Study the difference between MyBatis and traditional writing methods

To understand the differences between MyBatis and traditional writing, specific code examples are needed

With the continuous development and improvement of the Java programming language, database operations have become an indispensable part of the development process. A missing part. In past development, we usually used the traditional JDBC method to operate the database, but this method is cumbersome and error-prone. In order to simplify database operations, MyBatis emerged. It is a Java-based persistence layer framework that can help us interact with the database faster and easier. Let's take a look at the differences in code implementation between MyBatis and traditional writing methods.

In the traditional writing method, we usually need to manually write the database connection code, write SQL statements, and process the result set, etc. When using MyBatis, these tedious operations are automatically completed by the framework. When writing MyBatis code, you only need to focus on writing SQL statements and mapping result sets.

The following is a sample code that uses traditional writing methods to perform database queries:

public List<User> getUsers() {
    Connection connection = null;
    Statement statement = null;
    ResultSet resultSet = null;
    List<User> userList = new ArrayList<>();
    
    try {
        // 获取数据库连接
        connection = DriverManager.getConnection(JDBC_URL, USERNAME, PASSWORD);
        
        // 创建Statement对象
        statement = connection.createStatement();
        
        // 执行SQL查询语句
        resultSet = statement.executeQuery("SELECT * FROM user");
        
        // 处理结果集
        while (resultSet.next()) {
            User user = new User();
            user.setId(resultSet.getInt("id"));
            user.setName(resultSet.getString("name"));
            user.setAge(resultSet.getInt("age"));
            userList.add(user);
        }
    } catch (SQLException e) {
        e.printStackTrace();
    } finally {
        // 关闭资源
        try {
            if (resultSet != null) resultSet.close();
            if (statement != null) statement.close();
            if (connection != null) connection.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
    
    return userList;
}

In the above sample code, we need to manually manage the creation and closing of database connections, execute SQL statements, process result sets, etc. operate. Such code is not only redundant but also error-prone.

When using MyBatis for database operations, the above tedious operations can be automated through some simple configurations. The following is a sample code for database query using MyBatis:

public List<User> getUsers() {
    List<User> userList;
    
    try (SqlSession sqlSession = MyBatisUtil.getSqlSession()) {
        UserMapper userMapper = sqlSession.getMapper(UserMapper.class);
        
        userList = userMapper.getUsers();
    }
    
    return userList;
}

In this code sample, we obtain a SqlSession object through the getSqlSession method of the MyBatisUtil class. Then we obtained an instance of the UserMapper interface through the getMapper method, which defines methods for database operations. In the getUser method, we directly call the method in the UserMapper interface to perform database query operations. MyBatis will automatically execute the corresponding SQL statement according to the definition of the interface method, and map the result set to a User object.

As can be seen from the above code examples, using MyBatis to operate the database is more concise and convenient than traditional writing methods. MyBatis implements interaction with the database through a series of configurations and annotations, which greatly reduces the amount of code we manually write for database operations and improves development efficiency.

Of course, the above example is just a simple comparison between MyBatis and traditional writing, and cannot fully demonstrate all the features and advantages of MyBatis. In actual development, MyBatis also provides a series of advanced functions, such as dynamic SQL, caching, transaction management, etc. Proficient in the use of MyBatis can greatly simplify our database operations and improve development efficiency.

In short, MyBatis has obvious advantages in code implementation compared to traditional writing methods, reducing redundant operations and improving development efficiency. Therefore, it is very important to understand the use and features of MyBatis. For developers, mastering MyBatis can perform database operations more efficiently and improve development efficiency.

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