小编Dav*_*ram的帖子

我搜索并搜索了一个答案,我找不到一个.我有一个选中的列表框,用户可以选择他们在计算机上遇到的问题.在选中的列表框中,您将看到诸如......慢,病毒,坏硬盘......以及根据他们选择的内容,我将告诉他们估计的维修费用.目前这是我构建查询的方式:

Dim mIssues As String = ""

For i = 0 To lstIssues.CheckedItemsCount - 1
 If mIssues = "" Then
  mIssues = String.Format("IssueName = '{0}'", lstIssues.CheckedItems(i))
 Else
  mIssues = String.Format("{0} OR IssueName = '{1}'", mIssues, lstIssues.CheckedItems(i))               
 End If
Next

上面的代码将查看他们选择了多少问题.如果他们只选择一个问题,那么它将返回如下字符串:IssueName ='无论他们选择什么'.如果他们选择了多个问题,它将返回如下字符串:IssueName ='无论选择何种'或IssueName ='第二个选择'.因此,如果他们选择多个问题,我会在所有选项之间附加一个OR.我这样做是为了在我的查询中动态构建我的where子句.

这是我的查询:

Dim mySQL As String = "SELECT IssueID, IssueTypeID, IssueName, IssueDescription, " _
  & "CustomerID, IndividualCost, GroupCost, Active, ChargeType " _
  & "FROM (SELECT IssueID, IssueTypeID, IssueName, IssueDescription, " _
  & "CustomerID, IndividualCost, GroupCost, Active, ChargeType " …