How to Effectively Update an OleDb Table Using Parameters?

How to Update a Table Using OleDb Parameters

When updating a database table with OleDb, you may encounter issues where the field values are not being updated despite passing the values as parameters. To resolve this, OleDb parameters can be utilized, even though OleDb does not explicitly support named parameters.

Instead, OleDb allows you to pass parameters as variables and reference them in the SQL query string. This technique ensures that the values are assigned to the correct fields in the database.

Example Code:

using (OleDbConnection conn = new OleDbConnection(connString))
{
    conn.Open();
    OleDbCommand cmd = conn.CreateCommand();

    // Create OleDbParameters for each field
    OleDbParameter paramMName = new OleDbParameter("@MName", customer.MName);
    OleDbParameter paramDesc = new OleDbParameter("@Desc", customer.Desc);

    // Add parameters to command object
    cmd.Parameters.Add(paramMName);
    cmd.Parameters.Add(paramDesc);

    // Construct SQL query with parameter placeholders
    cmd.CommandText = "UPDATE Master_Accounts SET M_Name=@MName, Desc=@Desc WHERE LM_code=@LM_code";

    // Execute update using parameters
    cmd.ExecuteNonQuery();
}

By using OleDb parameters, you can reference the parameter placeholders in the SQL query and dynamically assign the desired values to the corresponding fields upon execution. This ensures that the table is updated efficiently and accurately.

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