SpringBoot整合Mybatis

1.用idea构建项目

2.使用Druid连接池

<!--druid连接池-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.0</version>
        </dependency>

3.pom.xml文件

<?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>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.3.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.yd</groupId>
    <artifactId>springboot-mybatis</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>springboot-mybatis</name>
    <description>Demo project for Spring Boot</description>

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

    <dependencies>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.0.0</version>
        </dependency>
     <!--druid连接池-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.0</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
            <!--在idea中使用Mybatis-generator插件快速生成代码-->
            <plugin>
                <!--Mybatis-generator插件,用于自动生成Mapper和POJO-->
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-maven-plugin</artifactId>
                <version>1.3.2</version>
                <configuration>
                    <!--配置文件的位置-->
                    <configurationFile>src/main/resources/mybatis-generator-config.xml</configurationFile>
                    <verbose>true</verbose>
                    <overwrite>true</overwrite>
                </configuration>
                <executions>
                    <execution>
                        <id>Generate MyBatis Artifacts</id>
                        <goals>
                            <goal>generate</goal>
                        </goals>
                    </execution>
                </executions>
                <dependencies>
                    <dependency>
                        <groupId>org.mybatis.generator</groupId>
                        <artifactId>mybatis-generator-core</artifactId>
                        <version>1.3.2</version>
                    </dependency>
                </dependencies>
            </plugin>
            <!--end-->
        </plugins>
    </build>

</project>

4.application.yml文件

server:
  port: 9099

#开发配置
spring:
  profiles: dev
  datasource:
    # 使用druid数据源
    type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://127.0.0.1:3306/test?serverTimezone=GMT%2B8
    username: root
    password: 123456
---
#默认使用配置
spring:
  profiles:
    active: dev
mybatis:
  mapUnderscoreToCamelCase: true
  typeAliasesPackage: com.ls.pojo
  mapperLocations: classpath:mappers/*.xml

logging:
  level:
    com.yd.mapper: debug

5.使用MyBatis Generator自动生成代码自动生成代码，这里就不说了，可以看MyBatis Generator自动生成代码
6.启动

package com.yd;

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

@SpringBootApplication
//这里是扫描dao接口的包用于识别mybatis
@MapperScan(basePackages="com.yd.mapper")
public class SpringbootMybatisApplication {

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

}

7.pojo

package com.yd.pojo;

import java.io.Serializable;

public class UserTab implements Serializable {
    private static final long serialVersionUID = -2143595433523717391L;
    private Integer id;

    private String name;

    private Integer age;

    private String sex;

    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 == null ? null : name.trim();
    }

    public Integer getAge() {
        return age;
    }

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

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex == null ? null : sex.trim();
    }
}

8.Mapper接口

package com.yd.mapper;

import com.yd.pojo.UserTab;

import java.util.List;

public interface UserTabMapper {
    List<UserTab> selectAll();
    int deleteByPrimaryKey(Integer id);

    int insert(UserTab record);

    int insertSelective(UserTab record);

    UserTab selectByPrimaryKey(Integer id);

    int updateByPrimaryKeySelective(UserTab record);

    int updateByPrimaryKey(UserTab record);
}

9.service接口

package com.yd.service;



import com.yd.pojo.UserTab;

import java.util.List;

public interface UserService {

    List<UserTab> findAll();

}

10.service实现类

package com.yd.service.impl;


import com.yd.mapper.UserTabMapper;
import com.yd.pojo.UserTab;
import com.yd.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class UserServiceImpl implements UserService {

    @Autowired
    private UserTabMapper userTabMapper;
    @Override
    public List<UserTab> findAll() {
        List<UserTab> users = userTabMapper.selectAll();
        return  users;

    }
}

11.Controller

package com.yd.controller;

import com.yd.pojo.UserTab;
import com.yd.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;


@RestController
@RequestMapping("/user")
public class UserController {

    @Autowired
    private UserService userService;

    @GetMapping("/find")
    public List<UserTab>  find(){
        List<UserTab> all = userService.findAll();
        return all;
    }


}

12.UserTabMapper.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.yd.mapper.UserTabMapper" >
  <resultMap id="BaseResultMap" type="com.yd.pojo.UserTab" >
    <id column="id" property="id" jdbcType="INTEGER" />
    <result column="name" property="name" jdbcType="CHAR" />
    <result column="age" property="age" jdbcType="INTEGER" />
    <result column="sex" property="sex" jdbcType="CHAR" />
  </resultMap>
  <sql id="Base_Column_List" >
    id, name, age, sex
  </sql>
  <select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.Integer" >
    select 
    <include refid="Base_Column_List" />
    from user_tab
    where id = #{id,jdbcType=INTEGER}
  </select>
  <delete id="deleteByPrimaryKey" parameterType="java.lang.Integer" >
    delete from user_tab
    where id = #{id,jdbcType=INTEGER}
  </delete>
  <insert id="insert" parameterType="com.yd.pojo.UserTab" >
    insert into user_tab (id, name, age, sex
      )
    values (#{id,jdbcType=INTEGER}, #{name,jdbcType=CHAR}, #{age,jdbcType=INTEGER}, #{sex,jdbcType=CHAR}
      )
  </insert>
  <insert id="insertSelective" parameterType="com.yd.pojo.UserTab" >
    insert into user_tab
    <trim prefix="(" suffix=")" suffixOverrides="," >
      <if test="id != null" >
        id,
      </if>
      <if test="name != null" >
        name,
      </if>
      <if test="age != null" >
        age,
      </if>
      <if test="sex != null" >
        sex,
      </if>
    </trim>
    <trim prefix="values (" suffix=")" suffixOverrides="," >
      <if test="id != null" >
        #{id,jdbcType=INTEGER},
      </if>
      <if test="name != null" >
        #{name,jdbcType=CHAR},
      </if>
      <if test="age != null" >
        #{age,jdbcType=INTEGER},
      </if>
      <if test="sex != null" >
        #{sex,jdbcType=CHAR},
      </if>
    </trim>
  </insert>
  <update id="updateByPrimaryKeySelective" parameterType="com.yd.pojo.UserTab" >
    update user_tab
    <set >
      <if test="name != null" >
        name = #{name,jdbcType=CHAR},
      </if>
      <if test="age != null" >
        age = #{age,jdbcType=INTEGER},
      </if>
      <if test="sex != null" >
        sex = #{sex,jdbcType=CHAR},
      </if>
    </set>
    where id = #{id,jdbcType=INTEGER}
  </update>
  <update id="updateByPrimaryKey" parameterType="com.yd.pojo.UserTab" >
    update user_tab
    set name = #{name,jdbcType=CHAR},
      age = #{age,jdbcType=INTEGER},
      sex = #{sex,jdbcType=CHAR}
    where id = #{id,jdbcType=INTEGER}
  </update>
  <select id="selectAll" resultMap="BaseResultMap">
    select  * from  user_tab
  </select>
</mapper>

13.浏览器访问：http://localhost:9099/user/find