【2019年3月3日】springboot Mybatis 整合
springboot终于迎来了2.0版本,很多新的特性让springboot更加强大,之前使用1.5.6版本整合了Mybatis,现在2.0版本就已经不适用了,所以,在摸索中搭建了2.0版本整合Mybatis
写在前面
本来这篇博文老在就写好了,但是后来发现很多功能其实根本就没有检验通过就发出来了,导致遗留了很多坑,比如最难搞的就是SqlSessionFactory和PageHelper,之前写过关于springboot1.5.6版本的整合,这段时间刚好springboot发布了2.0的正式版本,很多同学可能没有注意版本,导致了整合的时候出现了很多很多的问题,这几天刚好有空就试着整合一下springboot2.0 mybatis,发现了很多很多的坑,而且网上的资源也不多,终于在两天的踩坑中成功整合了,并且将翻页功能修复好了,废话不多说了,看代码:
环境/版本一览:
- 开发工具:Intellij IDEA 2017.1.3
- springboot: 2.0.1.RELEASE
- jdk:1.8.0_40
- maven:3.3.9
- alibaba Druid 数据库连接池:1.1.9
额外功能:
- PageHelper 分页插件
- mybatis generator 自动生成代码插件(本次搭建就不讲解了,请参照Spring boot Mybatis 整合(完整版))
开始搭建:
创建项目:
添加基础的依赖:
依赖文件:
按照pom文件补齐需要的依赖:
<?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.winterchen</groupId>
<artifactId>springboot2-mybatis-demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>springboot2-mybatis-demo</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.1.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>1.8</java.version>
</properties>
<dependencies>
<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>1.3.2</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.4</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>1.2.5</version>
</dependency>
<!-- alibaba的druid数据库连接池 -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>1.1.9</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
项目结构:
项目启动类:
package com.winterchen;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
@MapperScan("com.winterchen.dao")
public class Springboot2MybatisDemoApplication {
public static void main(String[] args) {
SpringApplication.run(Springboot2MybatisDemoApplication.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
配置:
可以根据个人使用习惯选择使用
properties
或者yml
文件,本项目使用的是yml配置文件,所以把原本application.properties
删除,创建一个application.yml
文件
在resource文件夹下创建application.yml
server:
port: 8080
spring:
datasource:
name: mysql_test
type: com.alibaba.druid.pool.DruidDataSource
#druid相关配置
druid:
#监控统计拦截的filters
filters: stat
driver-class-name: com.mysql.jdbc.Driver
#基本属性
url: jdbc:mysql://127.0.0.1:3306/mytest?useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true
username: root
password: root
#配置初始化大小/最小/最大
initial-size: 1
min-idle: 1
max-active: 20
#获取连接等待超时时间
max-wait: 60000
#间隔多久进行一次检测,检测需要关闭的空闲连接
time-between-eviction-runs-millis: 60000
#一个连接在池中最小生存的时间
min-evictable-idle-time-millis: 300000
validation-query: SELECT 'x'
test-while-idle: true
test-on-borrow: false
test-on-return: false
#打开PSCache,并指定每个连接上PSCache的大小。oracle设为true,mysql设为false。分库分表较多推荐设置为false
pool-prepared-statements: false
max-pool-prepared-statement-per-connection-size: 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:mapper/*.xml #注意:一定要对应mapper映射xml文件的所在路径
type-aliases-package: com.winterchen.model # 注意:对应实体类的路径
#pagehelper
pagehelper:
helperDialect: mysql
reasonable: true
supportMethodsArguments: true
params: count=countSql
returnPageInfo: check
创建包:
model
,dao
,mapper
创建数据库和数据表
CREATE DATABASE mytest;
CREATE TABLE t_user(
userId INT NOT NULL PRIMARY KEY AUTO_INCREMENT,
userName VARCHAR(255) NOT NULL ,
password VARCHAR(255) NOT NULL ,
phone VARCHAR(255) NOT NULL
) ENGINE=INNODB AUTO_INCREMENT=1000 DEFAULT CHARSET=utf8;
创建实体类:UserDomain.java
package com.winterchen.model;
public class UserDomain {
private Integer userId;
private String userName;
private String password;
private String phone;
// get,set方法略...
}
创建dao:
UserDao.java
package com.winterchen.dao;
import com.winterchen.model.UserDomain;
import org.apache.ibatis.annotations.Mapper;
import java.util.List;
public interface UserDao {
int insert(UserDomain record);
List<UserDomain> selectUsers();
}
创建mybatis映射文件: 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.winterchen.dao.UserDao" >
<sql id="BASE_TABLE">
t_user
</sql>
<sql id="BASE_COLUMN">
userId,userName,password,phone
</sql>
<insert id="insert" parameterType="com.winterchen.model.UserDomain">
INSERT INTO
<include refid="BASE_TABLE"/>
<trim prefix="(" suffix=")" suffixOverrides=",">
userName,password,
<if test="phone != null">
phone,
</if>
</trim>
<trim prefix="VALUES(" suffix=")" suffixOverrides=",">
#{userName, jdbcType=VARCHAR},#{password, jdbcType=VARCHAR},
<if test="phone != null">
#{phone, jdbcType=VARCHAR},
</if>
</trim>
</insert>
<select id="selectUsers" resultType="com.winterchen.model.UserDomain">
SELECT
<include refid="BASE_COLUMN"/>
FROM
<include refid="BASE_TABLE"/>
</select>
</mapper>
注意:<mapper namespace="com.winterchen.dao.UserDao" >
一定要对应自己dao所在的包路径
创建剩余的controller
,service
包和文件
UserService.java
package com.winterchen.service.user;
import com.github.pagehelper.PageInfo;
import com.winterchen.model.UserDomain;
import java.util.List;
/** * Created by Administrator on 2018/4/19. */
public interface UserService {
int addUser(UserDomain user);
PageInfo<UserDomain> findAllUser(int pageNum, int pageSize);
}
UserServiceImpl
package com.winterchen.service.user.impl;
import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import com.winterchen.dao.UserDao;
import com.winterchen.model.UserDomain;
import com.winterchen.service.user.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 UserDao userDao;//这里会报错,但是并不会影响
@Override
public int addUser(UserDomain user) {
return userDao.insert(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 PageInfo<UserDomain> 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);
List<UserDomain> userDomains = userDao.selectUsers();
PageInfo result = new PageInfo(userDomains);
return result;
}
}
UserController.java
package com.winterchen.controller;
import com.github.pagehelper.PageHelper;
import com.winterchen.model.UserDomain;
import com.winterchen.service.user.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;
/** * Created by Administrator on 2017/8/16. */
@Controller
@RequestMapping(value = "/user")
public class UserController {
@Autowired
private UserService userService;
@ResponseBody
@PostMapping("/add")
public int addUser(UserDomain user){
return userService.addUser(user);
}
@ResponseBody
@GetMapping("/all")
public Object findAllUser(
@RequestParam(name = "pageNum", required = false, defaultValue = "1")
int pageNum,
@RequestParam(name = "pageSize", required = false, defaultValue = "10")
int pageSize){
return userService.findAllUser(pageNum,pageSize);
}
}
项目最终的结构
到这里如果项目就成功搭建完成了,如果还是报错的话,请仔细看看配置,后面会给出源码地址,程序员就是要不断和bug进行斗争,加油。
测试
启动项目
这样就表示启动成功了
然后,开始测试吧,博主使用的是postMan,一个进行http请求的测试工具
添加数据
查询数据
加油撸代码,早日成为王者的男人!
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