Question

我将一个sql语句写入vb.net以从msaccess获取数据，其中date等于patepicker控件。但这里语法错误。我的代码如下： -

 Dim ct As String = "select * from add_student where _Date <= #" & dtDate1.ToString("MM/dd/yyyy") & "#"
        cmd = New OleDbCommand(ct)
        cmd.Connection = con
        rdr = cmd.ExecuteReader()

注意： - _Date列在ms访问数据库中具有日期/时间数据类型请建议我，哪里是错误

Answer 1

您应该始终使用参数：

dim sqlQuery ="Select * from add_student where _Date = ?"
using conn = New OleDbConnection("connectionstring")
    conn.open()
    Using selectCmd As New OleDbCommand(sqlQuery, conn)
        selectCmd.Parameters.Add("_Date", OleDbType.Date).Value = dtDate1
        using rdr = selectCmd.ExecuteReader()
            while rdr.read()

            End While
        End Using
    End Using
End Using

Answer 2

您的问题可能是＆＃34; /＆＃34;不是斜杠，而是本地化的日期分隔符。

因此，强制斜线：

Dim ct As String = "select * from add_student where _Date <= #" & dtDate1.ToString("MM'/'dd'/'yyyy") & "#"

并且可能是奇怪字段名称的括号：

Dim ct As String = "select * from add_student where [_Date] <= #" & dtDate1.ToString("MM'/'dd'/'yyyy") & "#"

检查日期是否存在于vb.net中

2 个答案: