Mybatis Plus#

约 65 个字 6 行代码预计阅读时间 2 分钟

入门案例#

创建项目，导入相关依赖：

XML

<?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>3.3.2</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.luguosong</groupId>
    <artifactId>mybatis-plus-hello</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>mybatis-plus-hello</name>
    <description>mybatis-plus-hello</description>
    <url/>
    <licenses>
        <license/>
    </licenses>
    <developers>
        <developer/>
    </developers>
    <scm>
        <connection/>
        <developerConnection/>
        <tag/>
        <url/>
    </scm>
    <properties>
        <java.version>17</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>

        <dependency>
            <groupId>com.mysql</groupId>
            <artifactId>mysql-connector-j</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <!--MyBatis-Plus依赖-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-spring-boot3-starter</artifactId>
            <version>3.5.7</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

application.yml文件配置数据库连接：

YAML

spring:
  datasource:
    driverClassName: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/learn_mybatis
    username: root
    password: 12345678

在 Spring Boot 启动类中添加 @MapperScan 注解，扫描 Mapper 文件夹:

Java

package com.luguosong.mybatisplushello;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
@MapperScan("com.luguosong.mybatisplushello.mapper")
public class MybatisPlusHelloApplication {

    public static void main(String[] args) {
        SpringApplication.run(MybatisPlusHelloApplication.class, args);
    }

}

编写实体类：

Java

package com.luguosong.mybatisplushello.entity;

import lombok.Data;

import java.sql.Date;

/**
 * @author luguosong
 */
@Data
public class Employees {
    private Integer id;
    private String firstName;
    private String lastName;
    private String position;
    private Date hireDate;
    private Integer departmentId;
}

编写 Mapper 接口类:

Java

package com.luguosong.mybatisplushello.mapper;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.luguosong.mybatisplushello.entity.Employees;

/**
 * @author luguosong
 */
public interface EmployeesMapper extends BaseMapper<Employees> {
}

编写测试类：

Java

package com.luguosong.mybatisplushello;

import com.luguosong.mybatisplushello.entity.Employees;
import com.luguosong.mybatisplushello.mapper.EmployeesMapper;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.util.List;

@SpringBootTest
class MybatisPlusHelloApplicationTests {

    @Autowired
    private EmployeesMapper employeesMapper;

    @Test
    void testSelect() {
        List<Employees> employees = employeesMapper.selectList(null);
        System.out.println(employees);
    }

}

Mybatis Plus#

入门案例#

代码生成器#

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