c3p0

c3p0-config.xml

佐手、 提交于 2019-12-30 19:53:11
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> c3p0-config.xml <?xml version="1.0" encoding="UTF-8"?> <c3p0-config> <named-config name="mvcapp"> <property name="user">root</property> <property name="password">123456</property> <property name="driverClass">com.mysql.cj.jdbc.Driver</property> <property name="jdbcUrl">jdbc:mysql:///atguigu?serverTimezone=GMT%2B8&characterEncoding=utf8&useSSL=false</property> <property name="acquireIncrement">5</property> <property name="initialPoolSize">10</property> <property name="minPoolSize">10</property> <property name="maxPoolSize">50</property> <property name=

java.net.SocketException: Software caused connection abort: socket write error

风流意气都作罢 提交于 2019-12-30 05:26:33
我使用的框架是Struts2+Hibernate3+Spring,项目的后台数据库是Mysql,最近挪到正式服务器上了,处于一直打开服务的状态,就出现了java.net.SocketException: Software causedconnection abort: socket write error 这个异常。每次白天重启后能够正常访问,晚上没有人访问后,第二天早上再访问就报了这个错误。 在网上google了一下,都说是因为Mysql服务器默认的“wait_timeout”是8小时,也就是说一个connection空闲如果超过8个小时,Mysql将自动断开该connection。这样就出现了上面这个问题。 网上的解决方法有几种: 第一种:在mysql安装目录下找到my.ini文件中添加超时限制:在该文件最后添加一行:wait_timeout=2880000。这样把之前的超时限制把8小时(28800)扩大为20天(20*24*60*60=1728000)。这样重启了mysql后,再在其中输入命令: show global variables like "wait_timeout"; ,查看超时是否已修改为:1728000。实际操作中,我修改的是C:\WINDOWS目录下的my.ini,这是我的Mysql数据库所使用的描述文件,在该文件的 [mysqld] 一节中,添加了

Does c3p0 connection pooling ensures max pool size?

放肆的年华 提交于 2019-12-30 04:45:09
问题 I've gone through several question, this is somewhat related but doesn't answer my question. Does the c3p0 connection pooling maxPoolSize ensures that the number of connections at a certain time never exceeds this limit? What if the maxPoolSize=5 and 10 users start using the app exactly at the same time? My app. configurations <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close"> <property name="driverClass"><value>${database.driverClassName}</value>

了解一下连接池!!!!

泄露秘密 提交于 2019-12-30 00:14:56
为什么会出现连接池呢?? 你想过没?   好吧。原因就是因为因为在还没有连接池这个概念之前,就没有一个统一的标准,这时候每个互联网公司就都有自己的标准,所以他们生产自己的jar包,自己做自己的标准。   后来懂吧,总会有一个人站出来,没错那个人不是我,唉!!   就是sun公司啦!   定义了一个规范的标准  (连接池的规范接口 javax.sql.DataSource, 连接池对象 DataSource,   增删改查 prepareStatement, 连接 Connection 等接口)   拿来就用主义开始发扬光大!   目前呢,主流的连接池有   dbcp 和 c3p0      对了,连接池的主要作用是为了提高性能,而不是为了创建与数据库的连接   那连接池是通过什么方法来提高性能的呢,而且这个性能又是只哪里的?   ---------------------------------------------------------------------------------------------------   不知道你们写没写过jdbc的数据库连接          我们知道,我上面这张图片是只有updata操作的   当我们想要执行其他操作的时候,我们得重新写一遍其他操作的代码   那就让我们来看看这段代码写的是什么吧    这一句是sql语句嘛,大家都懂  

C3P0 apparent deadlock when the threads are all empty?

北战南征 提交于 2019-12-29 03:52:08
问题 I'm using C3P0 as a connection pool in Tomcat, and I'm seeing very worrying errors: 2010-09-16 13:25:00,160 [Timer-0] WARN com.mchange.v2.async.ThreadPoolAsynchronousRunner - com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector@43502400 -- APPARENT DEADLOCK!!! Creating emergency threads for unassigned pending tasks! 2010-09-16 13:25:01,407 [Timer-0] WARN com.mchange.v2.async.ThreadPoolAsynchronousRunner - com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector

Hibernate, C3P0, Mysql — Broken Pipe

Deadly 提交于 2019-12-28 11:54:50
问题 MySQL seems to have an 8 hour time out on its connections. I'm running multiple WARs in Tomcat utilizing Hibernate for ORM. After 8 hours (i.e. overnight), I get broken pipes when it picks up an idle connection. I've already traced through the code and made doubly sure I commit or rollback all transactions. Here is my hibernate.cfg.xml <?xml version="1.0" encoding="utf-8"?> <!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate

Configuring the built-in c3p0 pooling in Hibernate using Spring

☆樱花仙子☆ 提交于 2019-12-28 05:29:39
问题 I learned that to configure c3p0 pooling in hibernate, we can have write the configuration in hibernate.cfg.xml such this: <property name="hibernate.c3p0.min_size">2</property> <property name="hibernate.c3p0.max_size">5</property> <property name="hibernate.c3p0.timeout">600</property> <property name="hibernate.c3p0.max_statements">0</property> <property name="hibernate.c3p0.idle_test_period">300</property> <property name="hibernate.c3p0.acquire_increment">1</property> However I configured

解决Method com/mchange/v2/c3p0/impl/NewProxyPreparedStatement.isClosed()Z is abstract

江枫思渺然 提交于 2019-12-27 05:15:18
ssm中测试时报错 Method com/mchange/v2/c3p0/impl/NewProxyPreparedStatement.isClosed()Z is abstract 问题原因是c3p0版本过低,可以使用0.9.5.2以上 来源: CSDN 作者: uvw. 链接: https://blog.csdn.net/GUYyyy/article/details/103722069

异常错误-Could not load driverClass com.microsoft.sqlserver.jdbc.SQLServerDriver异常

我是研究僧i 提交于 2019-12-27 01:20:35
条件 数据库:sqlserver2017; IDE:IDEA2017; 连接池:c3p0; 现象: 在启动tomcat时顺利进入启动页面,当开始进行登录或者有需要通过jdbc操作数据库时将报如下异常,并循环出现(说明页面请求不断的向jdbc发送但是就是找不到对应的入口)。 26-Dec-2019 17:21:30.868 [http-nio-8080-exec-10] com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.getPoolManager Initializing c3p0 pool... com.mchange.v2.c3p0.ComboPooledDataSource [ acquireIncrement -> 3, acquireRetryAttempts -> 30, acquireRetryDelay -> 1000, autoCommitOnClose -> false, automaticTestTable -> null, breakAfterAcquireFailure -> false, checkoutTimeout -> 0, connectionCustomizerClassName -> null, connectionTesterClassName -> com.mchange.v2

c3p0配置

穿精又带淫゛_ 提交于 2019-12-26 05:28:01
1.c3p0配置文件 <?xml version="1.0" encoding="UTF-8"?> <c3p0-config> <!-- This is default config! --> <default-config> <property name="initialPoolSize">10</property> <property name="maxIdleTime">30</property> <property name="maxPoolSize">100</property> <property name="minPoolSize">10</property> <property name="maxStatements">200</property> </default-config> <!-- This is my config for mysql--> <named-config name="mysql"> <property name="driverClass">com.mysql.jdbc.Driver</property> <property name="jdbcUrl">jdbc:mysql://localhost:3306/jdbc?useUnicode=true&characterEncoding=UTF8</property> <property