怎么在Springboot中整合Mybatis
怎么在Spring boot中整合Mybatis ?很多新手对此不是很清楚,为了帮助大家解决这个难题,下面小编将为大家详细讲解,有这方面需求的人可以来学习下,希望你能有所收获。
延川ssl适用于网站、小程序/APP、API接口等需要进行数据传输应用场景,ssl证书未来市场广阔!成为创新互联建站的ssl证书销售渠道,可以享受市场价格4-6折优惠!如果有意向欢迎电话联系或者加微信:13518219792(备注:SSL证书合作)期待与您的合作!
步骤:
1.创建一个springboot项目:
2.创建项目的文件结构以及jdk的版本
3.选择项目所需要的依赖
然后点击finish
5.看一下文件的结构:
6.查看一下pom.xml:
4.0.0 com.winter springboot-mybatis-demo 0.0.1-SNAPSHOT jar springboot-mybatis-demo Demo project for Spring Boot org.springframework.boot spring-boot-starter-parent 1.5.6.RELEASE UTF-8 UTF-8 1.7 org.mybatis.spring.boot mybatis-spring-boot-starter 1.3.0 org.springframework.boot spring-boot-starter-thymeleaf org.springframework.boot spring-boot-starter-web org.springframework.boot spring-boot-starter-test test MySQL mysql-connector-java 5.1.35 com.fasterxml.jackson.core jackson-core com.fasterxml.jackson.core jackson-databind com.fasterxml.jackson.datatype jackson-datatype-joda com.fasterxml.jackson.module jackson-module-parameter-names com.github.pagehelper pagehelper-spring-boot-starter 1.1.2 com.alibaba druid-spring-boot-starter 1.1.0 org.springframework.boot spring-boot-maven-plugin org.mybatis.generator mybatis-generator-maven-plugin 1.3.2 ${basedir}/src/main/resources/generator/generatorConfig.xml true true
7.项目不使用application.properties文件 而使用更加简洁的application.yml文件:
将原有的resource文件夹下的application.properties文件删除,创建一个新的application.yml配置文件,
文件的内容如下:
server: port: 8080 spring: datasource: name: test url: jdbc:mysql://127.0.0.1:3306/depot username: root password: root # 使用druid数据源 type: com.alibaba.druid.pool.DruidDataSource driver-class-name: com.mysql.jdbc.Driver filters: stat maxActive: 20 initialSize: 1 maxWait: 60000 minIdle: 1 timeBetweenEvictionRunsMillis: 60000 minEvictableIdleTimeMillis: 300000 validationQuery: select 'x' testWhileIdle: true testOnBorrow: false testOnReturn: false poolPreparedStatements: true maxOpenPreparedStatements: 20 ## 该配置节点为独立的节点,有很多同学容易将这个配置放在spring的节点下,导致配置无法被识别 mybatis: mapper-locations: classpath:mapping/*.xml #注意:一定要对应mapper映射xml文件的所在路径 type-aliases-package: com.winter.model # 注意:对应实体类的路径 #pagehelper分页插件 pagehelper: helperDialect: mysql reasonable: true supportMethodsArguments: true params: count=countSql
8.创建数据库:
CREATE DATABASE mytest; CREATE TABLE t_user( user_id INT NOT NULL PRIMARY KEY AUTO_INCREMENT, user_name VARCHAR(255) NOT NULL , password VARCHAR(255) NOT NULL , phone VARCHAR(255) NOT NULL ) ENGINE=INNODB AUTO_INCREMENT=1000 DEFAULT CHARSET=utf8;
9.使用mybatis generator 自动生成代码:
配置pom.xml中generator 插件所对应的配置文件 ${basedir}/src/main/resources/generator/generatorConfig.xml
点击run-Edit Configurations
添加配置
运行
注意!!!同一张表一定不要运行多次,因为mapper的映射文件中会生成多次的代码,导致报错,切记
最后生成的文件以及结构:
10. 生成的文件
UserMapper.java
package com.winter.mapper; import com.winter.model.User; public interface UserMapper { int deleteByPrimaryKey(Integer userId); int insert(User record); int insertSelective(User record); User selectByPrimaryKey(Integer userId); int updateByPrimaryKeySelective(User record); int updateByPrimaryKey(User record); //这个方式我自己加的 ListselectAllUser(); }
User.java
package com.winter.model; public class User { private Integer userId; private String userName; private String password; private String phone; public Integer getUserId() { return userId; } public void setUserId(Integer userId) { this.userId = userId; } public String getUserName() { return userName; } public void setUserName(String userName) { this.userName = userName == null ? null : userName.trim(); } public String getPassword() { return password; } public void setPassword(String password) { this.password = password == null ? null : password.trim(); } public String getPhone() { return phone; } public void setPhone(String phone) { this.phone = phone == null ? null : phone.trim(); } }
对于sql语句这种黄色的背景,真心是看不下去了(解决方案):
UserMapper.xml
user_id, user_name, password, phone delete from t_user where user_id = #{userId,jdbcType=INTEGER} insert into t_user (user_id, user_name, password, phone) values (#{userId,jdbcType=INTEGER}, #{userName,jdbcType=VARCHAR}, #{password,jdbcType=VARCHAR}, #{phone,jdbcType=VARCHAR}) insert into t_user user_id, user_name, password, phone, #{userId,jdbcType=INTEGER}, #{userName,jdbcType=VARCHAR}, #{password,jdbcType=VARCHAR}, #{phone,jdbcType=VARCHAR}, update t_user where user_id = #{userId,jdbcType=INTEGER} user_name = #{userName,jdbcType=VARCHAR}, password = #{password,jdbcType=VARCHAR}, phone = #{phone,jdbcType=VARCHAR}, update t_user set user_name = #{userName,jdbcType=VARCHAR}, password = #{password,jdbcType=VARCHAR}, phone = #{phone,jdbcType=VARCHAR} where user_id = #{userId,jdbcType=INTEGER}
11.打开类SpringbootMybatisDemoApplication.java,这个是springboot的启动类。我们需要添加点东西:
package com.winter; import org.mybatis.spring.annotation.MapperScan; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; @SpringBootApplication @MapperScan("com.winter.mapper")//将项目中对应的mapper类的路径加进来就可以了 public class SpringbootMybatisDemoApplication { public static void main(String[] args) { SpringApplication.run(SpringbootMybatisDemoApplication.class, args); } }
注意:@MapperScan("com.winter.mapper")
这个注解非常的关键,这个对应了项目中mapper(dao)所对应的包路径,很多同学就是这里忘了加导致异常的
12.到这里所有的搭建工作都完成了,接下来就是测试的工作,没使用junit4进行测试:
首先看一下完成之后的文件的结构:
现在controller,service层的代码都写好:
UserController.java
package com.winter.Controller; import com.winter.model.User; import com.winter.service.UserService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.ResponseBody; /** * Created by Administrator on 2017/8/16. */ @Controller @RequestMapping(value = "/user") public class UserController { @Autowired private UserService userService; @ResponseBody @RequestMapping(value = "/add", produces = {"application/json;charset=UTF-8"}) public int addUser(User user){ return userService.addUser(user); } @ResponseBody @RequestMapping(value = "/all/{pageNum}/{pageSize}", produces = {"application/json;charset=UTF-8"}) public Object findAllUser(@PathVariable("pageNum") int pageNum, @PathVariable("pageSize") int pageSize){ return userService.findAllUser(pageNum,pageSize); } }
UserService.java
package com.winter.service; import com.winter.model.User; import java.util.List; /** * Created by Administrator on 2017/8/16. */ public interface UserService { int addUser(User user); ListfindAllUser(int pageNum, int pageSize); }
UserServiceImpl.java
package com.winter.service.impl; import com.github.pagehelper.PageHelper; import com.winter.mapper.UserMapper; import com.winter.model.User; import com.winter.service.UserService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import java.util.List; /** * Created by Administrator on 2017/8/16. */ @Service(value = "userService") public class UserServiceImpl implements UserService { @Autowired private UserMapper userMapper;//这里会报错,但是并不会影响 @Override public int addUser(User user) { return userMapper.insertSelective(user); } /* * 这个方法中用到了我们开头配置依赖的分页插件pagehelper * 很简单,只需要在service层传入参数,然后将参数传递给一个插件的一个静态方法即可; * pageNum 开始页数 * pageSize 每页显示的数据条数 * */ @Override public ListfindAllUser(int pageNum, int pageSize) { //将参数传给这个方法就可以实现物理分页了,非常简单。 PageHelper.startPage(pageNum, pageSize); return userMapper.selectAllUser(); } }
如果强迫症看不下去那个报错:(解决方法)
测试我使用了idea一个很用心的功能。
可以发http请求的插件:
看完上述内容是否对您有帮助呢?如果还想对相关知识有进一步的了解或阅读更多相关文章,请关注创新互联行业资讯频道,感谢您对创新互联的支持。
网站栏目:怎么在Springboot中整合Mybatis
网页链接:http://myzitong.com/article/pjdsjp.html