精华内容
下载资源
问答
  • 主要介绍了MySQL数据库连接异常汇总,帮助大家更好的理解和学习mysql,感兴趣的朋友可以了解下
  • 用于描述win7系统下数据连接异常处理的方法
  • 数据库连接异常

    千次阅读 2018-05-15 09:14:35
    [Err] 1682 - Native table 'performance_schema'.'session_status' has the wrong structure(注:连接异常,应该是服务器的原因,服务器宕机了)
    [Err] 1682 - Native table 'performance_schema'.'session_status' has the wrong structure(注:连接异常,应该是服务器的原因,服务器宕机了)
    展开全文
  • springboot整合mybatis数据库连接异常!

    千次阅读 2019-08-13 17:51:56
    今天学习spring boot整合mybatis 并使用driud数据库连接池,照着老师文档上的代码copy的,但是我这里却出了异常. 异常信息: Caused by: java.sql.SQLNonTransientConnectionException: Could not create connection to...

    java.sql.SQLNonTransientConnectionException: Could not create connection to database server. Attempted reconnect 10 times. Giving up.

    今天学习spring boot整合mybatis 并使用driud数据库连接池,照着文档上的代码copy的,但是我这里却出了异常.

    异常信息:

    Caused by: java.sql.SQLNonTransientConnectionException: Could not create connection to database server. Attempted reconnect 10 times. Giving up.
    	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:110) ~[mysql-connector-java-8.0.17.jar:8.0.17]
    	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:97) ~[mysql-connector-java-8.0.17.jar:8.0.17]
    	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:89) ~[mysql-connector-java-8.0.17.jar:8.0.17]
    	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:63) ~[mysql-connector-java-8.0.17.jar:8.0.17]
    	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:73) ~[mysql-connector-java-8.0.17.jar:8.0.17]
    	at com.mysql.cj.jdbc.ConnectionImpl.connectWithRetries(ConnectionImpl.java:897) ~[mysql-connector-java-8.0.17.jar:8.0.17]
    	at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:822) ~[mysql-connector-java-8.0.17.jar:8.0.17]
    	at com.mysql.cj.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:447) ~[mysql-connector-java-8.0.17.jar:8.0.17]
    	at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:237) ~[mysql-connector-java-8.0.17.jar:8.0.17]
    	at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:199) ~[mysql-connector-java-8.0.17.jar:8.0.17]
    	at com.zaxxer.hikari.util.DriverDataSource.getConnection(DriverDataSource.java:136) ~[HikariCP-3.2.0.jar:na]
    	at com.zaxxer.hikari.pool.PoolBase.newConnection(PoolBase.java:369) ~[HikariCP-3.2.0.jar:na]
    	at com.zaxxer.hikari.pool.PoolBase.newPoolEntry(PoolBase.java:198) ~[HikariCP-3.2.0.jar:na]
    	at com.zaxxer.hikari.pool.HikariPool.createPoolEntry(HikariPool.java:467) ~[HikariCP-3.2.0.jar:na]
    	at com.zaxxer.hikari.pool.HikariPool.checkFailFast(HikariPool.java:541) ~[HikariCP-3.2.0.jar:na]
    	at com.zaxxer.hikari.pool.HikariPool.<init>(HikariPool.java:115) ~[HikariCP-3.2.0.jar:na]
    	at com.zaxxer.hikari.HikariDataSource.getConnection(HikariDataSource.java:112) ~[HikariCP-3.2.0.jar:na]
    	at org.springframework.jdbc.datasource.DataSourceUtils.fetchConnection(DataSourceUtils.java:157) ~[spring-jdbc-5.1.9.RELEASE.jar:5.1.9.RELEASE]
    	at org.springframework.jdbc.datasource.DataSourceUtils.doGetConnection(DataSourceUtils.java:115) ~[spring-jdbc-5.1.9.RELEASE.jar:5.1.9.RELEASE]
    	at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:78) ~[spring-jdbc-5.1.9.RELEASE.jar:5.1.9.RELEASE]
    	... 77 common frames omitted
    

    异常原因: mysql依赖版本问题 :此依赖默认mysql版本过高(我的mysql版本是5.1.37)

    <dependency>
          <groupId>mysql</groupId>
          <artifactId>mysql-connector-java</artifactId>
    </dependency>
    

    解决办法:加上一个版本

    <dependency>
         <groupId>mysql</groupId>
         <artifactId>mysql-connector-java</artifactId>
         <version>5.1.37</version>
    </dependency>
    

    注意配置问题:
    如果你的数据库是高版本,比如8.0以上的数据库驱动是com.mysql.cj.jdbc.Driver这个包,并且在数据库的url地址在末尾加上时区,即加上&serverTimezone=GMT

    spring:
      datasource: # 数据库配置
        driver-class-name: com.mysql.cj.jdbc.Driver
        url: jdbc:mysql://localhost:3306/springboot?useSSL=false&useUnicode=true&characterEncoding=utf-8&allowMultiQueries=true&autoReconnect=true&failOverReadOnly=false&maxReconnects=10&serverTimezone=GMT
        username: root
        password: root
    

    如果是低版本就是com.mysql.jdbc.Driver这个包(我的是5.1.37)

    spring:
      datasource: # 数据库配置
        driver-class-name: com.mysql.jdbc.Driver
        url: jdbc:mysql://localhost:3306/springboot?useSSL=false&useUnicode=true&characterEncoding=utf-8&allowMultiQueries=true&autoReconnect=true&failOverReadOnly=false&maxReconnects=10
        username: root
        password: root
    

    重新启动并测试:
    成功

    问题解决!

    展开全文
  • NULL 博文链接:https://sarin.iteye.com/blog/888458
  • CM安装Hue测试hue数据库连接异常使用;
  • 数据库连接异常的解决过程

    万次阅读 2017-03-01 11:07:48
    没有细读错误,我感觉肯定是数据库连接池的问题,因为现在很多网站都连接到这个mysql数据库,所以我猜想应该是数据库连接数不太够用引起的问题,虽然是这样猜想,但是也需要确切的答案,所以还是要读一下异常信息,...

    首先先简述一下遇到的问题,今天早上来了之后,网站突然报404的问题,不废话,直接看tomcat的日志吧,日志如下:

    ### Error querying database.  Cause: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: The last packet successfully received from the server was 87,122,326 milliseconds ago.  The last packet sent successfully to the server was 87,122,533 milliseconds ago. is longer than the server configured value of 'wait_timeout'. You should consider either expiring and/or testing connection validity before use in your application, increasing the server configured values for client timeouts, or using the Connector/J connection property 'autoReconnect=true' to avoid this problem.
    ### The error may exist in com/shishuo/cms/dao/ArticleDao.xml
    ### The error may involve defaultParameterMap
    ### The error occurred while setting parameters
    ### SQL: select   count(*)   from article   where   path like ?"%" and status = 'display' and `check` = 'yes'
    ### Cause: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: The last packet successfully received from the server was 87,122,326 milliseconds ago.  The last packet sent successfully to the server was 87,122,533 milliseconds ago. is longer than the server configured value of 'wait_timeout'. You should consider either expiring and/or testing connection validity before use in your application, increasing the server configured values for client timeouts, or using the Connector/J connection property 'autoReconnect=true' to avoid this problem.
    ; SQL []; The last packet successfully received from the server was 87,122,326 milliseconds ago.  The last packet sent successfully to the server was 87,122,533 milliseconds ago. is longer than the server configured value of 'wait_timeout'. You should consider either expiring and/or testing connection validity before use in your application, increasing the server configured values for client timeouts, or using the Connector/J connection property 'autoReconnect=true' to avoid this problem.; nested exception is com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: The last packet successfully received from the server was 87,122,326 milliseconds ago.  The last packet sent successfully to the server was 87,122,533 milliseconds ago. is longer than the server configured value of 'wait_timeout'. You should consider either expiring and/or testing connection validity before use in your application, increasing the server configured values for client timeouts, or using the Connector/J connection property 'autoReconnect=true' to avoid this problem.
    	at org.springframework.jdbc.support.SQLExceptionSubclassTranslator.doTranslate(SQLExceptionSubclassTranslator.java:99)
    	at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:72)
    	at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:80)
    	at org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:73)
    	at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:368)
    	at $Proxy12.selectOne(Unknown Source)
    	at org.mybatis.spring.SqlSessionTemplate.selectOne(SqlSessionTemplate.java:163)
    	at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:63)
    	at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:43)
    	at $Proxy21.getArticleCountOfDisplayByPath(Unknown Source)
    	at com.shishuo.cms.service.ArticleService.getArticlePageByFolderId(ArticleService.java:288)
    	at com.shishuo.cms.service.ArticleService.getPictureArticle(ArticleService.java:419)
    	at com.shishuo.cms.service.ArticleService$$FastClassBySpringCGLIB$$a703cd95.invoke(<generated>)
    	at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
    	at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:629)
    	at com.shishuo.cms.service.ArticleService$$EnhancerBySpringCGLIB$$facc1f69.getPictureArticle(<generated>)
    	at com.lvsuo.portal.controller.IndexController.index(IndexController.java:50)
    	at com.lvsuo.portal.controller.IndexController.home(IndexController.java:39)
    	at sun.reflect.GeneratedMethodAccessor74.invoke(Unknown Source)
    	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    	at java.lang.reflect.Method.invoke(Method.java:597)
    	at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:215)
    	at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
    	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
    	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:745)
    	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:685)
    	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)
    	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:919)
    	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:851)
    	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:953)
    	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:844)
    	at javax.servlet.http.HttpServlet.service(HttpServlet.java:624)
    	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:829)
    	at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
    	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
    	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
    	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:106)
    	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
    	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
    	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
    	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
    	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
    	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
    	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
    	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
    	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:423)
    	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1079)
    	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:620)
    	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
    	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    	at java.lang.Thread.run(Thread.java:662)
    Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: The last packet successfully received from the server was 87,122,326 milliseconds ago.  The last packet sent successfully to the server was 87,122,533 milliseconds ago. is longer than the server configured value of 'wait_timeout'. You should consider either expiring and/or testing connection validity before use in your application, increasing the server configured values for client timeouts, or using the Connector/J connection property 'autoReconnect=true' to avoid this problem.
    	at sun.reflect.GeneratedConstructorAccessor42.newInstance(Unknown Source)
    	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
    	at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
    	at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
    	at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1121)
    	at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:3938)
    	at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2551)
    	at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2731)
    	at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2815)
    	at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2155)
    	at com.mysql.jdbc.PreparedStatement.execute(PreparedStatement.java:1379)
    	at org.apache.commons.dbcp.DelegatingPreparedStatement.execute(DelegatingPreparedStatement.java:172)
    	at org.apache.commons.dbcp.DelegatingPreparedStatement.execute(DelegatingPreparedStatement.java:172)
    	at org.apache.ibatis.executor.statement.PreparedStatementHandler.query(PreparedStatementHandler.java:56)
    	at org.apache.ibatis.executor.statement.RoutingStatementHandler.query(RoutingStatementHandler.java:70)
    	at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:57)
    	at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:259)
    	at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:132)
    	at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:105)
    	at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:81)
    	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:104)
    	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:98)
    	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectOne(DefaultSqlSession.java:62)
    	at sun.reflect.GeneratedMethodAccessor41.invoke(Unknown Source)
    	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    	at java.lang.reflect.Method.invoke(Method.java:597)
    	at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:358)
    	... 50 more
    Caused by: java.net.SocketException: Broken pipe
    	at java.net.SocketOutputStream.socketWrite0(Native Method)
    	at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:92)
    	at java.net.SocketOutputStream.write(SocketOutputStream.java:136)
    	at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:65)
    	at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:123)
    	at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:3919)
    	... 71 more
    

    这是全部的报错信息了,没有细读错误,我感觉肯定是数据库连接池的问题,因为现在很多网站都连接到这个mysql数据库,所以我猜想应该是数据库连接数不太够用引起的问题,虽然是这样猜想,但是也需要确切的答案,所以还是要读一下异常信息,大致如下:

    “从服务器成功地接收数据包是在87,122,326毫秒(1.0083602天)以前,最近往服务器发送成功的数据包是在87,122,533毫秒(1.0083626天)前,大于服务器配置的wait_timeout的值,你应该在使用应用之前,过期掉或者测试连接有效性,增加客户端过期时间的配置,或者使用autoReconnect=true来避免这个问题"。

    查看一下MySQL的配置,如下:

    mysql> show global variables like 'wait_timeout';
    +---------------+-------+
    | Variable_name | Value |
    +---------------+-------+
    | wait_timeout  | 28800 |
    +---------------+-------+
    1 row in set

    28800也就是8个小时的时间,所以肯定是连接过期了。

    从服务器说的话基本上已经很明显了,是因为数据库很长时间没有使用,导致了数据库和客户端之间的连接断开了,而且也提到了几种解决方式,如下:

    第一种(不推荐使用):增大wait_timeout的值,这种方式属于饮鸩止渴了,我可以配置过期时间为1年,但是这样增加了服务器的负担,让服务器的连接没有断开刷新的可能,而且,官网本来访问量就很小,如果增加wait_timeout的值,恰恰在这时间内没有访问,那么又会出现这个问题,所以,不使用这种方法。

    第二种(不推荐使用):在连接中使用autoReconnect=true,这个办法在错误信息提示中已经说过了,但是问题是,现在使用的并不是JDBC连接,而是使用的Sping来管理DBCP数据库连接池,连接的数据库连接使用JDBC的办法肯定是不合时宜的,而且DBCP肯定有相应的办法来解决该问题。

    第三种(推荐):使用DBCP的办法来验证连接有效性,可以直接从源码中找一下响应的方法,如下:

    /** 
         * <p>Sets the {@link #validationQuery}.</p>
         * <p>
         * Note: this method currently has no effect once the pool has been
         * initialized.  The pool is initialized the first time one of the
         * following methods is invoked: <code>getConnection, setLogwriter,
         * setLoginTimeout, getLoginTimeout, getLogWriter.</code></p>
         * 
         * @param validationQuery the new value for the validation query
         */
        public void setValidationQuery(String validationQuery) {
            if ((validationQuery != null) && (validationQuery.trim().length() > 0)) {
                this.validationQuery = validationQuery;
            } else {
                this.validationQuery = null;
            }
            this.restartNeeded = true;
        }

     /**
         * The SQL query that will be used to validate connections from this pool
         * before returning them to the caller.  If specified, this query
         * <strong>MUST</strong> be an SQL SELECT statement that returns at least
         * one row.
         */
        protected volatile String validationQuery = null;

    /**
         * The indication of whether objects will be validated before being
         * borrowed from the pool.  If the object fails to validate, it will be
         * dropped from the pool, and we will attempt to borrow another.
         */
        protected boolean testOnBorrow = true;

    上面的意思是这样的,当从数据库连接池中获取连接的时候,会先验证连接的有效性,如果失败了的话,会继续请求另外的一个连接,所以,dbcp的配置修改为如下的配置:

    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
    	<property name="driverClassName" value="${jdbc.driverClass}" />
    	<property name="url" value="${jdbc.url}" />
    	<property name="username" value="${jdbc.username}" />
    	<property name="password" value="${jdbc.password}" />
    	<property name="validationQuery" value="select 1"></property>
    	<property name="testOnBorrow" value="true"></property>
    </bean>

    这样,将网站的所有配置都更新掉就可以了。

    展开全文
  • 那些搞不懂的数据库连接异常

    万次阅读 热门讨论 2018-09-14 10:31:00
    Caused by: java.sql.SQLTransientConnectionException: HikariPool-1 - Connection is not available,...原因:请求数据库连接时长时间未获取到时,会报这个错误 修改配置项:datasource.primary.connection-timeo...

    Caused by: java.sql.SQLTransientConnectionException: HikariPool-1 - Connection is not available, request timed out after 30010ms.

    原因:请求数据库连接时长时间未获取到时,会报这个错误
    修改配置项:datasource.primary.connection-timeout=30000

    Cause: com.mysql.jdbc.exceptions.MySQLTimeoutException: Statement cancelled due to timeout or client request

    原因:脚本执行时间太长,客户端自动断开
    修改配置项:mybatis.configuration.default-statement-timeout=30

    com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Connection.close() has already been called. Invalid operation in this state.

    原因:数据库端关闭了连接
    修改数据项:数据库配置wait_timeout

    org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is java.sql.SQLException: HikariDataSource HikariDataSource (HikariPool-1) has been closed.

    原因:服务正在重启,导致部分连接失效

    相关:https://blog.csdn.net/superdangbo/article/details/78744774

    展开全文
  • 在Yarn后台查看了Job日志后报出的该问题,当时分析有以下几个方面的原因: 数据库驱动jar版本过低 数据库安装之后默认最大连接数太少 Spark代码中配置的数据库连接池初始化连接数量过少 Spark代码中获取的数据库连接...
  • spring+mybatis的项目,数据库没有自己操作连接,事务也由spring管理,启动后连接池大概占 12个左右,但是关闭服务后总有连接未释放 select username,machine,count(username) from v$session where username is not...
  • python 异常处理,重新连接数据库的异常处理,针对处理重启数据库的情况下,会造成原来的连接失效,从而导致无法连接数据库而引发其他异常的问题出现,工作原理是:在操作...2,查询数据库的时候数据库连接了解一下...
  • 使用数据库操作时出现出现错误,销毁长时间未使用的连接,并显示了无使用的时间ms数。 ERROR 16858 --- [nio-8555-exec-1] c.a.druid.pool.DruidAbstractDataSource : discard long time none received connection...
  • esb的console中部署时报数据库连接异常,信息如下:[governor][2016-08-22 11:41:22,106][INFO ][AbstractPhaseHandler:78] Target:mygroups 127.0.0.1:7400(mysever) deployed failed!Exception message:'[错误] ...
  • Oracle 连接及其部分连接异常处理.
  • java 连接数据库时发生的一些异常

    千次阅读 2018-07-10 20:55:51
    第一次写博客 如果有不足之处请多指教 相信大家在用java连接数据库数据库进行更新查询的时候会遇到很多异常, 今天我们就来盘点一下java当中连接数据库时经常遇到的一些异常1. 异常:java.sql.SQLException: ...
  • Java连接MYSQL数据库异常

    千次阅读 2018-08-02 21:52:39
    一个最基本的Java连接MySQL8.0.11数据库demo,无法正常连接数据库,报错如下:   java.sql.SQLException: Access denied for user 'root'@'localhost' (using password: YES) at ...
  • 数据库连接异常 (A ResourcePool could not acquire a resource from its primary factory or source.) 生为小白的我总结以下五种常见发生这种异常信息的类型,先检查数据库是否启动了,不过MySQL数据库一般都会...
  • java.sql.SQLException: Unknown error 1045 异常排查: 1.数据库连接地址 2.数据库登录名 3.数据库登录密码
  • } catch ... System.out.println("数据库访问异常!"); thrownew RuntimeException(e); 如上所写thrownew RuntimeException(e);这样写是什么意思?为什么要写这句!写这句的作用是什么?
  • JDBC是Java数据连接技术(Java Database Connection)的简称,提供连接各种常用数据库的能力。 •JDBC驱动由数据库厂商提供 –在个人开发与测试中,可以使用JDBC-ODBC桥连方式 –在生产型开发中,推荐使用纯Java...
  • 多线程就带来了高并发,短时间内大量的请求发向数据库,在运行过程中出现了以下错误:** BEGIN NESTED EXCEPTION ** com.mysql.jdbc.CommunicationsException MESSAGE: Communications link failure due to ...
  • 连接数据库时常见异常错误

    千次阅读 2018-05-27 19:36:44
    连接数据库时,URL 里内含乾坤呀 如 db.url = jdbc:mysql://localhost:3306/picture? 解析: jdbc:mysql 协议 localhost IP 3306 端口 picture 数据库名 ?后面也能帮我们解决很多常见异常 ...
  • C# 连接数据库异常捕获

    千次阅读 2013-08-20 14:40:16
    连接数据库的异常捕获 try {  table=ExecuteDataTable="Select TABLE_NAME from INFORMATION_SCHEMA.TABLE where TABLE_TYPE='BASE TABLE'";... Message.Show("数据库连接错误,错误源是"+sqle
  • # 获取数据库连接 db = self.getConnect() #使用cursor() 方法创建一个游标对象 cursor cursor = db.cursor() # 使用execute()方法执行sql ,如果表存在则删除 cursor.execute("drop table if exists %s" %...
  • eclipse 用JDBC连接mysql数据库时出现异常第一个异常第二个异常完整测试例子 第一个异常 Loading class com.mysql.jdbc.Driver'. This is deprecated. The new driver class iscom.mysql.cj.jdbc.Driver’. The ...
  • 最近在处理公司出差对商旅接口的事,将程序打成JAR包后,在本地运行无误,但是上传到服务器以后报数据库异常错误。 项目使用axis2调用webservice。在cmd里巡行bat文件具体错误如下图:![图片说明]...
  • eclipse开发之数据库连接--连接失败

    千次阅读 2020-05-04 08:23:34
    查看自己的Web APP Libraries下面是不是有多余的包,我就是MySQL的包有两个不同版本的,删除之后就好了。
  • Mysql连接数据库异常汇总【必收藏】

    千次阅读 2020-03-22 09:34:24
    于是花了两个小时搜了各种数据库连接异常导致的原因,最终问题得以解决。同时,把解决过程中搜集到的异常信息汇总一下,当大家遇到类似的问题时,给大家以思路。必须珍藏。 问题现象 先来说说我遇到的问题。项目中...

空空如也

空空如也

1 2 3 4 5 ... 20
收藏数 382,824
精华内容 153,129
关键字:

数据库连接异常