作者：一万20122012_982 | 来源：互联网 | 2023-09-18 13:50
1、Mybatis和MybatisPlus区别Mybatis：ssm框架中，除了要写xml配置，还要写xml的sql文件，比如：usermapper.xmlMybatisPlus：
1、Mybatis和MybatisPlus区别
Mybatis：ssm框架中，除了要写xml配置，还要写xml的sql文件，比如：usermapper.xml
MybatisPlus：基本上不用写一条SQL，如果业务层不复杂，完全不用业务层
MybatisPlus特性：无侵入，依赖少，防止SQL注入，通用CRUD，主键生成策略，代码生成，内置分页插件
主键生成策略：IdType.AUTO（自动）、IdType.INPUT（用户输入）、IdType.ID_WORKER（自动）、IdType.UUID（自动）
配置方法：主键ID上加注解，@TableId(value="ID",type="IdType.AUTO")，一般情况下推荐大家使用自动增长主键
2、配置文件（application.properties）
spring.datasource.driverClassName=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/test?characterEncoding=UTF-8
spring.datasource.username=root
spring.datasource.password=root
spring.thymeleaf.mode=HTML5
spring.thymeleaf.encoding=UTF-8
spring.thymeleaf.content-type=text/html
#开发时关闭缓存，不然没法看到实时页面
spring.thymeleaf.cache=false
3、pom.xml中引入mybatis-plus的jar包
<dependency>
<groupId>com.baomidougroupId>
<artifactId>mybatis-plusartifactId>
<version>2.3.3version>
dependency>
4、创建MybatisPlusConfig类
package com.cppdy.config;
import javax.sql.DataSource;
import org.apache.ibatis.mapping.DatabaseIdProvider;
import org.apache.ibatis.plugin.Interceptor;
import org.mybatis.spring.boot.autoconfigure.MybatisProperties;
import org.mybatis.spring.boot.autoconfigure.SpringBootVFS;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.DefaultResourceLoader;
import org.springframework.core.io.ResourceLoader;
import org.springframework.util.ObjectUtils;
import org.springframework.util.StringUtils;
import com.baomidou.mybatisplus.MybatisConfiguration;
import com.baomidou.mybatisplus.MybatisXMLLanguageDriver;
import com.baomidou.mybatisplus.plugins.PaginationInterceptor;
import com.baomidou.mybatisplus.spring.MybatisSqlSessionFactoryBean;
@Configuration
public class MybatisPlusConfig {
@Autowired
private DataSource dataSource;
@Autowired
private MybatisProperties properties;
@Autowired
private ResourceLoader resourceLoader = new DefaultResourceLoader();
@Autowired(required = false)
private Interceptor[] interceptors;
@Autowired(required = false)
private DatabaseIdProvider databaseldProvider;
/**
* mybatis-plus分页插件
*/
@Bean
public PaginationInterceptor paginationInterceptor() {
PaginationInterceptor page = new PaginationInterceptor();
page.setDialectType("mysql");
return page;
}
/**
* 这里全部使用mybatis-autoconfigure已经自动加载的资源。不手动指定配置文件和mybatis-boot的配置文件同步
*/
@Bean
public MybatisSqlSessionFactoryBean mybatisSqlSessionFactoryBean() {
MybatisSqlSessionFactoryBean mybatisPlus = new MybatisSqlSessionFactoryBean();
mybatisPlus.setDataSource(dataSource);
mybatisPlus.setVfs(SpringBootVFS.class);
if (StringUtils.hasText(this.properties.getConfigLocation())) {
mybatisPlus.setConfigLocation(this.resourceLoader.getResource(this.properties.getConfigLocation()));
}
mybatisPlus.setConfiguration(properties.getConfiguration());
if (!ObjectUtils.isEmpty(this.interceptors)) {
mybatisPlus.setPlugins(this.interceptors);
}
MybatisConfiguration mc = new MybatisConfiguration();
mc.setDefaultScriptingLanguage(MybatisXMLLanguageDriver.class);
mybatisPlus.setConfiguration(mc);
if (this.databaseldProvider != null) {
mybatisPlus.setDatabaseIdProvider(this.databaseldProvider);
}
if (StringUtils.hasLength(this.properties.getTypeAliasesPackage())) {
mybatisPlus.setTypeAliasesPackage(this.properties.getTypeAliasesPackage());
}
if (StringUtils.hasLength(this.properties.getTypeHandlersPackage())) {
mybatisPlus.setTypeHandlersPackage(this.properties.getTypeHandlersPackage());
}
if (ObjectUtils.isEmpty(this.properties.resolveMapperLocations())) {
mybatisPlus.setMapperLocations(this.properties.resolveMapperLocations());
}
return mybatisPlus;
}
}
5、UserMapper接口
package com.cppdy.mapper;
import org.apache.ibatis.annotations.Mapper;
import com.baomidou.mybatisplus.mapper.BaseMapper;
import com.cppdy.entity.User;
@Mapper
public interface UserMapper extends BaseMapper{
}
6、UserService接口
package com.cppdy.service;
public interface UserService {
public void update(String username, int id);
}
7、UserServiceImpl实现类
package com.cppdy.service.impl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import com.cppdy.entity.User;
import com.cppdy.mapper.UserMapper;
import com.cppdy.service.UserService;
@Service
public class UserServiceImpl implements UserService {
@Autowired
private UserMapper userMapper;
// 开启事务管理
@Transactional
public void update(String username, int id) {
User user = userMapper.selectById(id);
user.setUsername(username);
// 更新一条数据
userMapper.updateById(user);
}
}
8、HelloWordController类
package com.cppdy.controller;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import com.cppdy.entity.User;
import com.cppdy.mapper.UserMapper;
import com.cppdy.service.UserService;
@RestController
public class HelloWordController {
@Autowired
private UserMapper userMapper;
@Autowired
private UserService userService;
@RequestMapping("hello")
public String hello() {
return "HelloWord";
}
@RequestMapping("excep")
public String excep() {
int a = 2 / 0;
return "Hello Exception";
}
@RequestMapping("getUserById")
public Object getUserById(int id) {
return userMapper.selectById(id);
}
@RequestMapping("insert")
public void insert(String username) {
User user = new User();
user.setUsername(username);
userMapper.insert(user);
}
@RequestMapping("update")
public void update(String username, int id) {
userService.update(username, id);
}
}
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