Package org.h2.samples

Class TriggerPassData

  • All Implemented Interfaces:
    Trigger
    public class TriggerPassData
extends java.lang.Object
implements Trigger
    This sample application shows how to pass data to a trigger. Trigger data can be persisted by storing it in the database.

    • Constructor Summary

      Constructors 
      Constructor Description
      TriggerPassData()  

    • Method Summary

      All Methods Static Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      void fire​(java.sql.Connection conn, java.lang.Object[] old, java.lang.Object[] row)
      This method is called for each triggered action.
      void init​(java.sql.Connection conn, java.lang.String schemaName, java.lang.String triggerName, java.lang.String tableName, boolean before, int type)
      This method is called by the database engine once when initializing the trigger.
      static void main​(java.lang.String... args)
      This method is called when executing this sample application from the command line.
      static void setTriggerData​(java.sql.Connection conn, java.lang.String trigger, java.lang.String data)
      Call this method to change a specific trigger.

      • Methods inherited from class java.lang.Object

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

    • Constructor Detail

      • TriggerPassData

        public TriggerPassData()

    • Method Detail

      • main

        public static void main​(java.lang.String... args)
                 throws java.lang.Exception
        This method is called when executing this sample application from the command line.
        Parameters:
        args - the command line parameters
        Throws:
        java.lang.Exception - on failure

      • init

        public void init​(java.sql.Connection conn,
                 java.lang.String schemaName,
                 java.lang.String triggerName,
                 java.lang.String tableName,
                 boolean before,
                 int type)
          throws java.sql.SQLException
        Description copied from interface: Trigger
        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 type of operation is a bit field with the appropriate flags set. As an example, if the trigger is of type INSERT and UPDATE, then the parameter type is set to (INSERT | UPDATE).
        Specified by:
        init in interface Trigger
        Parameters:
        conn - a connection to the database (a system connection)
        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)
        Throws:
        java.sql.SQLException - on SQL exception

      • fire

        public void fire​(java.sql.Connection conn,
                 java.lang.Object[] old,
                 java.lang.Object[] row)
        Description copied from interface: 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.

        Specified by:
        fire in interface Trigger
        Parameters:
        conn - a connection to the database
        old - the old row, or null if no old row is available (for INSERT)
        row - the new row, or null if no new row is available (for DELETE)

      • setTriggerData

        public static void setTriggerData​(java.sql.Connection conn,
                                  java.lang.String trigger,
                                  java.lang.String data)
                           throws java.sql.SQLException
        Call this method to change a specific trigger.
        Parameters:
        conn - the connection
        trigger - the trigger name
        data - the data
        Throws:
        java.sql.SQLException - on failure