Spring Boot+Mybatis的整合过程

依赖配置

结合前面的内容，这里我们要嵌入数据库的操作，这里以操作MySQL为例整合Mybatis，首先需要在原来的基础上添加以下依赖

									<!-- mybatis依赖 -->

									<dependency>

									  <groupId>org.mybatis.spring.boot</groupId>

									  <artifactId>mybatis-spring-boot-starter</artifactId>

									  <version>1.1.1</version>

									</dependency>

当然啦，只依赖mybatis是不够的还需要依赖jdbc驱动以及返回json数据的json库(格式化数据)

									<!-- MySql驱动 -->

									<dependency>

									  <groupId>org.apache.tomcat</groupId>

									  <artifactId>tomcat-jdbc</artifactId>

									</dependency>

									<dependency>

									  <groupId>mysql</groupId>

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

									  <version>5.1.21</version>

									</dependency>

									<!--Json库的依赖 -->

									  <dependency>

									  <groupId>com.alibaba</groupId>

									  <artifactId>fastjson</artifactId>

									  <version>1.1.43</version>

									</dependency>

应用配置

接着需要在application.properties中添加数据库配置

									#JDBC配置

									spring.datasource.url=jdbc:mysql://127.0.0.1:3306/weibo?useUnicode=true&characterEncoding=gbk&zeroDateTimeBehavior=convertToNull

									spring.datasource.username=root

									spring.datasource.password=root

									spring.datasource.driver-class-name=com.mysql.jdbc.Driver

这里连接的数据库名叫weibo，其中表结构如下：

Spring Boot+Mybatis的整合过程

接下来就需要来具体的初始化MyBatis配置以及数据表的操作了，先看一下工程结构

Spring Boot+Mybatis的整合过程

编写配置类

数据库相关的DataSource，SqlSeesion配置，其中DataSourse的配置可以理解为解读application.properties中的jdbc相关配置然后初始化JDBC驱动的，SqlSeesion配置主要是针对Mybatis使用事务操作时的配置信息。

									package com.example.demo.config;

									import javax.sql.DataSource;

									import org.apache.ibatis.session.SqlSessionFactory;

									import org.mybatis.spring.SqlSessionFactoryBean;

									import org.mybatis.spring.annotation.MapperScan;

									import org.springframework.boot.autoconfigure.EnableAutoConfiguration;

									import org.springframework.boot.context.properties.ConfigurationProperties;

									import org.springframework.context.annotation.Bean;

									import org.springframework.context.annotation.ComponentScan;

									import org.springframework.core.io.support.PathMatchingResourcePatternResolver;

									import org.springframework.jdbc.datasource.DataSourceTransactionManager;

									import org.springframework.transaction.PlatformTransactionManager;

									@EnableAutoConfiguration

									@ComponentScan

									@MapperScan("com.example.demo.mapper")

									public class JdbcConfig {

									  // DataSource配置

									  @Bean

									  @ConfigurationProperties(prefix = "spring.datasource")

									  public DataSource dataSource() {

									    return new org.apache.tomcat.jdbc.pool.DataSource();

									  }

									  // 提供SqlSeesion(数据库事务操作相关的配置)

									  @Bean

									  public SqlSessionFactory sqlSessionFactoryBean() throws Exception {

									    SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();

									    sqlSessionFactoryBean.setDataSource(dataSource());

									    PathMatchingResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();

									    sqlSessionFactoryBean.setMapperLocations(resolver.getResources("classpath:/mybatis/*.xml"));

									    return sqlSessionFactoryBean.getObject();

									  }

									  @Bean

									  public PlatformTransactionManager transactionManager() {

									    return new DataSourceTransactionManager(dataSource());

									  }

									}

添加Pojo类

该类主要接收数据表中的数据，所以属性基本上跟数据表的属性一致

package com.example.demo.bean;

public class Diary {

  private int id;

  private String title;

  private String content;

  private String pubTime;

  private int userId;

  public int getId() {

    return id;

  }

  public void setId(int id) {

    this.id = id;

  }

  public String getTitle() {

    return title;

  }

  public void setTitle(String title) {

    this.title = title;

  }

  public String getContent() {

    return content;

  }

  public void setContent(String content) {

    this.content = content;

  }

  public String getPubTime() {

    return pubTime;

  }

  public void setPubTime(String pubTime) {

    this.pubTime = pubTime;

  }

  public int getUserId() {

    return userId;

  }

  public void setUserId(int userId) {

    this.userId = userId;

  }

  @Override

  public String toString() {

    return "Diary [id=" + id + ", title=" + title + ", content=" + content + ", pubTime=" + pubTime + ", userId="

        + userId + "]";

  }

}

添加数据表操作接口

该类描述了操作数据表的过程，SprintBoot在运行中会根据类上的@Mapper注解找到它，因此不能落下这个注解

									package com.example.demo.mapper;

									import org.apache.ibatis.annotations.Mapper;

									import org.apache.ibatis.annotations.Param;

									import org.apache.ibatis.annotations.Select;

									import com.example.demo.bean.Diary;

									@Mapper

									public interface DiaryMapper {

									  @Select("select * from diary where _id = #{id}")

									  public Diary getDiaryById(@Param("id")Integer id);

									}

使用

									package com.example.demo.controller;

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

									import org.springframework.web.bind.annotation.RequestMapping;

									import org.springframework.web.bind.annotation.RestController;

									import com.alibaba.fastjson.JSON;

									import com.example.demo.bean.Diary;

									import com.example.demo.mapper.DiaryMapper;

									@RestController

									public class DiaryMappingController {

									  @Autowired

									  DiaryMapper diaryMapper;

									  @RequestMapping("/diary")

									  public String getDiary(Integer id){

									    Diary d = diaryMapper.getDiaryById(id);

									    String json = JSON.toJSONString(d);

									    return json;

									  }

									}