database

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README

Guide for Developers of Database Storage

Database storage is a framework for database queries and SQL execution, serving as an abstraction for databases. Its underlying implementation relies on the database/sql interface of the Golang standard library.

Introduction to Database Storage

Database storage facilitates the querying and execution of SQL through the encapsulation of the database/sql DB struct from the Golang standard library. The db.go file provides a rich set of methods, including not only the original methods of the database/sql DB such as BeginTx, PingContext, QueryContext, and ExecContext but also FetchTable and FetchTableWithParam for retrieving table structures, FetchRecord and FetchRecordWithTx for fetching records from a table, and BatchExec, BatchExecWithTx, and BatchExecStmtWithTx for executing write operations.

However, for different databases, the implementation of database storage can vary based on the specific database dialect. This document will introduce how to implement the database dialect interface.

Introduction to the Database Dialect Interface

The prerequisite for implementing the dialect interface is that the corresponding database driver can implement the database/sql interface of the Golang standard library.

When implementing specifically, you can refer to the following directory structure. Here, MySQL is used as an example:

storage--database--mysql----+--config.go        
                            |--doc.go
                            |--field.go
                            |--source.go
                            |--table.go

Using this approach, we have currently implemented support for MySQL, PostgreSQL, and DB2.

Data Source Interface
// Dialect represents a database dialect.
type Dialect interface {
 Source(*BaseSource) (Source, error) // Data source
}

// Source represents a data source, including driver information, package information, configuration files, and connection information.
type Source interface {
 Config() *config.JSON   // Configuration information
 Key() string            // Generally, the connection information
 DriverName() string     // Driver name, used as the 1st parameter for sql.Open
 ConnectName() string    // Connection information, used as the 2nd parameter for sql.Open
 Table(*BaseTable) Table // Get the specific table structure interface
}

When implementing the Source interface, you can combine BaseSource to simplify the implementation. The Table method should return the specific table structure interface. Refer to the implementation in source.go of the MySQL package.

Additionally, the connection information relies on the configuration provided by Config. Currently, Config needs to be defined as follows to be compatible with the dbms package for implementing DataX plugins. Refer to the implementation in config.go of the MySQL package.

type Config struct {
 URL      string `json:"url"`      // Database URL, including database address and other parameters
 Username string `json:"username"` // Username
 Password string `json:"password"` // Password
}

Furthermore, you need to use the init function to register the specific dialect:

func init() {
 var d Dialect
 database.RegisterDialect(d.Name(), d)
}
Table Structure Interface
// Table represents a table structure.
type Table interface {
 fmt.Stringer

 Quoted() string   // Fully qualified quoted table name
 Instance() string // Instance name, e.g., database for MySQL
 Schema() string   // Schema name, e.g., username (schema name) for Oracle
 Name() string     // Table name, e.g., table for MySQL
 Fields() []Field  // Displays all columns
}

// FieldsFetcher is a supplementary interface for Table, used to specifically fetch all columns.
type FieldsFetcher interface {
 FetchFields(ctx context.Context, db *DB) error // Retrieves the specific columns
}

// FieldAdder is a supplementary interface for Table, used to add new columns to the table.
type FieldAdder interface {
 AddField(*BaseField) // Adds a specific column
}

// ExecParameter is a supplementary interface for Table, used to generate SQL statements for write operations.
type ExecParameter interface {
 ExecParam(string, *sql.TxOptions) (Parameter, bool)
}

When implementing the Table interface, you can combine BaseTable to simplify the implementation. The Fields method must return a collection of specific field interfaces for the corresponding database. Refer to the implementation in table.go of the MySQL package.

You can choose to implement either FetchFields or FieldAdder, but generally, FieldAdder is preferred. ExecParameter can be used to implement SQL statements for bulk inserts. For example, for MySQL, you can implement the replace into method for insertion. Currently, a universally applicable insert method is implemented by default, but for cases like using the gora driver for Oracle, the insert method may not be suitable.

// Parameter represents an execution parameter with a table, transaction mode, and SQL statement.
type Parameter interface {
 Table() Table                                 // Table or view
 TxOptions() *sql.TxOptions                    // Transaction mode
 Query([]element.Record) (string, error)       // SQL prepare statement
 Agrs([]element.Record) ([]interface{}, error) // Prepare parameters
}

To implement the replace into method for insertion, you need to implement the Parameter interface. You can combine BaseParam to simplify the implementation. Refer to the implementation in table.go of the MySQL package.

Field Interface
// Field represents a database column.
type Field interface {
 fmt.Stringer

 Index() int                   // Index
 Name() string                 // Column name
 Quoted() string               // Quoted column name
 BindVar(int) string           // Placeholder symbol
 Select() string               // Select column name
 Type() FieldType              // Column type
 Scanner() Scanner             // Scanner, used to convert database data into a column
 Valuer(element.Column) Valuer // Valuer, used to convert a column into database data
}

When implementing the Field interface, you can combine BaseField to simplify the implementation. The Type() method must return the specific column type for the corresponding database. The Scanner must return the scanner for the corresponding database, and the Valuer must return the valuer for the corresponding database. Refer to the implementation in field.go of the MySQL package.

// ColumnType represents a column type, abstracting `sql.ColumnType` and facilitating the implementation of corresponding functions.
type ColumnType interface {
 Name() string                                   // Column name
 ScanType() reflect.Type                         // Scan type
 Length() (length int64, ok bool)                // Length
 DecimalSize() (precision, scale int64, ok bool) // Precision
 Nullable() (nullable, ok bool)                  // Nullability
 DatabaseTypeName() string                       // Database type name
}

// FieldType represents a field type.
type FieldType interface {
 ColumnType

 IsSupportted() bool // Checks if the type is supported
}

When implementing the FieldType interface, you can combine BaseFieldType to simplify the implementation. ColumnType is essentially an abstraction of sql.ColumnType. Refer to the implementation in field.go of the MySQL package.

// Scanner represents a column data scanner that converts database driver values into column data.
type Scanner interface {
 sql.Scanner

 Column() element.Column // Gets the column data
}

When implementing the Scanner interface, you can combine BaseFieldType to simplify the implementation. The role of the scanner is to convert the data read by the database driver into a single column of data. Refer to the implementation in field.go of the MySQL package.

// Valuer represents a valuer that converts corresponding data into a value for the database driver.
type Valuer interface {
 driver.Valuer
}

// ValuerGoType is an optional functionality for the Field, used to determine the Go type for the corresponding driver value.
// It returns the corresponding value for the driver's value, facilitating the determination by GoValuer.
type ValuerGoType interface {
 GoType() GoType
}

When implementing the Valuer interface, you can combine GoValuer to simplify the implementation. To use GoValuer, you need to implement the ValuerGoType interface at the database layer's Field level. The role of the valuer is to convert a single column of data into the data type used for writing by the database driver. Refer to the implementation in field.go of the MySQL package.

Documentation

Overview

Package database Packages the database that implements the interface of the standard library database/sql

Index

Constants

View Source 
const (
	DefaultMaxOpenConns = 4
	DefaultMaxIdleConns = 4
)

Default Parameters

View Source 
const (
	WriteModeInsert = "insert"
)

Write to Database Schema

Variables

View Source 
var (
	ErrNotValuerGoType = errors.New("field type is not ValuerGoType") // Error indicating that the interface is not a ValuerGoType.
)

Related to field errors.

Functions

func RegisterDialect 

func RegisterDialect(name string, dialect Dialect)

RegisterDialect Registers a database dialect. A panic occurs when the registered name is the same or the dialect is empty.

func UnregisterAllDialects 

func UnregisterAllDialects()

UnregisterAllDialects Unregisters all database dialects.

Types

type BaseConfig added in v0.1.8 

type BaseConfig struct {
	TrimChar bool `json:"trimChar"`
}

BaseConfig is the configuration for the base table

type BaseConfigSetter added in v0.1.8 

type BaseConfigSetter struct {
	BaseConfig
	// contains filtered or unexported fields
}

BaseConfigSetter is the setter for the base table configuration

func (*BaseConfigSetter) Config added in v0.1.8 

func (b *BaseConfigSetter) Config() *config.JSON

Config retrieves the table configuration

func (*BaseConfigSetter) SetConfig added in v0.1.8 

func (b *BaseConfigSetter) SetConfig(conf *config.JSON)

SetConfig sets the table configuration

func (*BaseConfigSetter) TrimByteChar added in v0.1.8 

func (b *BaseConfigSetter) TrimByteChar(char []byte) []byte

TrimByteChar removes leading and trailing spaces from a byte array character

func (*BaseConfigSetter) TrimStringChar added in v0.1.8 

func (b *BaseConfigSetter) TrimStringChar(char string) string

TrimStringChar removes leading and trailing spaces from a string character

type BaseFetchHandler 

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

BaseFetchHandler Basic Record Handler Acquisition

func NewBaseFetchHandler 

func NewBaseFetchHandler(createRecord func() (element.Record, error),
	onRecord func(element.Record) error) *BaseFetchHandler

NewBaseFetchHandler Create Basic Record Handler

func (*BaseFetchHandler) CreateRecord 

func (b *BaseFetchHandler) CreateRecord() (element.Record, error)

CreateRecord Create a Record

func (*BaseFetchHandler) OnRecord 

func (b *BaseFetchHandler) OnRecord(r element.Record) error

OnRecord Process Record r

type BaseField 

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

BaseField: Represents a basic field, primarily storing the column name and column type.

func NewBaseField 

func NewBaseField(index int, name string, fieldType FieldType) *BaseField

NewBaseField: Creates a new base field based on the column name and column type. Used for embedding other Fields, facilitating the implementation of database-specific Fields.

func (*BaseField) FieldType 

func (b *BaseField) FieldType() FieldType

FieldType: Returns the field type.

func (*BaseField) Index 

func (b *BaseField) Index() int

Index: Returns the field name.

func (*BaseField) Name 

func (b *BaseField) Name() string

Name: Returns the field name.

func (*BaseField) String 

func (b *BaseField) String() string

String: Displays a string representation when printing.

type BaseFieldType 

type BaseFieldType struct {
	ColumnType
}

BaseFieldType: Represents the basic type of a field, embedding implementations for various database field types.

func NewBaseFieldType 

func NewBaseFieldType(typ ColumnType) *BaseFieldType

NewBaseFieldType: Gets the field type.

func (*BaseFieldType) IsSupported added in v0.1.8 

func (*BaseFieldType) IsSupported() bool

IsSupported: Determines if it is supported for parsing.

type BaseParam 

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

BaseParam Basic parameters, used to embed SQL parameters for various databases

func NewBaseParam 

func NewBaseParam(table Table, txOpts *sql.TxOptions) *BaseParam

NewBaseParam Generate basic parameters through table and transaction parameters txOps

func (*BaseParam) SetTable added in v0.1.4 

func (b *BaseParam) SetTable(table Table)

SetTable Set table

func (*BaseParam) Table 

func (b *BaseParam) Table() Table

Table Get table

func (*BaseParam) TxOptions 

func (b *BaseParam) TxOptions() *sql.TxOptions

TxOptions Get transaction parameters

type BaseScanner 

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

BaseScanner: Represents a basic scanner, embedding implementations for various database scanners.

func (*BaseScanner) Column 

func (b *BaseScanner) Column() element.Column

Column: Retrieves the column value, facilitating a unified way to obtain column values.

func (*BaseScanner) SetColumn 

func (b *BaseScanner) SetColumn(c element.Column)

SetColumn: Sets the column value for database-specific column data settings.

type BaseSource 

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

BaseSource Basic data source for storing JSON configuration files Used to embed Source, facilitating the implementation of various database Fields

func NewBaseSource 

func NewBaseSource(conf *config.JSON) *BaseSource

NewBaseSource Generate a basic data source from the JSON configuration file conf

func (*BaseSource) Config 

func (b *BaseSource) Config() *config.JSON

Config Configuration file for the basic data source

type BaseTable 

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

BaseTable Basic table, used to embed implementations of various database tables

func NewBaseTable 

func NewBaseTable(instance, schema, name string) *BaseTable

NewBaseTable, acquire the basic table through instance name, schema name, and table name

func (*BaseTable) AppendField 

func (b *BaseTable) AppendField(f Field)

AppendField Append column

func (*BaseTable) Fields 

func (b *BaseTable) Fields() []Field

Fields Show all columns

func (*BaseTable) Instance 

func (b *BaseTable) Instance() string

Instance Instance name, e.g., for MySQL, it's the database name; for Oracle, it's the instance name

func (*BaseTable) Name 

func (b *BaseTable) Name() string

Name Table name, e.g., for MySQL, it's the table name

func (*BaseTable) Schema 

func (b *BaseTable) Schema() string

Schema Schema name, e.g., for MySQL, it's the database name; for Oracle, it's the username

func (*BaseTable) String 

func (b *BaseTable) String() string

String Display string for printing

type ColumnType 

type ColumnType interface {
	Name() string                                   // Column name.
	ScanType() reflect.Type                         // Scanning type.
	Length() (length int64, ok bool)                // Length.
	DecimalSize() (precision, scale int64, ok bool) // Precision.
	Nullable() (nullable, ok bool)                  // Whether it is nullable.
	DatabaseTypeName() string                       // Name of the column's database type.
}

ColumnType: Represents the type of a column, abstracting sql.ColumnType and facilitating custom implementations.

type Config 

type Config struct {
	Pool PoolConfig `json:"pool"`
}

Config is the basic configuration for database connections, typically used for sql.DB configurations

func NewConfig 

func NewConfig(conf *config.JSON) (c *Config, err error)

NewConfig retrieves the database connection configuration 'c' from a JSON configuration 'err' refers to an error where the JSON configuration cannot be converted into a database connection configuration

type ConfigSetter added in v0.1.8 

type ConfigSetter interface {
	SetConfig(conf *config.JSON)
}

ConfigSetter is an additional method for Table, used to set the JSON configuration file

type DB 

type DB struct {
	Source
	// contains filtered or unexported fields
}

DB User Maintains Database Connection Pool

func NewDB 

func NewDB(source Source) (d *DB, err error)

NewDB Acquire Database Connection Pool from Data Source source

func (*DB) BatchExec 

func (d *DB) BatchExec(ctx context.Context, opts *ParameterOptions) (err error)

BatchExec Execute Multiple SQL Statements in Batch and Process Multiple Records

func (*DB) BatchExecStmt 

func (d *DB) BatchExecStmt(ctx context.Context, opts *ParameterOptions) (err error)

BatchExecStmt Batch Prepare/Execute Multiple SQL Statements and Process Multiple Records

func (*DB) BatchExecStmtWithTx 

func (d *DB) BatchExecStmtWithTx(ctx context.Context, opts *ParameterOptions) (err error)

BatchExecStmtWithTx Batch Transaction Prepare/Execute Multiple SQL Statements and Process Multiple Records

func (*DB) BatchExecWithTx 

func (d *DB) BatchExecWithTx(ctx context.Context, opts *ParameterOptions) (err error)

BatchExecWithTx Execute Multiple SQL Statements in Batch Using Transaction and Process Multiple Records

func (*DB) BeginTx 

func (d *DB) BeginTx(ctx context.Context, opts *sql.TxOptions) (*sql.Tx, error)

BeginTx Acquire Transaction

func (*DB) Close 

func (d *DB) Close() (err error)

Close Close the Data Connection Pool

func (*DB) ExecContext 

func (d *DB) ExecContext(ctx context.Context, query string, args ...interface{}) (sql.Result, error)

ExecContext Execute Query and Acquire Result

func (*DB) FetchRecord 

func (d *DB) FetchRecord(ctx context.Context, param Parameter, handler FetchHandler) (err error)

FetchRecord Acquire Multiple Rows of Records through Context ctx, SQL Parameter param, and Record Processing Function onRecord Returns an Error if Any

func (*DB) FetchRecordWithTx 

func (d *DB) FetchRecordWithTx(ctx context.Context, param Parameter, handler FetchHandler) (err error)

FetchRecordWithTx Acquire Multiple Rows of Records Using Transaction through Context ctx, SQL Parameter param, and Record Processing Function onRecord Returns an Error if Any

func (*DB) FetchTable 

func (d *DB) FetchTable(ctx context.Context, t *BaseTable) (Table, error)

FetchTable Acquire Corresponding Table through Context ctx and Basic Table Data t, Returns an Error if Any

func (*DB) FetchTableWithParam 

func (d *DB) FetchTableWithParam(ctx context.Context, param Parameter) (Table, error)

FetchTableWithParam Acquire Corresponding Table through Context ctx and SQL Parameter param, Returns an Error if Any

func (*DB) PingContext 

func (d *DB) PingContext(ctx context.Context) error

PingContext Query Multiple Rows of Data through Query

func (*DB) QueryContext 

func (d *DB) QueryContext(ctx context.Context, query string, args ...interface{}) (*sql.Rows, error)

QueryContext Query Multiple Rows of Data through Query

type DBWrapper 

type DBWrapper struct {
	*DB
	// contains filtered or unexported fields
}

DBWrapper is a wrapper for database connection pools, used to reuse relevant database connection pools (from unit to instance: user)

func Open 

func Open(name string, conf *config.JSON) (dw *DBWrapper, err error)

Open can acquire a reusable database connection pool wrapper through the database name and JSON configuration conf, similar to a smart pointer

func (*DBWrapper) Close 

func (d *DBWrapper) Close() (err error)

Close releases the database connection pool. If there are multiple references, the database connection pool will not be closed. When there are no references, it will be closed directly.

type Dialect 

type Dialect interface {
	Source(*BaseSource) (Source, error) // Data Source
}

Dialect Database Dialect

type ExecParameter 

type ExecParameter interface {
	ExecParam(string, *sql.TxOptions) (Parameter, bool)
}

ExecParameter Supplementary method for Table, used to get the method to generate SQL statements for write mode

type FetchHandler 

type FetchHandler interface {
	OnRecord(element.Record) error
	CreateRecord() (element.Record, error)
}

FetchHandler Acquire Record Handler

type Field 

type Field interface {
	fmt.Stringer

	Index() int                   // Index.
	Name() string                 // Field name.
	Quoted() string               // Referenced field name.
	BindVar(int) string           // Placeholder symbol, starting from 1.
	Select() string               // Selected field name.
	Type() FieldType              // Field type.
	Scanner() Scanner             // Scanner.
	Valuer(element.Column) Valuer // Valuer.
}

Field refers to a database field.

type FieldAdder 

type FieldAdder interface {
	AddField(*BaseField) // Add specific column
}

FieldAdder Supplementary method for Table, used to add columns to a table

type FieldType 

type FieldType interface {
	ColumnType

	IsSupported() bool // Whether it is supported.
}

FieldType: Represents the type of a field.

type FieldsFetcher 

type FieldsFetcher interface {
	FetchFields(ctx context.Context, db *DB) error // Get specific column
}

FieldsFetcher Supplementary method for Table, used to specially fetch all columns of a table

type GoType 

type GoType uint8

GoType refers to the type in the Golang language. 

const (
	GoTypeUnknown GoType = iota // Unknown type.
	GoTypeBool                  // Boolean type.
	GoTypeInt64                 // Int64 type.
	GoTypeFloat64               // Float64 type.
	GoTypeString                // String type.
	GoTypeBytes                 // Byte stream type.
	GoTypeTime                  // Time type.
)

Enumeration of golang types.

func (GoType) String 

func (t GoType) String() string

String description of the enumeration of golang types.

type GoValuer 

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

GoValuer: Generates a Valuer using the GoType. Primarily done through the field 'f' and the incoming column value 'c'. Completes the generation of a Valuer using the GoType, facilitating the implementation of GoValuer.

func NewGoValuer 

func NewGoValuer(f Field, c element.Column) *GoValuer

NewGoValuer: Generates a new Valuer using the GoType, primarily done through the field 'f' and the incoming column value 'c'.

func (*GoValuer) Value 

func (g *GoValuer) Value() (driver.Value, error)

Value: Generates the corresponding driver-accepted value based on ValuerGoType.

type InsertParam 

type InsertParam struct {
	*BaseParam
}

InsertParam Insert parameters

func NewInsertParam 

func NewInsertParam(t Table, txOps *sql.TxOptions) *InsertParam

NewInsertParam Generate insert parameters through table and transaction parameters txOps

func (*InsertParam) Agrs 

func (i *InsertParam) Agrs(records []element.Record) (valuers []interface{}, err error)

Args Generate bulk insert parameters from multiple records

func (*InsertParam) Query 

func (i *InsertParam) Query(records []element.Record) (query string, err error)

Query Generate a bulk insert SQL statement from multiple records

type Judger 

type Judger interface {
	schedule.RetryJudger

	ShouldOneByOne(err error) bool
}

Judger Error evaluator

type Parameter 

type Parameter interface {
	SetTable(Table)                               // Set table or view
	Table() Table                                 // Table or view
	TxOptions() *sql.TxOptions                    // Transaction mode
	Query([]element.Record) (string, error)       // SQL prepare statement
	Agrs([]element.Record) ([]interface{}, error) // Prepare parameters
}

Parameter Execution parameters for SQL statements with table, transaction mode, and SQL

type ParameterOptions 

type ParameterOptions struct {
	Table     Table            // Table or view
	Mode      string           // Write mode, e.g., for MySQL
	TxOptions *sql.TxOptions   // Transaction mode
	Records   []element.Record // Write row
}

ParameterOptions Options for parameters

type PoolConfig 

type PoolConfig struct {
	MaxOpenConns    int            `json:"maxOpenConns"`    // Maximum number of open connections
	MaxIdleConns    int            `json:"maxIdleConns"`    // Maximum number of idle connections
	ConnMaxIdleTime time2.Duration `json:"connMaxIdleTime"` // Maximum idle time for connections
	ConnMaxLifetime time2.Duration `json:"connMaxLifetime"` // Maximum lifetime for connections
}

PoolConfig is the configuration for the database connection pool Generally, the maximum number of open connections should be the same as the maximum number of idle connections, otherwise it can lead to insufficient file resources due to unreleased connections

func (*PoolConfig) GetMaxIdleConns 

func (c *PoolConfig) GetMaxIdleConns() int

GetMaxIdleConns retrieves the maximum number of idle connections, with a default return value of 4

func (*PoolConfig) GetMaxOpenConns 

func (c *PoolConfig) GetMaxOpenConns() int

GetMaxOpenConns retrieves the maximum number of open connections, with a default return value of 4

type Scanner 

type Scanner interface {
	sql.Scanner

	Column() element.Column // Get column data.
}

Scanner: Data scanner for columns. Converts database driver values into column data.

type Source 

type Source interface {
	Config() *config.JSON   // Configuration Information
	Key() string            // Typically connection information
	DriverName() string     // Driver Name, used as the first parameter for sql.Open
	ConnectName() string    // Connection Information, used as the second parameter for sql.Open
	Table(*BaseTable) Table // Get Specific Table
}

Source Data Source, containing driver information, package information, configuration files, and connection information

func NewSource 

func NewSource(name string, conf *config.JSON) (source Source, err error)

NewSource Obtain the corresponding data source by the name of the database dialect

type Table 

type Table interface {
	fmt.Stringer

	Quoted() string   // Full name of the referenced table
	Instance() string // Instance name, e.g., for MySQL, it's the database name
	Schema() string   // Schema name, e.g., for Oracle, it's the username (schema name)
	Name() string     // Table name, e.g., for MySQL, it's the table name
	Fields() []Field  // Show all columns
}

Table Table structure

type TableQueryParam 

type TableQueryParam struct {
	*BaseParam
}

TableQueryParam Table structure query parameters

func NewTableQueryParam 

func NewTableQueryParam(table Table) *TableQueryParam

NewTableQueryParam Generate table structure query parameters from Table

func (*TableQueryParam) Agrs 

func (t *TableQueryParam) Agrs(_ []element.Record) (a []interface{}, err error)

Args Generate parameters, but they are empty

func (*TableQueryParam) Query 

func (t *TableQueryParam) Query(_ []element.Record) (s string, err error)

Query Generate a select * from table where 1=2 to acquire the table structure

type Valuer 

type Valuer interface {
	driver.Valuer
}

Valuer: Converts corresponding data into database driver values.

type ValuerGoType 

type ValuerGoType interface {
	GoType() GoType
}

type WithConnector 

type WithConnector interface {
	Connector() (driver.Connector, error) // go 1.10 Get Connection
}

WithConnector Data Source with Connection, the data source prefers to call this method to generate a data connection pool DB

Source Files

View all Source files

Directories

Path Synopsis
Package db2 implements the Dialect of db2 database, supporting the corresponding database of db2 9.x+
 Package db2 implements the Dialect of db2 database, supporting the corresponding database of db2 9.x+
Package mysql implements the Dialect of mysql database, supporting the corresponding database of mysql 5.7+
 Package mysql implements the Dialect of mysql database, supporting the corresponding database of mysql 5.7+
Package oracle implements the Dialect for Oracle databases, supporting Oracle 10.5+ corresponding databases.
 Package oracle implements the Dialect for Oracle databases, supporting Oracle 10.5+ corresponding databases.
Package postgres implements the Dialect for PostgreSQL databases, supporting PostgreSQL 8.0+ corresponding databases.
 Package postgres implements the Dialect for PostgreSQL databases, supporting PostgreSQL 8.0+ corresponding databases.
Package sqlserver implements the Dialect for SQL Server databases, supporting MSSQL 2005+ corresponding databases.
 Package sqlserver implements the Dialect for SQL Server databases, supporting MSSQL 2005+ corresponding databases.

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