使用清单框项目作为参数来获取数据库记录
it1352
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问题说明
大家好.我需要从数据库中获取在清单列表中已检查的项目的ID.请帮忙！
Hi yall. I need to fetch the ids of the items that have been checked in a checkedlistbox from the database. Please help!
dbparamcollection param =new dbparamcollection(); stringbuilder cmd =new stringbuilder(select id from table where item like @rice); foreach(object item in checklistbox1.checkeditems) { param.add(new dbparameter("@rice", item) ); } datatable sub=helper.executedatatable(cmd.tostring, param);它不起作用任何想法.我使用的是dbparameter而不是sqlparam
its not working any ideas. Am using dbparameter not sqlparam
正确答案
#1
您自己覆盖了这些参数.仅使用最后一个.
尝试使用从表中(@params)中的项目中选择ID"，并将参数构建为带引号的字符串列表(``p1''，``p2''....")
您可能仅限于IN子句中的元素数(256吗?)
You are overriding the parameters yourself. Only the last one will be used.
Try using "select id from table where item in (@params)" and build params as list of quoted strings (" ''p1'',''p2''.... ")
You might be limited to the number of elements in IN clause (256 ?)
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