【SpringBoot】第三步：SpringBoot + MyBatis + MySql整合

其他 2019-04-20 14:00:52 阅读次数: 0

【配置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.cn.demo</groupId>
	<artifactId>springboot-demo</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>springboot-demo</name>
	<description>Demo project for Spring Boot</description>

	<properties>
		<!-- jdk -->
		<java.version>1.8</java.version>
		<!-- 项目编码-->
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
	</properties>

	<dependencies>
		<!-- springboot -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter</artifactId>
		</dependency>
		<!-- mybatis -->
		<dependency>
			<groupId>org.mybatis.spring.boot</groupId>
			<artifactId>mybatis-spring-boot-starter</artifactId>
			<version>2.0.0</version>
		</dependency>
		<!-- 数据库 -->
		<dependency>
		  <groupId>mysql</groupId>
		  <artifactId>mysql-connector-java</artifactId>
		  <version>5.1.6</version>
		</dependency>
		<!-- 连接池 -->
		<dependency>
		    <groupId>com.alibaba</groupId>
		    <artifactId>druid</artifactId>
		    <version>1.1.0</version>
		</dependency>
		<!-- mybatis插件 -->
		 <dependency>
            <groupId>org.mybatis.generator</groupId>
            <artifactId>mybatis-generator-core</artifactId>
            <version>1.3.7</version>
        </dependency>
        <!-- 如不 引用@Param注解无法使用 -->
        <dependency>
		  <groupId>org.apache.ibatis</groupId>
		  <artifactId>ibatis-core</artifactId>
		  <version>3.0</version>
		</dependency>
		<dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
        </dependency>
	</dependencies>
</project>

【配置application.yml文件】

注：将application.properties改后缀名为.yml

server:
  port: 80 #端口号
  tomcat:
    uri-encoding: UTF-8  #编码格式
  
spring:
  datasource:
    url: jdbc:mysql://localhost:3306/demo?characterEncoding=UTF-8 #数据库地址
    username: root  #用户名
    password: root  #密码
    driver-class-name: com.mysql.jdbc.Driver #数据库驱动
    type: com.alibaba.druid.pool.DruidDataSource #连接池
mybatis:
  mapper-locations: classpath:mapper/*Mapper.xml  #mapper映射xml文件的所在路径(一般都在resources目录下，*代表任意字符)
  type-aliases-package: com.cn.model # 实体类存放路径

【使用Mybatis逆向工程生成Dao与 映射文件】

参考【MyBatis】MyBatis逆向工程mybatis-generator的使用（MySql）

【controller】

@RestController：用在类上 ，声明充当控制层
@RequestMapping：用在类上，表示为 命名空间；用在方法上，表示为访问的方法名；
@Resource：按属性注入Bean的方式

package com.cn.demo.user.controller;

import java.util.List;

import javax.annotation.Resource;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.cn.demo.model.User;
import com.cn.demo.user.service.UserService;

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

	@Resource
	private UserService userService;
	
	@RequestMapping("/queryUserList")
	public List<User> queryUserList() {
		List<User> userList = userService.queryUserList();
		return userList;
	}
}

【service】

package com.cn.demo.user.service;

import java.util.List;

import com.cn.demo.model.User;

public interface UserService {

	List<User> queryUserList();

}

【Service Impl】

@Service()：里面的值必须与Controller中保持一致

package com.cn.demo.user.service.impl;

import java.util.List;

import javax.annotation.Resource;

import org.springframework.stereotype.Service;

import com.cn.demo.model.User;
import com.cn.demo.user.dao.UserMapper;
import com.cn.demo.user.service.UserService;

@Service("userService")
public class UserServiceImpl implements UserService {

	@Resource
	private UserMapper userMapper;
	
	@Override
	public List<User> queryUserList() {
		// TODO Auto-generated method stub
		List<User> userList = userMapper.selectByExample(null);
		return userList;
	}
}

【dao】

package com.cn.demo.user.dao;

import com.cn.demo.model.User;
import com.cn.demo.model.UserExample;
import java.util.List;
import org.apache.ibatis.annotations.Param;

public interface UserMapper {
    int countByExample(UserExample example);

    int deleteByExample(UserExample example);

    int insert(User record);

    int insertSelective(User record);

    List<User> selectByExample(UserExample example);

    int updateByExampleSelective(@Param("record") User record, @Param("example") UserExample example);

    int updateByExample(@Param("record") User record, @Param("example") UserExample example);
}

【mapper.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.cn.demo.user.dao.UserMapper" >
  <resultMap id="BaseResultMap" type="com.cn.demo.model.User" >
    <result column="user_id" property="userId" jdbcType="VARCHAR" />
    <result column="user_name" property="userName" jdbcType="VARCHAR" />
    <result column="user_sex" property="userSex" jdbcType="INTEGER" />
  </resultMap>
  <sql id="Example_Where_Clause" >
    <where >
      <foreach collection="oredCriteria" item="criteria" separator="or" >
        <if test="criteria.valid" >
          <trim prefix="(" suffix=")" prefixOverrides="and" >
            <foreach collection="criteria.criteria" item="criterion" >
              <choose >
                <when test="criterion.noValue" >
                  and ${criterion.condition}
                </when>
                <when test="criterion.singleValue" >
                  and ${criterion.condition} #{criterion.value}
                </when>
                <when test="criterion.betweenValue" >
                  and ${criterion.condition} #{criterion.value} and #{criterion.secondValue}
                </when>
                <when test="criterion.listValue" >
                  and ${criterion.condition}
                  <foreach collection="criterion.value" item="listItem" open="(" close=")" separator="," >
                    #{listItem}
                  </foreach>
                </when>
              </choose>
            </foreach>
          </trim>
        </if>
      </foreach>
    </where>
  </sql>
  <sql id="Update_By_Example_Where_Clause" >
    <where >
      <foreach collection="example.oredCriteria" item="criteria" separator="or" >
        <if test="criteria.valid" >
          <trim prefix="(" suffix=")" prefixOverrides="and" >
            <foreach collection="criteria.criteria" item="criterion" >
              <choose >
                <when test="criterion.noValue" >
                  and ${criterion.condition}
                </when>
                <when test="criterion.singleValue" >
                  and ${criterion.condition} #{criterion.value}
                </when>
                <when test="criterion.betweenValue" >
                  and ${criterion.condition} #{criterion.value} and #{criterion.secondValue}
                </when>
                <when test="criterion.listValue" >
                  and ${criterion.condition}
                  <foreach collection="criterion.value" item="listItem" open="(" close=")" separator="," >
                    #{listItem}
                  </foreach>
                </when>
              </choose>
            </foreach>
          </trim>
        </if>
      </foreach>
    </where>
  </sql>
  <sql id="Base_Column_List" >
    user_id, user_name, user_sex
  </sql>
  <select id="selectByExample" resultMap="BaseResultMap" parameterType="com.cn.demo.model.UserExample" >
    select
    <if test="distinct" >
      distinct
    </if>
    'true' as QUERYID,
    <include refid="Base_Column_List" />
    from t_user
    <if test="_parameter != null" >
      <include refid="Example_Where_Clause" />
    </if>
    <if test="orderByClause != null" >
      order by ${orderByClause}
    </if>
  </select>
  <delete id="deleteByExample" parameterType="com.cn.demo.model.UserExample" >
    delete from t_user
    <if test="_parameter != null" >
      <include refid="Example_Where_Clause" />
    </if>
  </delete>
  <insert id="insert" parameterType="com.cn.demo.model.User" >
    insert into t_user (user_id, user_name, user_sex
      )
    values (#{userId,jdbcType=VARCHAR}, #{userName,jdbcType=VARCHAR}, #{userSex,jdbcType=INTEGER}
      )
  </insert>
  <insert id="insertSelective" parameterType="com.cn.demo.model.User" >
    insert into t_user
    <trim prefix="(" suffix=")" suffixOverrides="," >
      <if test="userId != null" >
        user_id,
      </if>
      <if test="userName != null" >
        user_name,
      </if>
      <if test="userSex != null" >
        user_sex,
      </if>
    </trim>
    <trim prefix="values (" suffix=")" suffixOverrides="," >
      <if test="userId != null" >
        #{userId,jdbcType=VARCHAR},
      </if>
      <if test="userName != null" >
        #{userName,jdbcType=VARCHAR},
      </if>
      <if test="userSex != null" >
        #{userSex,jdbcType=INTEGER},
      </if>
    </trim>
  </insert>
  <select id="countByExample" parameterType="com.cn.demo.model.UserExample" resultType="java.lang.Integer" >
    select count(*) from t_user
    <if test="_parameter != null" >
      <include refid="Example_Where_Clause" />
    </if>
  </select>
  <update id="updateByExampleSelective" parameterType="map" >
    update t_user
    <set >
      <if test="record.userId != null" >
        user_id = #{record.userId,jdbcType=VARCHAR},
      </if>
      <if test="record.userName != null" >
        user_name = #{record.userName,jdbcType=VARCHAR},
      </if>
      <if test="record.userSex != null" >
        user_sex = #{record.userSex,jdbcType=INTEGER},
      </if>
    </set>
    <if test="_parameter != null" >
      <include refid="Update_By_Example_Where_Clause" />
    </if>
  </update>
  <update id="updateByExample" parameterType="map" >
    update t_user
    set user_id = #{record.userId,jdbcType=VARCHAR},
      user_name = #{record.userName,jdbcType=VARCHAR},
      user_sex = #{record.userSex,jdbcType=INTEGER}
    <if test="_parameter != null" >
      <include refid="Update_By_Example_Where_Clause" />
    </if>
  </update>
</mapper>

【启动类：SpringbootDemoApplication】

@SpringBootApplication：声明是一个启动类
@MapperScan()：动态是扫描映射文件

package com.cn.demo;

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

@SpringBootApplication
@MapperScan("com.cn.demo.*.dao")
public class SpringbootDemoApplication {

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

【访问项目】

通过main方法启动SpringbootDemoApplication类
在浏览器地址输入http://localhost/user/queryUserList就可以访问了。

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