Question

我正在尝试加入一串数据库值，但在此声明中：

SET @sql = ('select' + @var1 + '+' + convert(varchar,@var2) + 
            'from [VoucherType] where [DeletedBy] is null and [AutoID] = 1')

我收到错误说

数据类型nvarchar和bit在add中不兼容操作

@var2我的数据库中的[IsBirthdayVoucher]是bit类型，但我已经在其上应用了convert(varchar, @var2)。请善意地告诉我做错了什么。感谢。

SPROC：

declare @Str as varchar(max) 
declare @var1 as varchar(30)=null
declare @var2 as varchar(30)=null
declare @var3 as varchar(30)=null
declare @var4 as varchar(30)=null
declare @var5 as varchar(30)=null

declare @sql as varchar(355)

set @Str = '[Code][IsBirthdayVoucher][IsReusable]VouT' 

    Set @var1=  (select LEFT(@Str, CHARINDEX(']', @Str)))  
        set @Str = SUBSTRING(@Str, CHARINDEX(']', @Str) + 1, LEN(@Str))     
    Set @var2 =(select LEFT(@Str, CHARINDEX(']', @Str)))
        set @Str = SUBSTRING(@Str, CHARINDEX(']', @Str) + 1, LEN(@Str))         
    Set @var3 =(select LEFT(@Str, CHARINDEX(']', @Str)))  
        set @Str = SUBSTRING(@Str, CHARINDEX(']', @Str) + 1, LEN(@Str))     

    SET @sql = ('select' + @var1 + '+' + convert(varchar,@var2) + 'from [VoucherType] where [DeletedBy] is null and [AutoID] = 1')

          EXEC(@sql)

Answer 1

您未将[IsBirthdayVoucher]转换为VARCHAR，而是将@var2转换为VARCHAR。

尝试：

SET @sql = ('select ' + @var1 + ' + convert(varchar, ' + @var2 + ') from [VoucherType] where [DeletedBy] is null and [AutoID] = 1')

Answer 2

试试这个：

SET @sql = ('select CONCAT(' + @var1 + ',' + @var2 + ') from [VoucherType] where [DeletedBy] is null and [AutoID] = 1')

SQL server + dynamic query +＆＃39;数据类型nvarchar和bit在add运算符中不兼容。＆＃39;

2 个答案: