第三章：【springboot】框架介绍MyBatis

MyBatis

概述：MyBatis 是一款优秀的持久层(三层架构中的dao层)框架，用来简化jdbc的开发.

配置

导入依赖

<!--pom.xml-->
<!--        mybatis起步依赖-->
<dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>3.5.14</version>
</dependency><!--        mysql驱动包-->
<dependency>
<groupId>com.mysql</groupId>
<artifactId>mysql-connector-j</artifactId>
<scope>runtime</scope>
</dependency>

配置数据库连接的四要素

#配置数据库连接信息 四要素
#驱动类名称
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
#数据库连接的url
spring.datasource.url=jdbc:mysql://localhost:3306/mydb01
#数据库连接的用户名
spring.datasource.username=root
#数据库连接的密码
spring.datasource.password=123456

新建Mapper接口

package com.springboot.Mapper;import com.springboot.Pojo.MyUser;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;import java.util.List;@Mapper //在运行时，会自动生成该接口的实现类对象（代理对象），并且将该对象交给IOC容器管理
public interface UserMapper {//查询全部用户信息@Select("select * from user")public List<MyUser> listUser();
}

使用javaBean类来结束数据库表

package com.springboot.Pojo;public class MyUser {private int id;private String name;private String password;private String createTime;private String updateTime;private Short status;public MyUser() {}public MyUser(int id, String name, String password, String createTime, String updateTime, Short status) {this.id = id;this.name = name;this.password = password;this.createTime = createTime;this.updateTime = updateTime;this.status = status;}@Overridepublic String toString() {return "MyUser{" +"id=" + id +", name='" + name + '\'' +", password='" + password + '\'' +", createTime=" + createTime +", updateTime=" + updateTime +", status=" + status +'}';}public int getId() {return id;}public void setId(int id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}public String getCreateTime() {return createTime;}public void setCreateTime(String createTime) {this.createTime = createTime;}pub