删除了表的所有约束、视图以及表

我相信经常有同学想删除某一个表时，遇到这样或那样的约束无法删除一头雾水，这时您请不要着急，先看看以下提供的删除所有约束、表、视图等sql脚本，或在测试环境试用。 但是您也可以仅删除某一个对象（表）的所有约束或全部约束，您只需要把游标里用到的SELECT查询语句单独拿出来执行一下，自己看看就明白了，删除了表的所有约束、视图之后就可以删除表了。

--删除所有外键约束
DECLARE @SQL VARCHAR(99)
DECLARE CUR_CONSTRAINT CURSOR LOCAL FOR
  SELECT 'ALTER TABLE ' + CASE WHEN O.schema_id IS NOT NULL THEN (SELECT NAME+'.' FROM sys.schemas WHERE schema_id = O.schema_id) ELSE '' END
         + Object_name(parent_object_id)
         + ' DROP CONSTRAINT '
         + Object_name(object_id)
  FROM   sys.objects AS O
         JOIN sys.schemas AS S
           ON O.schema_id = S.schema_id
  WHERE  O.type IN( 'C', 'D', 'F' );
 
OPEN CUR_CONSTRAINT;
FETCH CUR_CONSTRAINT INTO @SQL;
WHILE @@FETCH_STATUS = 0
  BEGIN
      EXEC(@SQL);
      FETCH CUR_CONSTRAINT INTO @SQL;
  END;

CLOSE CUR_CONSTRAINT;
DEALLOCATE CUR_CONSTRAINT;

--删除所有视图（存储过程、函数等用同样的方法）
DECLARE @SQL VARCHAR(99);
DECLARE CUR_VIEW CURSOR LOCAL FOR
  SELECT 'IF OBJECT_ID(''' + CASE WHEN O.schema_id IS NOT NULL THEN (SELECT NAME+'.' FROM sys.schemas WHERE schema_id = O.schema_id) ELSE '' END
         + Object_name(object_id) + ''') IS NOT NULL'+
         + ' DROP VIEW ' + CASE WHEN O.schema_id IS NOT NULL THEN (SELECT NAME+'.' FROM sys.schemas WHERE schema_id = O.schema_id) ELSE '' END + Object_name(object_id)
  FROM   sys.objects AS O
         JOIN sys.schemas AS S
           ON O.schema_id = S.schema_id
  WHERE  O.type IN( 'V' );
 
OPEN CUR_VIEW;
FETCH CUR_VIEW INTO @SQL;
WHILE @@FETCH_STATUS = 0
  BEGIN
      EXEC(@SQL);
      FETCH CUR_VIEW INTO @SQL;
  END;
CLOSE CUR_VIEW;
DEALLOCATE CUR_VIEW;

-- 删除所有表
DECLARE @SQL VARCHAR(99);
DECLARE CUR_TABLE CURSOR LOCAL FOR
  SELECT 'DROP TABLE ' + CASE WHEN O.schema_id IS NOT NULL THEN (SELECT NAME+'.' FROM sys.schemas WHERE schema_id = O.schema_id) ELSE '' END + O.name
  FROM   sys.objects AS O
         JOIN sys.schemas AS S
           ON O.schema_id = S.schema_id
  WHERE  O.type = 'U';

OPEN CUR_TABLE;
FETCH CUR_TABLE INTO @SQL;

WHILE @@FETCH_STATUS = 0
  BEGIN
      EXEC(@SQL);
      FETCH CUR_TABLE INTO @SQL;
  END
CLOSE CUR_TABLE;
DEALLOCATE CUR_TABLE;