MyBatis+MySQL returns the method of inserted primary key ID
- 2020-07-21 07:34:01
- OfStack
Requirement: After you insert a record into the MySQL database using MyBatis, you need to return the autoincrement primary key value for that record.
Method: Specify the keyProperty attribute in mapper, as follows:
<insert id="insertAndGetId" useGeneratedKeys="true" keyProperty="userId" parameterType="com.chenzhou.mybatis.User">
insert into user(userName,password,comment)
values(#{userName},#{password},#{comment})
</insert>
As shown above, we specify keyProperty= "userId" in insert, where userId represents the primary key attribute of the inserted User object.
User.java
public class User {
private int userId;
private String userName;
private String password;
private String comment;
//setter and getter
}
UserDao.java
public interface UserDao {
public int insertAndGetId(User user);
}
Testing:
User user = new User();
user.setUserName("chenzhou");
user.setPassword("xxxx");
user.setComment(" Test the insert data return primary key function ");
System.out.println(" The primary key before insertion is: "+user.getUserId());
userDao.insertAndGetId(user);// The insert
System.out.println(" After insertion, the primary key is: "+user.getUserId());
Output:
The primary key before insertion is: 0
After insertion, the primary key is: 15