MyBatis 原生使用

布满荆棘的人生 2022-10-24 01:45 80阅读 0赞

结合官方文档，试了一下 MyBatis 原生使用。源码已上传到 github

[https://github.com/ConstXiong/toy/tree/master/demo/mybatis][https_github.com_ConstXiong_toy_tree_master_demo_mybatis]

**1、maven 依赖，MySQL驱动 + MyBatis 3.5.5**

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
    
        <parent>
            <groupId>constxiong</groupId>
            <artifactId>demo</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </parent>
        <artifactId>mybatis</artifactId>
    
        <dependencies>
            
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>8.0.21</version>
            </dependency>
    
            
            <dependency>
    		  <groupId>org.mybatis</groupId>
    		  <artifactId>mybatis</artifactId>
    		  <version>3.5.5</version>
    		</dependency>
    
        </dependencies>
    
        <build>
    
        </build>
    </project>

**2、MyBatis 配置文件 mybatis-config.xml**

<?xml version="1.0" encoding="UTF-8" ?>
    <!DOCTYPE configuration
            PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
            "http://mybatis.org/dtd/mybatis-3-config.dtd">
    <configuration>
        <environments default="development">
            <environment id="development">
                <transactionManager type="JDBC"/>
                <dataSource type="POOLED">
                    <property name="driver" value="com.mysql.jdbc.Driver"/>
                    <property name="url" value="jdbc:mysql://172.31.32.184:3306/constxiong?serverTimezone=UTC&useSSL=false&useUnicode=true&characterEncoding=UTF-8"/>
                    <property name="username" value="root"/>
                    <property name="password" value="constxiong@123"/>
                </dataSource>
            </environment>
        </environments>
        <mappers>
            <mapper resource="constxiong/mapper/UserMapper.xml"/>
        </mappers>
    </configuration>

**3、写 SQL 的 mapper xml**

<?xml version="1.0" encoding="UTF-8" ?>
    <!DOCTYPE mapper
            PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
            "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
    <mapper namespace="constxiong.mapper.UserMapper">
    
        <select id="selectUser" resultType="constxiong.po.User" parameterType="constxiong.po.User">
            select * from user where id = #{id}
        </select>
    
        <insert id="insertUser" parameterType="constxiong.po.User">
            insert into user values(#{id}, #{name})
        </insert>
    
    </mapper>

**4、Mapper 接口类，结合使用了 @Select**

package constxiong.mapper;
    
    import constxiong.po.User;
    import org.apache.ibatis.annotations.Select;
    
    import java.util.List;
    
    /**
     * UserMapper 接口，映射对数据库的操作
     */
    public interface UserMapper {
    
        public User selectUser(int id);
    
        public int insertUser(User user);
    
        @Select("select * from user")
        public List<User>  selectAllUsers();
    }

**5、User PO 模型**

package constxiong.po;
    
    /**
     * 用户表模型
     */
    public class User {
        private Integer id;
    
        private String name;
    
        public User(Integer id, String name) {
            this.id = id;
            this.name = name;
        }
    
        public Integer getId() {
            return id;
        }
    
        public void setId(Integer id) {
            this.id = id;
        }
    
        public String getName() {
            return name;
        }
    
        public void setName(String name) {
            this.name = name;
        }
    
        @Override
        public String toString() {
            return "User{" +
                    "id=" + id +
                    ", name='" + name + '\'' +
                    '}';
        }
    }

**6、测试 MyBatis xml 与 注解的使用**

package constxiong;
    
    import constxiong.mapper.UserMapper;
    import constxiong.po.User;
    import org.apache.ibatis.datasource.pooled.PooledDataSource;
    import org.apache.ibatis.io.Resources;
    import org.apache.ibatis.mapping.Environment;
    import org.apache.ibatis.session.Configuration;
    import org.apache.ibatis.session.SqlSession;
    import org.apache.ibatis.session.SqlSessionFactory;
    import org.apache.ibatis.session.SqlSessionFactoryBuilder;
    import org.apache.ibatis.transaction.TransactionFactory;
    import org.apache.ibatis.transaction.jdbc.JdbcTransactionFactory;
    
    import javax.sql.DataSource;
    import java.io.IOException;
    import java.io.InputStream;
    import java.util.List;
    
    /**
     * 测试 Mybatis xml 与 注解的使用
     */
    public class Test {
    
        public static void main(String[] args) throws IOException {
            testXmlConfig();
            testJavaConfig();
        }
    
        /**
         * 测试 xml 配置方式
         */
        private static void testXmlConfig() throws IOException {
            String resource = "mybatis-config.xml";//xml配置文件路径
            InputStream inputStream = Resources.getResourceAsStream(resource);//读取配置
            SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);//构建 SqlSessionFactory
            SqlSession sqlSession = sqlSessionFactory.openSession(true);//通过 SqlSessionfactory 获取 SqlSession
    
            UserMapper userMapper = sqlSession.getMapper(UserMapper.class);//通过 SqlSession 获取 Mapper 接口
    
            //插入 user
            userMapper.insertUser(new User(1, "ConstXiong1"));
            //查询该 user
            User user = userMapper.selectUser(1);
            System.out.println(user);
            //查询所有 user 数据
            List<User> users = userMapper.selectAllUsers();
            System.out.println(users);
    
            //关闭 SqlSession
            sqlSession.close();
        }
    
        /**
         * 测试 Java 方式
         */
        private static void testJavaConfig() {
            // 创建数据源
            DataSource dataSource = new PooledDataSource("com.mysql.jdbc.Driver",
                    "jdbc:mysql://172.31.32.184:3306/constxiong?serverTimezone=UTC&useSSL=false&useUnicode=true&characterEncoding=UTF-8",
                    "root",
                    "constxiong@123");
            //事务
            TransactionFactory transactionFactory = new JdbcTransactionFactory();
            //环境
            Environment environment = new Environment("development", transactionFactory, dataSource);
            //配置
            Configuration configuration = new Configuration(environment);
            //注册
            configuration.addMapper(UserMapper.class);
            SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(configuration);
            SqlSession sqlSession = sqlSessionFactory.openSession(true);
    
            UserMapper userMapper = sqlSession.getMapper(UserMapper.class);
    
            //插入 user
            userMapper.insertUser(new User(2, "ConstXiong2"));
            //查询该 user
            User user = userMapper.selectUser(2);
            System.out.println(user);
            //查询所有 user 数据
            List<User> users = userMapper.selectAllUsers();
            System.out.println(users);
    
            //关闭 SqlSession
            sqlSession.close();
        }
    }

**7、运行结果**

User{id=1, name='ConstXiong1'}
    [User{id=1, name='ConstXiong1'}]
    User{id=2, name='ConstXiong2'}
    [User{id=1, name='ConstXiong1'}, User{id=2, name='ConstXiong2'}]

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[https_github.com_ConstXiong_toy_tree_master_demo_mybatis]: https://github.com/ConstXiong/toy/tree/master/demo/mybatis
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