SpringBoot整合Mybatis注解和xml配置形式分别使用（增、删、改、查）

不介绍理论之类的了。直接上代码演示

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

    <modelVersion>4.0.0</modelVersion>
	
	<name>07-spring-boot-mybatis</name>
    <description>Demo project for Spring Boot</description>

    <groupId>com.kevin</groupId>
    <artifactId>07-spring-boot-mybatis</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <!-- springboot版本-->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.3.RELEASE</version>
    </parent>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <!-- springboot启动器-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!-- web启动器-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <!-- mybatis启动器-->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.0.0</version>
        </dependency>
        <!-- mysql数据库驱动-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.45</version>
        </dependency>
        <!-- druid数据库连接池-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.12</version>
        </dependency>
        <!-- mybatis逆向生成工程-->
        <dependency>
            <groupId>org.mybatis.generator</groupId>
            <artifactId>mybatis-generator-core</artifactId>
            <version>1.3.7</version>
        </dependency>
        <!-- json解析器 -->
        <dependency>
            <groupId>com.google.code.gson</groupId>
            <artifactId>gson</artifactId>
            <version>2.8.5</version>
        </dependency>
    </dependencies>
    
</project>

application.yml

spring:
  #数据源配置
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/ssm_crud?characterEncoding=utf-8
    username: root
    password: 123456
    type: com.alibaba.druid.pool.DruidDataSource
  #springboot的静态资源调用
  thymeleaf:
    prefix: classpath:/templates/
    cache: false
mybatis:
  #定义别名
  type-aliases-package: com.kevin.entity
  #指定sql映射文件位置
  mapper-locations: classpath:mybatis/mapper/*.xml
#打印执行的sql语句
logging:
  level:
    com:
      kevin:
        mapper: debug

mbg.xml，用不用无所谓，看个人喜欢，我现在并没用上，mybatis的逆向生成

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
		PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
		"http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">

<generatorConfiguration>
	<!-- 数据库驱动:选择你的本地硬盘上面的数据库驱动包-->
	<!--<classPathEntry location="D:\generator\mysql-connector-java-5.0.7-bin.jar" />-->
	<context id="DB2Tables" targetRuntime="MyBatis3">
		<commentGenerator>
			<property name="suppressAllComments" value="true" />
		</commentGenerator>
		<!--数据库链接URL，用户名、密码 -->
		<!-- connectionURL="jdbc:sqlserver://localhost:1433;databasename=xxx" -->
        <jdbcConnection
                driverClass="com.mysql.jdbc.Driver"
				connectionURL="jdbc:mysql://localhost:3306/ssm_crud"
                userId="root"
                password="123456">
        </jdbcConnection>
		<!-- 默认false，把JDBC DECIMAL 和NUMERIC 类型解析为Integer，为true时把JDBC DECIMAL和
		NUMERIC 类型解析为java.math.BigDecimal -->
		<javaTypeResolver>
			<property name="forceBigDecimals" value="false" />
		</javaTypeResolver>
		<!-- 生成模型的包名和位置-->
		<!-- targetPackage="com.atmb.cloud.entity" -->
		<javaModelGenerator
				targetPackage="entity"
				targetProject="src/main/java">
			<!-- 是否让schema作为包的后缀 -->
			<property name="enableSubPackages" value="true" />
			<!-- 从数据库返回值被清理前后的空格 -->
			<property name="trimStrings" value="true" />
		</javaModelGenerator>
		<!-- 生成映射文件的包名和位置-->
		<sqlMapGenerator targetPackage="mybatis.mapper"
						 targetProject="src/main/resources">
			<property name="enableSubPackages" value="true" />
		</sqlMapGenerator>

		<!-- 生成DAO的包名和位置-->
		<javaClientGenerator
				type="XMLMAPPER"
				targetPackage="com.kevin.mapper"
				targetProject="src/main/java">
			<property name="enableSubPackages" value="true" />
		</javaClientGenerator>

		<!-- 要生成的表 tableName是数据库中的表名或视图名 domainObjectName是实体类名-->
		<table tableName="GeneralAviation" domainObjectName="GeneralAviation"
			   enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false"
			   enableSelectByExample="false" selectByExampleQueryId="false" />
		<!--<table tableName="Airway" domainObjectName="Airway"></table>-->
	</context>
</generatorConfiguration>

UsersMapper.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.kevin.mapper.UsersMapper">
	<!-- 添加用户 -->
	<insert id="insertUser" parameterType="users">
		insert into users(name,age) values(#{name},#{age})
	</insert>
	<!-- 查询全部用户 -->
	<select id="selectUsersAll" resultType="users">
		select id,name,age from users
	</select>
	<!-- 根据ID查询用户 -->
	<select id="selectUsersById" resultType="users">
		select id,name,age from users where id = #{value}
	</select>
	<!-- 更新用户 -->
	<update id="updateUser" parameterType="users">
		update users set name=#{name} ,age=#{age} where id=#{id}
	</update>
	<!-- 删除用户 -->
	<delete id="deleteUserById">
		delete from users where id = #{value}
	</delete>
</mapper>

MBGTest，逆向生成类

package com.kevin.utils;

import java.io.File;
import java.util.ArrayList;
import java.util.List;

import org.mybatis.generator.api.MyBatisGenerator;
import org.mybatis.generator.config.Configuration;
import org.mybatis.generator.config.xml.ConfigurationParser;
import org.mybatis.generator.internal.DefaultShellCallback;

/**
 * 执行逆向工程，生成javabean，mapper
 * @author caonanqing
 *
 */
public class MBGTest {
	
	public static void main(String[] args) throws Exception {
		
		List<String> warnings = new ArrayList<String>();
		boolean overwrite = true;
		String file = "mybatis/mbg.xml";
		File configFile = new File(file);
		ConfigurationParser cp = new ConfigurationParser(warnings);
		Configuration config = cp.parseConfiguration(configFile);
		DefaultShellCallback callback = new DefaultShellCallback(overwrite);
		MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config,callback, warnings);
		myBatisGenerator.generate(null);
		
	}

}

控制层

EmpsController

package com.kevin.controller;

import com.google.gson.Gson;
import com.kevin.entity.Emps;
import com.kevin.service.EmpsService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

/**
 * @author kevin
 * @version 1.0
 * @description     用注解方式获取数据
 * @createDate 2019/3/20
 */
@RestController
@RequestMapping("/emps")
public class EmpsController {

    @Autowired
    private EmpsService empsService;

    @RequestMapping("/select")
    public String selectEmps(){

        List<Emps> emps = empsService.selectEmps();

        // 将list的对象解析成json展示到页面
        Gson gson = new Gson();
        String json = gson.toJson(emps);
        return json;
    }
}

UsersController

package com.kevin.controller;

import com.kevin.entity.Users;
import com.kevin.service.UsersService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;

import java.util.List;

/**
 * @author kevin
 * @version 1.0
 * @description     用xml配置文件获取数据，视图控制层
 * @createDate 2019/3/13
 */
@Controller
@RequestMapping("/users")
public class UsersController {

    @Autowired
    private UsersService usersService;

    /**
     * 页面跳转     访问地址：http://localhost:8080/users/input
     * @param page
     * @return
     */
    @RequestMapping("/{page}")
    public String showPage(@PathVariable String page) {
        return page;
    }

    /**
     *  用户添加    访问地址：http://localhost:8080/users/input，添加name，age提交到该方法
     * @param users
     */
    @RequestMapping("/addUser")
    public String addUser(Users users) {
        this.usersService.addUser(users);
        return "ok";
    }

    /**
     * 查询全部用户    访问地址： http://localhost:8080/users/findUserAll
     */
    @RequestMapping("/findUserAll")
    public String findUserAll(Model model){
        List<Users> list = this.usersService.findUserAll();
        model.addAttribute("list", list);
        return "showUsers";
    }

    /**
     * 根据用户id查询用户   访问地址： http://localhost:8080/users/findUserAll ，点更新用户会来到该方法根据id查询出来
     */
    @RequestMapping("/findUserById")
    public String findUserById(Integer id,Model model){
        Users user = this.usersService.findUserById(id);
        model.addAttribute("user", user);
        return "updateUser";
    }

    /**
     * 更新用户   访问地址： http://localhost:8080/users/findUserAll ，点更新用户后修改点确定就会来到该方法修改
     */
    @RequestMapping("/editUser")
    public String editUser(Users users){
        this.usersService.updateUser(users);
        return "ok";
    }

    /**
     * 删除用户   访问地址： http://localhost:8080/users/findUserAll ，点删除用户会来到该方法进行删除
     */
    @RequestMapping("/delUser")
    public String delUser(Integer id){
        this.usersService.deleteUserById(id);
        return "redirect:/users/findUserAll";
    }

}

实体类层

Emps

package com.kevin.entity;

/**
 * @author kevin
 * @version 1.0
 * @description     邮箱实体类
 * @createDate 2019/3/20
 */
public class Emps {

    private Integer id;
    private String name;
    private String email;

    public Emps() {
    }

    public Emps(Integer id, String name, String email) {
        this.id = id;
        this.name = name;
        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 String getEmail() {
        return email;
    }

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

Users

package com.kevin.entity;

/**
 * @author kevin
 * @version 1.0
 * @description     用户实体类
 * @createDate 2019/3/13
 */
public class Users {

    private Integer id;
    private String name;
    private Integer age;

    public Users() {
    }

    public Users(Integer id, String name, Integer age) {
        this.id = id;
        this.name = name;
        this.age = age;
    }

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

    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 Integer getAge() {
        return age;
    }

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

Mapper层

EmpsMapper

package com.kevin.mapper;

import com.kevin.entity.Emps;
import org.apache.ibatis.annotations.Select;

import java.util.List;

/**
 * @author kevin
 * @version 1.0
 * @description     使用注解形式获取数据的数据
 * @createDate 2019/3/20
 */
public interface EmpsMapper {

    @Select("select * from emps")
    List<Emps> selectEmps();
}

UsersMapper

package com.kevin.mapper;

import com.kevin.entity.Users;

import java.util.List;

/**
 * @author kevin
 * @version 1.0
 * @description     使用xml形式获取数据，数据持久层
 * @createDate 2019/3/13
 */
public interface UsersMapper {

    void insertUser(Users users);

    List<Users> selectUsersAll();

    Users selectUsersById(Integer id);

    void updateUser(Users users);

    void deleteUserById(Integer id);
}

Service接口层

EmpsService

package com.kevin.service;

import com.kevin.entity.Emps;

import java.util.List;

/**
 * @author kevin
 * @version 1.0
 * @description
 * @createDate 2019/3/20
 */
public interface EmpsService {

    List<Emps> selectEmps();
}

UsersService

package com.kevin.service;

import com.kevin.entity.Users;

import java.util.List;

/**
 * @author kevin
 * @version 1.0
 * @description     业务层
 * @createDate 2019/3/13
 */
public interface UsersService {

    void addUser(Users users);

    List<Users> findUserAll();

    Users findUserById(Integer id);

    void updateUser(Users users);

    void deleteUserById(Integer id);
}

Service实现层

EmpsServiceImpl

package com.kevin.service.impl;

import com.kevin.entity.Emps;
import com.kevin.mapper.EmpsMapper;
import com.kevin.service.EmpsService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

/**
 * @author kevin
 * @version 1.0
 * @description
 * @createDate 2019/3/20
 */
@Service
public class EmpsServiceImpl implements EmpsService {

    @Autowired
    private EmpsMapper empsMapper;

    @Override
    public List<Emps> selectEmps() {
        return empsMapper.selectEmps();
    }
}

UsersServiceImpl

package com.kevin.service.impl;

import com.kevin.entity.Users;
import com.kevin.mapper.UsersMapper;
import com.kevin.service.UsersService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

/**
 * @author kevin
 * @version 1.0
 * @description     实现业务层
 * @createDate 2019/3/13
 */
@Service            // 表示为业务实现层
@Transactional      // 该注解表示该类下所有的方法都受控制
public class UsersServiceImpl implements UsersService {

    @Autowired
    UsersMapper usersMapper;

    @Override
    public void addUser(Users users) {
        this.usersMapper.insertUser(users);
    }

    @Override
    public List<Users> findUserAll() {
        return this.usersMapper.selectUsersAll();
    }

    @Override
    public Users findUserById(Integer id) {
        return this.usersMapper.selectUsersById(id);
    }

    @Override
    public void updateUser(Users users) {
        this.usersMapper.updateUser(users);
    }

    @Override
    public void deleteUserById(Integer id) {
        this.usersMapper.deleteUserById(id);
    }

}

启动类

package com.kevin;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

/**
 * @author kevin
 * @version 1.0
 * @description     springboot整合mybatis（注解和xml配置形式分别使用）
 * @createDate 2019/3/13
 */
@SpringBootApplication
@MapperScan(basePackages = {"com.kevin.mapper"})       // 扫描Mybatis的mapper的接口
public class Application {

    public static void main(String[] args) {
        SpringApplication.run(Application.class,args);
    }
}

页面

input.html

<!DOCTYPE html>
<html xmlns:th="http://www.w3.org/1999/xhtml">
<head>
    <meta charset="UTF-8">
    <title>添加用户</title>
</head>
<body>

    <form th:action="@{/users/addUser}" method="post">
        用户姓名：<input type="text" name="name"/><br/>
        用户年龄：<input type="text" name="age"/><br/>
        <input type="submit" value="确定"/><br/>
    </form>
</body>
</html>

ok.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>操作提示页面</title>
</head>
<body>
    操作成功！！！
</body>
</html>

showUsers.html

<!DOCTYPE html>
<html  xmlns:th="http://www.w3.org/1999/xhtml">
<head>
<meta charset="UTF-8">
<title>展示用户数据</title>
</head>
<body>
	<table border="1" style="width:300px;">
		<tr>
			<th>用户ID</th>
			<th>用户姓名</th>
			<th>用户年龄</th>
			<th>操作</th>
		</tr>
		<tr th:each="user : ${list}">
			<td th:text="${user.id}"></td>
			<td th:text="${user.name}"></td>
			<td th:text="${user.age}"></td>
			<td>
				<a th:href="@{/users/findUserById(id=${user.id})}">更新用户</a>
				<a th:href="@{/users/delUser(id=${user.id})}">删除用户</a>
			</td>
		</tr>
	</table>
</body>
</html>

updateUser.html

<!DOCTYPE html>
<html xmlns:th="http://www.w3.org/1999/xhtml">
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
	<form th:action="@{/users/editUser}" method="post">
			<input type="hidden" name="id" th:field="${user.id}"/>
			用户姓名：<input type="text" name="name" th:field="${user.name}"/><br/>
			用户年龄：<input type="text" name="age" th:field="${user.age}"/><br/>
			<input type="submit" value="确定"/><br/>
	</form>
</body>
</html>