内容简介:说明:写了通用的增删改查以及部分批量操作。具体请看mybatis官方文档。
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操作系统:Mac OS X 10.13.2
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编辑器:IntelliJ IDEA 2017
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JDK版本:jdk 1.8
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Maven版本:apache-maven-3.5.0
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SpringBoot版本:SpringBoot 2.0
二、pom依赖文件
<?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> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.1.3.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.lonelycountry</groupId> <artifactId>springboot-mybatis</artifactId> <version>0.0.1-SNAPSHOT</version> <name>springboot-mybatis</name> <description>Demo project for Spring Boot</description> <properties> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>2.0.0</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <scope>runtime</scope> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-configuration-processor</artifactId> <optional>true</optional> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <optional>true</optional> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <!-- 分页插件 --> <dependency> <groupId>com.github.pagehelper</groupId> <artifactId>pagehelper-spring-boot-starter</artifactId> <version>1.2.5</version> </dependency> <!-- alibaba的druid数据库连接池 --> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid-spring-boot-starter</artifactId> <version>1.1.9</version> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> <!--这个自动生成 工具 我觉得不好用啊--> <!--<plugin>--> <!--<groupId>org.mybatis.generator</groupId>--> <!--<artifactId>mybatis-generator-maven-plugin</artifactId>--> <!--<version>1.3.2</version>--> <!--<configuration>--> <!--<configurationFile>${basedir}/src/main/resources/generator/generatorConfig.xml</configurationFile>--> <!--<overwrite>true</overwrite>--> <!--<verbose>true</verbose>--> <!--</configuration>--> <!--</plugin>--> </plugins> </build> </project> 复制代码
三、配置文件以及工程结构
1、配置文件
application.yml
spring: datasource: name: springboot-demo type: com.alibaba.druid.pool.DruidDataSource druid: filters: stat driver-class-name: com.mysql.cj.jdbc.Driver username: root password: ****** url: jdbc:mysql://localhost:3306/springboot-mybatis initial-size: 1 min-idle: 1 max-active: 20 max-wait: 60000 time-between-eviction-runs-millis: 60000 min-evictable-idle-time-millis: 300000 validation-query: SELECT 'x' test-while-idle: true test-on-borrow: false test-on-return: false pool-prepared-statements: false max-pool-prepared-statement-per-connection-size: 20 http: encoding: charset: UTF-8 server: port: 80 tomcat: uri-encoding: utf-8 mybatis: mapper-locations: classpath:mapping/*.xml type-aliases-package: com.lonelycountry.springbootmybatis.po configuration: map-underscore-to-camel-case: true pagehelper: helper-dialect: mysql reasonable: true support-methods-arguments: true params: count=countSql 复制代码
2、目录结构
四、编写代码
1、构建Po层以及数据库表
(1)、User类
package com.lonelycountry.springbootmybatis.po; import lombok.AllArgsConstructor; import lombok.Getter; import lombok.NoArgsConstructor; import lombok.Setter; import lombok.ToString; import org.apache.ibatis.type.Alias; import java.sql.Timestamp; @Alias("User")//设置别名,在mapper.xml里面就不需要每次都填完整路径了 @ToString @Setter @Getter @NoArgsConstructor @AllArgsConstructor public class User { private Long id; private String username; private String password; private Integer age; private Timestamp createDate; } 复制代码
(2)、User表
2、构建Dao层
package com.lonelycountry.springbootmybatis.dao; import com.lonelycountry.springbootmybatis.po.User; import org.apache.ibatis.annotations.Param; import org.springframework.stereotype.Repository; import java.util.List; @Repository public interface UserMapper { List<User> listUsers(); List<User> listUsers(@Param("pageNum") int pageNum, @Param("pageSize") int pageSize); User getUser(@Param("id") Long id); void insertUser(User user); void updateUser(User user); void batchInsertUser(@Param("users") List<User> users); void deleteUser(@Param("id") Long id); void batchDeleteUser(@Param("ids") List<Long> ids); } 复制代码
<?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.lonelycountry.springbootmybatis.dao.UserMapper"> <select id="listUsers" resultType="User"> select * from user </select> <select id="getUser" resultType="User"> select * from user <where> <if test="id != null"> id = #{id} </if> </where> </select> <insert id="insertUser"> insert into user (id,username,password,age,create_date) values (#{id},#{username},#{password},#{age},#{createDate}) </insert> <insert id="batchInsertUser"> insert into user (id,username,password,age,create_date) values <foreach collection="users" item="user" index="index" separator=","> (#{user.id},#{user.username},#{user.password},#{user.age},#{user.createDate}) </foreach> </insert> <update id="updateUser"> update user <set> username = #{username}, password = #{password}, age = #{age}, create_date = #{createDate} </set> <where> id = #{id} </where> </update> <delete id="deleteUser"> delete from user <where> <if test="id != null"> id = #{id} </if> </where> </delete> <delete id="batchDeleteUser"> delete from user <where> id in <foreach collection="ids" item="id" index="index" separator="," open="(" close=")"> <if test="id != null"> #{id} </if> </foreach> </where> </delete> </mapper> 复制代码
说明:
写了通用的增删改查以及部分批量操作。具体请看mybatis官方文档。
3、构建controller层
UserController
package com.lonelycountry.springbootmybatis.controller; import com.github.pagehelper.Page; import com.github.pagehelper.PageHelper; import com.github.pagehelper.PageInfo; import com.lonelycountry.springbootmybatis.dao.UserMapper; import com.lonelycountry.springbootmybatis.po.User; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.PostMapping; import org.springframework.web.bind.annotation.RequestBody; import org.springframework.web.bind.annotation.RestController; import javax.servlet.http.HttpServletRequest; import java.sql.Timestamp; import java.util.List; /** * @author zhuqiwei * 2019-02-19. */ @RestController public class UserController { @Autowired UserMapper userMapper; @Autowired private HttpServletRequest request; @GetMapping("/user/all") public List<User> getUser() { List<User> users = userMapper.listUsers(); return users; } @GetMapping("/user/{id}") public User getUser(@PathVariable Long id) { User user = userMapper.getUser(id); return user; } @PostMapping("/user/create") public User insertUser(@RequestBody User user) { Timestamp timestamp = new Timestamp(System.currentTimeMillis()); user.setCreateDate(timestamp); userMapper.insertUser(user); return user; } @PostMapping("/user/update") public User updateUser(@RequestBody User user) { Timestamp timestamp = new Timestamp(System.currentTimeMillis()); user.setCreateDate(timestamp); userMapper.updateUser(user); return user; } @PostMapping("/user/create/batch") public List<User> insertUser(@RequestBody List<User> users) { Timestamp timestamp = new Timestamp(System.currentTimeMillis()); users.forEach(user -> { user.setCreateDate(timestamp); }); userMapper.batchInsertUser(users); return users; } @PostMapping("/user/delete/{id}") public List<User> deleteUser(@PathVariable("id") Long id) { userMapper.deleteUser(id); return getUser(); } @PostMapping("/user/delete/batch") public List<User> updateUser(@RequestBody List<Long> ids) { userMapper.batchDeleteUser(ids); return getUser(); } @GetMapping("/user/all/{page}/{size}") public PageInfo<User> getUser(@PathVariable("page") int page, @PathVariable("size") int size) { //方法1 //List<User> users = PageHelper.startPage(page, size).doSelectPage(() -> userMapper.listUsers()); //return users; //方法2 //PageHelper.startPage(page, size); //List<User> users = userMapper.listUsers(); //Page<User> userPage = (Page<User>) users; //return userPage; //方法4 PageHelper.startPage(page, size); List<User> users = userMapper.listUsers(); PageInfo<User> pageInfo = new PageInfo<>(users); return pageInfo; //return null; } @GetMapping("/user/all/flip") public List<User> getUser2() { //方法3 PageHelper.startPage(request); List<User> users = userMapper.listUsers(); Page<User> userPage = (Page<User>) users; return userPage; } } 复制代码
说明:
在获取全部user数据的时候使用了分页插件并实现了四种方法,具体相关文档可以参照 mybatis分页插件官方文档 。
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