Spring Boot+Mybatis的整合过程

这篇文章主要介绍了Spring Boot+Mybatis的整合过程,需要的朋友可以参考下

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

  org.mybatis.spring.bootmybatis-spring-boot-starter1.1.1

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)

  org.apache.tomcattomcat-jdbc mysqlmysql-connector-java5.1.21 com.alibabafastjson1.1.43

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：

这里写图片描述

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

这里写图片描述

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; } }

最后运行SpringBoot项目，然后在浏览器上输入网址：

http://localhost:8080/diary?id=2

这样即可看到结果

这里写图片描述