使用存储过程检查 SQL Server 数据库中是否已存在行

Question

我已经插入了两行具有相同内容的表，但搜索现有数据的代码没有返回所需的结果。

这是我的 VB.Net 代码：

Private Sub BtnSave_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnSave.Click

    Try

If DateTimePicker1.Value.Date >= DateTime.Parse(TxtDateFrom.Text) And DateTimePicker1.Value.Date <= DateTime.Parse(TxtDateTo.Text) Then


    Dim cmd1 As New SqlCommand
            cmd1 = New SqlCommand("check_sched", connection)
            cmd1.CommandType = CommandType.StoredProcedure
            Dim rd As SqlDataReader
            cmd1.Parameters.AddWithValue("@empid", Label17.Text)
            cmd1.Parameters.AddWithValue("@datesched", DateTimePicker1.Value.Date)
            cmd1.Parameters.AddWithValue("@timefrom", TimePicker1.Text)
            cmd1.Parameters.AddWithValue("@timeto", TimePicker1.Text)
            rd = cmd1.ExecuteReader()


            If rd.HasRows Then

                MsgBox("Employee already assigned a job for the particular time period", MsgBoxStyle.Information, "Change Time Period")

            Else

                Dim cmd As New SqlCommand
                cmd = New SqlCommand("insert_schedule1", connection)
                cmd.CommandType = CommandType.StoredProcedure
                cmd.Parameters.Add("@actid", SqlDbType.Int).Value = Label2.Text
                cmd.Parameters.Add("@activity", SqlDbType.NVarChar).Value = CmbActivity.Text
                cmd.Parameters.Add("@serviceid", SqlDbType.Int).Value = Label14.Text
                cmd.Parameters.Add("@servicename", SqlDbType.NVarChar).Value = TxtServiceType.Text
                cmd.Parameters.Add("@pdatefrom", SqlDbType.NVarChar).Value = TxtDateFrom.Text
                cmd.Parameters.Add("@pdateto", SqlDbType.NVarChar).Value = TxtDateTo.Text
                cmd.Parameters.Add("@deptname", SqlDbType.NVarChar).Value = Label16.Text
                cmd.Parameters.Add("@emp", SqlDbType.NVarChar).Value = CmbEmp.Text
                cmd.Parameters.Add("@empid", SqlDbType.Int).Value = Label17.Text
                cmd.Parameters.Add("@datesched", SqlDbType.DateTime).Value = myDate1
                cmd.Parameters.Add("@timefrom", SqlDbType.Time).Value = TimePicker1.Value.TimeOfDay
                cmd.Parameters.Add("@timeto", SqlDbType.Time).Value = TimePicker2.Value.TimeOfDay
                cmd.Parameters.Add("@status", SqlDbType.Int).Value = "1"
                cmd.ExecuteNonQuery()
                MsgBox("Scheduled Successfully", MsgBoxStyle.Information, "Task Schedule")
                CmbActivity.Text = ""
                TxtServiceType.Text = ""
                TxtDateFrom.Text = ""
                TxtDateTo.Text = ""
                'CmbSactivity.Text = ""
                CmbEmp.Text = ""
                DateTimePicker1.Text = Now
                TimePicker1.Text = TimeOfDay
                TimePicker2.Text = TimeOfDay
            End If
        Else
            MsgBox("Please select a date within the duration", MsgBoxStyle.Information, "Invalid Date")
        End If

    Catch ex As Exception
        MessageBox.Show(ex.Message)
    End Try
End Sub

谁能帮我找出错误？

这是我的存储过程

create procedure check_sched
    @empid int,
    @datesched datetime,
    @timefrom datetime,
    @timeto datetime
as 
begin
    SELECT * 
    FROM tbl_schedule 
    WHERE empid = @empid 
      AND datesched = @datesched 
      AND timefrom >= @timefrom 
      AND timeto <= @timeto
end

表架构：

CREATE TABLE [dbo].[tbl_schedule]
(   
     [actid] [int] NULL,    
     [activity] [nvarchar](350) NULL,   
     [serviceid] [int] NULL,    
     [servicename] [nvarchar](50) NULL,     
     [pdatefrom] [nvarchar](50) NULL,   
     [pdateto] [nvarchar](50) NULL,     
     [sactid] [int] NULL,   
     [sactivity] [nvarchar](500) NULL,  
     [deptname] [nvarchar](150) NULL,   
     [emp] [nvarchar](150) NULL,    
     [empid] [int] NULL,    
     [datesched] [datetime] NULL,   
     [timefrom] [datetime] NULL,    
     [timeto] [datetime] NULL,
     [actimefrom] [datetime] NULL,  
     [actimeto] [datetime] NULL,
     [completed] [int] NULL,    
     [status] [int] NULL 
) ON [PRIMARY]

Answer 1

您的检查计划对@timeFrom 和@timeTo 字段使用TimePicker1 值，而您的插入分别使用TimePicker1 和TimePicker2。这会导致您的支票查看错误的日期。

为避免将来出现此问题并更容易找到这些错误，请尝试重构名称以匹配它们的用途（例如 fromTimePicker 和 toTimePicker）。