org.apache.flink.connector.jdbc.dialect

类 AbstractDialect

java.lang.Object

org.apache.flink.connector.jdbc.dialect.AbstractDialect

所有已实现的接口:

Serializable, JdbcDialect

直接已知子类:

MySqlDialect, PostgresDialect

@PublicEvolving
public abstract class AbstractDialect
extends Object
implements JdbcDialect

Base class for JdbcDialects that implements basic data type validation and the construction of basic INSERT, UPDATE, DELETE, and SELECT statements.

Implementors should be careful to check the default SQL statements are performant for their specific dialect and override them if necessary.

另请参阅:

序列化表格

嵌套类概要

嵌套类

限定符和类型	类和说明
static class	AbstractDialect.Range A range from [min,max] where min <= max.

构造器概要

构造器

构造器和说明
AbstractDialect()

方法概要

限定符和类型	方法和说明
Optional<AbstractDialect.Range>	decimalPrecisionRange()
String	getDeleteStatement(String tableName, String[] conditionFields) A simple single row DELETE statement.
String	getInsertIntoStatement(String tableName, String[] fieldNames) A simple INSERT INTO statement.
String	getRowExistsStatement(String tableName, String[] conditionFields) A simple SELECT statement that checks for the existence of a single row.
String	getSelectFromStatement(String tableName, String[] selectFields, String[] conditionFields) A simple SELECT statement.
String	getUpdateStatement(String tableName, String[] fieldNames, String[] conditionFields) A simple single row UPDATE statement.
abstract Set<org.apache.flink.table.types.logical.LogicalTypeRoot>	supportedTypes() Defines the set of supported types for the dialect.
Optional<AbstractDialect.Range>	timestampPrecisionRange()
void	validate(org.apache.flink.table.types.logical.RowType rowType) Check if this dialect instance support a specific data type in table schema.

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

从接口继承的方法 org.apache.flink.connector.jdbc.dialect.JdbcDialect

appendDefaultUrlProperties, defaultDriverName, dialectName, getLimitClause, getRowConverter, getUpsertStatement, quoteIdentifier

构造器详细资料

AbstractDialect

public AbstractDialect()

方法详细资料

validate

public void validate(org.apache.flink.table.types.logical.RowType rowType)
              throws org.apache.flink.table.api.ValidationException

从接口复制的说明: JdbcDialect

Check if this dialect instance support a specific data type in table schema.

指定者:

validate 在接口中 JdbcDialect

参数:

rowType - the physical table datatype of a row in the database table.

抛出:

org.apache.flink.table.api.ValidationException - in case of the table schema contains unsupported type.

getInsertIntoStatement

public String getInsertIntoStatement(String tableName,
                                     String[] fieldNames)

A simple INSERT INTO statement.

 INSERT INTO table_name (column_name [, ...])
 VALUES (value [, ...])
 

指定者:

getInsertIntoStatement 在接口中 JdbcDialect

返回:

the dialects INSERT INTO statement.

getUpdateStatement

public String getUpdateStatement(String tableName,
                                 String[] fieldNames,
                                 String[] conditionFields)

A simple single row UPDATE statement.

 UPDATE table_name
 SET col = val [, ...]
 WHERE cond [AND ...]
 

指定者:

getUpdateStatement 在接口中 JdbcDialect

返回:

A single row update statement.

getDeleteStatement

public String getDeleteStatement(String tableName,
                                 String[] conditionFields)

A simple single row DELETE statement.

 DELETE FROM table_name
 WHERE cond [AND ...]
 

指定者:

getDeleteStatement 在接口中 JdbcDialect

返回:

A single row delete statement.

getSelectFromStatement

public String getSelectFromStatement(String tableName,
                                     String[] selectFields,
                                     String[] conditionFields)

A simple SELECT statement.

 SELECT expression [, ...]
 FROM table_name
 WHERE cond [AND ...]
 

指定者:

getSelectFromStatement 在接口中 JdbcDialect

返回:

A select statement.

getRowExistsStatement

public String getRowExistsStatement(String tableName,
                                    String[] conditionFields)

A simple SELECT statement that checks for the existence of a single row.

 SELECT 1
 FROM table_name
 WHERE cond [AND ...]
 

指定者:

getRowExistsStatement 在接口中 JdbcDialect

timestampPrecisionRange

public Optional<AbstractDialect.Range> timestampPrecisionRange()

返回:

The inclusive range [min,max] of supported precisions for TimestampType columns. None if timestamp type is not supported.

decimalPrecisionRange

public Optional<AbstractDialect.Range> decimalPrecisionRange()

返回:

The inclusive range [min,max] of supported precisions for DecimalType columns. None if decimal type is not supported.

supportedTypes

public abstract Set<org.apache.flink.table.types.logical.LogicalTypeRoot> supportedTypes()

Defines the set of supported types for the dialect. If the dialect supports DECIMAL or TIMESTAMP types, be sure to override decimalPrecisionRange() and timestampPrecisionRange() respectively.

返回:

a set of logical type roots.