GdaDictConstraint Represents a constraint within a database Any type of constraint in a database is represented by one instance of the class (see the possible types of constraints). As some constraints may not depend exclusively on a table, all the constraints are attached to the database itself. It implements the #GdaXmlStorage and #GdaReferer interfaces. @CONSTRAINT_PRIMARY_KEY: @CONSTRAINT_FOREIGN_KEY: @CONSTRAINT_UNIQUE: @CONSTRAINT_NOT_NULL: @CONSTRAINT_CHECK_EXPR: @CONSTRAINT_CHECK_IN_LIST: @CONSTRAINT_CHECK_SETOF_LIST: @CONSTRAINT_UNKNOWN: @CONSTRAINT_FK_ACTION_CASCADE: @CONSTRAINT_FK_ACTION_SET_NULL: @CONSTRAINT_FK_ACTION_SET_DEFAULT: @CONSTRAINT_FK_ACTION_SET_VALUE: @CONSTRAINT_FK_ACTION_NO_ACTION: @table: @type: @Returns: @db: @Returns: @cstr: @Returns: @cstr1: @cstr2: @Returns: @cstr: @Returns: @cstr: @field: @Returns: @cstr: @fields: @cstr: @Returns: @cstr: @pairs: @cstr: @Returns: @cstr: @Returns: @cstr: @on_update: @on_delete: @cstr: @on_update: @on_delete: @cstr: @fields: @cstr: @Returns: @cstr: @field: @cstr: @Returns: