MFC Data Table Tutorial

To reference a class that calls a data table, you first need to create a database object within the MFC application and instantiate a record set object. Then you can access the data table in the database through the record set object.

Here is a simple example code demonstrating how to call a class for a data table in an MFC application.

// 声明数据库和记录集对象
CDatabase db;
CRecordset rs(&db);

// 连接数据库
if (db.OpenEx(_T("DSN=YourDSN;UID=YourUsername;PWD=YourPassword"))){
    // 执行数据库查询
    if (rs.Open(CRecordset::forwardOnly, _T("SELECT * FROM YourTable"))){
        // 遍历记录集
        while (!rs.IsEOF()){
            // 读取数据表字段值
            CString field1, field2;
            rs.GetFieldValue(_T("Field1"), field1);
            rs.GetFieldValue(_T("Field2"), field2);

            // 使用数据表字段值进行其他操作
            // ...

            // 移动到下一条记录
            rs.MoveNext();
        }

        // 关闭记录集
        rs.Close();
    }

    // 关闭数据库连接
    db.Close();
}

In the example above, a database object CDatabase and a record set object CRecordset are first instantiated, then the database is connected and data is queried from the table. The GetFieldValue method is used to retrieve field values from the table, which can then be manipulated as needed. Finally, make sure to close the connection and record set after using the database and record set.