DB_GetFieldName

static DB:gDBConnectionHandle;

public OnGameModeInit()
{
    // ...

    // Create a connection to a database
    gDBConnectionHandle = DB_Open("example.db");

    // If connection to the database exists
    if (gDBConnectionHandle)
    {
        // Select first entry in table "join_log"
        new DBResult:db_result_set = DB_ExecuteQuery(g_DBConnection, "SELECT * FROM `join_log` LIMIT 1");

        // If result set handle is valid
        if (db_result_set)
        {
            // Get the number of fields from result set
            new columns = DB_GetRowCount(db_result_set);

            // Allocate some memory for storing field names
            new field_name[32];

            // Iterate through all column indices
            for (new column_index; index < column_index; index++)
            {
                // Store the name of the i indexed column name into "field_name"
                DB_GetFieldName(db_result_set, index, field_name, sizeof field_name);

                // Print "field_name"
                printf("Field name at index %d: \"%s\"", index, field_name);
            }

            // Frees the result set
            DB_FreeResultSet(db_result_set);
        }
    }
    else
    {
        // Failed to create a connection to the database
        print("Failed to open a connection to database \"example.db\".");
    }
}

public OnGameModeExit()
{
    // Close the connection to the database if connection is open
    if (DB_Close(gDBConnectionHandle))
    {
        // Extra cleanup
        gDBConnectionHandle = DB:0;
    }

    // ...

    return 1;
}