Question

我正在制作一个storet过程，基本上只进行1次动态查询，其中另一个动态查询的结果为1列的别名。但是，我得到以下两个错误（id没有说明在哪里）：

'='附近的语法不正确。
对象或列名称缺失或为空。对于SELECT INTO语句，请验证每列是否具有名称。对于其他语句，请查找空别名。不允许使用定义为“”或[]的别名。将别名更改为有效名称。

这是我的代码：

    ALTER PROCEDURE myProcedure
        @param1 NVARCHAR(50),
        @param2 NVARCHAR(50),
        @param3 int
    AS
    BEGIN
        DECLARE @query Nvarchar(2000)
        DECLARE @columnName Nvarchar(250)
        DECLARE @columnNameOUT Nvarchar(250)
        set @columnName = ''
        SELECT @query = 'SELECT (@columnNameOUT = CONVERT(time(0), TimeStamps."timeStamp", 108)) AS alias FROM TimeStamps WHERE [param3] = ''' + CAST(@param3 AS VARCHAR) + ''' AND param2 = ''' + @param2 + ''' AND [param1] = ''' + @param1 +''''
        EXECUTE sp_executesql @query, N'@columnNameOUT NVARCHAR(30) OUTPUT', @columnNameOUT = @columnName OUTPUT
        set @query = ''
        IF @param1 IS NULL
        BEGIN
            SELECT @query = 'SELECT column1 AS '''+@columnName+''', column2, column3 ETA FROM myTable WHERE [param3] = '''+CAST(@param3 AS VARCHAR) +''' AND param2 = '''+@param2+''' AND [param1] IS NULL order by column1'
        END
        ELSE
        BEGIN
            SELECT @query = 'SELECT column1 AS '''+@columnName+''', column2, column3 ETA FROM myTable WHERE [param3] = '''+CAST(@param3 AS VARCHAR) +''' AND param2 = '''+@param2+''' AND [param1] ) '''+@param1+''' order by column1'
        END
        EXEC(@query);
    END

Answer 1

首先，支架存在问题：

' AND [param1] ) '

你的第二个问题出在ELSE声明中（有一个解决方案）：

    BEGIN
        SELECT @query = 'SELECT column1, column2, column3 ETA 
        FROM myTable 
        WHERE [param3] = '''+CAST(@param3 AS VARCHAR) +''' 
        AND [param2] = '''+@param2+''' 
        AND [param1] = '''+@param1+''' order by column1';
    END

但第一个问题看起来像这里，但不知道如何解决它：

SELECT @query = 'SELECT (@columnNameOUT = CONVERT(time(0), TimeStamps."timeStamp", 108)) AS alias

希望它可以帮到你

Answer 2

终于自己解决了！

原来这个小查询：

SELECT @query = 'SELECT (@columnNameOUT = CONVERT(time(0), TimeStamps."timeStamp", 108)) AS alias FROM TimeStamps WHERE [param3] = ''' + CAST(@param3 AS VARCHAR) + ''' AND param2 = ''' + @param2 + ''' AND [param1] = ''' + @param1 +''''

有机会回归空虚。所以在添加了IF @columnName = ''之后，一切都解决了。

改变这一行：

... 'SELECT (@columnNameOUT = CONVERT(time(0), TimeStamps."timeStamp", 108)) AS alias FROM ...

对此：

...'SELECT @columnNameOUT = CONVERT(time(0), TimeStamps."timeStamp", 108) FROM...

使另一个错误也消失了：）

错误的语法错误和对象/列名称丢失

2 个答案: