MybatisPlus快速开始
2020.02.10 12:33
2020.02.10 12:33
1. 快速开始
1.1. 创建数据库
表结构
-- ----------------------------
-- Table structure for user
-- ----------------------------
DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
`id` int(10) UNSIGNED NOT NULL AUTO_INCREMENT,
`user_name` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL,
`password` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL,
`email` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL,
`age` int(11) NULL DEFAULT NULL,
PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 6 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci ROW_FORMAT = Dynamic;
SET FOREIGN_KEY_CHECKS = 1;
数据
INSERT INTO `mp_test`.`user`(`id`, `user_name`, `password`, `email`, `age`) VALUES (1, '张三', '123', 'admin@misiai.com', 12);
INSERT INTO `mp_test`.`user`(`id`, `user_name`, `password`, `email`, `age`) VALUES (2, '李四', '131212', 'lisi@misiai.com', 18);
INSERT INTO `mp_test`.`user`(`id`, `user_name`, `password`, `email`, `age`) VALUES (3, '王五', '8989', 'wangwu@misiai.com', 20);
INSERT INTO `mp_test`.`user`(`id`, `user_name`, `password`, `email`, `age`) VALUES (4, '赵六', '8989', 'zhaoliu@misiai.com', 28);
INSERT INTO `mp_test`.`user`(`id`, `user_name`, `password`, `email`, `age`) VALUES (5, '孙七', '9891', 'sunqi@misiai.com', 30);
1.2. 创建工程
我们这里常见SpringBoot的工程。
创建时,导入Mybatis:
1.3. 依赖一览
<?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>2.2.4.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.misiai</groupId>
<artifactId>mybatis-plus</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>mybatis-plus</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>2.1.1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.baomidou/mybatis-plus-boot-starter -->
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>3.3.1</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.47</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.21</version>
</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>
1.4. 添加配置
application.yml
spring:
datasource:
url: jdbc:mysql://localhost:3306/mp_test?useSSL=false
driver-class-name: com.mysql.jdbc.Driver
username: root
password: root
type: com.alibaba.druid.pool.DruidDataSource
#mybatis-plus:
# check-config-location:
这里我们使用了阿里的druid数据源,所以需要导入相应依赖。
在 Spring Boot 启动类中添加 @MapperScan 注解,扫描 Mapper 文件夹:
package com.misiai.mybatisplus;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
@MapperScan("com.misiai.mybatisplus.mapper")
public class MybatisPlusApplication {
public static void main(String[] args) {
SpringApplication.run(MybatisPlusApplication.class, args);
}
}
1.5. 编码
Bean User
package com.misiai.mybatisplus.bean;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@NoArgsConstructor
@AllArgsConstructor
public class User {
private Integer id;
private String user_name;
private String password;
private String email;
private Integer age;
}
接口:
package com.misiai.mybatisplus.mapper;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.misiai.mybatisplus.bean.User;
public interface UserMapper extends BaseMapper<User> {
}
1.6. 测试
@SpringBootTest
@RunWith(SpringRunner.class)
class MybatisPlusApplicationTests {
@Autowired
private UserMapper userMapper;
@Autowired
private DataSource dataSource;
@Test
void test01() throws SQLException {
System.out.println("dataSource = " + dataSource);
System.out.println(dataSource.getConnection());
List<User> users = userMapper.selectList(null);
for (User user : users) {
System.out.println("user = " + user);
}
}
}
1.7. 打印日志
SpringBoot
项目添加如下配置:
mybatis-plus:
configuration:
log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
即可打印SQL语句等
本节阅读完毕!
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