MySql插入语句时报错,错误代码1062

在执行MySQL插入语句时遇到错误1062,原因是尝试插入的数据与已存在的记录在'order_number'字段上冲突,该字段要求数据唯一。为解决问题,需要检查并调整插入数据,确保'order_number'的唯一性。

MySql插入语句时报错,错误代码1062

  • mysql 工具操作报错

mysql工具报错

  • 程序运行报错

Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry ‘123456’ for key ‘order_number’
; Duplicate entry ‘123456’ for key ‘order_number’; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry ‘123456’ for key ‘order_number’
at org.springframework.jdbc.support.SQLErrorCodeSQLExceptionTranslator.doTranslate(SQLErrorCodeSQLExceptionTranslator.java:243)
at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:72)
at org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:73)
at org.mybatis.spring.SqlSessionTemplateSqlSessionInterceptor.invoke(SqlSessionTemplate.java:446)atcom.sun.proxy.SqlSessionInterceptor.invoke(SqlSessionTemplate.java:446) at com.sun.proxy.SqlSessionInterceptor.invoke(SqlSessionTemplate.java:446)atcom.sun.proxy.Proxy115.update(Unknown Source)
at org.mybatis.spring.SqlSessionTemplate.update(SqlSessionTemplate.java:294)
at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:63)
at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:59)
at com.sun.proxy.Proxy143.updateSysTaskBuyerItem(UnknownSource)atcom.ty.qianye.project.common.service.impl.SysTaskBuyerItemServiceImpl.updateSysTaskBuyerItem(SysTaskBuyerItemServiceImpl.java:108)atcom.ty.qianye.project.common.service.impl.SysTaskBuyerItemServiceImpl.subTask(SysTaskBuyerItemServiceImpl.java:513)atcom.ty.qianye.project.common.service.impl.SysTaskBuyerItemServiceImplProxy143.updateSysTaskBuyerItem(Unknown Source) at com.ty.qianye.project.common.service.impl.SysTaskBuyerItemServiceImpl.updateSysTaskBuyerItem(SysTaskBuyerItemServiceImpl.java:108) at com.ty.qianye.project.common.service.impl.SysTaskBuyerItemServiceImpl.subTask(SysTaskBuyerItemServiceImpl.java:513) at com.ty.qianye.project.common.service.impl.SysTaskBuyerItemServiceImplProxy143.updateSysTaskBuyerItem(UnknownSource)atcom.ty.qianye.project.common.service.impl.SysTaskBuyerItemServiceImpl.updateSysTaskBuyerItem(SysTaskBuyerItemServiceImpl.java:108)atcom.ty.qianye.project.common.service.impl.SysTaskBuyerItemServiceImpl.subTask(SysTaskBuyerItemServiceImpl.java:513)atcom.ty.qianye.project.common.service.impl.SysTaskBuyerItemServiceImplFastClassBySpringCGLIBFastClassBySpringCGLIBFastClassBySpringCGLIB939c8fb9.invoke(<generated>)atorg.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)atorg.springframework.aop.framework.CglibAopProxy939c8fb9.invoke(<generated>) at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218) at org.springframework.aop.framework.CglibAopProxy939c8fb9.invoke(<generated>)atorg.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)atorg.springframework.aop.framework.CglibAopProxyDynamicAdvisedInterceptor.intercept(CglibAopProxy.java:687)
at com.ty.qianye.project.common.service.impl.SysTaskBuyerItemServiceImplEnhancerBySpringCGLIBEnhancerBySpringCGLIBEnhancerBySpringCGLIB16462047.subTask()
at com.ty.qianye.project.buyerapp.order.controller.BuyerTaskBuyerItemController.subTask(BuyerTaskBuyerItemController.java:342)
at com.ty.qianye.project.buyerapp.order.controller.BuyerTaskBuyerItemControllerFastClassBySpringCGLIBFastClassBySpringCGLIBFastClassBySpringCGLIBb4a179f2.invoke()
at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
at org.springframework.aop.framework.CglibAopProxyCglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:752)atorg.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)atorg.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:295)atorg.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:98)atorg.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)atorg.springframework.security.access.intercept.aopalliance.MethodSecurityInterceptor.invoke(MethodSecurityInterceptor.java:69)atorg.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)atorg.springframework.aop.framework.CglibAopProxyCglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:752) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163) at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:295) at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:98) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) at org.springframework.security.access.intercept.aopalliance.MethodSecurityInterceptor.invoke(MethodSecurityInterceptor.java:69) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) at org.springframework.aop.framework.CglibAopProxyCglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:752)atorg.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)atorg.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:295)atorg.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:98)atorg.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)atorg.springframework.security.access.intercept.aopalliance.MethodSecurityInterceptor.invoke(MethodSecurityInterceptor.java:69)atorg.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)atorg.springframework.aop.framework.CglibAopProxyDynamicAdvisedInterceptor.intercept(CglibAopProxy.java:691)
at com.ty.qianye.project.buyerapp.order.controller.BuyerTaskBuyerItemControllerEnhancerBySpringCGLIBEnhancerBySpringCGLIBEnhancerBySpringCGLIBfd9aff35.subTask()
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:105)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:893)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:798)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:660)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at com.github.xiaoymin.knife4j.spring.filter.ProductionSecurityFilter.doFilter(ProductionSecurityFilter.java:53)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at com.github.xiaoymin.knife4j.spring.filter.SecurityBasicAuthFilter.doFilter(SecurityBasicAuthFilter.java:90)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:113)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at com.alibaba.druid.support.http.WebStatFilter.doFilter(WebStatFilter.java:124)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at com.ty.qianye.common.filter.RepeatableFilter.doFilter(RepeatableFilter.java:43)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.security.web.FilterChainProxyVirtualFilterChain.doFilter(FilterChainProxy.java:320)atorg.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:127)atorg.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:91)atorg.springframework.security.web.FilterChainProxyVirtualFilterChain.doFilter(FilterChainProxy.java:320) at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:127) at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:91) at org.springframework.security.web.FilterChainProxyVirtualFilterChain.doFilter(FilterChainProxy.java:320)atorg.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:127)atorg.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:91)atorg.springframework.security.web.FilterChainProxyVirtualFilterChain.doFilter(FilterChainProxy.java:334)
at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:119)
at org.springframework.security.web.FilterChainProxyVirtualFilterChain.doFilter(FilterChainProxy.java:334)atorg.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:137)atorg.springframework.security.web.FilterChainProxyVirtualFilterChain.doFilter(FilterChainProxy.java:334) at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:137) at org.springframework.security.web.FilterChainProxyVirtualFilterChain.doFilter(FilterChainProxy.java:334)atorg.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:137)atorg.springframework.security.web.FilterChainProxyVirtualFilterChain.doFilter(FilterChainProxy.java:334)
at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:111)
at org.springframework.security.web.FilterChainProxyVirtualFilterChain.doFilter(FilterChainProxy.java:334)atorg.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:170)atorg.springframework.security.web.FilterChainProxyVirtualFilterChain.doFilter(FilterChainProxy.java:334) at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:170) at org.springframework.security.web.FilterChainProxyVirtualFilterChain.doFilter(FilterChainProxy.java:334)atorg.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:170)atorg.springframework.security.web.FilterChainProxyVirtualFilterChain.doFilter(FilterChainProxy.java:334)
at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63)
at org.springframework.security.web.FilterChainProxyVirtualFilterChain.doFilter(FilterChainProxy.java:334)atcom.ty.qianye.framework.security.filter.JwtAuthenticationTokenFilter.doFilterInternal(JwtAuthenticationTokenFilter.java:42)atorg.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)atorg.springframework.security.web.FilterChainProxyVirtualFilterChain.doFilter(FilterChainProxy.java:334) at com.ty.qianye.framework.security.filter.JwtAuthenticationTokenFilter.doFilterInternal(JwtAuthenticationTokenFilter.java:42) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) at org.springframework.security.web.FilterChainProxyVirtualFilterChain.doFilter(FilterChainProxy.java:334)atcom.ty.qianye.framework.security.filter.JwtAuthenticationTokenFilter.doFilterInternal(JwtAuthenticationTokenFilter.java:42)atorg.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)atorg.springframework.security.web.FilterChainProxyVirtualFilterChain.doFilter(FilterChainProxy.java:334)
at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:116)
at org.springframework.security.web.FilterChainProxyVirtualFilterChain.doFilter(FilterChainProxy.java:334)atorg.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:74)atorg.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)atorg.springframework.security.web.FilterChainProxyVirtualFilterChain.doFilter(FilterChainProxy.java:334) at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:74) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) at org.springframework.security.web.FilterChainProxyVirtualFilterChain.doFilter(FilterChainProxy.java:334)atorg.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:74)atorg.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)atorg.springframework.security.web.FilterChainProxyVirtualFilterChain.doFilter(FilterChainProxy.java:334)
at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:105)
at org.springframework.security.web.FilterChainProxyVirtualFilterChain.doFilter(FilterChainProxy.java:334)atorg.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:56)atorg.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)atorg.springframework.security.web.FilterChainProxyVirtualFilterChain.doFilter(FilterChainProxy.java:334) at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:56) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) at org.springframework.security.web.FilterChainProxyVirtualFilterChain.doFilter(FilterChainProxy.java:334)atorg.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:56)atorg.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)atorg.springframework.security.web.FilterChainProxyVirtualFilterChain.doFilter(FilterChainProxy.java:334)
at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:215)
at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:178)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:358)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:271)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:94)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
at org.apache.coyote.AbstractProtocolConnectionHandler.process(AbstractProtocol.java:868)atorg.apache.tomcat.util.net.NioEndpointConnectionHandler.process(AbstractProtocol.java:868) at org.apache.tomcat.util.net.NioEndpointConnectionHandler.process(AbstractProtocol.java:868)atorg.apache.tomcat.util.net.NioEndpointSocketProcessor.doRun(NioEndpoint.java:1590)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutorWorker.run(ThreadPoolExecutor.java:617)atorg.apache.tomcat.util.threads.TaskThreadWorker.run(ThreadPoolExecutor.java:617) at org.apache.tomcat.util.threads.TaskThreadWorker.run(ThreadPoolExecutor.java:617)atorg.apache.tomcat.util.threads.TaskThreadWrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)

  • 造成上述问题的原因为,插入的数据,已经存在,并且该字段要求数据是唯一的,调整数据即可
### 插入触发器导致插入数据失败的常见原因及解决方法 在使用 MySQL 触发器,特别是在 `BEFORE INSERT` 或 `AFTER INSERT` 触发器中执行额外的数据操作或校验逻辑,可能会导致主表插入操作失败。以下是常见的错误原因及排查与解决方案。 #### 1. **触发器中引用了不存在的字段** 如果在触发器内部尝试访问目标表中并不存在的列(例如新增了一个字段名拼写错误),或者试图向另一个表插入数据目标表结构不匹配,就会导致插入失败。例如,尝试插入一个名为 `aa` 的字段,但该字段在目标表中并不存在,此会抛出错误[^2]。 ```sql -- 示例:触发器中引用了不存在的字段 DELIMITER // CREATE TRIGGER trg_after_insert AFTER INSERT ON source_table FOR EACH ROW BEGIN -- 假设 target_table 中没有 aa 字段,则下面语报错 INSERT INTO target_table (id, name, aa) VALUES (NEW.id, NEW.name, 'some_value'); END;// DELIMITER ; ``` **解决方案:** - 检查触发器代码中的所有字段名称是否与目标表的字段一致。 - 使用 `DESCRIBE table_name;` 或 `SHOW CREATE TABLE table_name;` 查看表结构。 - 修改触发器逻辑,确保插入的目标表字段存在且类型兼容。 #### 2. **行级触发器频繁触发带来的性能问题** MySQL 仅支持行级触发器(Row-Level Trigger),即每插入一行数据都会触发一次触发器。当批量插入大量数据(如一次性插入 1000 条记录),触发器会被执行 1000 次,可能导致严重的性能瓶颈,甚至超或锁竞争[^1]。 ```sql -- 示例:批量插入语 INSERT INTO cur_table(id, name) VALUES (1, '周一'), (2, '周二'), ..., (1000, '周一千'); ``` **解决方案:** - 避免在对性能敏感的场景中使用触发器。 - 如果必须使用触发器,应优化其内部逻辑,减少复杂度和资源消耗。 - 考虑将部分业务逻辑从数据库层迁移到应用层处理。 - 在大数据量导入,可考虑临禁用触发器或使用批量处理策略替代触发器行为(如 `INSERT IGNORE`、`ON DUPLICATE KEY UPDATE`)[^4]。 #### 3. **触发器中引发约束冲突** 触发器可能执行插入、更新或删除操作,若这些操作违反了外键约束、唯一性约束或其他表约束(如非空字段未赋值),则会导致整个插入操作失败。 **示例:** ```sql -- 假设 target_table 的 id 是主键,且已存在某个 id 值 DELIMITER // CREATE TRIGGER trg_after_insert AFTER INSERT ON source_table FOR EACH ROW BEGIN INSERT INTO target_table (id, name) VALUES (NEW.id, NEW.name); END;// DELIMITER ; ``` 如果 `NEW.id` 已存在于 `target_table` 中,则插入会因主键冲突而失败。 **解决方案:** - 在触发器中加入条件判断,避免重复插入相同主键。 - 使用 `INSERT IGNORE` 忽略冲突,或使用 `ON DUPLICATE KEY UPDATE` 替代插入操作。 - 明确处理异常情况,如通过 `DECLARE CONTINUE HANDLER` 捕获 SQL 异常并做相应处理。 #### 4. **触发器逻辑复杂导致死锁或锁等待** 触发器中涉及多个表的操作,尤其是在高并发环境下,容易引发锁竞争或死锁问题,进而导致插入失败。 **解决方案:** - 尽量简化触发器逻辑,避免跨表复杂操作。 - 确保事务中涉及的表按固定顺序访问,以降低死锁概率。 - 监控并分析死锁日志(`SHOW ENGINE INNODB STATUS`),优化相关 SQL。 #### 5. **触发器定义语法错误或逻辑错误** 触发器本身可能存在语法错误或逻辑错误(如变量未声明、流程控制错误等),也会导致插入失败。 **解决方案:** - 使用 `SHOW CREATE TRIGGER trigger_name;` 检查触发器定义。 - 在测试环境中逐步调试触发器逻辑,确保无语法错误。 - 使用日志输出(如插入到日志表)辅助排查触发器执行路径。 --- ###
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