Spring boot Mybatis 整合（完整版）

本项目使用的环境：

开发工具：

• Intellij IDEA 2017.1.3

• springboot: 1.5.6

• jdk：1.8.0_161

• maven:3.3.9

额外功能

• PageHelper 分页插件

• mybatis generator

自动生成代码插件

步骤：

1.创建一个springboot项目：

2.创建项目的文件结构以及jdk的版本

3.选择项目所需要的依赖

然后点击finish

5.看一下文件的结构：

6.查看一下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>
<groupId>com.winter</groupId>
<artifactId>springboot-mybatis-demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>springboot-mybatis-demo</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.6.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.7</java.version>
</properties>
<dependencies>
<dependency>
 <groupId>org.mybatis.spring.boot</groupId>
 <artifactId>mybatis-spring-boot-starter</artifactId>
 <version>1.3.0</version>
</dependency>
<dependency>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<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>mysql</groupId>
 <artifactId>mysql-connector-java</artifactId>
 <version>5.1.35</version>
</dependency>
<dependency>
 <groupId>com.fasterxml.jackson.core</groupId>
 <artifactId>jackson-core</artifactId>
</dependency>
<dependency>
 <groupId>com.fasterxml.jackson.core</groupId>
 <artifactId>jackson-databind</artifactId>
</dependency>
<dependency>
 <groupId>com.fasterxml.jackson.datatype</groupId>
 <artifactId>jackson-datatype-joda</artifactId>
</dependency>
<dependency>
 <groupId>com.fasterxml.jackson.module</groupId>
 <artifactId>jackson-module-parameter-names</artifactId>
</dependency>
<!-- 分页插件 -->
<dependency>
 <groupId>com.github.pagehelper</groupId>
 <artifactId>pagehelper-spring-boot-starter</artifactId>
 <version>1.1.2</version>
</dependency>
<!-- alibaba的druid数据库连接池 -->
<dependency>
 <groupId>com.alibaba</groupId>
 <artifactId>druid-spring-boot-starter</artifactId>
 <version>1.1.0</version>
</dependency>
</dependencies>
<build>
<plugins>
 <plugin>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-maven-plugin</artifactId>
 </plugin>
 <!-- mybatis generator 自动生成代码插件 -->
 <plugin>
 <groupId>org.mybatis.generator</groupId>
 <artifactId>mybatis-generator-maven-plugin</artifactId>
 <version>1.3.2</version>
 <configuration>
  <configurationFile>${basedir}/src/main/resources/generator/generatorConfig.xml</configurationFile>
  <overwrite>true</overwrite>
  <verbose>true</verbose>
 </configuration>
 </plugin>
</plugins>
</build>
</project>

7.项目不使用application.properties文件 而使用更加简洁的application.yml文件：
将原有的resource文件夹下的application.properties文件删除，创建一个新的application.yml配置文件，
文件的内容如下：

server:
port: 8080
spring:
datasource:
name: test
url: jdbc:mysql://127.0.0.1:3306/depot
username: root
password: root
# 使用druid数据源
type: com.alibaba.druid.pool.DruidDataSource
driver-class-name: com.mysql.jdbc.Driver
filters: stat
maxActive: 20
initialSize: 1
maxWait: 60000
minIdle: 1
timeBetweenEvictionRunsMillis: 60000
minEvictableIdleTimeMillis: 300000
validationQuery: select 'x'
testWhileIdle: true
testOnBorrow: false
testOnReturn: false
poolPreparedStatements: true
maxOpenPreparedStatements: 20
## 该配置节点为独立的节点，有很多同学容易将这个配置放在spring的节点下，导致配置无法被识别
mybatis:
mapper-locations: classpath:mapping/*.xml #注意：一定要对应mapper映射xml文件的所在路径
type-aliases-package: com.winter.model # 注意：对应实体类的路径
#pagehelper分页插件
pagehelper:
helperDialect: mysql
reasonable: true
supportMethodsArguments: true
params: count=countSql

8.创建数据库：

CREATE DATABASE mytest;
CREATE TABLE t_user(
user_id INT NOT NULL PRIMARY KEY AUTO_INCREMENT,
user_name VARCHAR(255) NOT NULL ,
password VARCHAR(255) NOT NULL ,
phone VARCHAR(255) NOT NULL
) ENGINE=INNODB AUTO_INCREMENT=1000 DEFAULT CHARSET=utf8;

9.使用mybatis generator 自动生成代码：

配置pom.xml中generator 插件所对应的配置文件 ${basedir}/src/main/resources/generator/generatorConfig.xml

<?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="E:\developer\mybatis-generator-core-1.3.2\lib\mysql-connector-java-5.1.25-bin.jar"/>
<context id="DB2Tables" targetRuntime="MyBatis3">
<commentGenerator>
 <property name="suppressDate" value="true"/>
 <!-- 是否去除自动生成的注释 true：是 ： false:否 -->
 <property name="suppressAllComments" value="true"/>
</commentGenerator>
<!--数据库链接URL，用户名、密码 -->
<jdbcConnection driverClass="com.mysql.jdbc.Driver" connectionURL="jdbc:mysql://127.0.0.1/mytest" userId="root" password="root">
</jdbcConnection>
<javaTypeResolver>
 <property name="forceBigDecimals" value="false"/>
</javaTypeResolver>
<!-- 生成模型的包名和位置-->
<javaModelGenerator targetPackage="com.winter.model" targetProject="src/main/java">
 <property name="enableSubPackages" value="true"/>
 <property name="trimStrings" value="true"/>
</javaModelGenerator>
<!-- 生成映射文件的包名和位置-->
<sqlMapGenerator targetPackage="mapping" targetProject="src/main/resources">
 <property name="enableSubPackages" value="true"/>
</sqlMapGenerator>
<!-- 生成DAO的包名和位置-->
<javaClientGenerator type="XMLMAPPER" targetPackage="com.winter.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="t_user" domainObjectName="User" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>
</context>
</generatorConfiguration>

点击run-Edit Configurations

添加配置

运行

注意！！！同一张表一定不要运行多次，因为mapper的映射文件中会生成多次的代码，导致报错，切记

最后生成的文件以及结构：

10. 生成的文件

UserMapper.java

package com.winter.mapper;
import com.winter.model.User;
public interface UserMapper {
int deleteByPrimaryKey(Integer userId);
int insert(User record);
int insertSelective(User record);
User selectByPrimaryKey(Integer userId);
int updateByPrimaryKeySelective(User record);
int updateByPrimaryKey(User record);
//这个方式我自己加的
List<User> selectAllUser();
}

User.java

package com.winter.model;
public class User {
private Integer userId;
private String userName;
private String password;
private String phone;
public Integer getUserId() {
return userId;
}
public void setUserId(Integer userId) {
this.userId = userId;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName == null ? null : userName.trim();
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password == null ? null : password.trim();
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone == null ? null : phone.trim();
}
}

对于sql语句这种黄色的背景，真心是看不下去了（解决方案）：

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.winter.mapper.UserMapper" >
<resultMap id="BaseResultMap" type="com.winter.model.User" >
<id column="user_id" property="userId" jdbcType="INTEGER" />
<result column="user_name" property="userName" jdbcType="VARCHAR" />
<result column="password" property="password" jdbcType="VARCHAR" />
<result column="phone" property="phone" jdbcType="VARCHAR" />
</resultMap>
<sql id="Base_Column_List" >
user_id, user_name, password, phone
</sql>
<select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.Integer" >
select
<include refid="Base_Column_List" />
from t_user
where user_id = #{userId,jdbcType=INTEGER}
</select>
<!-- 这个方法是我自己加的 -->
<select id="selectAllUser" resultMap="BaseResultMap">
select
<include refid="Base_Column_List" />
from t_user
</select>
<delete id="deleteByPrimaryKey" parameterType="java.lang.Integer" >
delete from t_user
where user_id = #{userId,jdbcType=INTEGER}
</delete>
<insert id="insert" parameterType="com.winter.model.User" >
insert into t_user (user_id, user_name, password,
phone)
values (#{userId,jdbcType=INTEGER}, #{userName,jdbcType=VARCHAR}, #{password,jdbcType=VARCHAR},
#{phone,jdbcType=VARCHAR})
</insert>
<insert id="insertSelective" parameterType="com.winter.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="password != null" >
password,
</if>
<if test="phone != null" >
phone,
</if>
</trim>
<trim prefix="values (" suffix=")" suffixOverrides="," >
<if test="userId != null" >
#{userId,jdbcType=INTEGER},
</if>
<if test="userName != null" >
#{userName,jdbcType=VARCHAR},
</if>
<if test="password != null" >
#{password,jdbcType=VARCHAR},
</if>
<if test="phone != null" >
#{phone,jdbcType=VARCHAR},
</if>
</trim>
</insert>
<update id="updateByPrimaryKeySelective" parameterType="com.winter.model.User" >
update t_user
<set >
<if test="userName != null" >
user_name = #{userName,jdbcType=VARCHAR},
</if>
<if test="password != null" >
password = #{password,jdbcType=VARCHAR},
</if>
<if test="phone != null" >
phone = #{phone,jdbcType=VARCHAR},
</if>
</set>
where user_id = #{userId,jdbcType=INTEGER}
</update>
<update id="updateByPrimaryKey" parameterType="com.winter.model.User" >
update t_user
set user_name = #{userName,jdbcType=VARCHAR},
password = #{password,jdbcType=VARCHAR},
phone = #{phone,jdbcType=VARCHAR}
where user_id = #{userId,jdbcType=INTEGER}
</update>
</mapper>

11.打开类SpringbootMybatisDemoApplication.java，这个是springboot的启动类。我们需要添加点东西：

package com.winter;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
@MapperScan("com.winter.mapper")//将项目中对应的mapper类的路径加进来就可以了
public class SpringbootMybatisDemoApplication {
public static void main(String[] args) {
SpringApplication.run(SpringbootMybatisDemoApplication.class, args);
}
}

注意：@MapperScan("com.winter.mapper")这个注解非常的关键，这个对应了项目中mapper（dao）所对应的包路径，很多同学就是这里忘了加导致异常的

12.到这里所有的搭建工作都完成了，接下来就是测试的工作，没使用junit4进行测试：
首先看一下完成之后的文件的结构：

现在controller，service层的代码都写好：

UserController.java

package com.winter.Controller;
import com.winter.model.User;
import com.winter.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
/**
* Created by Administrator on 2017/8/16.
*/
@Controller
@RequestMapping(value = "/user")
public class UserController {
@Autowired
private UserService userService;
@ResponseBody
@RequestMapping(value = "/add", produces = {"application/json;charset=UTF-8"})
public int addUser(User user){
return userService.addUser(user);
}
@ResponseBody
@RequestMapping(value = "/all/{pageNum}/{pageSize}", produces = {"application/json;charset=UTF-8"})
public Object findAllUser(@PathVariable("pageNum") int pageNum, @PathVariable("pageSize") int pageSize){
return userService.findAllUser(pageNum,pageSize);
}
}

UserService.java

package com.winter.service;
import com.winter.model.User;
import java.util.List;
/**
* Created by Administrator on 2017/8/16.
*/
public interface UserService {
int addUser(User user);
List<User> findAllUser(int pageNum, int pageSize);
}

UserServiceImpl.java

package com.winter.service.impl;
import com.github.pagehelper.PageHelper;
import com.winter.mapper.UserMapper;
import com.winter.model.User;
import com.winter.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
/**
* Created by Administrator on 2017/8/16.
*/
@Service(value = "userService")
public class UserServiceImpl implements UserService {
@Autowired
private UserMapper userMapper;//这里会报错，但是并不会影响
@Override
public int addUser(User user) {
return userMapper.insertSelective(user);
}
/*
* 这个方法中用到了我们开头配置依赖的分页插件pagehelper
* 很简单，只需要在service层传入参数，然后将参数传递给一个插件的一个静态方法即可；
* pageNum 开始页数
* pageSize 每页显示的数据条数
* */
@Override
public List<User> findAllUser(int pageNum, int pageSize) {
//将参数传给这个方法就可以实现物理分页了，非常简单。
PageHelper.startPage(pageNum, pageSize);
return userMapper.selectAllUser();
}
}

如果强迫症看不下去那个报错：（解决方法）

测试我使用了idea一个很用心的功能。

可以发http请求的插件：

点击左侧的运行按钮就可以发送请求了；

如果返回值正确 说明你已经搭建成功了！！

源码地址： https://github.com/WinterChenS/springboot-mybatis-demo

总结

以上所述是小编给大家介绍的Spring boot Mybatis 整合（完整版）网站的支持！

来源：https://blog.csdn.net/winter_chen001/article/details/77249029