Question

知道为什么我的@ProductNumber游标变量在动态语句中使用时不起作用？它说“必须声明标量变量”。但这是一个游标变量。但是，当我使用它时，它不是动态的，它可行。感谢。

DECLARE @TargetDB NVARCHAR(50)
DECLARE @SourceDB NVARCHAR(50)
DECLARE @DateEffectiveFrom datetime
DECLARE @InsertRecords NVARCHAR(1000)
SET @TargetDB = 'MySSISDb'
SET @SourceDB = 'MySSISDb2'
SET @DateEffectiveFrom = '2013-12-29'

Declare @ProductNumber INT;
DECLARE @SqlDb NVARCHAR(Max)
DECLARE Cur1 CURSOR FOR SELECT CAST(@SqlDb AS NVARCHAR(MAX))
SET @SqlDb = 'SELECT ProductNumber From '+@SourceDB+'.dbo.Item (NOLOCK)
             WHERE NOT EXISTS (SELECT 1 FROM '+@TargetDB+'.dbo.Item2 
                 WHERE ProductNumber   = '+@SourceDB+'.dbo.Item.ProductNumber)'
EXEC sp_executesql @SqlDb

OPEN Cur1
FETCH NEXT FROM Cur1 INTO @ProductNumber;

WHILE @@FETCH_STATUS = 0
BEGIN

SET @InsertRecords = 'INSERT INTO ' + @TargetDB +  '.dbo.Item2(
                           ProductNumber,   ProductName, ListPrice, BirthDate) 
             SELECT ProductNumber, ProductName, 
                ListPrice, ''' + CONVERT(nvarchar(25),@DateEffectiveFrom,120) + '''
         FROM ' + @SourceDB + '.dbo.Item
         WHERE ' + @SourceDB + '.dbo.Item.ProductNumber = @ProductNumber'

--WHERE ' + @SourceDB + '.dbo.Item.ProductNumber = @ProductNumber 
--(this is where the     problem)

EXEC sp_executesql @InsetRecords

FETCH NEXT FROM Cur1 INTO @ProductNumber;
END
CLOSE Cur1;
DEALLOCATE Cur1;

Answer 1

将光标的声明转换为SQLDb变量。在SQL Server中，至少在执行@SQLDb后可以访问游标名称“Cur1”。另外，我已经将@ProductNumber的使用移到了文字字符串之外，并在游标循环中修改了第二个EXEC语句的拼写错误（@InsetRecords to @InsertRecords）。

DECLARE @TargetDB NVARCHAR(50)
DECLARE @SourceDB NVARCHAR(50)
DECLARE @DateEffectiveFrom datetime
DECLARE @InsertRecords NVARCHAR(1000)
SET @TargetDB = 'MySSISDb'
SET @SourceDB = 'MySSISDb2'
SET @DateEffectiveFrom = '2013-12-29'

Declare @ProductNumber INT;
DECLARE @SqlDb NVARCHAR(Max)

SET @SqlDb = '
  DECLARE Cur1 CURSOR FOR
    SELECT ProductNumber 
    From '+@SourceDB+'.dbo.Item (NOLOCK)
    WHERE NOT EXISTS (
      SELECT 1 
      FROM '+@TargetDB+'.dbo.Item2 
      WHERE ProductNumber   = '+@SourceDB+'.dbo.Item.ProductNumber)'

EXEC sp_executesql @SqlDb

OPEN Cur1
FETCH NEXT FROM Cur1 INTO @ProductNumber;

WHILE @@FETCH_STATUS = 0
BEGIN

SET @InsertRecords = 'INSERT INTO ' + @TargetDB +  '.dbo.Item2(
                           ProductNumber,   ProductName, ListPrice, BirthDate) 
             SELECT ProductNumber, ProductName, 
                ListPrice, ''' + CONVERT(nvarchar(25),@DateEffectiveFrom,120) + '''
         FROM ' + @SourceDB + '.dbo.Item
         WHERE ' + @SourceDB + '.dbo.Item.ProductNumber = ' + CONVERT(nvarchar(max), @ProductNumber)

EXEC sp_executesql @InsertRecords

FETCH NEXT FROM Cur1 INTO @ProductNumber;
END

CLOSE Cur1;
DEALLOCATE Cur1;

SQL游标变量不能在条件中使用

1 个答案: