oracle vb.net数据集填充

Question

这段代码有什么问题？ 没有错误，但没有结果。我的DataGridView_sent没有被填充。

Dim objConn As New System.Data.OracleClient.OracleConnection 
Dim objCmd As New System.Data.OracleClient.OracleCommand 
Dim dtAdapter As New System.Data.OracleClient.OracleDataAdapter 

Dim ds As New DataSet 
Dim strConnString, strSQL As String 

strConnString = "Data Source=db;User Id=user;Password=pass;" 
strSQL = "select * from table where sentdate between '" & date1 & "' and '" & date2 & "'" 

objConn.ConnectionString = strConnString 
With objCmd 
    .Connection = objConn 
    .CommandText = strSQL 
    .CommandType = CommandType.Text 
    End With 
    dtAdapter.SelectCommand = objCmd 

    dtAdapter.Fill(ds) 
    DataGridView_sent.DataSource = ds 

    dtAdapter = Nothing 
    objConn.Close() 
    objConn = Nothing 

Answer 1

这可能是由错误的日期表示引起的。
您应该使用参数化查询，并让Oracle提供在“DS”的正确模式的日期字段值

.... 
strSQL = "select * from table where sentdate between :date1 and :date2" 
objConn.ConnectionString = strConnString 
With objCmd 
    .Connection = objConn 
    .CommandText = strSQL 
    .CommandType = CommandType.Text 
    .Parameters.AddWithValue(":date1", Convert.ToDateTime(date1)); 
    .Parameters.AddWithValue(":date2", Convert.ToDateTime(date2)); 
End With 
dtAdapter.SelectCommand = objCmd 
.....