Question

嘿伙计们，我正在研究这个查询，以便从vb.net 3.5网站上的sql 2008数据库中导出一些数据。我在初始查询后使用动态linq根据日期，州，国家，专业和医院从属关系过滤结果。

每个过滤器在查询中都有一个奇异值。医院关联除外，其中有逗号分隔列表。例如：OSUMC，Hospital West，Hopsital East

过滤时，我需要做一个.Contains来查看逗号分隔列表是否包含特定的医院。例如：（OSUMC，HospitalWest，Hospital East）.contains（“OSUMC”）

如果我对Date，State，Country和Specialty进行过滤，则查询运行完全正常。但是，如果我添加一个针对医院联盟的过滤器，它是一个.Contains（）过滤器，那么我会得到超时错误。

Timeout expired.  The timeout period elapsed prior to completion of the operation or the server is not responding.

描述：在执行当前Web请求期间发生了未处理的异常。请查看堆栈跟踪以获取有关错误及其源自代码的位置的更多信息。

异常详细信息： System.Data.SqlClient.SqlException：超时已过期。操作完成之前经过的超时时间或服务器没有响应。

Dim ctx As New OSUMCEntities
    Dim query = (From ca As OSUMCModel.vw_ConferenceAttendance In ctx.vw_ConferenceAttendance Select New With _
                                                                                                     { _
                                                                                                         .LastName = ca.LastName, _
                                                                                                         .FirstName = ca.FirstName, _
                                                                                                         .UserID = ca.UserID, _
                                                                                                         .UserName = ca.Username, _
                                                                                                         .Degree = ca.DegreeName, _
                                                                                                         .Specialty = ca.Specialty, _
                                                                                                         .Profession = ca.Profession, _
                                                                                                         .HospitalAffiliations = ca.HospitalAffiliations, _
                                                                                                         .Address1 = ca.MailingAddress1, _
                                                                                                         .Address2 = ca.MailingAddress2, _
                                                                                                         .City = ca.MailingCity, _
                                                                                                         .State = ca.MailingState, _
                                                                                                         .ZipPostal = ca.MailingZip, _
                                                                                                         .Country = ca.MailingCountry, _
                                                                                                         .ConferenceID = ca.ConfID, _
                                                                                                         .Title = ca.Title, _
                                                                                                         .Date = ca.StartDate, _
                                                                                                         .MaxCredits = ca.Credits, _
                                                                                                         .CreditsAwarded = ca.CreditHours, _
                                                                                                         .CreditsAssignedOn = ca.AssignedOn, _
                                                                                                         .LastUpdated = ca.LastUpdate _
                                                                                                     })
    If (txtDateStart.Text <> "" And txtDateEnd.Text <> "") Then
        Dim StartDate As Date = txtDateStart.Text
        Dim EndDate As Date = txtDateEnd.Text
        query = query.Where("(Date >= @0 And  Date <=@1)", StartDate, EndDate)
    ElseIf (txtDateStart.Text <> "") Then
        Dim StartDate As Date = txtDateStart.Text
        query = query.Where("Date >= @0", StartDate)
    ElseIf (txtDateEnd.Text <> "") Then
        Dim EndDate As Date = txtDateEnd.Text
        query = query.Where("Date <= @0", EndDate)
    End If
    If (ddlState.SelectedValue <> "Export All") Then
        query = query.Where("State = @0", ddlState.SelectedValue)
    End If
    If (ddlCountry.SelectedValue <> "Export All") Then
        query = query.Where("Country = @0", ddlCountry.SelectedValue)
    End If
    If (ddlSpecialty.SelectedValue <> "Export All") Then
        query = query.Where("Specialty = @0", ddlSpecialty.SelectedValue)
    End If
    If (ddlHospitals.SelectedValue <> "Export All") Then
        Dim Hospital As String = ddlHospitals.SelectedValue
        query = query.Where("HospitalAffiliations.Contains(@0)", Hospital)
    End If

Answer 1

分析Linq在sql server中执行的查询，并检查sql profiler中的时间。

动态LINQ .Contains（）引发超时过期。错误

1 个答案: