spring集成Mybatis

内容说明

本文介绍了spring如何集成mybatis，使用的是mysql数据库，依赖工具为gradle

• 环境准备
• 集成流程
• 测试

本文demo地址：https://github.com/wheijxiaotbai/HXB_Knowledge.git

分支: hxb_demo_springMybatis

环境准备

• mysql环境的准备，表的创建

  在具有docker的linux环境下执行

  docker run -dit --name demo_mysql -p 3306:3306 -e MYSQL_ROOT_PASSWORD=123456 mysql
  

  这样，就能快速启动一个mysql容器，账户为root，密码为123456，当然你可以自己修改MYSQL_ROOT_PASSWORD=123456参数以修改密码

  执行下面sql语句创建User表

  create table user (
        `id` int,
    `name` VARCHAR(32),
    `age` int,
    PRIMARY KEY (`id`)
  ) 
  

[图片上传中...(1551744767252.png-d600-1551746819338-0)]

集成流程

代码目录结构

1551744767252.png

• 添加依赖

  • spring 的相关包
  • spring与mybatis集成的相关包
  • mysql驱动包
  • mybatis包
  • commons-dbcp
  • junit

  testCompile group: 'junit', name: 'junit', version: '4.12'
  // https://mvnrepository.com/artifact/org.springframework/spring-context
  compile group: 'org.springframework', name: 'spring-context', version: '5.1.5.RELEASE'
  // https://mvnrepository.com/artifact/org.springframework/spring-core
  compile group: 'org.springframework', name: 'spring-core', version: '5.1.5.RELEASE'
  // https://mvnrepository.com/artifact/org.springframework/spring-beans
  compile group: 'org.springframework', name: 'spring-beans', version: '5.1.5.RELEASE'
  // https://mvnrepository.com/artifact/org.mybatis/mybatis-spring
  compile group: 'org.mybatis', name: 'mybatis-spring', version: '2.0.0'
  // https://mvnrepository.com/artifact/mysql/mysql-connector-java
  compile group: 'mysql', name: 'mysql-connector-java', version: '8.0.15'
  // https://mvnrepository.com/artifact/org.springframework/spring-aop
  compile group: 'org.springframework', name: 'spring-aop', version: '5.1.5.RELEASE'
  // https://mvnrepository.com/artifact/org.springframework/spring-jdbc
  compile group: 'org.springframework', name: 'spring-jdbc', version: '5.1.5.RELEASE'
  // https://mvnrepository.com/artifact/commons-dbcp/commons-dbcp
  compile group: 'commons-dbcp', name: 'commons-dbcp', version: '1.4'
  // https://mvnrepository.com/artifact/org.mybatis/mybatis
  compile group: 'org.mybatis', name: 'mybatis', version: '3.5.0'
  

• 创建User

  该类和上文准备操作中在数据库创建的表模型保持一致

  package user.model;
  
  import org.springframework.context.annotation.Bean;
  
  public class User {
  
      private int id;
      private String name;
      private int age;
  
      public User() {}
  
      private User(Builder builder) {
          setId(builder.id);
          setName(builder.name);
          setAge(builder.age);
      }
  
      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 int getAge() {
          return age;
      }
  
      public void setAge(int age) {
          this.age = age;
      }
  
      public static final class Builder {
          private int id;
          private String name;
          private int age;
  
          public Builder() {
          }
  
          public Builder id(int val) {
              id = val;
              return this;
          }
  
          public Builder name(String val) {
              name = val;
              return this;
          }
  
          public Builder age(int val) {
              age = val;
              return this;
          }
  
          public User build() {
              return new User(this);
          }
      }
  }
  

• User.xml

  该类是创建User对应的sqlxml，和mybatis没有与spring集成时是一样的

  • 在这里namespace为User所对应的Mapper接口，将该xml和mapper进行对应

  
  
  
      
      
        select * from user where id = #{value}
     
  
      
      
          insert into user (id , name , age)
          values (#{id},#{name},#{age})
      
  
      
      
          delete from user where id = #{value}
      
  
      
      
          update user
          set name = #{name} , age = #{age}
          where id = #{id}
      
  
  

• UserMapper

  该类为何User相应xml对应的接口类

  • 接口中的方法名必须和xml中的id一致

  • 接口中的方法的传入/返回参数必须与xml中的保持一致

  package user.mapper;
  
  import user.model.User;
  
  public interface UserMapper {
  
      public User findUserById(int id);
  
      public void addUser(User user);
  
      public void updateUserById(User user);
  
      public void deleteUserByID(int id);
  
  }
  

• db.properties

  该文件出存放了连接数据库的相关信息

  jdbc.driver=com.mysql.jdbc.Driver
  jdbc.url=jdbc:mysql://192.168.31.150:3306/hxb_demo_mynatis_01
  jdbc.username=root
  jdbc.password=123456
  

• applicationContext.xml

  该类为spring的配置类，在这里对mybatis进行配置

测试

编写测试类

springMybatisTest

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import user.mapper.UserMapper;
import user.model.User;

public class springMybatisTest {

    @Test
    public void testMapper() throws Exception {

        ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");
        UserMapper mapper = ac.getBean(UserMapper.class);
        User user = mapper.findUserById(1);
        System.out.print(user.getName());
    }

}