第五章 springboot + mybatis

<!-- 与数据库操作相关的依赖 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>

        <!-- 使用数据源 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.0.14</version>
        </dependency>
        
        <!-- mysql -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        
        <!-- mybatis -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.2.8</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.2.2</version>
         </dependency>

jdbc.driverClassName = com.mysql.jdbc.Driver
jdbc.url = jdbc:mysql://xxx:3306/mytestdb?zeroDateTimeBehavior=convertToNull&useUnicode=true&characterEncoding=utf-8
jdbc.username = root
jdbc.password = vvvxxx

mybatis.typeAliasesPackage=com.xxx.firstboot.domain  
mybatis.mapperLocations=classpath:mapper/*.xml

package com.xxx.firstboot.common;

import java.util.Properties;

import javax.sql.DataSource;

import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.env.Environment;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;

import com.alibaba.druid.pool.DruidDataSourceFactory;

/**
 * springboot集成mybatis的基本入口
 * 1）创建数据源
 * 2）创建SqlSessionFactory
 */
@Configuration    //该注解类似于spring配置文件
@MapperScan(basePackages="com.xxx.firstboot.mapper")
public class MyBatisConfig {
    
    @Autowired
    private Environment env;
    
    /**
     * 创建数据源
     * @Primary 该注解表示在同一个接口有多个实现类可以注入的时候，默认选择哪一个，而不是让@autowire注解报错 
     */
    @Bean
    //@Primary
    public DataSource getDataSource() throws Exception{
        Properties props = new Properties();
        props.put("driverClassName", env.getProperty("jdbc.driverClassName"));
        props.put("url", env.getProperty("jdbc.url"));
        props.put("username", env.getProperty("jdbc.username"));
        props.put("password", env.getProperty("jdbc.password"));
        return DruidDataSourceFactory.createDataSource(props);
    }

    /**
     * 根据数据源创建SqlSessionFactory
     */
    @Bean
    public SqlSessionFactory sqlSessionFactory(DataSource ds) throws Exception{
        SqlSessionFactoryBean fb = new SqlSessionFactoryBean();
        fb.setDataSource(ds);//指定数据源(这个必须有，否则报错)
        //下边两句仅仅用于*.xml文件，如果整个持久层操作不需要使用到xml文件的话（只用注解就可以搞定），则不加
        fb.setTypeAliasesPackage(env.getProperty("mybatis.typeAliasesPackage"));//指定基包
        fb.setMapperLocations(new PathMatchingResourcePatternResolver().getResources(env.getProperty("mybatis.mapperLocations")));//指定xml文件位置
        
        return fb.getObject();
    }

}

package com.xxx.firstboot.mapper;

import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Param;

import com.xxx.firstboot.domain.User;

public interface UserMapper {
    
    @Insert("INSERT INTO tb_user(username, password) VALUES(#{username},#{password})")
    public int insertUser(@Param("username") String username, @Param("password")  String password);
    
    /**
     * 插入用户，并将主键设置到user中
     * 注意：返回的是数据库影响条数，即1
     */
    public int insertUserWithBackId(User user);
}

<?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">

<!-- 指定工作空间，要与接口名相同，源代码没有去看，猜测应该是通过"这里的namespace.下边方法的id"来定位方法的 -->
<mapper namespace="com.xxx.firstboot.mapper.UserMapper">
    
    <!-- 若不需要自动返回主键，将useGeneratedKeys="true" keyProperty="id"去掉即可(当然如果不需要自动返回主键，直接用注解即可) -->
    <insert id="insertUserWithBackId" parameterType="User" useGeneratedKeys="true" keyProperty="id" >
       <![CDATA[
       INSERT INTO tb_user 
       (
           username,
           password
       )
       VALUES
       (
           #{username, jdbcType=VARCHAR},
           #{password, jdbcType=VARCHAR}
       )
       ]]>
   </insert>
    
</mapper>

package com.xxx.firstboot.dao;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;

import com.xxx.firstboot.domain.User;
import com.xxx.firstboot.mapper.UserMapper;

@Repository
public class UserDao {
    
    @Autowired
    private UserMapper userMapper;
    
    public int insertUser(String username, String password){
        return userMapper.insertUser(username, password);
    }
    
    public int insertUserWithBackId(User user){    
        return userMapper.insertUserWithBackId(user);
    }
    
}

package com.xxx.firstboot.service;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.xxx.firstboot.dao.UserDao;
import com.xxx.firstboot.domain.User;

@Service
public class UserService {
    
    @Autowired
    private UserDao userDao;
    
    public boolean addUser(String username, String password){
        return userDao.insertUser(username, password)==1?true:false;
    }
    
    public User addUserWithBackId(String username, String password){
        User user = new User();
        user.setUsername(username);
        user.setPassword(password);
        userDao.insertUserWithBackId(user);//该方法后，主键已经设置到user中了
        return user;
    }
    
}

package com.xxx.firstboot.web;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import com.xxx.firstboot.domain.User;
import com.xxx.firstboot.service.UserService;

import io.swagger.annotations.Api;
import io.swagger.annotations.ApiImplicitParam;
import io.swagger.annotations.ApiImplicitParams;
import io.swagger.annotations.ApiOperation;
import io.swagger.annotations.ApiResponse;
import io.swagger.annotations.ApiResponses;

@RestController
@RequestMapping("/user")
@Api("userController相关api")
public class UserController {

    @Autowired
    private UserService userService;
    
    @ApiOperation("添加用户")
    @ApiImplicitParams({
        @ApiImplicitParam(paramType="query",name="username",dataType="String",required=true,value="用户的姓名",defaultValue="zhaojigang"),
        @ApiImplicitParam(paramType="query",name="password",dataType="String",required=true,value="用户的密码",defaultValue="wangna")
    })
    @ApiResponses({
        @ApiResponse(code=400,message="请求参数没填好"),
        @ApiResponse(code=404,message="请求路径没有或页面跳转路径不对")
    })
    @RequestMapping(value="/addUser",method=RequestMethod.POST)
    public boolean addUser(@RequestParam("username") String username, 
                           @RequestParam("password") String password) {
        return userService.addUser(username,password);
    }
    
    @ApiOperation("添加用户且返回已经设置了主键的user实例")
    @ApiImplicitParams({
        @ApiImplicitParam(paramType="query",name="username",dataType="String",required=true,value="用户的姓名",defaultValue="zhaojigang"),
        @ApiImplicitParam(paramType="query",name="password",dataType="String",required=true,value="用户的密码",defaultValue="wangna")
    })
    @ApiResponses({
        @ApiResponse(code=400,message="请求参数没填好"),
        @ApiResponse(code=404,message="请求路径没有或页面跳转路径不对")
    })
    @RequestMapping(value="/addUserWithBackId",method=RequestMethod.POST)
    public User addUserWithBackId(@RequestParam("username") String username, 
                                     @RequestParam("password") String password) {
        return userService.addUserWithBackId(username, password);
    }
}