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我有一个冗长且非常重复的查询，我需要每 5 分钟运行一次以进行报告，下面有几个 select 语句的摘录，我有 26 个与此类似的列需要总共运行 6 行不同的行，每行都有 7 个不同的 where 语句，基于时间框架、作业和运算符，所以与其创建大量的 T-SQL，并且每五分钟运行一次我想尝试创建一个存储过程，其中传递给它的参数是两位数的行号（在下面的示例中为“05”）、where 条件和列的标识符（在下面的示例中为“作业”）。我遇到的问题是连接 select 语句中的列名，我尝试了许多方法，但都没有奏效。

示例（是的，我知道很多转换为十进制，我想对自己大喊大叫，因为一切都是 varchar，但是将数据从我们的制造机器传输到 Db 的应用程序只会写为时间戳的字符串或日期时间，而 charindex 是因为我看到数据被放到小数点后 20 位，在极少数情况下甚至更远）

    ,AVG(CAST(LEFT("E05UP", (CHARINDEX(',', E05UP, 5) + 6)) AS decimal(11,6)))*100 AS JobE05Up
        ,AVG(CAST(LEFT(E05QUAL, (CHARINDEX(',', E05QUAL, 5) + 6)) AS decimal(11,6)))*100 AS JobE05Qual
        ,CASE WHEN AVG(CAST(LEFT(E05UP, (CHARINDEX(',', E05UP, 5) + 6)) AS decimal(11,6)))>0 AND AVG(CAST(LEFT(E05SPD, (CHARINDEX(',', E05SPD, 5) + 6)) AS decimal(11,6)))>0 AND 
            AVG(CAST(LEFT(E05QUAL, (CHARINDEX(',', E05QUAL, 5) + 6)) AS decimal(11,6)))>0 THEN (AVG(CAST(LEFT(E05UP, (CHARINDEX(',', E05UP, 5) + 6)) AS decimal(11,6)))*
            (AVG(CAST(LEFT(E05SPD, (CHARINDEX(',', E05Spd, 5) + 6)) AS decimal(11,6)))/@E05SpeedMAX)*AVG(CAST(LEFT(E05QUAL, (CHARINDEX(',', E05QUAL, 5) + 6)) AS decimal(11,6)))*100)
            ELSE 0 END AS JobE05OEE

简而言之，我想做的是：

    SELECT AVG(E+@P1+SPD) AS @P2+Speed FROM Test.Dbo.Line+@P1 WHERE @P3

编辑：整个查询从最后一个 Db 只写中选择数据，在将所有 Casts 更改为一个函数之后，唯一会在此报告和此报告的所有其他查询之间更改的是 Line # (L05) the Column Name， where 子句，以及被求和或平均的数字，因为我们将使用不止一行。

DECLARE @L05CurWO as INT
DECLARE @L05CurCount AS INT
DECLARE @L05SpeedMAX AS INT
DECLARE @E05SpeedMAX AS INT
DECLARE @H05SpeedMAX AS INT
DECLARE @P05SpeedMAX AS INT
DECLARE @C05SpeedMAX AS INT
DECLARE @L05CurQual AS Decimal(11,6)

--Set Maximum Line Speeds Speeds
SET @L05SpeedMAX = 147
SET @E05SpeedMAX = 147
SET @H05SpeedMAX = 147
SET @P05SpeedMAX = 147
SET @C05SpeedMAX = 147


SET @L05CurWO = (SELECT TOP 1 L05WO FROM WB.dbo.Line05 WHERE L05WO IS NOT NULL ORDER BY L05Time DESC)
SET @L05CurCount = (SELECT SUM(dbo.TOD(E05Count)) FROM WB.dbo.Line05 WHERE L05WO = @L05CurWO)
SET @L05CurQual = (SELECT TOP 1 CASE WHEN dbo.TOD(L05Count)<1 THEN 0 ELSE CASE WHEN dbo.TOD(L05Blowoff)<1 THEN 1 ELSE (1-(dbo.TOD(L05Blowoff)/
                        dbo.TOD(L05Count))) END END FROM WB.dbo.Line05 WHERE L05WO = @L05CurWO ORDER BY L05Time DESC)


--Select Current Numbers
    SELECT TOP 1 @L05CurWO AS CurrentL05WorkOrder
                    ,L05TE AS CurrentL05TE
                    ,L05TF AS CurrentL05TF
                    ,@L05CurCount AS CurrentL05Count
                    ,@L05JobScrap AS CurrentL05Scrap
                    ,L05QUAN AS CurrentL05Quantity
                    ,dbo.TOD(L05UP)*100 AS CurrentL05Uptime
                    ,dbo.TOD(C05SPD) AS CurrentL05Speed
                    ,@L05CurQual*100 AS CurrentL05Qual
                    ,CASE WHEN dbo.ToD(L05UP)>0 AND dbo.ToD(C05SPD)>0 AND @L05CurQUAL>0 THEN dbo.ToD(L05UP)*(dbo.ToD(C05SPD)/@L05SpeedMAX)*@L05CurQual ELSE 0 END AS CurrentL05OEE
                    ,dbo.ToD(E05SPD) AS CurrentE05Speed
                    ,dbo.ToD(E05UP)*100 AS CurrentE05Up
                    ,dbo.ToD(E05QUAL)*100 AS CurrentE05Qual
                    ,CASE WHEN dbo.ToD(E05UP)>0 AND dbo.ToD(E05SPD)>0 AND dbo.ToD(E05QUAL)>0 THEN (dbo.ToD(E05UP)*(dbo.ToD(E05SPD)/@E05SpeedMAX)*(1-(dbo.ToD(E05Blowoff)/
                     dbo.ToD(E05Count)))*100) ELSE 0 END AS CurrentE05OEE
                    ,dbo.ToD(H05SPD) AS CurrentH05Speed
                    ,dbo.ToD(H05UP)*100 AS CurrentH05Up
                    ,dbo.ToD(H05QUAL)*100 AS CurrentH05Qual
                    ,CASE WHEN dbo.ToD(H05UP)>0 AND dbo.ToD(H05SPD)>0 AND dbo.ToD(H05QUAL)>0 THEN (dbo.ToD(H05UP)*(dbo.ToD(H05SPD)/@H05SpeedMAX)*(1-(dbo.ToD(H05Blowoff)/
                     dbo.ToD(H05Count)))*100) ELSE 0 END AS CurrentH05OEE
                    ,dbo.ToD(P05SPD) AS CurrentP05Speed
                    ,dbo.ToD(P05UP)*100 AS CurrentP05Up
                    ,dbo.ToD(P05QUAL)*100 AS CurrentP05Qual
                    ,CASE WHEN dbo.ToD(P05UP)>0 AND dbo.ToD(P05SPD)>0 AND dbo.ToD(P05QUAL)>0 THEN (dbo.ToD(P05UP)*(dbo.ToD(P05SPD)/@P05SpeedMAX)*(1-(dbo.ToD(P05Blowoff)/
                     dbo.ToD(P05Count)))*100) ELSE 0 END AS CurrentP05OEE
                    ,dbo.ToD(C05SPD) AS CurrentC05Speed
                    ,dbo.ToD(C05UP)*100 AS CurrentC05Up
                    ,dbo.ToD(C05QUAL)*100 AS CurrentE05Qual
                    ,CASE WHEN dbo.ToD(C05UP)>0 AND dbo.ToD(C05SPD)>0 AND dbo.ToD(C05QUAL)>0 THEN (dbo.ToD(C05UP)*(dbo.ToD(C05SPD)/@P05SpeedMAX)*(1-(dbo.ToD(C05Blowoff)/
                     dbo.ToD(C05Count)))*100) ELSE 0 END AS CurrentC05OEE
    FROM WB.dbo.Line05
    WHERE L05WO = @L05CurWO
    ORDER BY L05Time DESC
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从...开始

Create Function dbo.ToD(@val as varchar(max)) Returns Decimal(11, 6) As
Begin
  Return Cast(Left(@val, (CharIndex(',', @val, 5) + 6)) As Decimal(11, 6))
End

我认为下一步是动态 sql，这样的事情应该会让你走上正轨。（如果@Col来自用户输入，则存在sql注入漏洞）：

这是完全未经测试的，所以会有愚蠢的错误。我也可能误解了从查询到查询哪些位会发生变化，哪些保持不变。我不是 100% 确定通过动态 sql 设置参数的机制有效，但我在How to get sp_executesql result into a variable? . 您可能需要改用临时表。

Declare 
  @Col nvarchar(max) = '05',
  @sql nvarchar(max),
  @params nvarchar(max),
  @CurWO int

-- Dynamically getting one of the current values
Set @sql = N'Set @CurWO = (' + 
           N'Select Top 1 L' + @Col + N'WO' +
           N' From WB.dbo.Line' + @Col + 
           N' Where L' + @Col + N'WO Is Not Null' +
           N' Order By L' + @Col + N'Time Desc)'

-- For diagnosing the inevitable errors
Print @sql

Set @params = N'@CurWO int output'

Exec sp_executesql @sql, @params, @CurWO Output

-- Dynamically executing the main query
Set @sql = N'Select Top 1 @CurWO As CurrentL' + @Col + N'WorkOrder,' + -- @CurWO from last query
           N' L' + @Col + N'TE AS CurrentL' + @Col + N'TE,' +
           N' L' + @Col + N'TF AS CurrentL' + @Col + N'TF,' +
           ...
           N' From WB.dbo.Line' + @Col +
           N' Where L' + @Col + N'WO = @CurWO' +
           N' Order By L' + @Col + N'Time Desc'

-- For diagnosing the inevitable errors
Print @sql

Set @params = N'@CurWO int'

Exec sp_executesql @sql, @params, @CurWO
于 2012-11-13T15:19:48.070 回答