Question

我需要查询帮助。在我的查询中，我想将我的表名作为参数传递。这是我的问题：

SELECT DISTINCT 
    CONVERT (varchar, InspectDateTime) AS 'Inspect Date Time', 
    CONVERT (varchar, SynDateTime) AS 'Sync Date Time', 
    Employee, 
    ROUND(OverAllPercentage, 2) AS Grade 
FROM 
    Table_Name 
WHERE 
    (DATEADD(dd, DATEDIFF(dd, 0, InspectDateTime), 0) 
    BETWEEN 
        DATEADD(dd, DATEDIFF(dd, 0, @From ), 0) AND 
        DATEADD(dd, DATEDIFF(dd, 0, @To ), 0)) 
ORDER BY 
    'Inspect Date Time'

这里我想传递Table_Name作为参数。请注意，此查询已将两个aurguments作为参数，即"@From“和”@To“

此致阿卜杜拉

Answer 1

在SQL Server中，如果要“参数化”表名，则必须使用动态SQL

如果是这样，你必须阅读 Erland的The Curse and Blessing of dynamic SQL作为介绍。

基本上，您需要将SQL语句构建为字符串，然后执行它。没有其他方法可以在SQL Server T-SQL语句中“参数化”表名。

Answer 2

好的，假设您正在使用SQL Server（根据DATEADD和DATEDIFF函数判断），您需要

构造一个连接的sql命令作为字符串（注意不要允许 SQL注入：即你应该检查你的table_name变量是一个查找有效的表名可能的名称形式 information_schema并验证等）
使用执行动态sql sp_executesql：http://msdn.microsoft.com/en-us/library/ms188001.aspx

Answer 3

如果您正在使用MS SQL，则可以执行以下操作：

CREATE PROCEDURE sp_GetMyStuff
(
    @From datetime,
    @To datetime,
    @TableName nvarchar(100)
)
AS

exec('    
    SELECT DISTINCT 
        CONVERT (varchar, InspectDateTime) AS ''Inspect Date Time'', 
        CONVERT (varchar, SynDateTime) AS ''Sync Date Time'', 
        Employee, 
        ROUND(OverAllPercentage, 2) AS Grade 
    FROM 
        ' + @TableName + ' 
    WHERE 
        (DATEADD(dd, DATEDIFF(dd, 0, InspectDateTime), 0) 
        BETWEEN 
            DATEADD(dd, DATEDIFF(dd, 0, ' + @From + '), 0) AND 
            DATEADD(dd, DATEDIFF(dd, 0, ' + @To + '), 0)) 
    ORDER BY 
        1
');

然后只是称之为

sp_GetMyStuff '2011-05-05', '2011-06-05', 'TBL_MYTABLE'

Answer 4

谢谢balexandre。经过微小修改（将@ From，@ To转换为varchar）后的最终查询是：

CREATE PROCEDURE sp_GetMyStuff

@TableName VARCHAR(128),
@From DATETIME,
@To DATETIME

AS

DECLARE @sql VARCHAR(4000)
SELECT @sql = 'SELECT DISTINCT CONVERT (varchar, InspectDateTime) AS ''Inspect Date Time'', CONVERT (varchar, SynDateTime) AS ''Sync Date Time'', Employee, ROUND(OverAllPercentage, 2) AS Grade
FROM ' + @TableName + '
WHERE
(DATEADD(dd, DATEDIFF(dd, 0, InspectDateTime), 0) BETWEEN DATEADD(dd, DATEDIFF(dd, 0,'''+ CAST(@From AS VARCHAR(100)) +''' ), 0)
AND DATEADD(dd, DATEDIFF(dd, 0,'''+ CAST(@To AS VARCHAR(100)) +'''), 0))
ORDER BY ''Inspect Date Time'''
EXEC (@sql)

GO

需要有关SQL查询的帮助

4 个答案: