EF Core知識筆記三
阿新 • • 發佈：2020-08-04
1、建立springboot工程
2、新增mybatis依賴和mysql依賴
3、建立實體類
4、建立資料庫表
5、建立application.properties檔案，配置資料庫連線
6、建立mapper介面
7、建立mapper對映檔案
8、在application.properties中配置mybatis資訊
1、新增依賴,注意springboot版本2.0.2
<?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 https://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>2.0.2.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>cn.lgy</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>1.1.1</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> <!--<exclusions>--> <!--<exclusion>--> <!--<groupId>org.junit.vintage</groupId>--> <!--<artifactId>junit-vintage-engine</artifactId>--> <!--</exclusion>--> <!--</exclusions>--> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
關鍵程式碼
<dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>1.1.1</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> </dependency>
2、建立實體類
package cn.lgy.domain; public class User { private Integer id; private String name; private String sex; private String address; public Integer getId() { return id; } public String getName() { return name; } public String getSex() { return sex; } public String getAddress() { return address; } public void setId(Integer id) { this.id = id; } public void setName(String name) { this.name = name; } public void setSex(String sex) { this.sex = sex; } public void setAddress(String address) { this.address = address; } @Override public String toString() { return "User{" + "id=" + id + ", name='" + name + '\'' + ", sex='" + sex + '\'' + ", address='" + address + '\'' + '}'; } }
3、建立資料庫表
4、建立application.properties檔案，配置資料庫連線
#資料庫配置 spring.datasource.driverClassName=com.mysql.jdbc.Driver spring.datasource.url=jdbc:mysql://localhost:3306/springboot-9501?useUnicode=true&characterEncoding=utf8 spring.datasource.username=root spring.datasource.password=root #配置mybatis配置資訊 #pojo別名配置 mybatis.type-aliases-package=cn.lgy.domain #載入mybatis對映檔案 mybatis.mapper-locations=classpath:mapper/*Mapper.xml
5、建立mapper介面
package cn.lgy.mapper; import cn.lgy.domain.User; import org.apache.ibatis.annotations.Mapper; import java.util.List; @Mapper public interface UserMapper { public List<User> queryUserList(); }
6、建立mapper對映檔案
<?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="cn.lgy.mapper.UserMapper"> <select id="queryUserList" resultType="cn.lgy.domain.User"> select * from user </select> </mapper>
7、將mybatis資訊註冊到springboot中，
application.properties中新增以下內容
#配置mybatis配置資訊
#pojo別名配置
mybatis.type-aliases-package=cn.lgy.domain
#載入mybatis對映檔案
mybatis.mapper-locations=classpath:mapper/*Mapper.xml
8、在啟動類上添加註解、
@MapperScan("cn/lgy/mapper")//用於掃描mapper包下的介面
@ComponentScan("cn.lgy.controller")//用於掃描controller或service包下的類
package cn.lgy.springbootmybatis; import org.mybatis.spring.annotation.MapperScan; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.context.annotation.ComponentScan; @SpringBootApplication @MapperScan("cn/lgy/mapper")//用於掃描mapper包下的介面 @ComponentScan("cn.lgy.controller")//用於掃描controller或service包下的類 public class SpringbootMybatisApplication { public static void main(String[] args) { SpringApplication.run(SpringbootMybatisApplication.class, args); } }
9、編寫controller測試
package cn.lgy.controller; import cn.lgy.domain.User; import cn.lgy.mapper.UserMapper; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.ResponseBody; import java.util.List; @Controller public class UserController { @Autowired UserMapper userMapper; @RequestMapping("/query") @ResponseBody public List<User> queryUserList(){ List<User> users = userMapper.queryUserList(); return users; } }
10、因為版本不同所以注意測試類上@Test註解的包匯入
package cn.lgy.springbootmybatis;
import org.junit.Test;
import org.springframework.boot.test.context.SpringBootTest;
@SpringBootTest
class SpringbootMybatisApplicationTests {
@Test
void contextLoads() {
}
}