C＃將數據從ODBC數據庫傳輸到本地SQL數據庫

Question

我已經通過ODBC連接連接到數據庫。 數據在服務器上，我具有適當的權限和用戶名/密碼。

我正在嘗試將某些數據導入本地SQL數據庫（.mdf）。 我懷疑我的SQL語句錯誤。

這個想法是，當從listBox中選擇一項時，數據將被下載到SQL數據庫中。 這完全停止了我項目的任何進展。 請幫忙！！！

    public partial class frmNorth : Form
    {
            // variables for the connections 
            private OdbcConnection epnConnection = new OdbcConnection();
            private SqlConnection tempDbConnection = new SqlConnection();
    public frmNorth()
    {
        InitializeComponent();
        // This is for the ePN DB
        epnConnection.ConnectionString = @"Dsn=ePN; uid=username; pwd=myPa$$Word";
        // This is for the local DB
        tempDbConnection.ConnectionString = @"Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename=|DataDirectory|\TempDB.mdf;Integrated Security=True";
    }
    private void lbxFSR_SelectedIndexChanged(object sender, EventArgs e)
    {
        try //For ePN
        {
            //This is where I need the help <--------------------
            epnConnection.Open();
            tempDbConnection.Open();
            OdbcCommand epnCommamd = new OdbcCommand();
            epnCommamd.Connection = epnConnection;
            string epnQuery =   "INSERT INTO " + tempDbConnection + ".tblTemp (FNCL_SPLIT_REC_ID, PROJ_ID, SALES_SRC_PRC) " +
                                "SELECT PROJ_FNCL_SPLIT.FNCL_SPLIT_REC_ID,PROJ_FNCL_SPLIT.PROJ_ID,PROJ_FNCL_SPLIT.SALES_SRC_PRC " + 
                                "FROM " + epnConnection + ".PROJ_FNCL_SPLIT " + 
                                "WHERE PROJ_ID=" + lbxFSR.Text + "";
            epnCommamd.CommandText = epnQuery;
            epnCommamd.CommandTimeout = 0;
            epnCommamd.ExecuteNonQuery();

            epnConnection.Close();
            tempDbConnection.Close();
        }
        catch (Exception ex)
        {
            epnConnection.Close();
            tempDbConnection.Close();
            MessageBox.Show("Error " + ex);
        }
    }
    }

這是我得到的錯誤。 該錯誤發生在epnCommamd.ExecuteNonQuery（）;處。

錯誤消息的圖片

Answer 1

我無法發表評論，因為我沒有足夠的分數，所以我必須在答案中回答這個問題，但實際上您的兩個連接都打開嗎？ 我還要避免在此處的連接字符串中顯示密碼。

Answer 2

問題在於，通常無法以嘗試的方式使用另一數據庫上表的SELECT將INSERT插入一個表。 如果源表和目標表在同一數據庫服務器上（例如，在Sql Server上），則可以在INSERT INTO db1.SourceTable ... SELECT ... FROM db2.DestinationTable 。

但是，由於在ODBC連接上有源表，而在Sql連接上有目標表，所以這是行不通的。

您需要分兩個步驟進行操作。 將ODBC表下載到C＃ DataTable ，然后將C＃ DataTable上傳到Sql Server表中。 我無法針對您的數據庫進行測試，但是我已經在Microsoft Access數據庫和Sql Server數據庫之間的傳輸上測試了此代碼的版本

private void lbxFSR_SelectedIndexChanged(object sender, EventArgs e)
{
    try //For ePN
    {
        //This is where I need the help <--------------------

        // Break the operation into two parts
        // The ODBC & SQL databases can't talk directly to each other.

        // 1. Download ODBC table into your C# DataTable

        DataTable dt;
        epnConnection.Open();
        string epnQuery =   "SELECT FNCL_SPLIT_REC_ID, PROJ_ID, SALES_SRC_PRC " + 
                            "FROM PROJ_FNCL_SPLIT " + 
                            "WHERE PROJ_ID='" + lbxFSR.Text + "'";
        OdbcCommand epnCommamd = new OdbcCommand(epnQuery, epnConnection);
        epnCommamd.CommandTimeout = 0;
        OdbcDataReader dr = epnCommamd.ExecuteReader();
        dt.Load(dr);
        epnConnection.Close();

        // 2. Upload your C# DataTable to the SQL table

        // This select query tells the SqlDataAdapter what table you want to work with, on SQL database
        // The WHERE 0 = 1 clause is to stop it returning any rows, 
        // however you still get the column names & datatypes which you need to perform the update later
        string selectQuery = "SELECT FNCL_SPLIT_REC_ID, PROJ_ID, SALES_SRC_PRC " +
                            " FROM PROJ_FNCL_SPLIT WHERE 0 = 1";
        tempDbConnection.Open();
        var da = new SqlDataAdapter(selectQuery, tempDbConnection);
        var commandBuilder = new SqlCommandBuilder(da);
        // The DataAdapter's `Update` method applies the contents of the DataTable `dt` to the table specified in the `selectQuery`.
        // It does this via the SqlCommandBuilder, which knows how to apply updates to a Sql Database.
        da.Update(dt);                                      // Channel the C# DataTable through the DataAdapter
        tempDbConnection.Close();
    }
    catch (Exception ex)
    {
        epnConnection.Close();
        tempDbConnection.Close();
        MessageBox.Show("Error " + ex);
    }
}