Sqlserver

-- 变量声明  
DECLARE @tableName NVARCHAR(256)  
DECLARE @indexName NVARCHAR(128)  
DECLARE @triggerName NVARCHAR(256)  
DECLARE @sql NVARCHAR(MAX)  
DECLARE @constraintsname NVARCHAR(256)  
-- 声明游标来遍历所有用户表  
DECLARE curTables CURSOR FOR   
SELECT name   
FROM sys.tables   
WHERE type = 'U' -- 用户表  -- 打开游标  
OPEN curTables  
FETCH NEXT FROM curTables INTO @tableName  -- 循环遍历所有表  
WHILE @@FETCH_STATUS = 0  
BEGIN  -- 删除索引source  BEGIN TRY  SELECT @indexName = name  FROM sys.indexes  WHERE object_id = OBJECT_ID(@tableName)  AND name = 'I_PanguSyncSourceTimestamp'  IF @indexName IS NOT NULL  BEGIN  SET @sql = 'DROP INDEX ' + QUOTENAME(@indexName) + ' ON ' + QUOTENAME(@tableName) + ';'  EXEC sp_executesql @sql  PRINT 'Index I_PanguSyncSourceTimestamp dropped from ' + @tableName + '.'  END  END TRY  BEGIN CATCH  PRINT 'Error dropping index I_PanguSyncSourceTimestamp from ' + @tableName + '. Error: ' + ERROR_MESSAGE()  END CATCH  --删除CONSTRAINT sourceSELECT top 1 @constraintsname= c.name FROM sysconstraints a 
INNER JOIN syscolumns b  on a.colid=b.colid
INNER JOIN sysobjects c  on a.constid=c.id
WHERE a.id=object_id(@tableName)
AND b.name='C_PanguSyncSourceTimestamp'IF @constraintsname IS NOT NULL 	BEGIN  SET @sql = 'ALTER TABLE ' + QUOTENAME(@tableName) + ' DROP CONSTRAINT '+ QUOTENAME(@constraintsname)+';'EXEC sp_executesql @sql  END  -- 删除字段  sourceIF EXISTS (  SELECT 1   FROM sys.columns   WHERE name = 'C_PanguSyncSourceTimestamp'   AND object_id = OBJECT_ID(@tableName)  )  BEGIN  SET @sql = 'ALTER TABLE ' + QUOTENAME(@tableName) + ' DROP COLUMN C_PanguSyncSourceTimestamp;'  EXEC sp_executesql @sql  PRINT 'Column C_PanguSyncSourceTimestamp dropped from ' + @tableName  END  -- 删除索引 targetBEGIN TRY  SELECT @indexName = name  FROM sys.indexes  WHERE object_id = OBJECT_ID(@tableName)  AND name = 'I_PanguSyncTargetTimestamp'  IF @indexName IS NOT NULL  BEGIN  SET @sql = 'DROP INDEX ' + QUOTENAME(@indexName) + ' ON ' + QUOTENAME(@tableName) + ';'  EXEC sp_executesql @sql  PRINT 'Index I_PanguSyncTargetTimestamp dropped from ' + @tableName + '.'  END  END TRY  BEGIN CATCH  PRINT 'Error dropping index I_PanguSyncTargetTimestamp from ' + @tableName + '. Error: ' + ERROR_MESSAGE()  END CATCH  --删除CONSTRAINT targetSELECT top 1 @constraintsname= c.name FROM sysconstraints a 
INNER JOIN syscolumns b  on a.colid=b.colid
INNER JOIN sysobjects c  on a.constid=c.id
WHERE a.id=object_id(@tableName)
AND b.name='C_PanguSyncTargetTimestamp'IF @constraintsname IS NOT NULL 	BEGIN  SET @sql = 'ALTER TABLE ' + QUOTENAME(@tableName) + ' DROP CONSTRAINT '+ QUOTENAME(@constraintsname)+';'EXEC sp_executesql @sql  END  -- 删除字段  targetIF EXISTS (  SELECT 1   FROM sys.columns   WHERE name = 'C_PanguSyncTargetTimestamp'   AND object_id = OBJECT_ID(@tableName)  )  BEGIN  SET @sql = 'ALTER TABLE ' + QUOTENAME(@tableName) + ' DROP COLUMN C_PanguSyncTargetTimestamp;'  EXEC sp_executesql @sql  PRINT 'Column C_PanguSyncTargetTimestamp dropped from ' + @tableName  END  -- 删除触发器（包含PGD或PanguSync）  DECLARE curTriggers CURSOR FOR   SELECT name   FROM sys.triggers   WHERE OBJECT_NAME(parent_id) = @tableName  AND name LIKE '%_PGD_%' OR name LIKE '%PanguSync%'  OPEN curTriggers  FETCH NEXT FROM curTriggers INTO @triggerName  WHILE @@FETCH_STATUS = 0  BEGIN  SET @sql = 'DROP TRIGGER ' + QUOTENAME(@triggerName) + ';'  EXEC sp_executesql @sql  PRINT 'Trigger ' + @triggerName + ' dropped from ' + @tableName + '.'  FETCH NEXT FROM curTriggers INTO @triggerName  END  CLOSE curTriggers  DEALLOCATE curTriggers  -- 获取下一个表名  FETCH NEXT FROM curTables INTO @tableName  
END  -- 关闭并释放游标  
CLOSE curTables  
DEALLOCATE curTables