SpringBoot+Maven项目实战（4）：集成Mybatis

1.构建测试数据库（Mysql）

CREATE TABLE `message` (
`ID` int(50) NOT NULL AUTO_INCREMENT COMMENT 'ID',
`NICK_NAME` varchar(50) DEFAULT NULL COMMENT '昵称',
`IP` varchar(50) DEFAULT NULL COMMENT 'IP',
`INSERT_TIME` datetime DEFAULT NULL COMMENT '提交时间',
PRIMARY KEY (`ID`)
) ENGINE=InnoDB AUTO_INCREMENT=51 DEFAULT CHARSET=utf8;

插一下： 是否有小伙伴经常遇到过这种情况：主键为自增，我开发期间插入了100条测试数据，开发完成后，直接通过工具导出mysql表，然后导入的生产线上的数据库中，当插入数据时，主键并不是从预想的0开始增加。曾经我就被这整懵逼过，后来下决心仔细看了看建表语句才发现了一些端倪。仔细看上面的建表语句，主键是自增的，并且在语句最后有这么一句：ENGINE=InnoDB AUTO_INCREMENT=51 DEFAULT CHARSET=utf8;这句的意思依次是：使用InnoDB 引擎，自增键的起始序号为51，默认编码为UTF-8。看到了吧？就是这个东西AUTO_INCREMENT。你建表的时候改成0哈，否则你懵逼了别怨我。

另附一个批量插入的存储过程

DELIMITER ;;
CREATE DEFINER=`root`@`localhost` PROCEDURE `autoInsert`()
BEGIN
DECLARE
i INT DEFAULT 0 ; -- 开始
SET autocommit = 0 ; -- 结束
WHILE (i < 1000) DO
REPLACE INTO message (
`ID`,
`NICK_NAME`,
`IP`,
`INSERT_TIME`
)
VALUE
(
i,
'zhangyd',
'127.0.0.1',
NOW()
) ;
SET i = i + 1 ;
END
WHILE ;
SET autocommit = 1 ; COMMIT ;
END
;;
DELIMITER ;

调用：

call autoInsert

2.pom.xml配置

<?xml version="1.0" encoding="UTF-8"?>
<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.blog</groupId>
<artifactId>blog</artifactId>
<version>1.0-SNAPSHOT</version>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.4.0.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.7</java.version>
</properties>
<dependencies>
<!--支持 Web 应用开发，包含 Tomcat 和 spring-mvc。 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<!--模板引擎-->
<!--  <dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-freemarker</artifactId>
</dependency>
<!--springboot 集成Mybatis所需jar配置 start-->
<!--支持使用 JDBC 访问数据库-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<!--Mybatis-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.2.2</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.2.8</version>
</dependency>
<!--Mysql / DataSource-->
<dependency>
<groupId>org.apache.tomcat</groupId>
<artifactId>tomcat-jdbc</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<!--springboot 集成Mybatis所需jar配置 end-->
<!--Json Support-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.1.43</version>
</dependency>
<!--springboot中修改完文件后自动reload的插件，修改完文件Ctrl + F9 Make一下就可以-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>springloaded</artifactId>
<version>1.2.3.RELEASE</version>
</dependency>
<!--springboot中修改完文件后自动reload的插件 end-->
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>springloaded</artifactId>
<version>1.2.3.RELEASE</version>
</dependency>
</dependencies>
</plugin>
</plugins>
</build>
<!--配置远程仓库地址-->
<repositories>
<repository>
<id>spring-milestone</id>
<url>https://repo.spring.io/libs-release</url>
</repository>
</repositories>
<!--配置远程仓库地址-->
<pluginRepositories>
<pluginRepository>
<id>spring-milestone</id>
<url>https://repo.spring.io/libs-release</url>
</pluginRepository>
</pluginRepositories>
</project>

3.application.properties文件配置

spring.datasource.url=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8&zeroDateTimeBehavior=convertToNull&allowMultiQueries=true
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

4.程序主函数(Applaction.java)

package com.blog;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.tomcat.jdbc.pool.DataSource;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.annotation.MapperScan;
import org.mybatis.spring.mapper.MapperScannerConfigurer;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
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;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
/**
* blog
* Created by yadong.zhang on com.blog.application
* User：yadong.zhang
* Date：2016/10/20
* Time：18:15
*/
/**
* 1).@SpringBootApplication标注启动配置入口，run()方法会创建一个Spring应用上下文(Application Context)。
* SpringBoot通过启动内嵌的Servlet容器（默认tomcat）用来处理Http请求。
* 2).@RestController是特殊的Controller，他的返回值直接作为Http Response的Body部分返回给浏览器
* 3).Spring WebMvc框架会将Servlet容器里收到的Http请求根据路径分发到对应的@Controller下进行处理。
*/
@EnableAutoConfiguration
@SpringBootApplication
@ComponentScan
//指定扫描的mapper接口所在的包
@MapperScan("com.blog.mapper")
//启动注解事务管理
@EnableTransactionManagement
//@RestController
public class Applaction {

private static final String TYPE_ALIASES_PACKAGE = "com.blog.model";
private static final String MAPPER_LOCATION = "classpath:/mybatis/*.xml";
@Bean
@Autowired
public SqlSessionFactory sqlSessionFactory(DataSource dataSource) throws Exception {
final SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
sqlSessionFactoryBean.setDataSource(dataSource);
//mybatis.typeAliasesPackage：指定domain类的基包，即指定其在*Mapper.xml文件中可以使用简名来代替全类名（看后边的UserMapper.xml介绍）
sqlSessionFactoryBean.setTypeAliasesPackage(TYPE_ALIASES_PACKAGE);
/*
mybatis.mapperLocations：指定*Mapper.xml的位置
如果不加会报org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.blog.mapper.MessageMapper.findMessageInfo异常
因为找不到*Mapper.xml，也就无法映射mapper中的接口方法。
*/
sqlSessionFactoryBean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources(MAPPER_LOCATION));
return sqlSessionFactoryBean.getObject();
}
public static void main(String[] args) {
SpringApplication.run(Applaction.class, args);
}
}

*注：

sqlSessionFactoryBean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources(MAPPER_LOCATION));这一句话一定要有，就是指定程序去哪儿查找Mapper.xml文件*

5.Mapper.java、Mapper.xml

package com.blog.mapper;
import com.blog.model.Message;
import org.springframework.stereotype.Repository;
import java.util.List;
/**
* blog
* Created by yadong.zhang on com.blog.mapper
* User：yadong.zhang
* Date：2016/10/21
* Time：11:19
*/
@Repository
public interface MessageMapper{
public List<Message> findMessageInfo();
}

<?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.blog.mapper.MessageMapper">
<resultMap id="message_map" type="com.blog.model.Message">
<id property="id" column="ID" jdbcType="INTEGER"></id>
<result property="ip" column="IP" jdbcType="VARCHAR"></result>
<result property="insertDate" column="INSERT_TIME" jdbcType="DATE"></result>
<result property="nickName" column="NICK_NAME" jdbcType="VARCHAR"></result>
</resultMap>
<select id="findMessageInfo" resultMap="message_map">
select * from message
</select>
</mapper>

6.Controller(中间还有Service层以及其实现，此处略)

package com.blog.controller;
import com.blog.service.IMessageService;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import javax.annotation.Resource;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
/**
* blog
* Created by yadong.zhang on com.blog.controller
* User：yadong.zhang
* Date：2016/10/20
* Time：18:26
*/
@Controller
public class HelloController {
@Resource
private IMessageService messageService;
@RequestMapping("/message")
public String message(Model model){
model.addAttribute("messages", messageService.findMessageInfo());
return "message";
}
}

7.测试视图结果