SpringBoot入门——整合Mybatis

SpringBoot入门——整合Mybatis

springboot整合mybatis，只需要简单的配置就能整合在一起，这里写了个查询和插入小例子来演示如何调用mybatis。

1、配置pom.xml

先配置pom.xml，来引用spring和mybatis相关的jar包

<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.springboot</groupId>
<artifactId>spring-boot2</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>springboot</name>
<url>http://maven.apache.org</url>

<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.4.RELEASE</version>
</parent>

<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<java.version>1.8</java.version>
<!-- 管理jar包的版本号 -->
<mybatis-spring.version>1.3.0</mybatis-spring.version>
<mybatis-autoconfigure.version>1.3.0</mybatis-autoconfigure.version>
</properties>

<dependencies>
<!-- web支持 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>

<!-- Springboot devtools热部署 依赖包 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<optional>true</optional>
<scope>true</scope>
</dependency>

<!-- mybatis-spring依赖，包含mybatis和mybatis-spring等 -->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>${mybatis-spring.version}</version>
</dependency>

<!-- mysql驱动 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>

</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin </artifactId>
<configuration>
<!-- 如果没有该项配置，devtools不会起作用，即应用不会restart -->
<fork>true</fork>
</configuration>
</plugin>
</plugins>
</build>

</project>

2、创建mapper文件存放文件夹mapper

该文件夹用来放mybatis的mapper文件

3、创建mapper类及配置

(1)、创建mapper的接口类

有两种方式写Sql语句，一种是基于xml文件，另一种是基于注解，想详细了解请自行百度

包名：com.springboot.dao

类名：AdminDAO

package com.springboot.dao;

import java.util.List;
import java.util.Map;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;

@Mapper
public interface AdminDAO {

// 基于Mapper.xml写sql语句
public List<Map<String, Object>> selectAll();

// 基于注解方式写sql语句
@Insert("insert into account(name,money) values(#{name},#{money})")
int addAdmin(@Param("name") String name, @Param("money") String money);

}

(2)、创建mapper的配置类

创建此配置类的作用是在以后分布式搭建的时候，可以扫描每块mapper的包的位置

并且在加上此配置类后mapper类不加@Mapper注解也可以，只需此配置类中设定好mapper的包的位置

包名：com.springboot.dao;

类名：MapperConfig

package com.springboot.dao;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.context.annotation.Configuration;
/**
*
* 扫描本包的mapper
*
*/
@Configuration
@MapperScan("com.springboot.dao")
public class MapperConfig {

}

4、创建实体类

包名：com.springboot.entity;

类名：Admin

package com.springboot.entity;

public class Admin {
private Integer id;
private String name;
private String money;

public Admin() {}

public Admin(Integer id, String name, String money) {
super();
this.id = id;
this.name = name;
this.money = money;
}

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;
}

public String getMoney() {
return money;
}

public void setMoney(String money) {
this.money = money;
}

}

5、配置application.properties

只需要简单的几个配置就能行，如果需要配置其他参数，请自行查找相关资料

# 数据库连接
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/mysql?useUnicode=true&characterEncoding=utf-8
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

# 连接池配置
spring.datasource.max-idle=10
spring.datasource.max-wait=10000
spring.datasource.min-idle=5
spring.datasource.initial-size=5

# mybatis配置
# mybatis映射文件位置
mybatis.mapper-locations=classpath:/mapper/*Mapper.xml
# 实体类entity包位置
mybatis.type-aliases-package=com.springboot.entity

6、编写Mapper文件

编写mapper.xml，放入刚才创建的mapper文件夹下

<?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">

<!-- namespace必须指向Dao接口 -->
<mapper namespace="com.springboot.dao.AdminDAO">

<!-- 根据ID查询数据 -->
<select id="selectAll" resultType="map">
select
*
from
account
</select>

</mapper>

7、编写service

写对应的service业务处理层

(1)、service接口类：

包名：com.springboot.service

类名：AdminService

package com.springboot.service;

import java.util.List;
import java.util.Map;
//service接口类
public interface AdminService {

public List<Map<String,Object>> findAll();

public int addAdmin(String name,String money);
}

(2)、service实现类

包名：com.springboot.service.impl

类名：AdminServiceImpl

package com.springboot.service.impl;

import java.util.List;
import java.util.Map;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.springboot.dao.AdminDAO;
import com.springboot.service.AdminService;

@Service
//service接口的实现类
public class AdminServiceImpl implements AdminService{

@Autowired
private AdminDAO adminDAO;

// 查询方法
public List<Map<String, Object>> findAll() {
return adminDAO.selectAll();
}

// 插入方法
public int addAdmin(String name, String money) {
return adminDAO.addAdmin(name, money);
}

}

8、编写controller类

包名：com.springboot.controller

类名：AdminController

package com.springboot.controller;

import java.util.List;
import java.util.Map;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import com.springboot.service.AdminService;

@Controller
public class AdminController {
@Autowired
private AdminService adminService;

// 查询controller
@RequestMapping("/admin")
@ResponseBody
public List<Map<String, Object>> test(){
return adminService.findAll();
}

// 插入controller
@RequestMapping("/addAdmin")
@ResponseBody
public int addAdmin(@RequestParam("name") String name,@RequestParam("money") String money){
return adminService.addAdmin(name, money);
}

}

9、编写Main类

用来启动springboot的main类

包名：com.springboot

类名：ApplicationMain

package com.springboot;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.context.properties.EnableConfigurationProperties;

@SpringBootApplication
@EnableConfigurationProperties
public class ApplicationMain {

public static void main(String[] args) {
SpringApplication.run(ApplicationMain.class, args);
System.out.println("---------------OK----------------");
}

}

10、测试

测试1：

输入地址：http://localhost:8080/admin

如果显示一序列json信息则查询成功

测试2：

输入地址：http://localhost:8080/addAdmin?name=test&money=666

如果显示1，则代表插入一条记录成功

再输入：http://localhost:8080/admin

来查询刚才插入的内容