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springBoot 集成 Mybatis_org.mybatis.spring.boot

作者：很楠不爱3 | 2024-04-27 18:48:10

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org.mybatis.spring.boot

一、无 mybatis 配置文件方式

1.1 配置相关信息

1.1.1 添加 maven 依赖


<dependency>
	<groupId>org.mybatis.spring.boot</groupId>
	<artifactId>mybatis-spring-boot-starter</artifactId>
	<version>1.1.1</version>
</dependency>
<dependency>
	<groupId>mysql</groupId>
	<artifactId>mysql-connector-java</artifactId>
</dependency>

1.1.2 修改 application.properties


spring.datasource.url=jdbc:mysql://localhost:3306/zlits_user?useSSL=false
spring.datasource.username=root
spring.datasource.password=Rfid123456
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
 
spring.jpa.properties.hibernate.hbm2ddl.auto=update
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL5InnoDBDialect
spring.jpa.show-sql= true

1.1.3 建库建表


DROP DATABASE IF EXISTS zlits_user;
CREATE DATABASE zlits_user;
USE zlits_user;
SET FOREIGN_KEY_CHECKS=0;
DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT 'ID',
  `name` varchar(30) CHARACTER SET utf8 COLLATE utf8_bin DEFAULT NULL COMMENT '名字',
  `password` varchar(30) CHARACTER SET utf8 COLLATE utf8_bin DEFAULT NULL COMMENT '密码',
  `age` bigint(20)  DEFAULT NULL  COMMENT '年龄',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='人员信息表';

1.1.4 项目代码结构

在写用例的工程中发现，这个 main 类需要在根目录下启动才能管理起整个工程来

1.2 编码

1.2.1 mapper 层


@Mapper
public interface UserMapper {
	
	@Select("select id,name,password,age from user")
	List<User> findAll();
 
    @Delete("delete from user where id=#{id}")
	int deleteUserById(int id);
	
	@Update({"update user set name=#{name},password=#{password},age=#{age} where id=#{id}"})
	int updateUserById(User user);
	
	@Insert({"insert into user(name,password,age) values(#{name},#{password},#{age})"})
	int insertUser(User user);
	
	@Select({"select * from user where id=#{id}"})
	User selectUserById(int id);
}

1.2.2 service 层


public interface UserService {
 
	public List<User> findAll();
    int deleteUserById(int id);
	int updateUserById(User user);
	int insertUser(User user);
	User selectUserById(int id);
}


@Service
public class UserServiceImpl implements UserService {
 
	@Autowired
	UserMapper mapper;
	
	@Override
	public List<User> findAll() {		
	    return mapper.findAll();
	}
    @Override
	public int deleteUserById(int id) {
		return mapper.deleteUserById(id);
	}
	@Override
	public int updateUserById(User user) {
		return mapper.updateUserById(user);
	}
	@Override
	public int insertUser(User user) {
		return mapper.insertUser(user);
	}
	@Override
	public User selectUserById(int id) {
		return mapper.selectUserById(id);
	}
}

1.2.3 entity 层


public class User {
 
	private int id;
	private String name;
	private String password;
	private int age;
 
	// setter、getter、toString()
}

1.2.4 controller层


@Controller
public class UserController {
 
	@Autowired
	UserService userService;
	
	@RequestMapping("/listUser")
	public String listUser(Model model) {
		List<User> users = userService.findAll();
		model.addAttribute("users", users);
                System.out.println(addUser());
		System.out.println(modifyUser());
		System.out.println(deleUser());
		return "listUser";
	}
    //新增
	public int addUser() {
		User user = new User();
		user.setName("张三丰");
		user.setAge(80);
		user.setPassword("dsdsds");
		return userService.insertUser(user);
	}
	//修改
	public int modifyUser() {
		User user = userService.selectUserById(1);
		user.setName(user.getName()+"A");
		user.setAge(user.getAge()+1);
		user.setPassword(user.getPassword()+"A");
		return userService.updateUserById(user);
	}
	//删除
	public int deleUser() {
		return userService.deleteUserById(2);
	}
}

1.2.5 jsp 页面


<%@ page language="java" contentType="text/html; charset=UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
	<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
 
	<table align='center' border='1' cellspacing='0'>
	    <tr>
	        <td>id</td>
	        <td>name</td>
	        <td>password</td>
	        <td>age</td>
	    </tr>
	    <c:forEach items="${users}" var="s" varStatus="st">
	        <tr>
	            <td>${s.id}</td>
	            <td>${s.name}</td>
	            <td>${s.password}</td>
              	<td>${s.age}</td>
	        </tr>
	    </c:forEach>
	</table>
</body>
</html>

1.2.6 测试

在浏览器输入 http://localhost:8080/listUser

二、有 mybatis 配置文件方式

2.1 配置相关信息

2.1.1添加 maven 依赖


<dependency>
	<groupId>org.mybatis.spring.boot</groupId>
	<artifactId>mybatis-spring-boot-starter</artifactId>
	<version>1.1.1</version>
</dependency>
<dependency>
	<groupId>mysql</groupId>
	<artifactId>mysql-connector-java</artifactId>
</dependency>

2.1.2 修改 application.properties


spring.mvc.view.prefix=/WEB-INF/views/
spring.mvc.view.suffix=.jsp
 
spring.datasource.url=jdbc:mysql://localhost:3306/zlits_user?useSSL=false
spring.datasource.username=root
spring.datasource.password=Rfid123456
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
 
spring.jpa.properties.hibernate.hbm2ddl.auto=update
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL5InnoDBDialect
spring.jpa.show-sql= true
 
# 是否检查配置文件
mybatis.check-config-location =true
#mybatis的配置文件的位置
mybatis.config-location=classpath:mybatis-config.xml
#mybatis的mapper文件的位置
mybatis.mapper-locations=classpath*:mapper/*Mapper.xml

2.1.3 建库建表


DROP DATABASE IF EXISTS zlits_user;
CREATE DATABASE zlits_user;
USE zlits_user;
SET FOREIGN_KEY_CHECKS=0;
DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
  `ID` bigint(20) NOT NULL AUTO_INCREMENT COMMENT 'ID',
  `NAME` varchar(30) CHARACTER SET utf8 COLLATE utf8_bin DEFAULT NULL COMMENT '名字',
  `PASSWORD` varchar(30) CHARACTER SET utf8 COLLATE utf8_bin DEFAULT NULL COMMENT '密码',
  `AGE` bigint(20)  DEFAULT NULL  COMMENT '年龄',
  PRIMARY KEY (`ID`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='人员信息表';

2.1.4 项目代码结构

2.2 编码

2.2.1 mapper 层


@Mapper
public interface UserMapper {
	
    int deleteByPrimaryKey(Long id);
    int insert(User record);
    int insertSelective(User record);
    User selectByPrimaryKey(Long id);
    int updateByPrimaryKeySelective(User record);
    int updateByPrimaryKey(User record);
    List<User> selectAll();
}

2.2.2 entity 层


public class User implements Serializable {
 
    private Long id;
    private String name;
    private String password;
    private Long age;
    private static final long serialVersionUID = 1L;
 
    // setter、getter、toString
}

2.2.3 UserMapper.xml


<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.generator.dao.UserMapper">
  <resultMap id="BaseResultMap" type="com.generator.entity.User">
    <id column="ID" jdbcType="BIGINT" property="id" />
    <result column="NAME" jdbcType="VARCHAR" property="name" />
    <result column="PASSWORD" jdbcType="VARCHAR" property="password" />
    <result column="AGE" jdbcType="BIGINT" property="age" />
  </resultMap>
  <sql id="Base_Column_List">
    ID, NAME, PASSWORD, AGE
  </sql>
  <select id="selectByPrimaryKey" parameterType="java.lang.Long" resultMap="BaseResultMap">
    select 
    <include refid="Base_Column_List" />
    from user
    where ID = #{id,jdbcType=BIGINT}
  </select>
  <select id="selectAll" resultMap="BaseResultMap">
    select 
    <include refid="Base_Column_List" />
    from user
  </select>
  <delete id="deleteByPrimaryKey" parameterType="java.lang.Long">
    delete from user
    where ID = #{id,jdbcType=BIGINT}
  </delete>
  <insert id="insert" parameterType="com.generator.entity.User">
    <selectKey keyProperty="id" order="AFTER" resultType="java.lang.Long">
      SELECT LAST_INSERT_ID()
    </selectKey>
    insert into user (NAME, PASSWORD, AGE
      )
    values (#{name,jdbcType=VARCHAR}, #{password,jdbcType=VARCHAR}, #{age,jdbcType=BIGINT}
      )
  </insert>
  <insert id="insertSelective" parameterType="com.generator.entity.User">
    <selectKey keyProperty="id" order="AFTER" resultType="java.lang.Long">
      SELECT LAST_INSERT_ID()
    </selectKey>
    insert into user
    <trim prefix="(" suffix=")" suffixOverrides=",">
      <if test="name != null">
        NAME,
      </if>
      <if test="password != null">
        PASSWORD,
      </if>
      <if test="age != null">
        AGE,
      </if>
    </trim>
    <trim prefix="values (" suffix=")" suffixOverrides=",">
      <if test="name != null">
        #{name,jdbcType=VARCHAR},
      </if>
      <if test="password != null">
        #{password,jdbcType=VARCHAR},
      </if>
      <if test="age != null">
        #{age,jdbcType=BIGINT},
      </if>
    </trim>
  </insert>
  <update id="updateByPrimaryKeySelective" parameterType="com.generator.entity.User">
    update user
    <set>
      <if test="name != null">
        NAME = #{name,jdbcType=VARCHAR},
      </if>
      <if test="password != null">
        PASSWORD = #{password,jdbcType=VARCHAR},
      </if>
      <if test="age != null">
        AGE = #{age,jdbcType=BIGINT},
      </if>
    </set>
    where ID = #{id,jdbcType=BIGINT}
  </update>
  <update id="updateByPrimaryKey" parameterType="com.generator.entity.User">
    update user
    set NAME = #{name,jdbcType=VARCHAR},
      PASSWORD = #{password,jdbcType=VARCHAR},
      AGE = #{age,jdbcType=BIGINT}
    where ID = #{id,jdbcType=BIGINT}
  </update>
</mapper>

2.2.4 service 层


public interface UserService {
	public List<User> findAll();
}


@Service
public class UserServiceImpl implements UserService {
 
	@Autowired
	UserMapper mapper;
	
	public List<User> findAll() {
		System.out.println("执行了DAO层");
		return mapper.selectAll();
	}
}

2.2.5 Controller 层


@Controller
public class UserController {
 
	@Autowired
	UserService userService;
	// 查询
	@RequestMapping("/listUserCommon")
	public String listUser(Model model) {
		List<User> users = userService.findAll();
		for (User user : users) {
			System.out.println(user.toString());
		}
		model.addAttribute("users", users);
		
		return "listUser";
	}
}

2.2.6 jsp 页面


<%@ page language="java" contentType="text/html; charset=UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
	<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
 
	<table align='center' border='1' cellspacing='0'>
	    <tr>
	        <td>id</td>
	        <td>name</td>
	        <td>password</td>
	        <td>age</td>
	    </tr>
	    <c:forEach items="${users}" var="s" varStatus="st">
	        <tr>
	            <td>${s.id}</td>
	            <td>${s.name}</td>
	            <td>${s.password}</td>
              	<td>${s.age}</td>
	        </tr>
	    </c:forEach>
	</table>
</body>
</html>

2.2.7 测试

在浏览器输入 http://localhost:8080/listUserCommon

2.2.8 说明

如果 UserMapper 类上不添加 @Mapper 注解，那么就得在启动类上添加 @MapperScan 注解，一般情况下都是在启动类上添加 @MapperScan 注解，这样比较简单。

加这个注解的标签主要是为了让 Spring 进行管理，如果有多个 dao，用逗号隔开即可，如下

@MapperScan({"com.zit.cac.dao","com.zit.epms.dao"})

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