Question

我写了一个SP，它将表名作为参数并选择一些值并计算它。我的SP如下： -

ALTER PROCEDURE [dbo].[usp_Get_MessageType_And_Count] 
       @table_name varchar(max)  
AS
BEGIN

DECLARE @ActualTableName AS NVarchar(255)

    SELECT @ActualTableName = QUOTENAME( TABLE_NAME )
    FROM INFORMATION_SCHEMA.TABLES
    WHERE TABLE_NAME = @table_name

DECLARE @sql AS NVARCHAR(MAX)
    SELECT @sql =
'select [MessageType],count([MessageType]) as Count
from
(SELECT Split.a.value(''.'+','+ 'VARCHAR(100)'') AS [MessageType]  
 FROM  (SELECT [Message Type],  
         CAST ('+'<M>'+' + REPLACE([Message Type], '+','+', '+'</M><M>'+') + '+'<M>'+' AS XML) AS [MessageType]  
     FROM  ' + @table_name +') AS A CROSS APPLY [MessageType].nodes ('+'/M'+') AS Split(a)) as tab group by [MessageType]'

   EXEC(@sql)  
END

执行存储过程时出现以下错误： -

Msg 102，Level 15，State 1，Line 7语法不正确＆＃39;＆lt;＆＃39;。

请帮助我，因为我无法找到我做错的地方。任何帮助将不胜感激。在此先感谢!!

Answer 1

我认为你正在寻找这样的东西：

ALTER PROCEDURE [dbo].[usp_Get_MessageType_And_Count] 
       @table_name varchar(max)  
AS
BEGIN

DECLARE @ActualTableName AS NVarchar(255)

    SELECT @ActualTableName = QUOTENAME( TABLE_NAME )
    FROM INFORMATION_SCHEMA.TABLES
    WHERE TABLE_NAME = @table_name

DECLARE @sql AS NVARCHAR(MAX)
    SELECT @sql =
'select [MessageType],count([MessageType]) as Count
from
(SELECT Split.a.value(''.'',''VARCHAR(100)'') AS [MessageType]  
 FROM  (SELECT [Message Type] AS [Message Type CSV],  
         CAST (''<M>'' + REPLACE([Message Type], '','',''</M><M>'') + ''</M>'' AS XML) AS [MessageType]  
     FROM  ' + @table_name +') AS A CROSS APPLY [MessageType].nodes (''/M'') AS Split(a)) as tab group by [MessageType]'

   EXEC(@sql)  
END

希望这有帮助。

Answer 2

使用以下存储过程。当你得到表名时我改变了逻辑，否则它会出错并且我确保列＆＃34;消息类型＆＃34;也存在，否则也会导致错误。

ALTER PROCEDURE [dbo].[usp_Get_MessageType_And_Count] 
       @table_name varchar(max)  
AS

BEGIN

SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED
SET NOCOUNT ON

DECLARE @ActualTableName AS NVARCHAR(255),
    @sql AS NVARCHAR(MAX)


    SELECT @ActualTableName = t.TABLE_NAME
    FROM INFORMATION_SCHEMA.TABLES t
    INNER JOIN INFORMATION_SCHEMA.COLUMNS c
        ON t.TABLE_NAME = c.TABLE_NAME
    WHERE t.TABLE_NAME = @table_name
        AND c.COLUMN_NAME = 'Message Type'

IF (@ActualTableName IS NOT NULL)
BEGIN

   SELECT @sql =
    'SELECT [MessageType],
        COUNT([MessageType]) as CountValue
    FROM
    (
     SELECT Split.a.value(''.'', ''VARCHAR(100)'') AS [MessageType]  
     FROM  (SELECT CAST (''<M>'' + REPLACE([Message Type], '','', ''</M><M>'') + ''</M>'' AS XML) AS [MessageType]  
            FROM ' + @ActualTableName + '
            ) AS A 
     CROSS APPLY [MessageType].nodes (''/M'') AS Split(a)) AS tab 
     GROUP BY [MessageType]'

   EXEC(@sql)  
END

ELSE
BEGIN
    SELECT 'Table/column does not exist' AS [Message]
END


END

运行存储过程时出错

2 个答案: