版本锁定

xml

<properties>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
 </properties>

DAO层存放接口

java

public interface IUserDo {

    void saveUser(User user);
}

main层存放对象

java

public class User implements Serializable {
    private String sex;
    private  String username;
    private String address;
    private Date birthday;

    public String  getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public Date getBirthday() {
        return birthday;
    }

    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }

    @Override
    public String toString() {
        return "User{" +
                "sex=" + sex +
                ", username='" + username + '\'' +
                ", address='" + address + '\'' +
                ", birthday=" + birthday +
                '}';
    }
}

test层调用

java

public class test {
    private IUserDo userDo;
    private InputStream in;
    private SqlSession sqlSession;


    @Before//用于在测试方法执行之前执行
    public void init()throws Exception{
        //1.读取配置文件，生成字节输入流
        in = Resources.getResourceAsStream("SqlMapConfig.xml");
        //2.获取SqlSessionFactory
        SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(in);
        //3.获取SqlSession对象
        sqlSession = factory.openSession();
        //4.获取dao的代理对象
       userDo= sqlSession.getMapper(IUserDo.class);
    }

    @After//用于在测试方法执行之后执行
    public void destroy()throws Exception{
        //提交事务
        sqlSession.commit();
        //6.释放资源
        sqlSession.close();
        in.close();
    }


    @Test
    public void testSave(){
        User user=new User();
        user.setAddress("北京市");
        user.setSex("男");
        user.setBirthday(new Date());
        user.setUsername("wo");
        System.out.println("保存操作之前："+user);
        userDo.saveUser(user);
        System.out.println("保存操作之后："+user);

    }

    }

映射文件

xml

<mapper namespace="io.likai.dao.IUserDo">

    <insert id="saveUser" parameterType="io.likai.domain.User">

        insert into user(username,address,sex,birthday)values(#{username},#{address},#{sex},#{birthday});
    </insert>
</mapper>
namespace是dao层地址  
id是接口名字
paramertype是主方法的地址

sql文件

xml

<configuration> <!-- 配置mybatis的环境 -->
    <environments default="mysql"> <!-- 配置mysql的环境 -->
        <environment id="mysql"> <!-- 配置事务的类型 -->
            <transactionManager type="JDBC"></transactionManager> <!-- 配置连接数据库的信息：用的是数据源(连接池) -->
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.cj.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/test?serverTimezone=GMT"/>
                <property name="username" value="root"/>
                <property name="password" value="likai"/>
            </dataSource>
        </environment>
    </environments> <!-- 告知mybatis映射配置的位置 -->
    <mappers>
        <mapper resource="io/likai/dao/User.xml"/>
    </mappers>
</configuration>

常用注解

@Insert:实现新增
@Update:实现更新
@Delete:实现删除
@Select:实现查询
@Result:实现结果集封装
@Results:可以与
@Result一起使用，封装多个结果集
@ResultMap:实现引用
@Results定义的封装
@One:实现一对一结果集封装
@Many:实现一对多结果集封装
@SelectProvider: 实现动态SQL映射
@CacheNamespace:实现注解二级缓存的使用

注解的SqlMapConfig配置

xml

<mappers>
        <package name="io.likai.dao"/>
 </mappers>
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