实现MybatisPlus乐观锁

1、实体类中添加version字段及相关注解

@Version
@TableField(fill = FieldFill.INSERT)//第一次添加数据时使其有个默认值1
private Integer version;

2、添加配置类

import com.baomidou.mybatisplus.extension.plugins.MybatisPlusInterceptor;
import com.baomidou.mybatisplus.extension.plugins.inner.OptimisticLockerInnerInterceptor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.transaction.annotation.EnableTransactionManagement;

@EnableTransactionManagement
@Configuration
public class MyBatisPlusConfig {

   @Bean
   public MybatisPlusInterceptor mybatisPlusInterceptor(){
      MybatisPlusInterceptor mybatisPlusInterceptor = new MybatisPlusInterceptor();
      mybatisPlusInterceptor.addInnerInterceptor( new OptimisticLockerInnerInterceptor());
      return mybatisPlusInterceptor;
   }
}

3、接口请求（update set version = version + 1 where version = ?）

@ResponseBody
@GetMapping("/lock")
public Result lock() {
    User user = userMapper.selectById(1);
    user.setName("乐观锁");
    userMapper.updateById(user);
    return Result.success();
}

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