sql - 在 SQL 语句中构建动态 where 条件

Question

我想根据存储过程输入构建自定义 Where 条件，如果不是 null 则我将在语句中使用它们，否则我不会使用它们。

if @Vendor_Name is not null
    begin 

    set @where += 'Upper(vendors.VENDOR_NAME) LIKE "%"+ UPPER(@Vendor_Name) +"%"'

    end
    else if @Entity is not null
    begin
    set @where += 'AND headers.ORG_ID = @Entity'
    end
select * from table_name where @where

但我收到这个错误

An expression of non-boolean type specified in a context where a condition is expected, near 'set'.

Answer 1

用这个 :

Declare @Where NVARCHAR(MAX) 

...... Create your Where

DECLARE @Command NVARCHAR(MAX) 
Set @Command = 'Select * From SEM.tblMeasureCatalog AS MC ' ;

If( @Where <> '' )
   Set @Comand = @Command + ' Where ' + @Where

Execute SP_ExecuteSQL  @Command

我测试了这个并且它有效