Question

好吧，自从我之前post以来，我就取得了进步！但是，我又遇到了另一个问题：

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（更新）：每次迭代都不会更新@tmpInserVars。它在第一次输入代码时设置，并且永远不会刷新。

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.PK=@PK
              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)
   RAISERROR(N'Table (outside): %s',0,1,@curTable) WITH NOWAIT  

   IF @@ROWCOUNT = 0 
   BEGIN
        --@tmpInsertVars isn't updating!!!
        RAISERROR(N'Initial Select: %s',0,1,@tmpStatement) WITH NOWAIT
        SELECT @tmpInsertVars = COALESCE(@tmpInsertVars + ',','') + COLUMN_NAME 
        FROM PRODDB.INFORMATION_SCHEMA.COLUMNS
        WHERE TABLE_NAME = @curTable

        SET @tmpInsertStatement = 'INSERT INTO [MYCONN].TEST_MYDB.dbo.' + @curTable + ' (' + @tmpInsertVars + ')' +
                                  ' SELECT TOP 500 ' + @tmpInsertVars +
                                  ' FROM TEST_MYDB.' + @curTable +
                                  ' WHERE PK=' + Cast(@PK as nvarchar(10))

        RAISERROR(N'Insert Statement: %s',0,1,@tmpInsertStatement) WITH NOWAIT
   END


   FETCH NEXT FROM TableCursor INTO @curTable
END

CLOSE TableCursor
DEALLOCATE TableCursor

Answer 1

声明你的@tmpInsertStatement和@tmpInsertVars变量。

在填充之前将@tmpInsertVars重置为NULL

USE MAINDB
DECLARE @PK int = 1000,
 @TaskName nvarchar(50) = 'TASK', 
 @curTable nvarchar(75),
 @curRow nvarchar(75),
 @tmpStatement nvarchar(500),
 @tmpInsert nvarchar(500),
 @tmpInsertStatement nvarchar(500),
 @tmpInsertVars 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.PK=@PK
              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)
   RAISERROR(N'Table (outside): %s',0,1,@curTable) WITH NOWAIT  

   IF @@ROWCOUNT = 0 
   BEGIN
        --@tmpInsertVars isn't updating!!!
        SELECT @tmpInsertVars = NULL; -- RESET @tmpInsertVars
        RAISERROR(N'Initial Select: %s',0,1,@tmpStatement) WITH NOWAIT
        SELECT @tmpInsertVars = COALESCE(@tmpInsertVars + ',','') + COLUMN_NAME 
        FROM PRODDB.INFORMATION_SCHEMA.COLUMNS
        WHERE TABLE_NAME = @curTable

        SET @tmpInsertStatement = 'INSERT INTO [MYCONN].TEST_MYDB.dbo.' + @curTable + ' (' + @tmpInsertVars + ')' +
                                  ' SELECT TOP 500 ' + @tmpInsertVars +
                                  ' FROM TEST_MYDB.' + @curTable +
                                  ' WHERE PK=' + Cast(@PK as nvarchar(10))

        RAISERROR(N'Insert Statement: %s',0,1,@tmpInsertStatement) WITH NOWAIT
   END


   FETCH NEXT FROM TableCursor INTO @curTable
END

CLOSE TableCursor
DEALLOCATE TableCursor

T-SQL动态地从测试转移到生产（第2部分）

1 个答案: