springboot集成mybatis

springboot如何配置web项目请参考前一章，在此基础上集成mybatis。

在pom文件中添加mybatis的依赖：

    <dependency>
      <groupId>org.mybatis.spring.boot</groupId>
      <artifactId>mybatis-spring-boot-starter</artifactId>
      <version>1.2.0</version>
    </dependency>

添加mysql驱动：

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

添加druid和fastjson依赖，使用阿里巴巴druid连接池

    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>druid</artifactId>
      <version>1.0.28</version>
    </dependency>

    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>fastjson</artifactId>
      <version>1.2.30</version>
    </dependency>

配置数据源，在application.yml中：

spring:
    datasource:
        name: test
        url: jdbc:mysql://127.0.0.1:3306/test
        username: root
        password: 111111
        # 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

设置mybatis的mapper和model扫描路径：

mybatis:
    mapperLocations: classpath:mapper/*.xml
    typeAliasesPackage: com.yingxinhuitong.demo.model
#更多配置请参见：http://www.mybatis.org/spring-boot-starter/mybatis-spring-boot-autoconfigure/

接下来我们新建userMapper.xml,UserEntity以及UserDao：

package com.yingxinhuitong.demo.model;

/**
 * Created by jack on 2017/4/20.
 */
public class UserEntity {
  private Long id;
  private String username;
  private String password;

  public Long getId() {
    return id;
  }

  public void setId(Long id) {
    this.id = id;
  }

  public String getUsername() {
    return username;
  }

  public void setUsername(String username) {
    this.username = username;
  }

  public String getPassword() {
    return password;
  }

  public void setPassword(String password) {
    this.password = password;
  }
}

package com.yingxinhuitong.demo.dao;

import com.yingxinhuitong.demo.model.UserEntity;
import org.apache.ibatis.annotations.Mapper;

import java.util.List;

/**
 * Created by jack on 2017/4/20.
 */
@Mapper
public interface UserDao {
  List<UserEntity> searchAll();
}

<?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.yingxinhuitong.demo.dao.UserDao" >
  <!-- 字段与实体的映射 -->
  <resultMap id="BaseResultMap" type="com.yingxinhuitong.demo.model.UserEntity">
    <id column="id" property="id" jdbcType="BIGINT" />
    <result column="username" property="username" jdbcType="VARCHAR" />
    <result column="password" property="password" jdbcType="VARCHAR" />
  </resultMap>
  <!-- 根据条件查询，全部 -->
  <select id="searchAll" resultMap="BaseResultMap">
    select * from tab_user
  </select>

</mapper>

创建一个控制器，注入UserDao，测试一下可不可以查询数据了：

@RestController
public class TestController {

  @Resource
  UserDao userDao;

  @RequestMapping("/getusers")
  public String test() {
    List<UserEntity> users = userDao.searchAll();
    String usersJson = JSON.toJSONString(users);
    return usersJson;
  }
}

运行Application.class,启动成功后访问：http://localhost:9000/demo/getusers,输出内容如下：

[{"id":1,"password":"000000","username":"test"},{"id":2,"password":"111111","username":"test1"},{"id":3,"password":"222222","username":"test2"}]

至此，springboot已完成对mybatis的集成。

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