接上文:SpringBoot整合Mybatis【注解版】
一、项目创建
- 新建一个工程
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- 选择Spring Initializr,配置JDK版本
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- 输入项目名
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- 选择构建web项目所需的staters(启动器)
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- 选择与数据库相关的组件
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分析:Spring Boot基本上将我们实际项目开发中所遇到的所有场景都做了封装。它将所有的功能场景都抽取出来,做成了一个个的staters(启动器),只需要在项目的pom.xml配置文件里面引入这些starter相关场景的所有依赖都会导入进来。需要什么功能就导入什么场景的启动器,实质就是通过配置导入了与实现其功能相关的jar包,然后直接进行项开发即可。
- 选择保存地址后点击Finish
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- 注意:idea必须在联网环境下才会自动构建项目
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- 在项目中使用druid作为数据源,不会的请点击SpringBoot整合Druid数据源
- 在bean包下新建实体类对象Employee(员工)
package com.cyn.bean; /** * @author:cyn * @create:2018/12/30 16:14 * @description:员工实体类 */ public class Employee { private Integer id; private String lastName; private Integer gender; private String email; private Integer dId; public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getLastName() { return lastName; } public void setLastName(String lastName) { this.lastName = lastName; } public Integer getGender() { return gender; } public void setGender(Integer gender) { this.gender = gender; } public String getEmail() { return email; } public void setEmail(String email) { this.email = email; } public Integer getdId() { return dId; } public void setdId(Integer dId) { this.dId = dId; } }
- 新建数据库mybatis,在数据库中新建与实体类对象相关联的数据库表 employee
DROP TABLE IF EXISTS `employee`; CREATE TABLE `employee` ( `id` int(11) NOT NULL AUTO_INCREMENT, `lastName` varchar(255) DEFAULT NULL, `email` varchar(255) DEFAULT NULL, `gender` int(2) DEFAULT NULL, `d_id` int(11) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;
- 在mapper包下新建与实体类所关联的mapper接口【非注解版】:EmployeeMapper
package com.cyn.mapper; import com.cyn.bean.Employee; /** * @author:崔雅楠 * @create:2018/12/30 17:32 * @description:员工管理 */ //在这里使用@Mapper注解或在主类中使用@MapperScan注解将该接口扫描装配到容器中 @Mapper public interface EmployeeMapper { //查询 public Employee getEmpById(Integer id); //插入 public void insertEmp(Employee employee); }
- 在classpath:mybatis/下新建mybatis的主配置文件:mybatis-config.xml
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd"> <configuration> <settings> <!--开启驼峰命名规则--> <setting name="mapUnderscoreToCamelCase" value="true"/> </settings> </configuration>
- 在classpath:mybatis/mapper/下新建mapper接口相对应的映射文件例如:EmployeeMapper.xml
<?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"> <!--切记:要将此映射文件与相对应的mapper接口通过namespace属性进行关联--> <mapper namespace="com.cyn.mapper.EmployeeMapper"> <!-- public Employee getEmpById(Integer id); public void insertEmp(Employee employee);--> <select id="getEmpById" resultType="com.cyn.bean.Employee"> SELECT * FROM employee WHERE id=#{id} </select> <insert id="insertEmp"> INSERT INTO employee(lastName,email,gender,d_id) VALUES (#{lastName},#{email},#{gender},#{dId}) </insert> </mapper>
- 在application.yml(application.properties)项目配置文件中指定mybatis的主配置文件和mapper映射文件的路径,告知springboot,完整application.yml配置文件如下:
spring: datasource: username: root password: 123456 url: jdbc:mysql://localhost:3306/mybatis driver-class-name: com.mysql.jdbc.Driver #修改springboot默认数据源为Druid type: com.alibaba.druid.pool.DruidDataSourceC3P0Adapter #数据源其他配置 initialSize: 5 minIdle: 5 maxActive: 20 maxWait: 60000 timeBetweenEvictionRunsMillis: 60000 minEvictableIdleTimeMillis: 300000 validationQuery: SELECT 1 FROM DUAL testWhileIdle: true testOnBorrow: false testOnReturn: false poolPreparedStatements: true #配置监控统计拦截的filters,去掉后监控界面sql无法统计,‘wall‘用于防火墙 filters: stat,wall,log4j maxPoolPreparedStatementPerConnectionSize: 20 useGlobalDataSourceStat: true connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500 #配置mybatis的主配置文件和mapper映射文件的路径 mybatis: config-location: classpath:mybatis/mybatis-config.xml mapper-locations: classpath:mybatis/mapper/*.xml
- 在controller包下新建controller控制类:EmpController
package com.cyn.controller; import com.cyn.bean.Employee; import com.cyn.mapper.EmployeeMapper; 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.RestController; /** * @author:cyn * @create:2019/1/1 20:15 * @description:员工管理 */ @RestController public class EmpController { @Autowired EmployeeMapper employeeMapper; //查询 @GetMapping("emp/{id}") public Employee getEmpById(@PathVariable("id") Integer id){ return employeeMapper.getEmpById(id); } //添加 @GetMapping("emp") public void insertEmp(Employee employee){ employeeMapper.insertEmp(employee); } }附录:
- @RestController:等价于同时使用@ResponseBody和@Controller
- @GetMapping("/emp/{id}"):等价于@RequestMapping(value = "/dept/{id}",method = RequestMethod.GET)
- /emp/{id}:controller中的url采用restful形式,不会的请自行百度
- @PathVariable("id"):将url中相对应参数名的值绑定到指定的形参上
- 最终项目结构目录如下:
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二、项目测试
- 启动项目,在url地址栏输入插入操作:http://localhost:8080/emp?lastName=AAA&[email protected]&gender=1
- 观察数据库,看是否插入成功
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- 再在url地址栏输入查询操作:http://localhost:8080/emp/1
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- 至此,springboot整合mybatis成功!如果你失败了,继续调试吧骚年!刚搬来博客园,请多多关照手动滑稽--
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原文地址:https://www.cnblogs.com/cuiyanan/p/10206480.html
时间: 2024-08-02 19:16:37