Question

T-SQL环境中动态字符串处理中的未知错误。 PS：我将不做任何转换。只想创建一个Update语句并在以后执行

代码：

DROP TABLE IF EXISTS #TEMP

Select 'CRDB_Reporting' tablename,'MagnitudePackage' updatecolumn,'String' updatecolumntype,'''XLFWH''' updatevalue,'NatureOfFundCode' primaryfilter,'String' primaryfiltertype,'''FWH''' primaryfiltervalue,NULL remainingfilter
INTO #TEMP

Select  
CASE 
WHEN remainingfilter IS NOT NULL THEN 
    'Update [dbo].[' + tablename +'] Set [' + updatecolumn +']  = ' + updatevalue + ' Where [' + primaryfilter +']  = ' + primaryfiltervalue + ' And ' + remainingfilter
WHEN remainingfilter IS NULL THEN   
    'Update [dbo].[' + tablename +'] Set [' + updatecolumn +']  = ' + updatevalue + ' Where [' + primaryfilter +']  = ' + primaryfiltervalue + ' And '
END
From #Temp

预期结果

Update [dbo].[CRDB_Reporting] Set [MagnitudePackage] = 'XLFWH' Where [NatureOfFundCode] = 'FWH'

错误消息：

消息245，级别16，状态1，第34行转换时转换失败 varchar值'Update [dbo]。[CRDB_Reporting]设置 [MagnitudePackage] ='XLFWH'其中[NatureOfFundCode] ='FWH'和' 数据类型为int。

Answer 1

创建列remainingfilter时，它具有int的隐式转换

要解决此问题，请使用...,cast(NULL as varchar(max)) remainingfilter

也就是说，我会选择 concat（）

示例

Select  Cmd = concat('Update ',quotename(tablename),' set ',quotename(updatecolumn),' = ',updatevalue,' And ' + nullif(remainingfilter,''))
From #Temp

返回

Update [CRDB_Reporting] set [MagnitudePackage] = 'XLFWH'

在SQl Server中获取“转换失败”错误

1 个答案: