基于 sql 中参数值的动态 Where 条件

Question

我正在做一个搜索条件表，因为我有各种类型的搜索选项，而不是在基于控件 select 的代码中做一个 If 条件，我们可以检查参数值并更新其中条件

Declare @Amount varchar(Max);
SET @Amount= 'and Amount=500';
Select Processor, [Stmt Date], Description, Amount, [Allocation Date],
Entity, URN, [Customer Acc], [Invoice Number],Lamount, DumpEntity as [Received Entity] 
from tbl_Employee_Salary 
WHERE 1=1 +CONVERT(int,CASE  when @Amount IS NOT null then @Amount  Else ' ' END)

Conversion failed when converting the varchar value 'and Amount=500' to data type int.

Answer 1

警告：这完全未经测试。

我讨厌这些类型的查询，但你所追求的是这样的。下面我就不解释了，不好意思，还是看你自己看懂了，支持一下。这称为 catch-all 查询或 kitchen sink 查询。

--All below datatypes are ASSUMED
--Declare a variable for every column (you won't need all of these if they aren't going to all be used)
DECLARE @Processor varchar(50),
        @StmtDate date,
        @Description varchar(100),
        @Amount int,
        @AllocationDate date,
        @Entity int,
        @URN int,
        @CustomerAcc int,
        @InvoiceNumber int,
        @Lamount decimal(10,2),
        @DumpEntity varbinary(8);
--Set your values here (I assume this will actually be an SP or something)
SET @Amount = 500;

--Create the initial SQL statement
DECLARE @SQL nvarchar(MAX);
SET @SQL = N'SELECT Processor,' + NCHAR(13) + NCHAR(10) +
           N'       [Stmt Date],' + NCHAR(13) + NCHAR(10) +
           N'       Description,' + NCHAR(13) + NCHAR(10) +
           N'       Amount,' + NCHAR(13) + NCHAR(10) +
           N'       [Allocation Date],' + NCHAR(13) + NCHAR(10) +
           N'       Entity,' + NCHAR(13) + NCHAR(10) +
           N'       URN,' + NCHAR(13) + NCHAR(10) +
           N'       [Customer Acc],' + NCHAR(13) + NCHAR(10) +
           N'       [Invoice Number],' + NCHAR(13) + NCHAR(10) +
           N'       Lamount,' + NCHAR(13) + NCHAR(10) +
           N'       DumpEntity AS [Received Entity]' + NCHAR(13) + NCHAR(10) +
           N'FROM tbl_Employee_Salary'

--Now you need to start creating the WHERE
DECLARE @Where nvarchar(MAX);

SET @Where = N'WHERE ' +
             NULLIF(STUFF(CASE WHEN @Processor IS NOT NULL THEN NCHAR(13) + NCHAR(10) + N'  AND Processor = @Processor' ELSE N'' END + 
                          CASE WHEN @StmtDate IS NOT NULL THEN NCHAR(13) + NCHAR(10) + N'  AND [Stmt Date] = @StmtDate' ELSE N'' END + 
                          CASE WHEN @Description IS NOT NULL THEN NCHAR(13) + NCHAR(10) + N'  AND [Description] = @Description' ELSE N'' END + 
                          CASE WHEN @Amount IS NOT NULL THEN NCHAR(13) + NCHAR(10) + N'  AND Amount = @Amount' ELSE N'' END + 
                          CASE WHEN @AllocationDate IS NOT NULL THEN NCHAR(13) + NCHAR(10) + N'  AND [Allocation Date] = @AllocationDate' ELSE N'' END + 
                          CASE WHEN @Entity IS NOT NULL THEN NCHAR(13) + NCHAR(10) + N'  AND Entity = @Entity' ELSE N'' END + 
                          CASE WHEN @URN IS NOT NULL THEN NCHAR(13) + NCHAR(10) + N'  AND URN = @URN' ELSE N'' END + 
                          CASE WHEN @CustomerAcc IS NOT NULL THEN NCHAR(13) + NCHAR(10) + N'  AND [Customer Acc] = @CustomerAcc' ELSE N'' END + 
                          CASE WHEN @InvoiceNumber IS NOT NULL THEN NCHAR(13) + NCHAR(10) + N'  AND [Invoice Number] = @InvoiceNumber' ELSE N'' END + 
                          CASE WHEN @Lamount IS NOT NULL THEN NCHAR(13) + NCHAR(10) + N'  AND Lamount = @Lamountcessor' ELSE N'' END + 
                          CASE WHEN @DumpEntity IS NOT NULL THEN NCHAR(13) + NCHAR(10) + N'  AND DumpEntity = @DumpEntity' ELSE N'' END,1,8,N''),N'');
--Now add the 2 values together
SET @SQL = @SQL + ISNULL(@Where,N'') + N';';

--Create the parameter string
DECLARE @Params nvarchar(MAX);
--All following datatypes are ASSUMED
SET @Params = N'@Processor varchar(50),@StmtDate date,@Description varchar(100),@Amount int,@AllocationDate date, @Entity int,@URN int,@CustomerAcc int,@InvoiceNumber int,@Lamount decimal(10,2),@DumpEntity varbinary(8)'

PRINT @SQL; --Your debugging best friend

--And execute the dynamic SQL
EXEC sp_executesql @SQL, @Params, @Processor, @StmtDate, @Description ,@Amount, @AllocationDate ,@Entity, @URN , @CustomerAcc, @InvoiceNumber, @Lamount, @DumpEntity;
GO

祝你好运！

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