Package org.hsqldb

Interface Trigger

  • All Known Implementing Classes:
    TriggerSample

    public interface Trigger
    The interface an HSQLDB TRIGGER must implement. The user-supplied class that implements this must have a default constructor.
    Since:
    1.7.0
    Author:
    Peter Hudson (peterhudson@users dot sourceforge.net)
    • Method Detail

      • fire

        void fire​(int type,
                  java.lang.String trigName,
                  java.lang.String tabName,
                  java.lang.Object[] oldRow,
                  java.lang.Object[] newRow)
        The method invoked upon each triggered action.

        type contains the integer index id for trigger type, e.g. TriggerDef.INSERT_AFTER

        For all triggers defined as default FOR EACH STATEMENT both oldRow and newRow are null.

        For triggers defined as FOR EACH ROW, the following will apply:

        When UPDATE triggers are fired, oldRow contains the existing values of the table row and newRow contains the new values.

        For INSERT triggers, oldRow is null and newRow contains the table row to be inserted. For DELETE triggers, newRow is null and oldRow contains the table row to be deleted.

        For error conditions, users can construct an HsqlException using one of the static methods of org.hsqldb.error.Error with a predefined SQL State from org.hsqldb.error.ErrorCode.

        Parameters:
        type - the type as one of the int values defined in the interface
        trigName - the name of the trigger
        tabName - the name of the table upon which the triggered action is occuring
        oldRow - the old row
        newRow - the new row
        Throws:
        org.hsqldb.HsqlException