mybatis自增主键的获取

实体类

package org.example.entity;

public class User {
    private Integer id;
    private String name;
    private int age;
    private String gender;
    private String email;

    public User(Integer id, String name, int age, String gender, String email) {
        this.id = id;
        this.name = name;
        this.age = age;
        this.gender = gender;
        this.email = email;
    }

    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;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", age=" + age +
                ", gender='" + gender + '\'' +
                ", email='" + email + '\'' +
                '}';
    }
}

mapper接口

public void addUser(User user);

mapper.xml

　　<!--
        useGeneratedKeys:表示当前添加功能使用自增的主键
        keyProperty：将添加的数据的自增主键为实体类类型的参数的属性赋值
    -->
    <insert id="addUser" useGeneratedKeys="true" keyProperty="id">
        insert into t_user values (null,#{name},#{age},#{gender},#{email});
    </insert>

测试代码

 @Test
    public void addUser(){
        SqlSession sqlSession = SqlSessionUtil.getSqlSession();
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        User user = new User(null,"xiaoming",35,"男","[email protected]");
        mapper.addUser(user);
        System.out.println(user);
        sqlSession.close();
    }