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MyBatis分页查询

2020-09-21 03:01:05  阅读:179  来源: 互联网

标签:java 分页 查询 DEBUG mysql MyBatis main com size


limit

mapper接口

// 分页查询
List<User> pageUserList(Map<String, Integer> map);

mapper

<select id="pageUserList" resultMap="userResult">
    select id, name, pwd from user limit #{offset}, #{size};
</select>

测试代码

try(final SqlSession sqlSession = MyBatisUtil.getSqlSession()) {
    UserMapper userMapper = sqlSession.getMapper(UserMapper.class);
    Map<String, Integer> map = new HashMap<>();
    int page = 1;
    int size = 2;
    map.put("offset", (page - 1) * size);
    map.put("size", size);
    List<User> userList = userMapper.pageUserList(map);
    Iterator<User> userIterator = userList.iterator();
    while (userIterator.hasNext()) {
        System.out.println(userIterator.next());
    }
}

运行结果

Loading class `com.mysql.jdbc.Driver'. This is deprecated. The new driver class is `com.mysql.cj.jdbc.Driver'. The driver is automatically registered via the SPI and manual loading of the driver class is generally unnecessary.
DEBUG [main] (JdbcTransaction.java:137) - Opening JDBC Connection
DEBUG [main] (PooledDataSource.java:434) - Created connection 98394724.
DEBUG [main] (JdbcTransaction.java:101) - Setting autocommit to false on JDBC Connection [com.mysql.cj.jdbc.ConnectionImpl@5dd6264]
DEBUG [main] (BaseJdbcLogger.java:137) - ==>  Preparing: select id, name, pwd from user limit ?, ?;
DEBUG [main] (BaseJdbcLogger.java:137) - ==> Parameters: 0(Integer), 2(Integer)
DEBUG [main] (BaseJdbcLogger.java:137) - <==      Total: 2
User(id=1, username=张三, password=123456)
User(id=2, username=李四, password=123456)
DEBUG [main] (JdbcTransaction.java:123) - Resetting autocommit to true on JDBC Connection [com.mysql.cj.jdbc.ConnectionImpl@5dd6264]
DEBUG [main] (JdbcTransaction.java:91) - Closing JDBC Connection [com.mysql.cj.jdbc.ConnectionImpl@5dd6264]
DEBUG [main] (PooledDataSource.java:391) - Returned connection 98394724 to pool.
RowBounds

mapper接口

// 查询所有用户
List<User> selectUserList();

mapper

<select id="selectUserList" resultMap="userResult">
    select id, name, pwd from user;
</select>

测试代码

// 获取SqlSession对象
try(SqlSession sqlSession = MyBatisUtil.getSqlSession()) {
    int page = 1;
    int size = 2;
    List<User> userList = sqlSession.selectList("com.example.mapper.UserMapper.selectUserList", null,
            new RowBounds(((page - 1) * size), size));
    Iterator<User> userIterator = userList.iterator();
    while (userIterator.hasNext()) {
        System.out.println(userIterator.next());
    }
}

运行结果

DEBUG [main] (JdbcTransaction.java:137) - Opening JDBC Connection
Loading class `com.mysql.jdbc.Driver'. This is deprecated. The new driver class is `com.mysql.cj.jdbc.Driver'. The driver is automatically registered via the SPI and manual loading of the driver class is generally unnecessary.
DEBUG [main] (PooledDataSource.java:434) - Created connection 1307904972.
DEBUG [main] (JdbcTransaction.java:101) - Setting autocommit to false on JDBC Connection [com.mysql.cj.jdbc.ConnectionImpl@4df50bcc]
DEBUG [main] (BaseJdbcLogger.java:137) - ==>  Preparing: select id, name, pwd from user;
DEBUG [main] (BaseJdbcLogger.java:137) - ==> Parameters: 
User(id=1, username=张三, password=123456)
User(id=2, username=李四, password=123456)
DEBUG [main] (JdbcTransaction.java:123) - Resetting autocommit to true on JDBC Connection [com.mysql.cj.jdbc.ConnectionImpl@4df50bcc]
DEBUG [main] (JdbcTransaction.java:91) - Closing JDBC Connection [com.mysql.cj.jdbc.ConnectionImpl@4df50bcc]
DEBUG [main] (PooledDataSource.java:391) - Returned connection 1307904972 to pool.

标签:java,分页,查询,DEBUG,mysql,MyBatis,main,com,size
来源: https://www.cnblogs.com/qixioa/p/13703306.html

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