SpringBoot爬坑记录_spring boot 记录访问量 mysql io太多了-优快云博客

本文链接：https://blog.youkuaiyun.com/weixin_44131142/article/details/103696806

本文深入探讨了SpringBoot中事务回滚机制，通过注解实现异常时的回滚操作，并介绍了如何解决配置类序列化失败的问题。此外，还详细讲解了SpringBoot下跨域请求的配置方法，以及JPA查询时的参数传递技巧。

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Transactional事务回滚

//方法上增加注解
@Transactional(rollbackOn = Exception.class)
public void example() {
	try {

	} catch (Exception e) {
		// 设置异常时执行回滚
		TransactionAspectSupport.currentTransactionStatus().setRollbackOnly();
	}
}

配置类序列化失败

问题描述：

将配置类使用 JackSon 序列化时，出现序列化异常

SpringBoot请求跨域

package com.learnning.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.cors.UrlBasedCorsConfigurationSource;
import org.springframework.web.filter.CorsFilter;

/**
 * 
 * @ClassName: CustomCORSConfiguration
 * @Description: 配置跨域请求访问失败的问题
 * @author time
 * @date 2018/11/21
 */
@Configuration
public class CustomCORSConfiguration {

	private CorsConfiguration buildConfig() {
		CorsConfiguration corsConfiguration = new CorsConfiguration();
		corsConfiguration.addAllowedOrigin("*");
		corsConfiguration.addAllowedHeader("*");
		corsConfiguration.addAllowedMethod("*");
		return corsConfiguration;
	}

	@Bean
	public CorsFilter corsFilter() {
		UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
		source.registerCorsConfiguration("/**", buildConfig());
		return new CorsFilter(source);
	}

}

注: 引用链接: 周立解决方案

SpringBoot JPA查询传参

使用占位符?

@Query(value = "select account_id,user_name,validity from t_account where account_id = ?", nativeQuery = true)
User findByAccount_id(Long account_id);

使用命名化参数:name

@Query(value = "select account_id,user_name,validity from t_account where account_id =:id", nativeQuery = true)
User findByAccount_id(@Param("id") Long account_id);