级联主键更新所有引用外键

Question

级联主键更新所有引用外键

mou*_*aim 13 sql-server-2008 foreign-key sql-server referential-integrity update

是否可以通过在引用它的所有外键之间级联更新来更新主键列值？

# EDIT 1: 当我运行 followinq 查询

select * from sys.foreign_keys where referenced_object_id=OBJECT_ID('myTable')

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，我看到 update_referential_action 设置为 0。因此更新我的主键列后没有采取任何操作。如何更新外键以使其ON CASCADE UPDATE？

# EDIT 2：
为了编写或删除架构中所有外键的脚本，请运行以下脚本（取自此处）

DECLARE @schema_name sysname;

DECLARE @table_name sysname;

DECLARE @constraint_name sysname;

DECLARE @constraint_object_id int;

DECLARE @referenced_object_name sysname;

DECLARE @is_disabled bit;

DECLARE @is_not_for_replication bit;

DECLARE @is_not_trusted bit;

DECLARE @delete_referential_action tinyint;

DECLARE @update_referential_action tinyint;

DECLARE @tsql nvarchar(4000);

DECLARE @tsql2 nvarchar(4000);

DECLARE @fkCol sysname;

DECLARE @pkCol sysname;

DECLARE @col1 bit;

DECLARE @action char(6);  

DECLARE @referenced_schema_name sysname;



DECLARE FKcursor CURSOR FOR

     select OBJECT_SCHEMA_NAME(parent_object_id)

         , OBJECT_NAME(parent_object_id), name, OBJECT_NAME(referenced_object_id)

         , object_id

         , is_disabled, is_not_for_replication, is_not_trusted

         , delete_referential_action, update_referential_action, OBJECT_SCHEMA_NAME(referenced_object_id)

    from sys.foreign_keys

    order by 1,2;

OPEN FKcursor;

FETCH NEXT FROM FKcursor INTO @schema_name, @table_name, @constraint_name

    , @referenced_object_name, @constraint_object_id

    , @is_disabled, @is_not_for_replication, @is_not_trusted

    , @delete_referential_action, @update_referential_action, @referenced_schema_name;

WHILE @@FETCH_STATUS = 0

BEGIN



      IF @action <> 'CREATE'

        SET @tsql = 'ALTER TABLE '

                  + QUOTENAME(@schema_name) + '.' + QUOTENAME(@table_name)

                  + ' DROP CONSTRAINT ' + QUOTENAME(@constraint_name) + ';';

    ELSE

        BEGIN

        SET @tsql = 'ALTER TABLE '

                  + QUOTENAME(@schema_name) + '.' + QUOTENAME(@table_name)

                  + CASE @is_not_trusted

                        WHEN 0 THEN ' WITH CHECK '

                        ELSE ' WITH NOCHECK '

                    END

                  + ' ADD CONSTRAINT ' + QUOTENAME(@constraint_name)

                  + ' FOREIGN KEY (';

        SET @tsql2 = '';

        DECLARE ColumnCursor CURSOR FOR

            select COL_NAME(fk.parent_object_id, fkc.parent_column_id)

                 , COL_NAME(fk.referenced_object_id, fkc.referenced_column_id)

            from sys.foreign_keys fk

            inner join sys.foreign_key_columns fkc

            on fk.object_id = fkc.constraint_object_id

            where fkc.constraint_object_id = @constraint_object_id

            order by fkc.constraint_column_id;

        OPEN ColumnCursor;

        SET @col1 = 1;

        FETCH NEXT FROM ColumnCursor INTO @fkCol, @pkCol;

        WHILE @@FETCH_STATUS = 0

        BEGIN

            IF (@col1 = 1)

                SET @col1 = 0;

            ELSE

            BEGIN

                SET @tsql = @tsql + ',';

                SET @tsql2 = @tsql2 + ',';

            END;

            SET @tsql = @tsql + QUOTENAME(@fkCol);

            SET @tsql2 = @tsql2 + QUOTENAME(@pkCol);

            FETCH NEXT FROM ColumnCursor INTO @fkCol, @pkCol;

        END;

        CLOSE ColumnCursor;

        DEALLOCATE ColumnCursor;

       SET @tsql = @tsql + ' ) REFERENCES ' + QUOTENAME(@referenced_schema_name) + '.' + QUOTENAME(@referenced_object_name)

                  + ' (' + @tsql2 + ')';

        SET @tsql = @tsql

                  + ' ON UPDATE ' + CASE @update_referential_action

                                        WHEN 0 THEN 'NO ACTION '

                                        WHEN 1 THEN 'CASCADE '

                                        WHEN 2 THEN 'SET NULL '

                                        ELSE 'SET DEFAULT '

                                    END

                  + ' ON DELETE ' + CASE @delete_referential_action

                                        WHEN 0 THEN 'NO ACTION '

                                        WHEN 1 THEN 'CASCADE '

                                        WHEN 2 THEN 'SET NULL '

                                        ELSE 'SET DEFAULT '

                                    END

                  + CASE @is_not_for_replication

                        WHEN 1 THEN ' NOT FOR REPLICATION '

                        ELSE ''

                    END

                  + ';';

        END;

    PRINT @tsql;

    IF @action = 'CREATE'

        BEGIN

        SET @tsql = 'ALTER TABLE '

                  + QUOTENAME(@schema_name) + '.' + QUOTENAME(@table_name)

                  + CASE @is_disabled

                        WHEN 0 THEN ' CHECK '

                        ELSE ' NOCHECK '

                    END

                  + 'CONSTRAINT ' + QUOTENAME(@constraint_name)

                  + ';';

        PRINT @tsql;

        END;

    FETCH NEXT FROM FKcursor INTO @schema_name, @table_name, @constraint_name

        , @referenced_object_name, @constraint_object_id

        , @is_disabled, @is_not_for_replication, @is_not_trusted

        , @delete_referential_action, @update_referential_action, @referenced_schema_name;

END;

CLOSE FKcursor;

DEALLOCATE FKcursor;

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要生成 DROP 外键脚本，请在声明子句中将 @action 值修改为等于 'DROP' ：