Question

目标：传入两个参数（任务和主键）以生成表列表。获取列表，然后动态构造insert语句，目的是将数据从生产环境复制到测试环境。换句话说，以编程方式执行'EDIT TOP 200'的功能......但速度要快得多。

问题：查询无限期地旋转和运行。应该只有大约20-30个表，查询将需要构建插入语句...所以我让它走了大约2分钟，然后得出结论我可能在某个地方有一个无限循环。请注意，此时我甚至没有在测试数据库中插入任何内容。

目前我只是尝试使用RAISERROR调用显示插入语句的VALUES部分。虽然最终没有实施，但我希望有人可以帮我解决问题。

到目前为止：

USE MAINDB
DECLARE @PK int = 1000,
 @TaskName nvarchar(50) = 'TASK', 
 @curTable nvarchar(75),
 @curRow nvarchar(75),
 @tmpStatement nvarchar(500),
 @tmpInsert nvarchar(500)

RAISERROR('Retrieving Tables',0,1) WITH NOWAIT
 DECLARE TableCursor CURSOR LOCAL FOR 

    SELECT DISTINCT TOP 2 PRMPTTBL.tTable as PromptTable
       FROM THING1 TK INNER JOIN THING2 SC ON TK.tkNo=SC.tkNo
              INNER JOIN Component EL on EL.scNo=SC.scNo             
              LEFT OUTER JOIN Field FLD1 on FLD1.cfNo=EL.cfNoPrompt1            
              LEFT OUTER JOIN MyTableTable MTTTBL on MTTTBL.tbNo=FLD1.tbNo

       WHERE EL.CustNo=@Custno
              AND (MTTTBL.tTable is not NULL AND MTTTBL.tTable not in('OneTableIDontWant'))
              AND MTTTBL.tTable not like '%[_]d%' --eliminate any tables that are actually views
              AND EL.cfNo > 0  
              AND TK.Description like @TaskName

RAISERROR('Table',0,1) WITH NOWAIT
OPEN TableCursor
FETCH NEXT FROM TableCursor INTO @curTable
WHILE @@FETCH_STATUS = 0
BEGIN
   SET @tmpStatement = 'SELECT TOP 5 * FROM [MYCONN].TEST_MYDB.dbo.' + @curTable + ' where PK=' + Cast(@PK as nvarchar(10))
   EXEC (@tmpStatement)

   IF @@ROWCOUNT = 0 
   BEGIN
        DECLARE RowCursor CURSOR LOCAL FOR
        SELECT COLUMN_NAME
        FROM REALDB.INFORMATION_SCHEMA.COLUMNS
        WHERE TABLE_NAME = @curTable

        RAISERROR('Row',0,1) WITH NOWAIT
        OPEN RowCursor
        FETCH NEXT FROM RowCursor INTO @curRow
        WHILE @@FETCH_STATUS = 0
        BEGIN
          SET @tmpInsert = @tmpInsert + ',' + @curRow
        END

        IF RIGHT(@tmpInsert,1) = ',' SET @tmpInsert = LEFT(@tmpInsert,LEN(@tmpInsert) -1)
        RAISERROR(@tmpInsert,0,1) WITH NOWAIT

        CLOSE RowCursor
        DEALLOCATE RowCursor
        SET @tmpInsert = ''
        FETCH NEXT FROM RowCursor INTO @curRow
   END


   FETCH NEXT FROM TableCursor INTO @curTable
END

CLOSE TableCursor
DEALLOCATE TableCursor

Answer 1

    WHILE @@FETCH_STATUS = 0
    BEGIN
      SET @tmpInsert = @tmpInsert + ',' + @curRow
    END

是一个无限循环，因为你里面没有FETCH NEXT。

T-SQL动态地从测试转移到生产

1 个答案: