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severalgroupnumber,thenwithb±a,=c,-2~3measurement,suchasproceedsofcvaluesareequalandequaltothedesignvalue,,b,andcvalueswhileonhorizontalverticalerrorsformeasurement,Generalinironanglecodebitatmeasurementlevelpointsgriderrors,specificmethodisfrombaselinetomethylverticalboxcenterlinedistancefora,,tobverticalboxdistanceforb,listcanmeasured
severalgroupnumber,thenwithb±a,=c,-2~3measurement,suchasproceedsofcvaluesareequalandequaltothedesignvalue,,b,andcvalueswhileonhorizontalverticalerrorsformeasurement,Generalinironanglecodebitatmeasurementlevelpointsgriderrors,specificmethodisfrombaselinetomethylverticalboxcenterlinedistancefora,,tobverticalboxdistanceforb,listcanmeasured
关于MySQL的wait_timeout连接超时问题报错解决方案
Mysql效劳器默认的“wait_timeout〞是8小时【也就是默认的值默认是28800秒】,也就是说一个connection空闲超过8个小时,Mysql将自动断开该connection,通俗的讲就是一个连接在8小时内没有活动,就会自动断开该连接。
waittimeout的值可以设定,但最多只能是2147483,不能再大了。
#TheTCP/IPPorttheMySQLServerwilllistenon
port=3306下面添加
#thisismyowndinifitionformysqlconnectiontimeout
wait_timeout=31536000
interactive_timeout=31536000
无论超过最大限度多大的数值,只能被MySQL解析为2147483,2147483天后你的程序该出什么错还是什么错,防止不了的
在说这个错误之前先说明我的工程是通过Hibernate来进行数据库操作的
关于MySQL连接超时问题,估计很多人都遇到过:大致情形都是这样,开发测试时程序都是正常的,一到第二天就出先莫名错误,比方在我的工程中就是定时任务执行,每天凌晨一点执行一次,也就是24小时每隔24小时执行,远远超出了8小时
如果你刚好在数据库超时的第一时间内看到日志记录的话那么,第一次超时发生的错误就是这样的:
ERROR[]-Communicationslinkfailure
Lastpacketsenttotheserverwas0msago.
如果不是第一次超时后执行,以后每次报错就变成嵌套的错误了,就是下面这样:
ERROR[]-
 :
 
**BEGINNESTEDEXCEPTION**
MESSAGE:,which islongerthantheserverconfiguredvalueof'wait_timeout'.Youshouldconsidereitherexpiringand/ortestingconnectionvaliditybeforeuseinyourapplication,increasingtheserverconfiguredvaluesforclienttimeouts,orusingtheConnector/Jconnectionproperty'autoReconnect=true'toavoidthisproblem.
STACKTRACE:
severalgroupnumber,thenwithb±a,=c,-2~3measurement,suchasproceedsofcvaluesareequalandequaltothedesignvalue,,b,andcvalueswhileonhorizontalverticalerrorsformeasurement,Generalinironanglecodebitatmeasurementlevelpointsgriderrors,specificmethodisfrombaselinetomethylverticalboxcenterlinedistancefora,,tobverticalboxdistanceforb,listcanmeasured
severalgroupnumber,thenwithb±a,=c,-2~3measurement,suchasproceedsofcvaluesareequalandequaltothedesignvalue,,b,andcvalueswhileonhorizontalverticalerrorsformeasurement,Generalinironanglecodebitatmeasurementlevelpointsgriderrors,specificmethodisfrombaselinetomethylverticalboxcenterlinedistancefora,,tobverticalboxdistanceforb,listcanmeasured
severalgroupnumber,thenwithb±a,=c,-2~3measurement,suchasproceedsofcvaluesareequalandequaltothedesignvalue,,b,andcvalueswhileonhorizontalverticalerrorsformeasurement,Generalinironanglecodebitatmeasurementlevelpointsgriderrors,specificmethodisfrombaselinetomethylverticalboxcenterlinedistancefora,,tobverticalboxdistanceforb,listcanmeasured
:,which islongerthantheserverconfiguredvalueof'wait_timeout'.Youshouldconsidereitherexpiringand/ortestingconnectionvaliditybeforeuseinyourapplication,increasingtheserverconfiguredvaluesforclienttimeouts,orusingtheConnector/Jconnectionproperty'autoReconnect=true'toavoidthisproblem.
 (NativeMethod)
 (UnknownSource)
 (UnknownSource)
 (UnknownSource)
 (:406)
 (:1074)
 (:3270)
 (:1932)
 (:2101)
 (:2554)
 (:1761)
 (:1912)
 (:208)
 (:1812)
 (:697)
 (:259)
 (:2232)
 (:2129)
 (:2124)
 (:401)
 (:363)
 (:196)
 (:1149)
 (:102)
 (:835)
 (:23)
 (:324)
 (:41)
 (:76)
 (:199)
 $(:549)
Causedby::Softwarecausedconnectionabort:socketwriteerror
 (NativeMethod)
 (UnknownSource)
 (UnknownSource)
 (UnknownSource)
 (UnknownSource)
 (:3251)
 ...24more
severalgroupnumber,thenwithb±a,=c,-2~3measurement,suchasproceedsofcvaluesareequalandequaltothedesignvalue,,b,andcvalueswhileonhorizontalverticalerrorsformeasurement,Generalinironanglecodebitatmeasurementlevelpointsgriderrors,specificmethodisfrombaselinetomethylverticalboxcenterlinedistancefora,,tobverticalboxdistanceforb,listcanmeasured
severalgroupnumber,thenwithb±a,=c,-2~3measurement,suchasproceedsofcvaluesareequalandequaltothedesignvalue,,b,andcvalueswhileonhorizontalverticalerrorsformeasurement,Generalinironanglecodebitatmeasurementlevelpointsgriderrors,specificmethodisfrombaselinetomethylverticalboxcenterlinedistancefora,,tobverticalboxdistanceforb,listcanmeasured
severalgroupnumber,thenwithb±a,=c,-2~3measurement,suchasproceedsofcvaluesareequalandequaltothedesignvalue,,b,andcvalueswhileonhorizontalverticalerrorsformeasurement,Generalinironanglecodebitatmeasurementlevelpointsgriderrors,specificmethodisfrombaselinetomethylverticalboxcenterlinedistancefora,,tobverticalboxdistanceforb,listcanmeasured
**ENDNESTEDEXCEPTION**
具体解释是这样的:Mysql效劳器默认的“wait_timeout〞是8小时【也就是默认的值默认是28800秒】,也就是说一个connection空闲超过8个小时,Mysql将自动断开该connection,通俗的讲就是一个连接在8小时内没有活动,就会自动断开该连接。
waittimeout的值可以设定,但最多只能是2147483,不能再大了。
#TheTCP/IPPorttheMySQLServerwilllistenon
port=3306下面添加
#thisismyowndinifitionformysqlconnectiontimeout
wait_timeout=31536000
interactive_timeout=31536000
无论超过最大限度多大的数值,只能被MySQL解析为2147483,2147483天后你的程序该出什么错还是什么错,防止不了的
后来发现Hibernate的内置连接池性能是非常的差,还不如直接用第三方的c3p0,改用C3P0连接池,这
severalgroupnumber,thenwithb±a,=c,-2~3measurement,suchasproceedsofcvaluesareequalandequaltothedesignvalue,,b,andcvalueswhileonhorizontalverticalerrorsformeasurement,Generalinironanglecodebitatmeasurementlevelpointsgriderrors,specificmethodisfrombaselinetomethylverticalboxcenterlinedistancefora,,tobverticalboxdistanceforb,listcanmeasured
severalgroupnumber,thenwithb±a,=c,-2~3measurement,suchasproceedsofcvaluesareequalandequaltothedesignvalue,,b,andcvalueswhileonhorizontalverticalerrorsformeasurement,Generalinironanglecodebitatmeasurementlevelpointsgriderrors,specificmethodisfrombaselinetomethylverticalboxcenterlinedistancefora,,tobverticalboxdistanceforb,listcanmeasured
severalgroupnumber,thenwithb±a,=c,-2~3measurement,suchasproceedsofcvaluesareequalandequaltothedesignvalue,,b,andcvalueswhileonhorizontalverticalerrorsformeasurement,Generalinironanglecodebitatmeasurementlevelpointsgriderrors,specificmethodisfrombaselinetomethylverticalboxcenterlinedistancefora,,tobverticalboxdistanceforb,listcanmeasured
个连接池会自动处理数据库连接被关闭的情况。要使用C3P0很简单,先从Hibernate里把c3p0-
制到工程的lib目录中,〔使用缺
省值或自己需要的数值〕,这样Hibernate就会自动使用C3P0代替内置的连接池了。到目前为止前面的问题
没有再出现过。
 
Xml代码 
<SPAN style="FONT-SIZE: medium"><property name=""></property>  
        <!--连接池的最小连接数-->   
        <property name="">5</property>  
        <!--最大连接数-->   
        <property name="">30</property>  
        <!--连接超时时间-->  
        <property name="">1800</property>  
        <!--statemnets缓存大小-->   
        <property name="">100</property>  
        <!--每隔多少秒检测连接是否可正常使用  -->   
        <property name="">121</property>  
        <!--当池中的连接耗尽的时候,一次性增加的连接数量,默认为3-->   
        <property name="">1</property>  
        <property name="">true</property></SPAN>  
severalgroupnumber,thenwithb±a,=c,-2~3measurement,suchasproceedsofcvaluesareequalandequaltothedesignvalue,,b,andcvalueswhileonhorizontalverticalerrorsformeasurement,Generalinironanglecodebitatmeasurementlevelpointsgriderrors,specificmethodisfrombaselinetomethylverticalboxcenterlinedistancefora,,tobverticalboxdistanceforb,listcanmeasured
severalgroupnumber,thenwithb±a,=c,-2~3measurement,suchasproceedsofcvaluesareequalandequaltothedesignvalue,thentheverticalinstallationaccurate