MyBatis Plus入门使用
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Mybatis在持久层框架中还是比较火的，可以通过解析xml文件中的SQL语句，从而操作数据库。但由于需要写SQL语句，所以会产生大量的xml文件，而且还存在着大量的简单的CRUD语句，这无疑大大降低了程序员的开发效率,MyBatis-Plus正好弥补了这些短板。
MyBatis Plus 是国内人员开发的 MyBatis 增强工具，在 MyBatis 的基础上只做增强不做改变，为简化开发、提高效率而生。MyBatis Plus 的核心功能有：支持通用的 CRUD、代码生成器与条件构造器。
MyBatis-Plus 入门
本示例程序是基于JDK 1.8 + MySql 8.0 + Maven 3.6.1 + IDEA2020的基础上进行开发的
1.创建Maven工程，引入核心依赖
<!-- https://mvnrepository.com/artifact/com.baomidou/mybatis-plus -->
<!--mybatis-plus依赖-->
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus</artifactId>
<version>2.3</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.47</version>
</dependency>
<!--lombok依赖-->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.16</version>
</dependency>
<!-- https://mvnrepository.com/artifact/log4j/log4j -->
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-orm</artifactId>
<version>5.0.5.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.0.5.RELEASE</version>
</dependency>
2.配置数据源，整合Spring与mybatis-plus
（1）数据源 jdbc.properties
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://127.0.0.1:3306/test?characterEncoding=utf8&useSSL=false&serverTimezone=UTC&rewriteBatchedStatements=true
jdbc.username=root
jdbc.password=root
(2)MyBatis 全局配置文件 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>
</configuration>
(3) Spring 配置文件 spring-dao.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:jee="http://www.springframework.org/schema/jee"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-4.0.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd">
<!-- 配置整合mybatis-plus过程 -->
<!-- 1、配置数据库相关参数properties -->
<context:property-placeholder location="classpath:jdbc.properties" />
<!-- 2、配置数据库连接池 -->
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
<property name="driverClassName" value="${jdbc.driver}"/>
<property name="url" value="${jdbc.url}"/>
<property name="username" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
</bean>
<!-- mybatis的sqlsessionFactorybean：org.mybatis.spring.SqlSessionFactoryBean-->
<!-- 3、配置mybatis-plus的sqlSessionFactory -->
<bean id="sqlSessionFactory" class="com.baomidou.mybatisplus.spring.MybatisSqlSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="configLocation" value="classpath:mybatis-config.xml"/>
<property name="typeAliasesPackage" value="entity"/>
</bean>
<!-- 4、DAO接口所在包名，Spring会自动查找其下的类 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="dao" />
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
</bean>
</beans>
3.编写实体和接口
（1）实体类 entity.Student
package entity;
import com.baomidou.mybatisplus.annotations.TableField;
import com.baomidou.mybatisplus.annotations.TableId;
import com.baomidou.mybatisplus.annotations.TableName;
import com.baomidou.mybatisplus.enums.IdType;
import lombok.Data;
@Data
@TableName("t_student")//与表名对应
public class Student {
//value与数据库主键列名一致，若实体类属性名与表主键列名一致可省略value
@TableId(value = "id",type = IdType.AUTO)//指定自增策略
private Integer id;
//若没有开启驼峰命名，或者表中列名不符合驼峰规则，可通过该注解指定数据库表中的列名，exist标明数据表中有没有对应列
// @TableField(value = "sno",exist = true)
private String sno;
// @TableField(value = "sname",exist = true)
private String sname;
// @TableField(value = "sex",exist = true)
private String sex;
}
(2) 编写接口 dao.StudentDao
package dao;
import com.baomidou.mybatisplus.mapper.BaseMapper;
import entity.Student;
//接口继承BaseMapper<>
public interface StudentDao extends BaseMapper<Student> {
}
4.测试
（1）数据库连接测试
import dao.StudentDao;
import entity.Student;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import javax.sql.DataSource;
import java.sql.SQLException;
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration({"classpath:spring-dao.xml"})
public class test {
@Autowired
private DataSource dataSource;
@Autowired
private StudentDao dao;
@Test
public void testDataSource() throws SQLException {
System.out.println(dataSource.getConnection());
}
（2）数据库更新操作测试
@Test
public void testInsert(){
Student student = new Student();
student.setSno("123456");
student.setSex("男");
student.setSname("wyc");
dao.insert(student);
}
（3）数据库查询操作测试
@Test
public void testSelect(){
System.out.println(dao.selectById(97));
}
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版权声明：本文为CSDN博主「Ego1stZz」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：
https://blog.csdn.net/qq_43739109/article/details/114991777
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