org.h2.tools

类 TriggerAdapter

java.lang.Object

org.h2.tools.TriggerAdapter

所有已实现的接口:

Trigger

public abstract class TriggerAdapter
extends Object
implements Trigger

An adapter for the trigger interface that allows to use the ResultSet interface instead of a row array.

字段概要

字段

限定符和类型	字段和说明
protected boolean	before Whether the fire method is called before or after the operation is performed.
protected String	schemaName The schema name.
protected String	tableName The name of the table.
protected String	triggerName The name of the trigger.
protected int	type The trigger type: INSERT, UPDATE, DELETE, SELECT, or a combination (a bit field).

从接口继承的字段 org.h2.api.Trigger

DELETE, INSERT, SELECT, UPDATE

构造器概要

构造器

构造器和说明
TriggerAdapter()

方法概要

限定符和类型	方法和说明
void	fire(Connection conn, Object[] oldRow, Object[] newRow) This method is called for each triggered action.
abstract void	fire(Connection conn, ResultSet oldRow, ResultSet newRow) This method is called for each triggered action by the default fire(Connection conn, Object[] oldRow, Object[] newRow) method.
void	init(Connection conn, String schemaName, String triggerName, String tableName, boolean before, int type) This method is called by the database engine once when initializing the trigger.

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.h2.api.Trigger

close, remove

字段详细资料

schemaName

protected String schemaName

The schema name.

triggerName

protected String triggerName

The name of the trigger.

tableName

protected String tableName

The name of the table.

before

protected boolean before

Whether the fire method is called before or after the operation is performed.

type

protected int type

The trigger type: INSERT, UPDATE, DELETE, SELECT, or a combination (a bit field).

构造器详细资料

TriggerAdapter

public TriggerAdapter()

方法详细资料

init

public void init(Connection conn,
                 String schemaName,
                 String triggerName,
                 String tableName,
                 boolean before,
                 int type)
          throws SQLException

This method is called by the database engine once when initializing the trigger. It is called when the trigger is created, as well as when the database is opened. The default implementation initialized the result sets.

指定者:

init 在接口中 Trigger

参数:

conn - a connection to the database

schemaName - the name of the schema

triggerName - the name of the trigger used in the CREATE TRIGGER statement

tableName - the name of the table

before - whether the fire method is called before or after the operation is performed

type - the operation type: INSERT, UPDATE, DELETE, SELECT, or a combination (this parameter is a bit field)

抛出:

SQLException - on SQL exception

fire

public final void fire(Connection conn,
                       Object[] oldRow,
                       Object[] newRow)
                throws SQLException

从接口复制的说明: Trigger

This method is called for each triggered action. The method is called immediately when the operation occurred (before it is committed). A transaction rollback will also rollback the operations that were done within the trigger, if the operations occurred within the same database. If the trigger changes state outside the database, a rollback trigger should be used.

The row arrays contain all columns of the table, in the same order as defined in the table.

The trigger itself may change the data in the newRow array.

指定者:

fire 在接口中 Trigger

参数:

conn - a connection to the database

oldRow - the old row, or null if no old row is available (for INSERT)

newRow - the new row, or null if no new row is available (for DELETE)

抛出:

SQLException - if the operation must be undone

fire

public abstract void fire(Connection conn,
                          ResultSet oldRow,
                          ResultSet newRow)
                   throws SQLException

This method is called for each triggered action by the default fire(Connection conn, Object[] oldRow, Object[] newRow) method.

For "before" triggers, the new values of the new row may be changed using the ResultSet.updateX methods.

参数:

conn - a connection to the database

oldRow - the old row, or null if no old row is available (for INSERT)

newRow - the new row, or null if no new row is available (for DELETE)

抛出:

SQLException - if the operation must be undone