c3p0

C3P0

◇◆丶佛笑我妖孽 提交于 2019-12-18 04:22:25
jar包准备 获取数据库连接对象Connection的方法一 public void test ( ) throws Exception { ComboPooledDataSource cpds = new ComboPooledDataSource ( ) ; cpds . setDriverClass ( "com.mysql.cj.jdbc.Driver" ) ; cpds . setUser ( "root" ) ; cpds . setPassword ( "root" ) ; cpds . setJdbcUrl ( "jdbc:mysql://localhost:3306/test?serverTimezone=UTC" ) ; cpds . setInitialPoolSize ( 10 ) ; Connection conn = cpds . getConnection ( ) ; System . out . println ( conn ) ; } 获取数据库连接对象Connection的方法二 配置c3p0-config.xml < c3p0 - config > < named - config name = "helloc3p0" > < ! -- 提供 4 个基本信息 -- > < property name = "driverClass" > com

Can I access the c3P0 connection pool properties programmatically?

本秂侑毒 提交于 2019-12-13 12:41:18
问题 I am worried that the properties I have set for my C3P0 connection pool are not being used correctly. Is there a way I can access the values that are set while the application is running and print them out: Println("Minimum connections"+connectionNumers.minimum); Thanks 回答1: You can use log4j to output debug information like so: log4j.logger.com.mchange=DEBUG, STDOUT ### direct log messages to stdout ### log4j.appender.STDOUT=org.apache.log4j.ConsoleAppender log4j.appender.STDOUT.Target

SpringIoC和DI注解开发

牧云@^-^@ 提交于 2019-12-13 09:27:27
1.Spring配置数据源 1.1 数据源(连接池)的作用 数据源(连接池)是提高程序性能如出现的 事先实例化数据源,初始化部分连接资源 使用连接资源时从数据源中获取 使用完毕后将连接资源归还给数据源 常见的数据源(连接池):DBCP、C3P0、BoneCP、Druid等 开发步骤 ①导入数据源的坐标和数据库驱动坐标 ②创建数据源对象 ③设置数据源的基本连接数据 ④使用数据源获取连接资源和归还连接资源 1.2 数据源的手动创建 ①导入c3p0和druid的坐标 <!-- C3P0连接池 --> < dependency > < groupId > c3p0 </ groupId > < artifactId > c3p0 </ artifactId > < version > 0.9.1.2 </ version > </ dependency > <!-- Druid连接池 --> < dependency > < groupId > com.alibaba </ groupId > < artifactId > druid </ artifactId > < version > 1.1.10 </ version > </ dependency > ①导入mysql数据库驱动坐标 <!-- mysql驱动 --> < dependency > < groupId > mysql

choose a db connection pool

流过昼夜 提交于 2019-12-13 05:19:41
问题 we want to use a db connection pool in our applicationl,however thear are so many open soure pools,like dbcp,c3p0,proxool and etc. I have no idea which is better,any one have some experience about them? 回答1: I'd recommend using the one that is built into your Java EE app server if you're using one. That's should be sufficient. Why add another dependency? I'd recommend using DBCP from Apache. It'll work just fine for your purposes. 回答2: As author of BoneCP (http://jolbox.com), I invite you to

Partial commit when Connection close in Oracle with Hibernate/JPA

自作多情 提交于 2019-12-13 03:44:13
问题 Recently got this following error in my application JPA/Hibernate with database Oracle RAC 11g. This error occurred when our storage was full and DBA needed close connections, kill active sessions, or some like this "Connection closed" (now I can know what happened, he was fired....) javax.persistence.RollbackException: Error while commiting the transaction at org.hibernate.ejb.TransactionImpl.commit(TransactionImpl.java:71) at com.cgmp.ValePedagioSite.comprarViagemPorPlaca(ValePedagioSite

Why do I get a CannotAcquireResourceException while trying to connect, when I extend AbstractComboPooledDataSource?

坚强是说给别人听的谎言 提交于 2019-12-13 03:39:31
问题 In a Tomcat 8.5.15 environment using an Oracle 11 database, I want to implement a data source that handles encrypted passwords in the context.xml . For example, instead of having: <Resource auth="Container" description="MyDataSource" driverClass="oracle.jdbc.OracleDriver" maxPoolSize="100" minPoolSize="10" acquireIncrement="1" name="jdbc/MyDataSource" user="me" password="mypassword" factory="org.apache.naming.factory.BeanFactory" type="com.mchange.v2.c3p0.ComboPooledDataSource" jdbcUrl="jdbc

Where to put c3p0 dependency in Tomcat Container

孤街浪徒 提交于 2019-12-13 00:48:36
问题 I was under the impression that the libraries for both the database driver ( postgres-x.x.jar 'in my case) and the connection pooler ( c3p0 ) had to reside in the container's lib (e.g. for Tomcat7, $CATALINA_HOME/lib ). However, the official C3p0 documentation doesn't provide any information with regards to put the connection pool's jar in the container vs having it in the application's war: Place the files lib/c3p0-0.9.5.2.jar and lib/mchange-commons-java-0.2.11.jar somewhere in your

How to handle database connection fail with Hibernate, C3P0 on Java EE?

♀尐吖头ヾ 提交于 2019-12-13 00:35:31
问题 I am working on Java EE JSF application using Hibernate with C3P0 connection pool. I have tried to search anything possible and impossible and tried many things, but couldnt figure this out. The problem is handling database connection fail, for example when database is shut down. I couldn't find a way how to catch ecfeption which I could use to show error status on user interface. The only thing I could do is see some exceptions in console: com.mysql.jdbc.exceptions.jdbc4

Spring框架(3)--Spring配置数据源

此生再无相见时 提交于 2019-12-12 21:04:23
常见的数据源(链接池)有:DBCP、C3P0、Druid等等。 以C3P0数据源(C3P0连接池)为例,演示Spring对“非自定义对象”的配置。 Spring配置C3P0链接池的步骤: 1.导入数据源的坐标和数据库的驱动坐标 1 <!-- C3P0连接池 --> 2 <dependency> 3 <groupId>c3p0</groupId> 4 <artifactId>c3p0</artifactId> 5 <version>0.9.1.2</version> 6 </dependency> 7 8 <!-- mysql驱动 --> 9 <dependency> 10 <groupId>mysql</groupId> 11 <artifactId>mysql-connector-java</artifactId> 12 <version>5.1.39</version> 13 </dependency> 2.设置数据源的基本链接数据 分为手动创建C3P0链接池和使用Spring配置C3P0链接池:   使用Spring配置:在核心配置文件中配置如下: 1 <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"> 2 <property name="driverClass" value=

hibernate + apache tomcat + JDBCconnection timeout excpetion broken pipe

谁说胖子不能爱 提交于 2019-12-12 19:44:12
问题 *My application is running on tomcat 6 along with hibernate3 and mysql version is 5.x, i am getting an exception of JDBC connection lost after wait_timeout in mysql, all my jsp pages will be pass through the Filters I am using tomcat clustering with apache in front. Running my crons separately using quartz database.* Below is my exception stacktrace..... . Caused by: com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying exception: ** BEGIN NESTED EXCEPTION **