SpringBoot+Mybatis 整合 xml配置使用+免xml使用
SpringBoot作为现在非常流行的微服务框架。
Mybatis作为现在非常流行的ORM框架。
他们整合在一起是不是会产生火花呢。
今天就搭建一个SpringBoot+Mybatis的微服务
开发环境：IEDA，JDK1.8
首先我们先创建个maven的工作空间。
左边选中Maven，右边什么都不选>>>>>>>>>>>>Next。
配置好项目信息>>>Next
上图是创建好的项目，我们只是把它作为一个工作空间，把多余的删除，我们先把src目录删了
删除之后，我们正式开始搭建SpringBoot+Mybatis
我们新建一个Module
引用web+mysql+mybatis包>>>>>>>>>>>>Next
Module命名 Next
创建完成之后我们来看看他的pom文件有什么不一样呢
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>4.0.0modelVersion>
<groupId>com.springgroupId>
<artifactId>mybatisartifactId>
<version>0.0.1-SNAPSHOTversion>
<packaging>jarpackaging>
<name>mybatisname>
<description>Demo project for Spring Bootdescription>
<parent>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-parentartifactId>
<version>2.0.2.RELEASEversion>
<relativePath/>
parent>
<properties>
<project.build.sourceEncoding>UTF-8project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8project.reporting.outputEncoding>
<java.version>1.8java.version>
properties>
<dependencies>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-webartifactId>
dependency>
<dependency>
<groupId>org.mybatis.spring.bootgroupId>
<artifactId>mybatis-spring-boot-starterartifactId>
<version>1.3.2version>
dependency>
<dependency>
<groupId>mysqlgroupId>
<artifactId>mysql-connector-javaartifactId>
<scope>runtimescope>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-testartifactId>
<scope>testscope>
dependency>
dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-maven-pluginartifactId>
plugin>
plugins>
build>
project>
其实SpringBoot项目 也就是一个maven项目，你只需要把你需要用到的Jar包引入到pom文件中即可。
我们再把数据库连接配置一下吧打开我们的application.yml
#配置数据源 spring: datasource: url: jdbc:mysql://127.0.0.1:3306/studying username: root password: root driver-class-name: com.mysql.jdbc.Driver #指定mybatis映射文件的地址 mybatis: mapper-locations: classpath:mapper/*.xml server: port: 8099这里数据库我用的是mysql本地数据库，数据库名:studying，账户:root，密码:root,大家可以根据实际情况而定。
mybatis-mapper-locations:配置的是我们映射的xml文件路径，项目启动的时候要扫描该路径下的所有XML完成映射。
server-port这就是服务的访问端口--默认写是8080。
会用到的建表语句
CREATE TABLE `s_user` ( `id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '用户ID', `userName` varchar(255) COLLATE utf8mb4_vietnamese_ci DEFAULT NULL COMMENT '用户名', `password` varchar(255) COLLATE utf8mb4_vietnamese_ci DEFAULT NULL COMMENT '密码', `email` varchar(255) COLLATE utf8mb4_vietnamese_ci DEFAULT NULL COMMENT '邮箱', PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_vietnamese_ci; CREATE TABLE `s_orders` ( `id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '订单ID', `userId` bigint(20) DEFAULT NULL COMMENT '用户ID', `price` double(20,0) DEFAULT NULL COMMENT '价钱', `content` varchar(255) COLLATE utf8mb4_vietnamese_ci DEFAULT NULL COMMENT '内容', PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_vietnamese_ci;
我们现在resources新建一个mapper路径
放置我们的xml文件
建好项目该有的model-service-dao-controller包（虽然是小demo，麻雀虽小，五脏俱全）
这里呢做两个案例，一个是合起xml使用，sql和java代码分离。一个是免xml使用。
我们建一个User类
package com.spring.mybatis.model; /** * @ClassName User * @Description TODO * @Author Tiny * @Date 2018/6/5 * @Version 1.0 */ public class User { private Long id; private String userName; private String password; private String email; 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; } public String getEmail() { return email; } public void setEmail(String email) { this.email = email; } @Override public String toString() { return "User{" + "id=" + id + ", userName='" + userName + '\'' + ", password='" + password + '\'' + ", email='" + email + '\'' + '}'; } }
我们就做一个添删改查的例子，项目中常见的
写一个接口实现数据的添删改查
package com.spring.mybatis.model; /** * @ClassName User * @Description TODO * @Author Tiny * @Date 2018/6/5 * @Version 1.0 */ public class User { private Long id; private String userName; private String password; private String email; 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; } public String getEmail() { return email; } public void setEmail(String email) { this.email = email; } @Override public String toString() { return "User{" + "id=" + id + ", userName='" + userName + '\'' + ", password='" + password + '\'' + ", email='" + email + '\'' + '}'; } }
然后再mapper下建立一个UserMapper.xml
实现接口类的数据操作
xml version="1.0" encoding="UTF-8" ?>
mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.spring.mybatis.dao.UserDao">
<select id="findByUserName" parameterType="String" resultType="com.spring.mybatis.model.User">
select id,userName,password,email from s_user where userName = #{userName}
select>
<insert id="insertUser" parameterType="com.spring.mybatis.model.User" useGeneratedKeys="true" keyProperty="id">
insert into s_user(userName, password,email) VALUES(#{userName}, #{password},#{email})
insert>
<delete id="deleteUserById" parameterType="Long">
delete from s_user where id = #{id}
delete>
<update id="updatePassword" parameterType="com.spring.mybatis.model.User">
update s_user set password = #{password} where userName = #{userName}
update>
mapper>
写好我们该有的Service层
package com.spring.mybatis.service; import com.spring.mybatis.model.User; /** * @ClassName UserService * @Description TODO * @Author Tiny * @Date 2018/6/5 * @Version 1.0 */ public interface UserService { User findByUserName(String userName); void insertUser(User user); void deleteUserById(Long id); void updatePassword(User user); }再实现它的接口
package com.spring.mybatis.service.impl; import com.spring.mybatis.dao.UserDao; import com.spring.mybatis.model.User; import com.spring.mybatis.service.UserService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; /** * @ClassName UserServiceImpl * @Description TODO * @Author Tiny * @Date 2018/6/5 * @Version 1.0 */ @Service public class UserServiceImpl implements UserService { @Autowired private UserDao userDao; @Override public User findByUserName(String userName) { return userDao.findByUserName(userName); } @Override public void insertUser(User user) { userDao.insertUser(user); } @Override public void deleteUserById(Long id) { userDao.deleteUserById(id); } @Override public void updatePassword(User user) { userDao.updatePassword(user); } }写个Controller来测试一下吧
package com.spring.mybatis.controller; import com.spring.mybatis.model.User; import com.spring.mybatis.service.impl.UserServiceImpl; import org.apache.ibatis.annotations.Param; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.ResponseBody; import org.springframework.web.bind.annotation.RestController; import java.util.HashMap; import java.util.Map; /** * @ClassName UserController * @Description TODO * @Author Tiny * @Date 2018/6/5 * @Version 1.0 */ @RestController @RequestMapping(value = "/user") public class UserController { @Autowired private UserServiceImpl userService; /** * 添加一个用户 * @param userName * @param password * @param email * @return */ @GetMapping(value = "/inserUser") @ResponseBody public Object inserUser(@Param("userName") String userName,@Param("password") String password,@Param("email") String email){ Map<String,Object> data = new HashMap<>(); User user = new User(); user.setUserName(userName); user.setPassword(password); user.setEmail(email); userService.insertUser(user); data.put("code","0"); data.put("message","添加成功！"); return data; } /** * 根据用户名查询用户 * @param userName * @return */ @GetMapping(value = "/findByUserName") @ResponseBody public Object findByUserName(@Param("userName")String userName){ Map<String,Object> data = new HashMap<>(); User user = userService.findByUserName(userName); if (null != user) { data.put("user",user); data.put("code","0"); data.put("message","查询成功！"); } else { data.put("code","0"); data.put("message","没有找到用户！"); } return data; } /** * 根据Id删除用户 * @param id * @return */ @GetMapping(value = "/deleteUserById") @ResponseBody public Object deleteUserById(@Param("id")Long id){ Map<String,Object> data = new HashMap<>(); userService.deleteUserById(id); data.put("code","0"); data.put("message","删除成功！"); return data; } /** * 根据用户名更新密码 * @param password * @param userName * @return */ @GetMapping(value = "/updatePassword") @ResponseBody public Object updatePassword(@Param("password")String password,@Param("userName")String userName){ Map<String,Object> data = new HashMap<>(); User user = userService.findByUserName(userName); if (null != user) { user.setPassword(password); userService.updatePassword(user); data.put("user",user); data.put("code","0"); data.put("message","修改成功！"); } else { data.put("code","0"); data.put("message","没有找到用户！"); } return data; } }
后面的我就不一一演示了。大家只要知道其中的原理就行啦。
我们再写一个免XMl配置的Orders（ps---Order是特殊字段，所以加个s）
package com.spring.mybatis.model; /** * @ClassName Orders * @Description TODO * @Author Tiny * @Date 2018/6/5 * @Version 1.0 */ public class Orders { private Long id; private Long userId; private Double price; private String content; public Long getId() { return id; } public void setId(Long id) { this.id = id; } public Long getUserId() { return userId; } public void setUserId(Long userId) { this.userId = userId; } public Double getPrice() { return price; } public void setPrice(Double price) { this.price = price; } public String getContent() { return content; } public void setContent(String content) { this.content = content; } @Override public String toString() { return "Orders{" + "id=" + id + ", userId=" + userId + ", price=" + price + ", content='" + content + '\'' + '}'; } }
dao层直接写SQL
package com.spring.mybatis.dao; import com.spring.mybatis.model.Orders; import org.apache.ibatis.annotations.*; /** * 直接在Java里面写Sql */ @Mapper public interface OrdersDao { @Select("select id, userId, price, content from s_orders where userId = #{userId}") Orders findOrdersByUserId(@Param("userId") Long userId); @Insert("insert into s_orders(userId, price, content) values (#{userId}, #{price}, #{content})") int insertOrders(@Param("userId") Long userId, @Param("price") Double price, @Param("content") String content); @Delete("delete from s_orders where id = #{id}") int deleteOrders(@Param("id") Long id); @Update("update s_orders set content = #{content} where userId = #{userId}") int updateOrders(@Param("content") String content, @Param("userId")Long userId); }不得不说Spring的注解功能非常强大
package com.spring.mybatis.service; import com.spring.mybatis.model.Orders; public interface OrdersService { Orders findOrdersByUserId(Long userId); void insertOrders(Long userId, Double price, String content); int deleteOrders(Long id); int updateOrders(String content, Long userId); }
package com.spring.mybatis.service.impl; import com.spring.mybatis.dao.OrdersDao; import com.spring.mybatis.model.Orders; import com.spring.mybatis.service.OrdersService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import org.springframework.transaction.annotation.Transactional; /** * @ClassName OrdersServiceImpl * @Description TODO * @Author Tiny * @Date 2018/6/5 * @Version 1.0 */ @Service public class OrdersServiceImpl implements OrdersService { @Autowired private OrdersDao ordersDao; @Override public Orders findOrdersByUserId(Long userId) { return ordersDao.findOrdersByUserId(userId); } /** * 添加事物管理--报错--代码回滚 * @param userId * @param price * @param content * @return */ @Override @Transactional public void insertOrders(Long userId, Double price, String content) { ordersDao.insertOrders(userId, price, content); // int max = 2/0; //正常情况下，代码执行到这报错，但是已经走了inserOrders方法。加上事物管理，他会把inserOrders方法回滚，你把注释放开看看 } @Override public int deleteOrders(Long id) { return ordersDao.deleteOrders(id); } @Override public int updateOrders(String content, Long userId) { return ordersDao.updateOrders(content, userId); } }
package com.spring.mybatis.controller; import com.spring.mybatis.model.Orders; import com.spring.mybatis.model.User; import com.spring.mybatis.service.impl.OrdersServiceImpl; import com.spring.mybatis.service.impl.UserServiceImpl; import org.apache.ibatis.annotations.Param; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.ResponseBody; import org.springframework.web.bind.annotation.RestController; import java.util.HashMap; import java.util.Map; /** * @ClassName OrdersController * @Description TODO * @Author Tiny * @Date 2018/6/5 * @Version 1.0 */ @RestController @RequestMapping(value = "/order") public class OrdersController { @Autowired private UserServiceImpl userService; @Autowired private OrdersServiceImpl ordersService; /** *查询用户下的订单 * @param userName 传一个userName--@Param-课直接接收前端传递过来的值，取代传统的request.getParameter(); * @return */ @GetMapping(value = "/findOrdersByUserName") @ResponseBody public Object findOrdersByUserName(@Param("userName") String userName){ Map<String,Object> data = new HashMap<>(); User user = userService.findByUserName(userName); if (null != user) { Orders order = ordersService.findOrdersByUserId(user.getId()); if (null != order) { data.put("order", order); data.put("user", user); data.put("code", "0"); data.put("message", "操作成功！"); } else { data.put("user", user); data.put("code", "0"); data.put("message", "该用户下没有订单！"); } } else { data.put("code", "1"); data.put("message", "用户不存在！"); } return data; } /** * 给用户插入一条订单 * @param userName * @param price * @param content * @return */ @GetMapping(value = "/insertOrders") @ResponseBody public Object insertOrders(@Param("userName") String userName,@Param("price") Double price,@Param("content") String content){ Map<String,Object> data = new HashMap<>(); User user = userService.findByUserName(userName); if (null != user) { ordersService.insertOrders(user.getId(), price, content); data.put("message", "添加成功"); data.put("code", "0"); } else { data.put("code", "1"); data.put("message", "用户不存在！"); } return data; } /** * 删除订单 * @param orderId * @return */ @GetMapping(value = "/deleteOrders") @ResponseBody public Object deleteOrders(@Param("id") Long orderId){ Map<String,Object> data = new HashMap<>(); int count = ordersService.deleteOrders(orderId); data.put("count",count); return data; } /** * 更新订单数据 * @param userName * @param content * @return */ @GetMapping(value = "/updateOrders") @ResponseBody public Object updateOrders(@Param("userName")String userName, @Param("content") String content){ Map<String,Object> data = new HashMap<>(); User user = userService.findByUserName(userName); if (null != user) { int count = ordersService.updateOrders(content, user.getId()); if (count > 0) { data.put("message", "修改成功"); data.put("code", "0"); }else { data.put("message", "修改失败"); data.put("code", "1"); } } else { data.put("code", "1"); data.put("message", "用户不存在！"); } return data; } }我们把两块的业务整合到一起去，看看
注释我都写代码里了
源码目前就不分享了，如果真的想要去深入了解，还是自己码一遍比较好。
后期再发一个JPA的案例，哈哈。
哪里不对的地方，请大家多多指正。