从OleDbDataReader获取值

本文关键字：获取 OleDbDataReader | 更新日期: 2023-09-27 18:19:03

我想知道是否有可能从OleDbdataReader检索特定值。

例如，我从有100行10列的excel表中导入数据。然后我想让阅读器从指定行的所有列中获取值。假设我有一个文本框，将随机数(85)放入其中，阅读器在第一列中找到这个数字并相应地读取所有列的值。

是的，如果可能的话，你能提供一些指导如何做到这一点吗?

到目前为止，我只设法让读者读取所有的值。

主要思想是通过改变文本框中的值，读者将应用不同的值集到方法中。链接到excel表格中的图片，使其更清楚:

https://imagizer.imageshack.us/v2/505x318q90/743/YIVGVf.jpg 

    private void button1_Click(object sender, EventArgs e)
    {
        Model ThisModel = new Model();
        Beam ThisBeam = new Beam();
        OleDbConnection conn = new OleDbConnection();
        const string excelConnString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=@1;";
        const string connStringExtras = @"Extended Properties=""Excel 8.0;HDR=Yes;Imex=1""";
        conn.ConnectionString = excelConnString.Replace("@1", "C:''Users''Andrejs''Desktop''API2.xls;") + connStringExtras;
        try
        {
            conn.Open();
            OleDbCommand cmd = new OleDbCommand("SELECT A, B, C, D, E, F "+
                "FROM [SHEET1$]", conn);
            OleDbDataReader reader = cmd.ExecuteReader();
            while (reader.Read())
            {
                double X = (double)reader.GetValue(1);
                double Y = (double)reader.GetValue(2);
                CreatePadFooting(X, Y);
            }
        }
            catch
            {
            }
        ThisModel.CommitChanges();
    }
    private static void CreatePadFooting(double X, double Y)
    {
        Beam PadFooting1 = new Beam();
        PadFooting1.Name = "FOOTING";
        PadFooting1.Profile.ProfileString = "200*200";
        PadFooting1.Material.MaterialString = "K30-2";
        PadFooting1.Class = "8";
        PadFooting1.StartPoint.X = X;
        PadFooting1.StartPoint.Y = Y;
        PadFooting1.StartPoint.Z = 0.0;
        PadFooting1.EndPoint.X = X;
        PadFooting1.EndPoint.Y = Y;
        PadFooting1.EndPoint.Z = -500.0;
        PadFooting1.Position.Rotation = Position.RotationEnum.FRONT;
        PadFooting1.Position.Plane = Position.PlaneEnum.MIDDLE;
        PadFooting1.Position.Depth = Position.DepthEnum.MIDDLE;
        PadFooting1.Insert();
    }
    }
}

从OleDbDataReader获取值

您需要一个If语句来比较第一列的值，然后从Reader中读取。像这样插入一个If语句:

double randomValue = Convert.ToDouble(txtBoxRandomValue.Text); //get value to match and convert to double
try
    {
        conn.Open();
        OleDbCommand cmd = new OleDbCommand("SELECT A, B, C, D, E, F "+
            "FROM [SHEET1$]", conn);
        OleDbDataReader reader = cmd.ExecuteReader();
        while (reader.Read())
        {
        if (randomValue == Convert.ToDouble(reader.GetValue(0))) //checking here the first column
         {
            double X = (double)reader.GetValue(1);
            double Y = (double)reader.GetValue(2);
            CreatePadFooting(X, Y);
         }
       }
    }
        catch
        {
        }
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