Spring boot Mybatis 整合(完整版)

网友投稿 259 2023-01-22


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:

xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

4.0.0

com.winter

springboot-mybatis-demo

0.0.1-SNAPSHOT

jar

springboot-mybatis-demo

Demo project for Spring Boot

org.springframework.boot

spring-boot-starter-parent

1.5.6.RELEASE

UTF-8

UTF-8

1.7

org.mybatis.spring.boot

mybatis-spring-boot-starter

1.3.0

org.springframework.boot

spring-boot-starter-thymeleaf

org.springframework.boot

spring-boot-starter-web

org.springframework.boot

spring-boot-starter-test

test

mysql

mysql-connector-java

5.1.35

com.fasterxml.jackson.core

jackson-core

com.fasterxml.jackson.core

jackson-databind

com.fasterxml.jackson.datatype

jackson-datatype-joda

com.fasterxml.jackson.module

jackson-module-parameter-names

com.github.pagehelper

pagehelper-spring-boot-starter

1.1.2

com.alibaba

druid-spring-boot-starter

1.1.0

org.springframework.boot

spring-boot-maven-plugin

org.mybatis.generator

mybatis-generator-maven-plugin

1.3.2

${basedir}/src/main/resources/generator/generatorConfig.xml

true

true

xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

4.0.0

com.winter

springboot-mybatis-demo

0.0.1-SNAPSHOT

jar

springboot-mybatis-demo

Demo project for Spring Boot

org.springframework.boot

spring-boot-starter-parent

1.5.6.RELEASE

UTF-8

UTF-8

1.7

org.mybatis.spring.boot

mybatis-spring-boot-starter

1.3.0

org.springframework.boot

spring-boot-starter-thymeleaf

org.springframework.boot

spring-boot-starter-web

org.springframework.boot

spring-boot-starter-test

test

mysql

mysql-connector-java

5.1.35

com.fasterxml.jackson.core

jackson-core

com.fasterxml.jackson.core

jackson-databind

com.fasterxml.jackson.datatype

jackson-datatype-joda

com.fasterxml.jackson.module

jackson-module-parameter-names

com.github.pagehelper

pagehelper-spring-boot-starter

1.1.2

com.alibaba

druid-spring-boot-starter

1.1.0

org.springframework.boot

spring-boot-maven-plugin

org.mybatis.generator

mybatis-generator-maven-plugin

1.3.2

${basedir}/src/main/resources/generator/generatorConfig.xml

true

true

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

PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"

"http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">

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 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

user_id, user_name, password, phone

select

from t_user

where user_id = #{userId,jdbcType=INTEGER}

select

from t_user

delete from t_user

where user_id = #{userId,jdbcType=INTEGER}

insert into t_user (user_id, user_name, password,

phone)

values (#{userId,jdbcType=INTEGER}, #{userName,jdbcType=VARCHAR}, #{password,jdbcType=VARCHAR},

#{phone,jdbcType=VARCHAR})

insert into t_user

user_id,

user_name,

password,

phone,

#{userId,jdbcType=INTEGER},

#{userName,jdbcType=VARCHAR},

#{password,jdbcType=VARCHAR},

#{phone,jdbcType=VARCHAR},

update t_user

user_name = #{userName,jdbcType=VARCHAR},

password = #{password,jdbcType=VARCHAR},

phone = #{phone,jdbcType=VARCHAR},

where user_id = #{userId,jdbcType=INTEGER}

update t_user

set user_name = #{userName,jdbcType=VARCHAR},

password = #{password,jdbcType=VARCHAR},

phone = #{phone,jdbcType=VARCHAR}

where user_id = #{userId,jdbcType=INTEGER}

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 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 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

以上所述是给大家介绍的Spring boot Mybatis 整合(完整版),希望对大家有所帮助,如果大家有任何疑问请给我留言,会及时回复大家的。在此也非常感谢大家对我们网站的支持!


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