OdbcConnection.GetSchema("TABLES");不工作 [英] OdbcConnection.GetSchema("TABLES"); not working

问题描述

我猜并不是所有的 SQL 都是平等创建的.我正在深入研究 C# 中的 DSN 和 ODBC 驱动程序的世界，并对其进行了一些尝试.我正在尝试获取由 DSN 定义的数据库中的所有表，我所知道的只是使用 Transoft ODBC 驱动程序.我可以连接到它并使用代码取回表:

I am guessing that not all SQL is created equally. I am diving into the world of DSNs and ODBC drivers in c# and having a bit of a go at it. I am trying to get all the tables in a database that is defined by a DSN that all I know about it is using a Transoft ODBC driver. I can connect to it and get back tables using the code:

 public void ConnectToData(String dsn)
    {
        System.Data.Odbc.OdbcConnection conn =
            new System.Data.Odbc.OdbcConnection();

        //conn.ConnectionString = "FIL=MS Access;DSN=" + dsn;
        conn.ConnectionString = "DSN=" + dsn; //dsn equals "Company_Shared"
        try
        {
            conn.Open();
            MessageBox.Show("Connected!");
            lstBoxLogs.Items.Add("Connected");                                
            DataTable tableschema = conn.GetSchema("TABLES");
            DataSet set = tableschema.DataSet;  
            // first column name
            for (int i = 0; i < tableschema.Columns.Count; i++)
            {
                lstBoxLogs.Items.Add(tableschema.Columns[i].ColumnName);
            }

            lstBoxLogs.Refresh();
            MessageBox.Show(tableschema.Columns.Count + " tables found");
        }
        catch (Exception ex)
        {
            MessageBox.Show("Failed to connect to data source: " + ex.GetBaseException().Message);
        }
        finally
        {
            conn.Close();
        }
    }

它连接良好，并报告表但不是我知道我在数据库中查找的表返回如下:

It connects fine, and reports tables but not the tables I know I am looking for in the database what comes back is the following:

TABLE_QUALIFIERTABLE_OWNERTABLE_NAMETABLE_TYPE备注

我不确定如何从这些信息中获取实际的表名，所以我可以转储每个表中的所有数据(这就是我想要做的).这是因为我必须阅读 transoft 数据库使用什么样的 SQL 并且它是否使 conn.GetSchema("TABLES"); 调用无用?

I am not sure how to get the actual table names from this information so I can just dump all the data in every table (This is all I want to do). Is this cause I have to read up on what kind of SQL a transoft database uses and does it render the conn.GetSchema("TABLES"); call useless?

推荐答案

这行得通吗?

using(DataTable tableschema = conn.GetSchema("TABLES"))
{
    // first column name
    foreach(DataRow row in tableschema.Rows)
    {
        lstBoxLogs.Items.Add(row["TABLE_NAME"].ToString());
    }
}

修复了不使用数据集的代码.

Fixed the code to not use the DataSet.

编辑:为未来的读者更新了代码，以实现处理 DataTable 的最佳实践.

Updated the code for future readers to implement the best practice of disposing of the DataTable.

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