在 C# 中加载数据 infile 查询时出错

Question

以下代码有问题：-

 private void btnUpload_Click(object sender, EventArgs e)
    {

        string nm = txtFilename.Text;
        string qry = "LOAD DATA INFILE 'D:\\HHTFiles\\" + nm + "' INTO TABLE `table1`.`location`FIELDS TERMINATED BY '-->'LINES TERMINATED BY '\r\n'(Barcode,BinLoc);";
        cmd = new OdbcCommand(qry, con);
        int i = cmd.ExecuteNonQuery();
        if (i > 0)
        {
            MessageBox.Show(" File loaded successfully...");
        }


    }

private void btnBrowse_Click(object sender, EventArgs e)
    {
        OpenFileDialog openfiledailog1 = new OpenFileDialog();
        openfiledailog1.InitialDirectory = "D:\\HHTFiles\\";
        openfiledailog1.Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.*";
        openfiledailog1.FilterIndex = 2;
        openfiledailog1.RestoreDirectory = true;

        if (openfiledailog1.ShowDialog() == DialogResult.OK)
        {
            try
            {
                if ((openfiledailog1.OpenFile()) != null)
                {

                     txtFilename.Text = openfiledailog1.SafeFileName.ToString();

                }
            }
            catch (Exception ex)
            {
              MessageBox.Show("Error: Could not read file from disk. Original error: "      + ex.Message);
            }
        }
    }

如果我在查询中给出完整的文件路径，它可以正常运行：- string qry = "LOAD DATA INFILE 'D:\HHTFiles\ ABC.txt' INTO TABLE table1.locationFIELDS TERMINATED BY '-->'LINES TERMINATED BY '\r\n'(Barcode,BinLoc);" ; 但是当文件路径以字符串变量传递时会引发错误。

错误：- 错误 [HY000] [MySQL][ODBC 5.1 驱动程序][mysqld-5.1.48-community] 找不到文件 'D:HHTFilesABC.txt' (Errcode: 2)

Answer 1

@Aghilas 它得到了解决 :) 虽然我不确定为什么我首先会出错。无论如何，我只是将 '\\' 替换为 '/' 并且运行良好。

        string nm = txtFilename.Text;
        StringBuilder stringBuilder = new StringBuilder();
        stringBuilder.Append("LOAD DATA INFILE ");
        stringBuilder.Append(Path.Combine("'D:/HHTFiles/", nm));
        stringBuilder.Append("' INTO TABLE `table1`.`location`FIELDS TERMINATED BY '-->'LINES TERMINATED BY '\r\n'(Barcode,BinLoc);");

Answer 2

尝试使用 Path.Combine

Path.Combine("D:\\HHTFiles\\", nm); 

并使用 StringBuilder 来构建您的查询

 StringBuilder stringBuilder = new StringBuilder();
 stringBuilder.Append("LOAD DATA INFILE ");
 stringBuilder.Append(Path.Combine("D:\\HHTFiles\\", nm));
 stringBuilder.Append(" INTO TABLE table1.location");
 stringBuilder.Append(" FIELDS TERMINATED BY '-->'"); 
 stringBuilder.Append(" LINES TERMINATED BY (");              
 stringBuilder.Append(Barcode.BinLoc);
 stringBuilder.Append(")");

 string qry = stringBuilder.ToString();