risk can be reduced by specifying the exact number of statements to be executed, which makes it more difficult to inject a statement by appending it. More details are below.

The Go Snowflake Driver provides two functions that can execute multiple SQL statements in a single call:

* db.QueryContext(): This function is used to execute queries, such as SELECT statements, that return a result set.
* db.ExecContext(): This function is used to execute statements that don't return a result set (i.e. most DML and DDL statements).

To compose a multi-statement query, simply create a string that contains all the queries, separated by semicolons, in the order in which the statements should be executed.

To protect against SQL Injection attacks while using the multi-statement feature, pass a Context that specifies the number of statements in the string. For example:

import (
	"context"
	"database/sql"
)

var multi_statement_query = "SELECT c1 FROM t1; SELECT c2 FROM t2"
var number_of_statements = 2
blank_context = context.Background()
multi_statement_context, _ := WithMultiStatement(blank_context, number_of_statements)
rows, err := db.QueryContext(multi_statement_context, multi_statement_query)

When multiple queries are executed by a single call to QueryContext(), multiple result sets are returned. After you process the first result set, get the next result set (for the next SQL statement) by calling NextResultSet().

The following pseudo-code shows how to process multiple result sets:

Execute the statement and get the result set(s):

	rows, err := db.QueryContext(ctx, multiStmtQuery)

Retrieve the rows in the first query's result set:

	while rows.Next() {
		err = rows.Scan(&variable_1)
		if err != nil {
			t.Errorf("failed to scan: %#v", err)
		}
		...
	}

Retrieve the remaining result sets and the rows in them:

	while rows.NextResultSet()  {

		while rows.Next() {
			...
		}

	}

The function db.ExecContext() returns a single result, which is the sum of the number of rows changed by each individual statement. For example, if your multi-statement query executed two UPDATE statements, each of which updated 10 rows, then the result returned would be 20. Individual row counts for individual statements are not available.

The following code shows how to retrieve the result of a multi-statement query executed through db.ExecContext():

Execute the SQL statements:

    res, err := db.ExecContext(ctx, multiStmtQuery)

Get the summed result and store it in the variable named count:

    count, err := res.RowsAffected()

Note: Because a multi-statement ExecContext() returns a single value, you cannot detect offsetting errors. For example, suppose you expected the return value to be 20 because you expected each UPDATE statement to update 10 rows. If one UPDATE statement updated 15 rows and the other UPDATE statement updated only 5 rows, the total would still be 20. You would see no indication that the UPDATES had not functioned as expected.

The ExecContext() function does not return an error if passed a query (e.g. a SELECT statement). However, it still returns only a single value, not a result set, so using it to execute queries (or a mix of queries and non-query statements) is impractical.

The QueryContext() function does not return an error if passed non-query statements (e.g. DML). The function returns a result set for each statement, whether or not the statement is a query. For each non-query statement, the result set contains a single row that contains a single column; the value is the number of rows changed by the statement.

If you want to execute a mix of query and non-query statements (e.g. a mix of SELECT and DML statements) in a multi-statement query, use QueryContext(). You can retrieve the result sets for the queries, and you can retrieve or ignore the row counts for the non-query statements.

If a SQL statement passed to ExecQuery() or QueryContext() fails to compile or execute, that statement is aborted, and subsequent statements are not executed. Any statements prior to the aborted statement are unaffected.

For example, if the statements below are run as one multi-statement query, the multi-statement query fails on the third statement, and an exception is thrown.

CREATE OR REPLACE TABLE test(n int);
INSERT INTO TEST VALUES (1), (2);
INSERT INTO TEST VALUES ('not_an_integer');  -- execution fails here
INSERT INTO TEST VALUES (3);

If you then query the contents of the table named "test", the values 1 and 2 would be present.

When using the QueryContext() and ExecContext() functions, golang code can check for errors the usual way. For example:

rows, err := db.QueryContext(ctx, multiStmtQuery)
if err != nil {
	Fatalf("failed to query multiple statements: %v", err)
}

Preparing statements and using bind variables are also not supported for multi-statement queries.

Aysnchronous Queries

The Go Snowflake Driver supports asynchronous execution of SQL statements. Asynchronous execution allows you to start executing a statement and then retrieve the result later without being blocked while waiting. While waiting for the result of a SQL statement, you can perform other tasks, including executing other SQL statements.

Most of the steps to execute an asynchronous query are the same as the steps to execute a synchronous query. However, there is an additional step, which is that you must call the WithAsyncMode() function to update your Context object to specify that asynchronous mode is enabled.

In the code below, the call to "WithAsyncMode()" is specific to asynchronous mode. The rest of the code is compatible with both asynchronous mode and synchronous mode.

...

// Update your Context object to specify asynchronous mode:
ctx := WithAsyncMode(context.Background())

// Execute your query as usual by calling:
rows, _ := db.QueryContext(ctx, query_string)

// Retrieve the results as usual by calling:
for rows.Next()  {
	err := rows.Scan(...)
	...
}

The function db.QueryContext() returns an object of type snowflakeRows regardless of whether the query is synchronous or asynchronous. However:

* If the query is synchronous, then db.QueryContext() does not return until
	the query has finished and the result set has been loaded into the
	snowflakeRows object.
* If the query is asynchronous, then db.QueryContext() returns a
	potentially incomplete snowflakeRows object that is filled in later
	in the background.

The call to the Next() function of snowflakeRows is always synchronous (i.e. blocking). If the query has not yet completed and the snowflakeRows object (named "rows" in this example) has not been filled in yet, then rows.Next() waits until the result set has been filled in.

More generally, calls to any Golang SQL API function implemented in snowflakeRows or snowflakeResult are blocking calls, and wait if results aren’t yet available. (Examples of other synchronous calls include: snowflakeRows.Err(), snowflakeRows.Columns(), snowflakeRows.columnTypes(), snowflakeRows.Scan(), and snowflakeResult.RowsAffected().)

Because the example code above executes only one query and no other activity, there is no significant difference in behavior between asynchronous and synchronous behavior. The differences become significant if, for example, you want to perform some other activity after the query starts and before it completes. The example code below starts multiple queries, which run in the background, and then retrieves the results later.

This example uses small SELECT statements that do not retrieve enough data to require asynchronous handling. However, the technique works for larger data sets, and for situations where the programmer might want to do other work after starting the queries and before retrieving the results.

package gosnowflake

import  (
	"context"
	"database/sql"
	"database/sql/driver"
	"fmt"
	"log"
	"os"
	sf "github.com/snowflakedb/gosnowflake"
	)

...

func DemonstrateAsyncMode(db *sql.DB) {

	// Enable asynchronous mode.
	ctx := WithAsyncMode(context.Background())

	// Execute the first query asynchronously.
	rows_1, _ := db.QueryContext(ctx, fmt.Sprintf("SELECT 1.23"))
	defer rows_1.Close()

	// Execute the second query asynchronously.
	rows_2, _ := db.QueryContext(ctx, fmt.Sprintf("SELECT 3.21"))
	defer rows_2.Close()

	// Retrieve and check the results of the first query.
	CheckResults(rows_1, 1.23)

	// Retrieve and check the results of the second query.
	CheckResults(rows_2, 3.21)
}

Limitations

GET and PUT operations are unsupported.

Index

Constants

View Source
const (

	// ErrCodeEmptyAccountCode is an error code for the case where a DNS doesn't include account parameter
	ErrCodeEmptyAccountCode = 260000
	// ErrCodeEmptyUsernameCode is an error code for the case where a DNS doesn't include user parameter
	ErrCodeEmptyUsernameCode = 260001
	// ErrCodeEmptyPasswordCode is an error code for the case where a DNS doesn't include password parameter
	ErrCodeEmptyPasswordCode = 260002
	// ErrCodeFailedToParseHost is an error code for the case where a DNS includes an invalid host name
	ErrCodeFailedToParseHost = 260003
	// ErrCodeFailedToParsePort is an error code for the case where a DNS includes an invalid port number
	ErrCodeFailedToParsePort = 260004
	// ErrCodeIdpConnectionError is an error code for the case where a IDP connection failed
	ErrCodeIdpConnectionError = 260005
	// ErrCodeSSOURLNotMatch is an error code for the case where a SSO URL doesn't match
	ErrCodeSSOURLNotMatch = 260006
	// ErrCodeServiceUnavailable is an error code for the case where service is unavailable.
	ErrCodeServiceUnavailable = 260007
	// ErrCodeFailedToConnect is an error code for the case where a DB connection failed due to wrong account name
	ErrCodeFailedToConnect = 260008
	// ErrCodeRegionOverlap is an error code for the case where a region is specified despite an account region present
	ErrCodeRegionOverlap = 260009
	// ErrCodePrivateKeyParseError is an error code for the case where the private key is not parsed correctly
	ErrCodePrivateKeyParseError = 260010
	// ErrCodeFailedToParseAuthenticator is an error code for the case where a DNS includes an invalid authenticator
	ErrCodeFailedToParseAuthenticator = 260011

	// ErrFailedToPostQuery is an error code for the case where HTTP POST failed.
	ErrFailedToPostQuery = 261000
	// ErrFailedToRenewSession is an error code for the case where session renewal failed.
	ErrFailedToRenewSession = 261001
	// ErrFailedToCancelQuery is an error code for the case where cancel query failed.
	ErrFailedToCancelQuery = 261002
	// ErrFailedToCloseSession is an error code for the case where close session failed.
	ErrFailedToCloseSession = 261003
	// ErrFailedToAuth is an error code for the case where authentication failed for unknown reason.
	ErrFailedToAuth = 261004
	// ErrFailedToAuthSAML is an error code for the case where authentication via SAML failed for unknown reason.
	ErrFailedToAuthSAML = 261005
	// ErrFailedToAuthOKTA is an error code for the case where authentication via OKTA failed for unknown reason.
	ErrFailedToAuthOKTA = 261006
	// ErrFailedToGetSSO is an error code for the case where authentication via OKTA failed for unknown reason.
	ErrFailedToGetSSO = 261007
	// ErrFailedToParseResponse is an error code for when we cannot parse an external browser response from Snowflake.
	ErrFailedToParseResponse = 261008
	// ErrFailedToGetExternalBrowserResponse is an error code for when there's an error reading from the open socket.
	ErrFailedToGetExternalBrowserResponse = 261009
	// ErrFailedToHeartbeat is an error code when a heartbeat fails.
	ErrFailedToHeartbeat = 261010

	// ErrFailedToGetChunk is an error code for the case where it failed to get chunk of result set
	ErrFailedToGetChunk = 262000

	// ErrNoReadOnlyTransaction is an error code for the case where readonly mode is specified.
	ErrNoReadOnlyTransaction = 263000
	// ErrNoDefaultTransactionIsolationLevel is an error code for the case where non default isolation level is specified.
	ErrNoDefaultTransactionIsolationLevel = 263001

	// ErrInvalidStageFs is an error code denoting an inavlid stage in the file system
	ErrInvalidStageFs = 264001
	// ErrFailedToUploadToStage is an error code denoting the failure to upload a file to the stage
	ErrFailedToUploadToStage = 264003
	// ErrInvalidStageLocation is an error code denoting an invalid stage location
	ErrInvalidStageLocation = 264004
	// ErrLocalPathNotDirectory is an error code denoting a local path that is not a directory
	ErrLocalPathNotDirectory = 264005
	// ErrFileNotExists is an error code denoting the file to be transferred does not exist
	ErrFileNotExists = 264006
	// ErrCompressionNotSupported is an error code denoting the user specified compression type is not supported
	ErrCompressionNotSupported = 264007
	// ErrInternalNotMatchEncryptMaterial is an error code denoting the encryption material specified does not match
	ErrInternalNotMatchEncryptMaterial = 264008

	// ErrBindSerialization is an error code for a failed serialization of bind variables
	ErrBindSerialization = 265001
	// ErrBindUpload is an error code for the uploading process of bind elements to the stage
	ErrBindUpload = 265002

	// ErrInvalidTimestampTz is an error code for the case where a returned TIMESTAMP_TZ internal value is invalid
	ErrInvalidTimestampTz = 268000
	// ErrInvalidOffsetStr is an error code for the case where a offset string is invalid. The input string must
	// consist of sHHMI where one sign character '+'/'-' followed by zero filled hours and minutes
	ErrInvalidOffsetStr = 268001
	// ErrInvalidBinaryHexForm is an error code for the case where a binary data in hex form is invalid.
	ErrInvalidBinaryHexForm = 268002

	// ErrOCSPStatusRevoked is an error code for the case where the certificate is revoked.
	ErrOCSPStatusRevoked = 269001
	// ErrOCSPStatusUnknown is an error code for the case where the certificate revocation status is unknown.
	ErrOCSPStatusUnknown = 269002
	// ErrOCSPInvalidValidity is an error code for the case where the OCSP response validity is invalid.
	ErrOCSPInvalidValidity = 269003
	// ErrOCSPNoOCSPResponderURL is an error code for the case where the OCSP responder URL is not attached.
	ErrOCSPNoOCSPResponderURL = 269004

	// ErrQueryStatus when check the status of a query, receive error or no status
	ErrQueryStatus = 279001
	// ErrQueryIDFormat the query ID given to fetch its result is not valid
	ErrQueryIDFormat = 279101
	// ErrQueryReportedError server side reports the query failed with error
	ErrQueryReportedError = 279201
	// ErrQueryIsRunning the query is still running
	ErrQueryIsRunning = 279301

	// ErrSessionGone is an GS error code for the case that session is already closed
	ErrSessionGone = 390111
	// ErrRoleNotExist is a GS error code for the case that the role specified does not exist
	ErrRoleNotExist = 390189
	// ErrObjectNotExistOrAuthorized is a GS error code for the case that the server-side object specified does not exist
	ErrObjectNotExistOrAuthorized = 390201
)
View Source
const (
	SFQueryRunning = iota
	SFQueryAborting
	SFQuerySuccess
	SFQueryFailedWithError
	SFQueryAborted
	SFQueryQueued
	SFQueryFailedWithIncident
	SFQueryDisconnected
	SFQueryResumingWarehouse
	// SFQueryQueueRepairingWarehouse present in QueryDTO.java.
	SFQueryQueueRepairingWarehouse
	SFQueryRestarted

	// SFQueryBlocked the state when a statement is waiting on a lock on resource held by another statement.
	SFQueryBlocked
	SFQueryNoData
)

    Query Status defined at server side

    View Source
    const (
    
    	// QueryStatusWaiting denotes a query execution waiting to happen
    	QueryStatusWaiting queryStatus = "queryStatusWaiting"
    	// QueryStatusInProgress denotes a query execution in progress
    	QueryStatusInProgress queryStatus = "queryStatusInProgress"
    	// QueryStatusComplete denotes a completed query execution
    	QueryStatusComplete queryStatus = "queryStatusComplete"
    	// QueryFailed denotes a failed query
    	QueryFailed queryStatus = "queryFailed"
    )
    View Source
    const (
    	// SQLStateNumericValueOutOfRange is a SQL State code indicating Numeric value is out of range.
    	SQLStateNumericValueOutOfRange = "22003"
    	// SQLStateInvalidDataTimeFormat is a SQL State code indicating DataTime format is invalid.
    	SQLStateInvalidDataTimeFormat = "22007"
    	// SQLStateConnectionWasNotEstablished is a SQL State code indicating connection was not established.
    	SQLStateConnectionWasNotEstablished = "08001"
    	// SQLStateConnectionRejected is a SQL State code indicating connection was rejected.
    	SQLStateConnectionRejected = "08004"
    	// SQLStateConnectionFailure is a SQL State code indicating connection failed.
    	SQLStateConnectionFailure = "08006"
    	// SQLStateFeatureNotSupported is a SQL State code indicating the feature is not enabled.
    	SQLStateFeatureNotSupported = "0A000"
    )
    View Source
    const (
    
    	// FetchResultByID the queryID of query result to fetch
    	FetchResultByID contextKey = "SF_FETCH_RESULT_BY_ID"
    )
    View Source
    const SFSessionIDKey contextKey = "LOG_SESSION_ID"

      SFSessionIDKey is context key of session id

      View Source
      const SFSessionUserKey contextKey = "LOG_USER"

        SFSessionUserKey is context key of user id of a session

        View Source
        const SnowflakeGoDriverVersion = "1.4.2"

          SnowflakeGoDriverVersion is the version of Go Snowflake Driver.

          Variables

          View Source
          var (
          	// DataTypeFixed is a FIXED datatype.
          	DataTypeFixed = []byte{fixedType.Byte()}
          	// DataTypeReal is a REAL datatype.
          	DataTypeReal = []byte{realType.Byte()}
          	// DataTypeText is a TEXT datatype.
          	DataTypeText = []byte{textType.Byte()}
          	// DataTypeDate is a Date datatype.
          	DataTypeDate = []byte{dateType.Byte()}
          	// DataTypeVariant is a TEXT datatype.
          	DataTypeVariant = []byte{variantType.Byte()}
          	// DataTypeTimestampLtz is a TIMESTAMP_LTZ datatype.
          	DataTypeTimestampLtz = []byte{timestampLtzType.Byte()}
          	// DataTypeTimestampNtz is a TIMESTAMP_NTZ datatype.
          	DataTypeTimestampNtz = []byte{timestampNtzType.Byte()}
          	// DataTypeTimestampTz is a TIMESTAMP_TZ datatype.
          	DataTypeTimestampTz = []byte{timestampTzType.Byte()}
          	// DataTypeObject is a OBJECT datatype.
          	DataTypeObject = []byte{objectType.Byte()}
          	// DataTypeArray is a ARRAY datatype.
          	DataTypeArray = []byte{arrayType.Byte()}
          	// DataTypeBinary is a BINARY datatype.
          	DataTypeBinary = []byte{binaryType.Byte()}
          	// DataTypeTime is a TIME datatype.
          	DataTypeTime = []byte{timeType.Byte()}
          	// DataTypeBoolean is a BOOLEAN datatype.
          	DataTypeBoolean = []byte{booleanType.Byte()}
          )
          View Source
          var (
          	// ErrEmptyAccount is returned if a DNS doesn't include account parameter.
          	ErrEmptyAccount = &SnowflakeError{
          		Number:  ErrCodeEmptyAccountCode,
          		Message: "account is empty",
          	}
          	// ErrEmptyUsername is returned if a DNS doesn't include user parameter.
          	ErrEmptyUsername = &SnowflakeError{
          		Number:  ErrCodeEmptyUsernameCode,
          		Message: "user is empty",
          	}
          	// ErrEmptyPassword is returned if a DNS doesn't include password parameter.
          	ErrEmptyPassword = &SnowflakeError{
          		Number:  ErrCodeEmptyPasswordCode,
          		Message: "password is empty"}
          
          	// ErrInvalidRegion is returned if a DSN's implicit region from account parameter and explicit region parameter conflict.
          	ErrInvalidRegion = &SnowflakeError{
          		Number:  ErrCodeRegionOverlap,
          		Message: "two regions specified"}
          )
          View Source
          var (
          	// MaxChunkDownloadWorkers specifies the maximum number of goroutines used to download chunks
          	MaxChunkDownloadWorkers = 10
          
          	// CustomJSONDecoderEnabled has the chunk downloader use the custom JSON decoder to reduce memory footprint.
          	CustomJSONDecoderEnabled = false
          )
          View Source
          var LogKeys = [...]contextKey{SFSessionIDKey, SFSessionUserKey}

            LogKeys these keys in context should be included in logging messages when using logger.WithContext

            View Source
            var SnowflakeTransport = &http.Transport{
            	TLSClientConfig: &tls.Config{
            		RootCAs:               certPool,
            		VerifyPeerCertificate: verifyPeerCertificateSerial,
            	},
            	MaxIdleConns:    10,
            	IdleConnTimeout: 30 * time.Minute,
            	Proxy:           http.ProxyFromEnvironment,
            	DialContext: (&net.Dialer{
            		Timeout:   30 * time.Second,
            		KeepAlive: 30 * time.Second,
            	}).DialContext,
            }

              SnowflakeTransport includes the certificate revocation check with OCSP in sequential. By default, the driver uses this transport object.

              View Source
              var SnowflakeTransportTest = SnowflakeTransport

                SnowflakeTransportTest includes the certificate revocation check in parallel

                Functions

                func Array

                func Array(a interface{}) interface{}

                  Array takes in a column of a row to be inserted via array binding, bulk or otherwise, and converts it into a native snowflake type for binding

                  func DSN

                  func DSN(cfg *Config) (dsn string, err error)

                    DSN constructs a DSN for Snowflake db.

                    func Location

                    func Location(offset int) *time.Location

                      Location returns an offset (minutes) based Location object for Snowflake database.

                      func LocationWithOffsetString

                      func LocationWithOffsetString(offsets string) (loc *time.Location, err error)

                        LocationWithOffsetString returns an offset based Location object. The offset string must consist of sHHMI where one sign character '+'/'-' followed by zero filled hours and minutes.

                        func SFCallerPrettyfier

                        func SFCallerPrettyfier(frame *runtime.Frame) (string, string)

                          SFCallerPrettyfier to provide base file name and function name from calling frame used in SFLogger

                          func SetLogger

                          func SetLogger(inLogger *SFLogger)

                            SetLogger set a new logger of SFLogger interface for gosnowflake

                            func WithAsyncMode

                            func WithAsyncMode(ctx context.Context) context.Context

                              WithAsyncMode returns a context that allows execution of query in async mode

                              func WithMultiStatement

                              func WithMultiStatement(ctx context.Context, num int) (context.Context, error)

                                WithMultiStatement returns a context that allows the user to execute the desired number of sql queries in one query

                                func WithQueryIDChan

                                func WithQueryIDChan(ctx context.Context, c chan<- string) context.Context

                                  WithQueryIDChan returns a context that contains the channel to receive the query ID

                                  func WithRequestID

                                  func WithRequestID(ctx context.Context, requestID uuid.UUID) context.Context

                                    WithRequestID returns a new context with the specified snowflake request id

                                    func WithStreamDownloader

                                    func WithStreamDownloader(ctx context.Context) context.Context

                                      WithStreamDownloader returns a context that allows the use of a stream based chunk downloader

                                      Types

                                      type AuthType

                                      type AuthType int

                                        AuthType indicates the type of authentication in Snowflake

                                        const (
                                        	// AuthTypeSnowflake is the general username password authentication
                                        	AuthTypeSnowflake AuthType = iota
                                        	// AuthTypeOAuth is the OAuth authentication
                                        	AuthTypeOAuth
                                        	// AuthTypeExternalBrowser is to use a browser to access an Fed and perform SSO authentication
                                        	AuthTypeExternalBrowser
                                        	// AuthTypeOkta is to use a native okta URL to perform SSO authentication on Okta
                                        	AuthTypeOkta
                                        	// AuthTypeJwt is to use Jwt to perform authentication
                                        	AuthTypeJwt
                                        	// AuthTypeTokenAccessor is to use the provided token accessor and bypass authentication
                                        	AuthTypeTokenAccessor
                                        )

                                        func (AuthType) String

                                        func (authType AuthType) String() string

                                        type Config

                                        type Config struct {
                                        	Account   string // Account name
                                        	User      string // Username
                                        	Password  string // Password (requires User)
                                        	Database  string // Database name
                                        	Schema    string // Schema
                                        	Warehouse string // Warehouse
                                        	Role      string // Role
                                        	Region    string // Region
                                        
                                        	// ValidateDefaultParameters disable the validation checks for Database, Schema, Warehouse and Role
                                        	// at the time a connection is established
                                        	ValidateDefaultParameters ConfigBool
                                        
                                        	Params map[string]*string // other connection parameters
                                        
                                        	ClientIP net.IP // IP address for network check
                                        	Protocol string // http or https (optional)
                                        	Host     string // hostname (optional)
                                        	Port     int    // port (optional)
                                        
                                        	Authenticator AuthType // The authenticator type
                                        
                                        	Passcode           string
                                        	PasscodeInPassword bool
                                        
                                        	OktaURL *url.URL
                                        
                                        	LoginTimeout     time.Duration // Login retry timeout EXCLUDING network roundtrip and read out http response
                                        	RequestTimeout   time.Duration // request retry timeout EXCLUDING network roundtrip and read out http response
                                        	JWTExpireTimeout time.Duration // JWT expire after timeout
                                        	ClientTimeout    time.Duration // Timeout for network round trip + read out http response
                                        
                                        	Application  string           // application name.
                                        	InsecureMode bool             // driver doesn't check certificate revocation status
                                        	OCSPFailOpen OCSPFailOpenMode // OCSP Fail Open
                                        
                                        	Token            string        // Token to use for OAuth other forms of token based auth
                                        	TokenAccessor    TokenAccessor // Optional token accessor to use
                                        	KeepSessionAlive bool          // Enables the session to persist even after the connection is closed
                                        
                                        	PrivateKey *rsa.PrivateKey // Private key used to sign JWT
                                        
                                        	Transporter http.RoundTripper // RoundTripper to intercept HTTP requests and responses
                                        }

                                          Config is a set of configuration parameters

                                          func ParseDSN

                                          func ParseDSN(dsn string) (cfg *Config, err error)

                                            ParseDSN parses the DSN string to a Config.

                                            type ConfigBool

                                            type ConfigBool uint8

                                              ConfigBool is a type to represent true or false in the Config

                                              const (
                                              
                                              	// ConfigBoolTrue represents true for the config field
                                              	ConfigBoolTrue ConfigBool
                                              	// ConfigBoolFalse represents false for the config field
                                              	ConfigBoolFalse
                                              )

                                              type Connector

                                              type Connector struct {
                                              	// contains filtered or unexported fields
                                              }

                                                Connector creates Driver with the specified Config

                                                func NewConnector

                                                func NewConnector(driver InternalSnowflakeDriver, config Config) Connector

                                                  NewConnector creates a new connector with the given SnowflakeDriver and Config.

                                                  func (Connector) Connect

                                                  func (t Connector) Connect(ctx context.Context) (driver.Conn, error)

                                                    Connect creates a new connection.

                                                    func (Connector) Driver

                                                    func (t Connector) Driver() driver.Driver

                                                      Driver creates a new driver.

                                                      type FuncGetType

                                                      type FuncGetType func(context.Context, *snowflakeRestful, *url.URL, map[string]string, time.Duration) (*http.Response, error)

                                                        FuncGetType httpclient GET method to return http.Response

                                                        type FuncPostType

                                                        type FuncPostType func(context.Context, *snowflakeRestful, *url.URL, map[string]string, []byte, time.Duration, bool) (*http.Response, error)

                                                          FuncPostType httpclient POST method to return http.Response

                                                          type InternalClient

                                                          type InternalClient interface {
                                                          	Get(context.Context, *url.URL, map[string]string, time.Duration) (*http.Response, error)
                                                          	Post(context.Context, *url.URL, map[string]string, []byte, time.Duration, bool) (*http.Response, error)
                                                          }

                                                            InternalClient is implemented by HTTPClient

                                                            type InternalSnowflakeDriver

                                                            type InternalSnowflakeDriver interface {
                                                            	Open(dsn string) (driver.Conn, error)
                                                            	OpenWithConfig(ctx context.Context, config Config) (driver.Conn, error)
                                                            }

                                                              InternalSnowflakeDriver is the interface for an internal Snowflake driver

                                                              type OCSPFailOpenMode

                                                              type OCSPFailOpenMode uint32

                                                                OCSPFailOpenMode is OCSP fail open mode. OCSPFailOpenTrue by default and may set to ocspModeFailClosed for fail closed mode

                                                                const (
                                                                
                                                                	// OCSPFailOpenTrue represents OCSP fail open mode.
                                                                	OCSPFailOpenTrue OCSPFailOpenMode
                                                                	// OCSPFailOpenFalse represents OCSP fail closed mode.
                                                                	OCSPFailOpenFalse
                                                                )

                                                                type QueryStatusFromServer

                                                                type QueryStatusFromServer int

                                                                  QueryStatusFromServer status returned from server

                                                                  type SFLogger

                                                                  type SFLogger interface {
                                                                  	rlog.Ext1FieldLogger
                                                                  	SetLogLevel(level string) error
                                                                  	WithContext(ctx context.Context) *rlog.Entry
                                                                  	SetOutput(output io.Writer)
                                                                  }

                                                                    SFLogger Snowflake logger interface to expose FieldLogger defined in logrus

                                                                    func CreateDefaultLogger

                                                                    func CreateDefaultLogger() SFLogger

                                                                      CreateDefaultLogger return a new instance of SFLogger with default config

                                                                      func GetLogger

                                                                      func GetLogger() SFLogger

                                                                        GetLogger return logger that is not public

                                                                        type SnowflakeDriver

                                                                        type SnowflakeDriver struct {
                                                                        }

                                                                          SnowflakeDriver is a context of Go Driver

                                                                          func (SnowflakeDriver) Open

                                                                          func (d SnowflakeDriver) Open(dsn string) (driver.Conn, error)

                                                                            Open creates a new connection.

                                                                            func (SnowflakeDriver) OpenWithConfig

                                                                            func (d SnowflakeDriver) OpenWithConfig(ctx context.Context, config Config) (driver.Conn, error)

                                                                              OpenWithConfig creates a new connection with the given Config.

                                                                              type SnowflakeError

                                                                              type SnowflakeError struct {
                                                                              	Number         int
                                                                              	SQLState       string
                                                                              	QueryID        string
                                                                              	Message        string
                                                                              	MessageArgs    []interface{}
                                                                              	IncludeQueryID bool // TODO: populate this in connection
                                                                              }

                                                                                SnowflakeError is a error type including various Snowflake specific information.

                                                                                func (*SnowflakeError) Error

                                                                                func (se *SnowflakeError) Error() string

                                                                                type SnowflakeParameter

                                                                                type SnowflakeParameter struct {
                                                                                	Key                       string
                                                                                	Value                     string
                                                                                	Default                   string
                                                                                	Level                     string
                                                                                	Description               string
                                                                                	SetByUser                 string
                                                                                	SetInJob                  string
                                                                                	SetOn                     string
                                                                                	SetByThreadID             string
                                                                                	SetByThreadName           string
                                                                                	SetByClass                string
                                                                                	ParameterComment          string
                                                                                	Type                      string
                                                                                	IsExpired                 string
                                                                                	ExpiresAt                 string
                                                                                	SetByControllingParameter string
                                                                                	ActivateVersion           string
                                                                                	PartialRollout            string
                                                                                	Unknown                   string // Reserve for added parameter
                                                                                }

                                                                                  SnowflakeParameter includes the columns output from SHOW PARAMETER command.

                                                                                  func ScanSnowflakeParameter

                                                                                  func ScanSnowflakeParameter(rows *sql.Rows) (*SnowflakeParameter, error)

                                                                                    ScanSnowflakeParameter binds SnowflakeParameter variable with an array of column buffer.

                                                                                    type SnowflakeResult

                                                                                    type SnowflakeResult interface {
                                                                                    	GetQueryID() string
                                                                                    	GetStatus() queryStatus
                                                                                    }

                                                                                      SnowflakeResult provides the associated query ID

                                                                                      type TokenAccessor

                                                                                      type TokenAccessor interface {
                                                                                      	GetTokens() (token string, masterToken string, sessionID int)
                                                                                      	SetTokens(token string, masterToken string, sessionID int)
                                                                                      	Lock() error
                                                                                      	Unlock()
                                                                                      }

                                                                                        TokenAccessor manages the session token and master token

                                                                                        Directories

                                                                                        Path Synopsis
                                                                                        benchmark
                                                                                        jsonresultset
                                                                                        Package jsonresultset is a benchmark for large json result sets This exists to mitigate "no non-test Go files" in the latest Go
                                                                                        Package jsonresultset is a benchmark for large json result sets This exists to mitigate "no non-test Go files" in the latest Go
                                                                                        largesetresult
                                                                                        Package largesetresult is a benchmark for large result sets This exists to mitigate "no non-test Go files" in the latest Go
                                                                                        Package largesetresult is a benchmark for large result sets This exists to mitigate "no non-test Go files" in the latest Go
                                                                                        cmd
                                                                                        keepalive
                                                                                        Example: client session keep alive By default, the token expires in 4 hours if the connection is idle.
                                                                                        Example: client session keep alive By default, the token expires in 4 hours if the connection is idle.
                                                                                        noconnpool
                                                                                        Example: No connection pool Setting the pool size to 1, a single session is used at all times.
                                                                                        Example: No connection pool Setting the pool size to 1, a single session is used at all times.
                                                                                        oauth
                                                                                        Example: Authenticate with OAuth.
                                                                                        Example: Authenticate with OAuth.
                                                                                        select1
                                                                                        Example: Fetch one row.
                                                                                        Example: Fetch one row.
                                                                                        selectmany
                                                                                        Example: Fetch many rows and allow cancel the query by Ctrl+C.
                                                                                        Example: Fetch many rows and allow cancel the query by Ctrl+C.
                                                                                        showparam
                                                                                        Example: Set the session parameter in DSN and verify it
                                                                                        Example: Set the session parameter in DSN and verify it
                                                                                        verifycert
                                                                                        Example: Verify SSL/TLS certificate with OCSP revocation check
                                                                                        Example: Verify SSL/TLS certificate with OCSP revocation check