springBoot整合mybatis
springBoot跟IBatis是啥我们也不介绍了,闲话不多说,主要看代码,
1.搭建基本环境,创建一个maven工程,导入springBoot依赖的pom文件,
4.0.0
com.didispace
Chapter1
1.0.0
jar
spring-boot
The first Spring Boot project
org.springframework.boot
spring-boot-starter-parent
1.3.2.RELEASE
UTF-8
1.8
org.springframework.boot
spring-boot-starter
org.springframework.boot
spring-boot-starter-test
test
org.springframework.boot
spring-boot-starter-web
org.springframework.boot
spring-boot-starter-freemarker
org.springframework.boot
spring-boot-maven-plugin
2 .测试代码,看看能不能运行起来,在基包创建一个springBoot执行器
package cn.csdn;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class SpringBootThymeleafApp {
public static void main(String[] args) {
SpringApplication.run(SpringBootThymeleafApp.class, args);
}
}
3 .创建一个controller,需要注意的是,controller一定要在基包下,
package cn.csdn.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
@Controller
public class UserController {
@RequestMapping("hello")
@ResponseBody
public String sayHello(){
return "你好,程序猿";
}
}
4 .运行执行器,页面测试,这里会有个坑,就是如果提前导入了myBatis需要的依赖就会报出
Spring Boot - Cannot determine embedded database driver class for database type NONE
5.执行到这里,环境已经基本算是ok的了,我们开始整合iBatis,导入iBatis所需要的依赖,以及数据库驱动
org.mybatis.spring.boot
mybatis-spring-boot-starter
1.1.1
mysql
mysql-connector-java
5.1.6
5.有俩种方案,一种是注解,一种是xml配置,注解是前期开发简单配置,但是后期开发就会显得有点无力了,
而且myBatis的优点就是动态sql,所以个人还是比较推荐使用xml配置的,
建表
CREATE TABLE User(
uId INT PRIMARY KEY AUTO_INCREMENT,
uName VARCHAR(32),
uAge INT
);插入数据
INSERT INTO UserVALUES (NULL,'李白',16);INSERT INTO
UserVALUES (NULL,'杜甫',17);INSERT INTO
UserVALUES (NULL,'曹操',21);INSERT INTO
UserVALUES (NULL,'刘备',25);INSERT INTO
UserVALUES (NULL,'孙权',30);
创建pojo类(javaBean),
public class User {
private Integer uId;
private String uName;
private Integer uAge;
//要有set get 方法..
}
6.注解整合myBatis,
1.创建一个mapper接口,
package cn.csdn.dao;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;@Repository@Mapperpublic interface IUserDao { @Select("select * from User where uId = #{id}") public User selectById(Integer id);}
2.创建service接口
package cn.csdn.service;
public interface IUserService {
User findById(Integer id);
}
3.创建service实现类
package cn.csdn.service;
import cn.csdn.dao.IUserDao;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
@Service
public class UserServiceImpl implements IUserService {
@Autowired
private IUserDao iUserDao;
@Override
public User findById(Integer id) {
return iUserDao.selectById(id);
}
}
3.编写controller
@RequestMapping("test/{id}")@ResponseBody
public User test(@PathVariable Integer id){
return userService.findById(id);
}
最后写完代码还要在resoures目录下增加配置文件application.properties
spring.datasource.driverClassName = com.mysql.jdbc.Driver
spring.datasource.url = jdbc:mysql://localhost:3306/mybatis?useUnicode=true&characterEncoding=utf-8
spring.datasource.username = root
spring.datasource.password = 1039191520最后在执行类里面添加注解,
@MapperScan("cn.csdn.dao")
运行main方法,
测试结果如下
7.mapper通用方式
1.pom文件添加依赖
com.github.abel533 mapper 2.3.4 com.github.abel533 mapper 2.3.4
2.在application.properties文件添加配置文件
# 别名扫描pojo,
mybatis.type-aliases-package=cn.csdn.pojo
# myBatis 配置文件的位置
mybatis.config-locations=classpath:SqlMapConfig.xml
#mapper xml的位置
mybatis.mapper-locations=classpath:mybatis/*Mapper.xml
在 resources 创建SqlMapConfig.xml 文件
3.编写mapper接口
package cn.csdn.dao;
import cn.csdn.pojo.User;
import org.apache.ibatis.annotations.Mapper;
@Mapper
public interface UserMapper {
User selectById(Integer id);
}4.编写service层代码
@Autowired
private UserMapper mapper;
public User findById2(Integer id){
return mapper.selectById(id);
}
5.controller编写
@RequestMapping("test2/{id}")
@ResponseBody
public User test2(@PathVariable Integer id){
return userService.findById2(id);
}
6.在resources 目录下创建mapper 文件夹,在文件夹里创建UserMapper.xml文件,请注意mapper的规范,这里就不提了
7.代码测试结果如下
