带有CASE表达式的动态sql

Question

   SET @SQL =
        'SELECT
        CaseStatus =
            CASE Level1Status
                WHEN 1100 THEN ''Case Submitted to QC''
                WHEN 1200 THEN ''Pending QC''
                WHEN 1400 THEN ''Passed QC''
            
            END,

我目前遇到上面的动态 sql/case 表达式的问题，因为我似乎无法将字符串放入动态 sql 中，是否有人碰巧有解决此问题的解决方案

编辑

AS 开始 声明 @SQL nvarchar(4000)

SET @SQL =
    'SELECT
    CaseStatus =
        CASE Level1Status
            WHEN 1100 THEN ''Case Submitted to QC''
            WHEN 1200 THEN ''Pending QC''
            WHEN 1400 THEN ''Passed QC''
        
        END,
        
        CaseStartDateTime,
        CaseEndDateTime,
        StatusName,
        Cell_NameDescription,
        QCAnalystName,
        AnalystName,
        Upload_Datetime,
        Requesting_Entity,
        Legal_Entity_TypeDescription,
        HighPriorityDescription,
        DD_Level_RequiredDescription,
        CountryDscr,
        Maintable.KYCCaseId AS KYCCaseId
    FROM
        UACTc75760ab10784b51b585f082d4b25223 AS MI,
        UACT175e55161660402692a53a4cdeb89bd6 AS MainTable,
        UACT5996d6e5151245cab24e4e76e3e53540 AS Statuses,
        UACTde5f05df6c5f4872a1e57b3cf8368301 AS AddressDetails
    WHERE
        (
        MI.CaseStartDateTime BETWEEN ' + quotename(convert(varchar(10), @CaseStartDateTime, 120), '''') + ' AND '  + quotename(convert(varchar(10), @CaseEndDateTime, 120), '''') +
        ' OR
        MI.CaseEndDateTime BETWEEN ' + quotename(convert(varchar(10), @CaseStartDateTime, 120), '''') +  ' AND ' + quotename(convert(varchar(10), @CaseEndDateTime, 120), '''') +
        ' )
    AND
        MI.KYCCase_Id = MainTable.KYCCaseId'
    IF @StatusName IS NOT NULL AND ltrim(rtrim(@StatusName)) != N''
        SET @SQL = @SQL + ' 
        AND
            Statuses.SourceStatus = MainTable.Level1Status
        AND
            Statuses.StatusName = ' + quotename(@StatusName, '''')
    IF @CountryDscr IS NOT NULL AND ltrim(rtrim(@CountryDscr)) != N''
    SET @SQL = @SQL + '
        AND
            AddressDetails.CountryDscr = ' + quotename(@CountryDscr, '''')      
    IF @CellDscr IS NOT NULL AND ltrim(rtrim(@CellDscr)) != N''
        SET @SQL = @SQL + ' 
        AND
            MainTable.Cell_NameDescription = ' + quotename(@CellDscr, '''') 
    IF @QCAnalystName IS NOT NULL AND ltrim(rtrim(@QCAnalystName)) != N''
        SET @SQL = @SQL + '
        AND
            MainTable.QCAnalystName = ' + quotename(@QCAnalystName, '''')   
    IF @AnalystName IS NOT NULL AND ltrim(rtrim(@AnalystName)) != N''
        SET @SQL = @SQL + '
        AND
            MainTable.AnalystName = ' + quotename(@AnalystName, '''')
    IF @RequestingEntity IS NOT NULL AND ltrim(rtrim(@RequestingEntity)) != N''
        SET @SQL = @SQL + '
        AND
            MainTable.Requesting_Entity = ' + quotename(@RequestingEntity, '''')
    IF @EntityType IS NOT NULL AND ltrim(rtrim(@EntityType)) != N''
        SET @SQL = @SQL + '
        AND
            MainTable.Legal_Entity_TypeDescription = ' + quotename(@EntityType, '''')
    IF @HighPriority IS NOT NULL AND ltrim(rtrim(@HighPriority)) != N''
        SET @SQL = @SQL + '
        AND
            MainTable.HighPriorityDescription = ' + quotename(@HighPriority, '''')
    IF @DDLevelRequired IS NOT NULL AND ltrim(rtrim(@DDLevelRequired)) != N''
        SET @SQL = @SQL + '
        AND
            MainTable.DD_Level_RequiredDescription = ' + quotename(@DDLevelRequired, '''')  

EXEC sp_executesql @SQL

这是整个代码，我得到的错误是

消息 156，第 15 级，状态 1，第 32 行
关键字“Case”附近的语法不正确。

Answer 1

这工作正常。

Create Table #Level1Status(Id int identity ,Level1Status int)

Insert INto #Level1Status(Level1Status) values(1100),(1200),(1400)


            Declare @SQL Nvarchar(Max)
            SET @SQL =
                    'SELECT 
                    CaseStatus =
                        CASE Level1Status
                            WHEN 1100 THEN ''Case Submitted to QC''
                            WHEN 1200 THEN ''Pending QC''
                            WHEN 1400 THEN ''Passed QC''

                        END from #Level1Status';
            Exec SP_ExecuteSQL @SQL

Answer 2

由于您将 @SQL 字符串与局部变量“@xxx”连接起来，万一其中任何一个可能为空，它想要给出任何输出，因此在与您使用的所有本地变量连接时使用 ISNULL() 或 COALESCE() 。