go_ibm_db

package module
Version: v0.4.1 Latest Latest
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Published: Apr 8, 2021 License: BSD-3-Clause Imports: 15 Imported by: 8

README

go_ibm_db

Interface for GoLang to DB2 for z/OS, DB2 for LUW, DB2 for i.

API Documentation

For complete list of go_ibm_db APIs and examples please check APIDocumentation.md

Prerequisite

Golang should be installed(Golang version should be >=1.12.x and <= 1.16.X)

Git should be installed in your system.

For non-windows users, GCC and tar should be present in your system.

For Docker Linux Container(Ex: Amazon Linux2), use below commands:
yum install go git tar libpam

How to Install in Windows

go get -d github.com/ibmdb/go_ibm_db

If you already have a cli driver available in your system, add the path of the same to your Path windows environment variable
Example: Path = C:\Program Files\IBM\IBM DATA SERVER DRIVER\bin


If you do not have a clidriver in your system, go to installer folder where go_ibm_db is downloaded in your system (Example: C:\Users\uname\go\src\github.com\ibmdb\go_ibm_db\installer or C:\Users\uname\go\pkg\mod\github.com\ibmdb\go_ibm_db\installer ) and run setup.go file (go run setup.go).

where uname is the username

Above command will download clidriver.

Add the path of the clidriver downloaded to your Path windows environment variable
(Example: Path=C:\Users\rakhil\go\src\github.com\ibmdb\clidriver\bin)


How to Install in Linux/Mac

go get -d github.com/ibmdb/go_ibm_db

If you already have a cli driver available in your system, set the below environment variables with the clidriver path

export DB2HOME=/home/rakhil/dsdriver
export CGO_CFLAGS=-I$DB2HOME/include
export CGO_LDFLAGS=-L$DB2HOME/lib 
Linux:
export LD_LIBRARY_PATH=/home/rakhil/dsdriver/lib
Mac:
export DYLD_LIBRARY_PATH=$DYLD_LIBRARY_PATH:/Applications/dsdriver/lib

If you do not have a clidriver available in your system
go to installer folder where go_ibm_db is downloaded in your system (Example: /home/uname/go/src/github.com/ibmdb/go_ibm_db/installer or /home/uname/go/pkg/mod/github.com/ibmdb/go_ibm_db/installer) and run setup.go file (go run setup.go)
where uname is the username

Above command will download clidriver.

Set the below envronment variables with the path of the clidriver downloaded

export DB2HOME=/home/uname/go/src/github.com/ibmdb/clidriver
export CGO_CFLAGS=-I$DB2HOME/include
export CGO_LDFLAGS=-L$DB2HOME/lib
Linux:
export LD_LIBRARY_PATH=/home/uname/go/src/github.com/ibmdb/clidriver/lib
Mac:
export DYLD_LIBRARY_PATH=$DYLD_LIBRARY_PATH:/home/uname/go/src/github.com/ibmdb/clidriver/lib


License requirements for connecting to databases

go_ibm_db driver can connect to DB2 on Linux Unix and Windows without any additional license/s, however, connecting to databases on DB2 for z/OS or DB2 for i(AS400) Servers require either client side or server side license/s. The client side license would need to be copied under license folder of your clidriver installation directory and for activating server side license, you would need to purchase DB2 Connect Unlimited for System z® and DB2 Connect Unlimited Edition for System i®.

To know more about license and purchasing cost, please contact IBM Customer Support.

To know more about server based licensing viz db2connectactivate, follow below links:

How to run sample program

example1.go:-
package main

import (
	"database/sql"
	"fmt"
	_ "github.com/ibmdb/go_ibm_db"
)

func main() {
	con := "HOSTNAME=host;DATABASE=name;PORT=number;UID=username;PWD=password"
	db, err := sql.Open("go_ibm_db", con)
	if err != nil {
		fmt.Println(err)
	}
	db.Close()
}

To run the sample:- go run example1.go

For complete list of connection parameters please check this.

example2.go:-
package main

import (
	"database/sql"
	"fmt"
	_ "github.com/ibmdb/go_ibm_db"
)

func Create_Con(con string) *sql.DB {
	db, err := sql.Open("go_ibm_db", con)
	if err != nil {
		fmt.Println(err)
		return nil
	}
	return db
}

// Creating a table.

func create(db *sql.DB) error {
	_, err := db.Exec("DROP table SAMPLE")
	if err != nil {
		_, err := db.Exec("create table SAMPLE(ID varchar(20),NAME varchar(20),LOCATION varchar(20),POSITION varchar(20))")
		if err != nil {
			return err
		}
	} else {
		_, err := db.Exec("create table SAMPLE(ID varchar(20),NAME varchar(20),LOCATION varchar(20),POSITION varchar(20))")
		if err != nil {
			return err
		}
	}
	fmt.Println("TABLE CREATED")
	return nil
}

// Inserting row.

func insert(db *sql.DB) error {
	st, err := db.Prepare("Insert into SAMPLE(ID,NAME,LOCATION,POSITION) values('3242','mike','hyd','manager')")
	if err != nil {
		return err
	}
	st.Query()
	return nil
}

// This api selects the data from the table and prints it.

func display(db *sql.DB) error {
	st, err := db.Prepare("select * from SAMPLE")
	if err != nil {
		return err
	}
	err = execquery(st)
	if err != nil {
		return err
	}
	return nil
}

func execquery(st *sql.Stmt) error {
	rows, err := st.Query()
	if err != nil {
		return err
	}
	cols, _ := rows.Columns()
	fmt.Printf("%s    %s   %s    %s\n", cols[0], cols[1], cols[2], cols[3])
	fmt.Println("-------------------------------------")
	defer rows.Close()
	for rows.Next() {
		var t, x, m, n string
		err = rows.Scan(&t, &x, &m, &n)
		if err != nil {
			return err
		}
		fmt.Printf("%v  %v   %v         %v\n", t, x, m, n)
	}
	return nil
}

func main() {
	con := "HOSTNAME=host;DATABASE=name;PORT=number;UID=username;PWD=password"
	type Db *sql.DB
	var re Db
	re = Create_Con(con)
	err := create(re)
	if err != nil {
		fmt.Println(err)
	}
	err = insert(re)
	if err != nil {
		fmt.Println(err)
	}
	err = display(re)
	if err != nil {
		fmt.Println(err)
	}
}

To run the sample:- go run example2.go

example3.go:-(POOLING)
package main

import (
	_ "database/sql"
	"fmt"
	a "github.com/ibmdb/go_ibm_db"
)

func main() {
	con := "HOSTNAME=host;PORT=number;DATABASE=name;UID=username;PWD=password"
	pool := a.Pconnect("PoolSize=100")

	// SetConnMaxLifetime will take the value in SECONDS
	db := pool.Open(con, "SetConnMaxLifetime=30")
	st, err := db.Prepare("Insert into SAMPLE values('hi','hi','hi','hi')")
	if err != nil {
		fmt.Println(err)
	}
	st.Query()

	// Here the the time out is default.
	db1 := pool.Open(con)
	st1, err := db1.Prepare("Insert into SAMPLE values('hi1','hi1','hi1','hi1')")
	if err != nil {
		fmt.Println(err)
	}
	st1.Query()

	db1.Close()
	db.Close()
	pool.Release()
	fmt.println("success")
}

To run the sample:- go run example3.go

For Running the Tests:

  1. Put your connection string in the main.go file in testdata folder

  2. Now run go test command (use go test -v command for details)

Documentation

Overview

Package odbc implements database/sql driver to access data via odbc interface.

Index

Constants

This section is empty.

Variables

View Source
var ConnMaxLifetime, PoolSize int
View Source
var Psize int

Psize sets the size of the pool idf value is passed

Functions

func ConvertAssign added in v0.1.1

func ConvertAssign(dest, src interface{}) error

ConvertAssign function copies the database data to Dest field in stored procedure.

func CreateDb added in v0.3.0

func CreateDb(dbname string, connStr string, options ...string) (bool, error)

CreateDb function will take the db name and user details as parameters and create the database.

func DropDb added in v0.3.0

func DropDb(dbname string, connStr string) (bool, error)

DropDb function will take the db name and user details as parameters and drop the database.

func IsError

func IsError(ret api.SQLRETURN) bool

func NewError

func NewError(apiName string, handle interface{}) error

func SqltoCtype added in v0.1.1

func SqltoCtype(sqltype api.SQLSMALLINT) api.SQLSMALLINT

SqltoCtype function will convert the sql type to c type

func ToHandleAndType

func ToHandleAndType(handle interface{}) (h api.SQLHANDLE, ht api.SQLSMALLINT)

Types

type BaseColumn

type BaseColumn struct {
	CType api.SQLSMALLINT
	SType api.SQLSMALLINT
	// contains filtered or unexported fields
}

BaseColumn implements common column functionality.

func (*BaseColumn) Name

func (c *BaseColumn) Name() string

func (*BaseColumn) TypeScan added in v0.1.0

func (c *BaseColumn) TypeScan() reflect.Type

func (*BaseColumn) Value

func (c *BaseColumn) Value(buf []byte) (driver.Value, error)

type BindableColumn

type BindableColumn struct {
	*BaseColumn
	IsBound         bool
	IsVariableWidth bool
	Size            int
	Len             BufferLen
	Buffer          []byte
	// contains filtered or unexported fields
}

BindableColumn allows access to columns that can have their buffers bound. Once bound at start, they are written to by odbc driver every time it fetches new row. This saves on syscall and, perhaps, some buffer copying. BindableColumn can be left unbound, then it behaves like NonBindableColumn when user reads data from it.

func NewBindableColumn

func NewBindableColumn(b *BaseColumn, ctype api.SQLSMALLINT, bufSize int) *BindableColumn

func (*BindableColumn) Bind

func (c *BindableColumn) Bind(h api.SQLHSTMT, idx int) (bool, error)

func (*BindableColumn) Value

func (c *BindableColumn) Value(h api.SQLHSTMT, idx int) (driver.Value, error)

type BufferLen

type BufferLen api.SQLLEN

func (*BufferLen) Bind

func (l *BufferLen) Bind(h api.SQLHSTMT, idx int, ctype api.SQLSMALLINT, buf []byte) api.SQLRETURN

func (*BufferLen) GetData

func (l *BufferLen) GetData(h api.SQLHSTMT, idx int, ctype api.SQLSMALLINT, buf []byte) api.SQLRETURN

func (*BufferLen) IsNull

func (l *BufferLen) IsNull() bool

type Column

type Column interface {
	Name() string
	TypeScan() reflect.Type
	Bind(h api.SQLHSTMT, idx int) (bool, error)
	Value(h api.SQLHSTMT, idx int) (driver.Value, error)
}

Column provides access to row columns.

func NewColumn

func NewColumn(h api.SQLHSTMT, idx int) (Column, error)

func NewVariableWidthColumn

func NewVariableWidthColumn(b *BaseColumn, ctype api.SQLSMALLINT, colWidth api.SQLULEN) Column

type Conn

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

func (*Conn) Begin

func (c *Conn) Begin() (driver.Tx, error)

func (*Conn) Close

func (c *Conn) Close() error

func (*Conn) Prepare

func (c *Conn) Prepare(query string) (driver.Stmt, error)

func (*Conn) PrepareODBCStmt

func (c *Conn) PrepareODBCStmt(query string) (*ODBCStmt, error)

func (*Conn) Query added in v0.3.0

func (c *Conn) Query(query string, args []driver.Value) (driver.Rows, error)

Query method executes the statement with out prepare if no args provided, and a driver.ErrSkip otherwise (handled by sql.go to execute usual preparedStmt)

type DBP

type DBP struct {
	sql.DB
	// contains filtered or unexported fields
}

DBP struct type contains the timeout, dbinstance and connection string

func (*DBP) Close

func (d *DBP) Close()

Close will make the connection available for the next release

func (*DBP) Timeout

func (d *DBP) Timeout()

Timeout for closing the connection in pool

type DiagRecord

type DiagRecord struct {
	State       string
	NativeError int
	Message     string
}

func (*DiagRecord) String

func (r *DiagRecord) String() string

type Driver

type Driver struct {
	Stats
	// contains filtered or unexported fields
}

func (*Driver) Close

func (d *Driver) Close() error

func (*Driver) Open

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

type Error

type Error struct {
	APIName string
	Diag    []DiagRecord
}

func (*Error) Error

func (e *Error) Error() string

type NonBindableColumn

type NonBindableColumn struct {
	*BaseColumn
}

NonBindableColumn provide access to columns, that can't be bound. These are of character or binary type, and, usually, there is no limit for their width.

func (*NonBindableColumn) Bind

func (c *NonBindableColumn) Bind(h api.SQLHSTMT, idx int) (bool, error)

func (*NonBindableColumn) Value

func (c *NonBindableColumn) Value(h api.SQLHSTMT, idx int) (driver.Value, error)

type ODBCStmt

type ODBCStmt struct {
	Parameters []Parameter
	Cols       []Column
	// contains filtered or unexported fields
}

func (*ODBCStmt) BindColumns

func (s *ODBCStmt) BindColumns() error

func (*ODBCStmt) Exec

func (s *ODBCStmt) Exec(args []driver.Value) error

type Out added in v0.1.1

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

Out struct is used to store the value of a OUT parameter in Stored Procedure

func (*Out) ConvertAssign added in v0.1.1

func (o *Out) ConvertAssign() error

ConvertAssign function copies the database data to Dest field in stored procedure.

func (*Out) Value added in v0.1.1

func (o *Out) Value() (driver.Value, error)

Value function converts the database value to driver.value

type Parameter

type Parameter struct {
	SQLType api.SQLSMALLINT
	Decimal api.SQLSMALLINT
	Size    api.SQLULEN

	// Following fields store data used later by SQLExecute.
	// The fields keep data alive and away from gc.
	Data             interface{}
	StrLen_or_IndPtr api.SQLLEN
	Outs             []*Out
	// contains filtered or unexported fields
}

func ExtractParameters

func ExtractParameters(h api.SQLHSTMT) ([]Parameter, error)

ExtractParameters will describe all the parameters

func (*Parameter) BindValue

func (p *Parameter) BindValue(h api.SQLHSTMT, idx int, v driver.Value) error

func (*Parameter) StoreStrLen_or_IndPtr

func (p *Parameter) StoreStrLen_or_IndPtr(v api.SQLLEN) *api.SQLLEN

StoreStrLen_or_IndPtr stores v into StrLen_or_IndPtr field of p and returns address of that field.

type Pool

type Pool struct {
	PoolSize int
	// contains filtered or unexported fields
}

Pool struct contais the about the pool like size, used and available connections

func Pconnect

func Pconnect(PoolSize string) *Pool

Pconnect will return the pool instance

func (*Pool) Display

func (p *Pool) Display()

Display will print the values in the map

func (*Pool) Open

func (p *Pool) Open(Connstr string, options ...string) *DBP

Open will check for the connection in the pool If not opens a new connection and stores in the pool

func (*Pool) Release

func (p *Pool) Release()

Release will close all the connections in the pool

type Result

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

func (*Result) LastInsertId

func (r *Result) LastInsertId() (int64, error)

func (*Result) RowsAffected

func (r *Result) RowsAffected() (int64, error)

type Rows

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

func (*Rows) Close

func (r *Rows) Close() error

func (*Rows) ColumnTypeDatabaseTypeName added in v0.1.0

func (r *Rows) ColumnTypeDatabaseTypeName(index int) string

func (*Rows) ColumnTypeLength added in v0.1.0

func (r *Rows) ColumnTypeLength(index int) (length int64, ok bool)

func (*Rows) ColumnTypeNullable added in v0.1.0

func (r *Rows) ColumnTypeNullable(index int) (nullable, ok bool)

func (*Rows) ColumnTypePrecisionScale added in v0.1.0

func (r *Rows) ColumnTypePrecisionScale(index int) (precision, scale int64, ok bool)

func (*Rows) ColumnTypeScanType added in v0.1.0

func (r *Rows) ColumnTypeScanType(index int) reflect.Type

func (*Rows) Columns

func (r *Rows) Columns() []string

func (*Rows) HasNextResultSet added in v0.1.0

func (r *Rows) HasNextResultSet() bool

func (*Rows) Next

func (r *Rows) Next(dest []driver.Value) error

func (*Rows) NextResultSet added in v0.1.0

func (r *Rows) NextResultSet() error

type Stats

type Stats struct {
	EnvCount  int
	ConnCount int
	StmtCount int
	// contains filtered or unexported fields
}

type Stmt

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

func (*Stmt) CheckNamedValue added in v0.1.1

func (s *Stmt) CheckNamedValue(nv *driver.NamedValue) (err error)

CheckNamedValue implementes driver.NamedValueChecker.

func (*Stmt) Close

func (s *Stmt) Close() error

Close closes the opened statement

func (*Stmt) Exec

func (s *Stmt) Exec(args []driver.Value) (driver.Result, error)

Exec executes the the sql but does not return the rows

func (*Stmt) NumInput

func (s *Stmt) NumInput() int

func (*Stmt) Query

func (s *Stmt) Query(args []driver.Value) (driver.Rows, error)

Query function executes the sql and return rows if rows are present

type Tx

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

func (*Tx) Commit

func (tx *Tx) Commit() error

func (*Tx) Rollback

func (tx *Tx) Rollback() error

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