Execute Parameterized SQL StoredProcedure via ODBC

问题:

From within a C# WinForms app I must execute a parameterized Stored Procedure on a MS SQL Express Server. The Database Connection works, the Procedure works either, but I get an Error Message:

42000: Missing Parameter '@KundenEmail'

although I'm sure I added the parameter correctly. Maybe some of you could have a look - I don't know what to search for any more...

OdbcConnection ODBCConnection = new OdbcConnection();

try
{
    ODBCConnection.ConnectionString = ODBCConnectionString;
    ODBCConnection.Open();
}
catch (Exception DatabaseConnectionEx)
{
    if (ODBCConnection != null)
        ODBCConnection.Dispose();

    // Error Message

    return null;
}

OdbcParameter ODBCParameter = new OdbcParameter("@KundenEmail", OdbcType.NChar, 50);
ODBCParameter.Value = KundenEmail;

OdbcCommand ODBCCommand = new OdbcCommand("getDetailsFromEmail", ODBCConnection);
ODBCCommand.CommandType = CommandType.StoredProcedure;
ODBCCommand.Parameters.Add(ODBCParameter);

DataTable DataTable = new DataTable();

OdbcDataAdapter ODBCDatadapter = new OdbcDataAdapter(ODBCCommand);
ODBCDatadapter.Fill(DataTable);
ODBCDatadapter.Dispose();

ODBCConnection.Close();
ODBCConnection.Dispose();

This is the error message I get:

ERROR [4200][Microsoft][ODBC SQL Server]The Procedure or method 'getDetailsFromEmail' expects the '@KundenEmail'-parameter, which was not supplied.

Ah, I missed the connection string

private static String ODBCConnectionString = "Driver={SQL Server};Server=TESTSRV\\SQLEXPRESS;Database=TestDatabase;";

Any ideas? Thanks in advance.

回答1:

Well - I now managed to solve the problem on my own, with some help from the MSDN-documentation.

The correct statement to execute a stored procedure via ODBC is as follows:

OdbcCommand ODBCCommand = new OdbcCommand("{call getDetailsFromEmail (?)}", ODBCConnection);
ODBCCommand.CommandType = CommandType.StoredProcedure;
ODBCCommand.Parameters.AddWithValue("@KundenEmail", KundenEmail);

Nevertheless - thanks for your help Thorsten.

回答2:

How To Execute SQL Parameterized Stored Procedures by Using the ODBC .NET Provider and Visual C# .NET

While executing a parameterized stored procedure using the ODBC .NET Provider is little different from executing the same procedure using the SQL or the OLE DB Provider, there is one important difference: the stored procedure must be called using the ODBC CALL syntax rather than the name of the stored procedure.

Call Syntax Examples

Here is an example of the call syntax for an stored procedure that expects one input parameter:

{CALL CustOrderHist (?)}

Here is an example of the call syntax for a stored procedure that expects one input parameter and returns one output parameter and a return value. The first placeholder represents the return value:

{? = CALL Procedure1 (?, ?)

Sample Code

    public static void SheduleDocuments(int siteid, int docid)
    {

        DataTable objDt = new DataTable();
        OdbcConnection odbccon = new OdbcConnection();
        try
        {
            odbccon.ConnectionString =
             "Dsn=Dsn;" +
             "Uid=databaseuserid;" +
             "Pwd=databasepassword;";
            odbccon.Open();

            OdbcCommand cmd = new OdbcCommand("{call usp_GetEmpDetailsByIDanddepid(?,?)", odbccon);
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.Parameters.AddWithValue("@siteid", siteid);
            cmd.Parameters.AddWithValue("@DocumentIDs", docid);
            cmd.ExecuteNonQuery();
        }
        catch (OdbcException objEx)
        {
            string str = objEx.Message;
        }
        finally { odbccon.Close(); }
    }

回答3:

Anyway it's better your code would look like this:

using (OdbcConnection connection = new OdbcConnection(connectionString) )
using (OdbcCommand command = connection.CreateCommand())
{
    command.CommandText = commandText;
    command.CommandType = CommandType.StoredProcedure;

    command.Parameters.Add("@KundenEmail", OdbcType.NChar, 50).Value = KundenEmail

    DataTable dataTable = new DataTable();

    connection.Open();

    using (OdbcDataAdapter adapter = new OdbcDataAdapter(command))
    {
        adapter.Fill(dataTable);
    }
}

But rather better to use SqlConnection/SqlCommand/SqlDataAdapter instead of ODBC types. Syntax will be still the same.

回答4:

Don't use ODBCConnection to connect to a SQL Server. Use the "normal" SqlConnection, SqlCommand, etc. These are the ones made to work with SQL Server.

EDIT: Also, you should use the SqlConnectionStringBuilder to assembly the connection string. This is far less error prone than putting the entire connection string into a configuration file or creating it by hand.

回答5:

 private void button1_Click(object sender, EventArgs e)
 {
    OdbcCommand cmd = new OdbcCommand(" call prc_st(?)",con);
    cmd.Parameters.Add(new OdbcParameter("@id", "1"));
    cmd.CommandType = CommandType.StoredProcedure;
    OdbcDataAdapter adp = new OdbcDataAdapter(cmd);
    DataSet ds = new DataSet();
    adp.Fill(ds);

 }