Question

这是我的查询

declare @process varchar(50) ,@id int
set @id=11
set @process='PRODUCTION'

update Tracking 
set TargetbyHour = (
    (
        select cast(replace(costbyhour, '.','')/1 as integer) 
        from Tracking 
        where  trackingid = @TrackingID
    ) /    
    (
        (select   @process 
         from [dbo].[BillingSheet] 
         where  id=@id
        )
    )  
)    
where  TrackingID=@TrackingID

这是错误：

第245级第1州第26行的消息将varchar值“ PRODUCTION”转换为数据类型int时，转换失败。

注意：PRODUCTION是表列名数据类型为float

Answer 1

您无法在SQL中对标识符进行参数化-

package Org.exemple.demo;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

public class App 
{
    public static void main( String[] args ) throws IOException
    {
        System.out.println( "Hello World!" );
        Properties pro = new Properties();
        InputStream input = null;
        try {
            input = App.class.getResourceAsStream("/info.properties");
            pro.load(input);
        }finally{
            if (input != null){
                input.close();
        }}
        System.out.println( "Application version : " + pro.getProperty("Org.exemple.demo.version" , "?"));
    }
}

只需返回存储在info.proerties Org.exemple.demo.version = 1.0变量中的值-在这种情况下-select @process from [dbo].[BillingSheet] where id=@id

如果您有多个具有相同数据类型的列，并且想要选择要从中选择的列，则可以使用大小写：

@process

请注意，case表达式必须从其所有分支中返回相同的数据类型，因此，如果列的数据类型不同，则必须将其转换为最适合您需要的数据类型。

Answer 2

您需要构建动态sql并执行它。

declare @process varchar(50) ,@id int, @TrackingID INT
set @id=11
set @process='PRODUCTION'

DECLARE @SqlText  nvarchar(max)
SET @SqlText  = 'update Tracking 
set TargetbyHour = (
    (
        select cast(replace(costbyhour, ''.'','''')/1 as integer) 
        from Tracking 
        where  trackingid = @TrackingID
    ) /    
    (
        (select  ' + QUOTENAME(@process) + '
         from [dbo].[BillingSheet] 
         where  id=@id
        )
    )  
)    
where  TrackingID=@TrackingID'

DECLARE @paramlist  nvarchar(max)
SET @paramlist  = '@TrackingID INT,
                @id INT'


EXEC sp_executesql @SqlText, @paramlist, 
                @TrackingID ,
                @id

Answer 3

您不需要动态SQL，请参见

DECLARE @process VARCHAR(50) = 'PRODUCTION';
DECLARE @id INT  = 11;
DECLARE @cost FLOAT;

SELECT
            @cost = [Cost]
    FROM
            (
            SELECT
                        [Id],
                        [PRODUCTION],
                        [DEV],
                        [TEST]
                FROM
                        [dbo].[BillingSheet]
            ) P
        UNPIVOT
            (
                [Cost] FOR [Process] IN ([PRODUCTION],[DEV],[TEST])
            ) UP
    WHERE
            [Id] = @Id
        AND
            [Process] = @process;

UPDATE [Tracking] 
    SET
        [TargetbyHour] = CAST(REPLACE([costbyhour], '.','')/1 AS INT) / @cost
    FROM
            [Tracking] 
    WHERE
            [trackingid] = @TrackingID;

这种方法UNPIVOT是[dbo].[BillingSheet]，因此可以使用常规'PRODUCTION'提取WHERE值。

我想在SQL Server Storedprocedure中传递参数选择查询

3 个答案: