c3p0 | 易学教程

Asking c3p0 how many connections are in use

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问题 Is there a way to programatically ask c3p0 how many of it's connections are being used, or perhaps logs when the pool is exhausted. 回答1: As indicated in the URL referenced by Austin's comment above, you can use JMX to inspect and modify running c3p0 PooledDataSources. You can also do so programmatically. c3p0's PooledDataSources have an elaborate API for inspecting their state: http://www.mchange.com/projects/c3p0/apidocs/com/mchange/v2/c3p0/PooledDataSource.html If you are using

Whats the best way to set the values of C3P0 parameters when it is in conjunction with Hibernate? [closed]

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问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 5 years ago . First of all please note: question is about values of parameters not methods of configuration. Also, my question is customized to my system requirement. My system is going to be used by 20 concurrent users who make requests, and I believe max time that each query would be

Eclipselink Pooling equivalent to C3PO

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问题 I am trying to prevent this logging The last packet successfully received from the server was 10,255 milliseconds ago. The last packet sent successfully to the server was 0 milliseconds ago. I already set the the connection url with auto reconnect in the persistence.xml What I want is that there will be a connection pool, check the connection every minute or hour so the connection is still alive. The Hibernate has this feature with c3po. like the ff. <property name="hibernate.c3p0.timeout"

CLIENT STACK TRACE in Hibernate using c3p0

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问题 This may be a duplicate of Weird Error: CLOSE BY CLIENT STACK TRACE But I've asked a new question because I don't see isLoggable method for Log. I'm using Logger class of org.apache.log4j.Logger for my log purpose. My error is same java.lang.Exception: DEBUG -- CLOSE BY CLIENT STACK TRACE at com.mchange.v2.c3p0.impl.NewPooledConnection.close(NewPooledConnection.java:566) at com.mchange.v2.c3p0.impl.NewPooledConnection.close(NewPooledConnection.java:234) at com.mchange.v2.c3p0.impl

c3p0 pool is not shrinking

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问题 I am using c3p0 connection pool with Spring (with plain jdbc, no hibernate). Here is my configuration for pool <bean id="myDataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close"> <property name="driverClass" value="${jdbc.driver}"/> <property name="jdbcUrl" value="${jdbc.url}"/> <property name="user" value="${jdbc.username}"/> <property name="password" value="${jdbc.password}"/> <property name="acquireIncrement" value="3"/> <property name="minPoolSize" value="3"/

Getting Exception and application not able to connect with MySqL Database when using connection pooling (c3p0-0.9.1.2) with Hibernate 3.2?

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I am using connection pooling (c3p0-0.9.1.2) with Hibernate 3.2 like this: hibernate.cfg.xml <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property> <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property> <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/bspersonaltrainer</property> <property name="hibernate.connection.username">root</property> <property name="hibernate.connection.password">admin</property> <property name="hibernate.current_session_context_class">thread</property> <property name="hibernate.cache.provider

数据库连接池C3P0学习

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c3p0的配置方式分为三种，分别是 1.setters一个个地设置各个配置项 2.类路径下提供一个c3p0.properties文件 3.类路径下提供一个c3p0-config.xml文件 1.setters一个个地设置各个配置项这种方式最繁琐，形式一般是这样： 01 Properties props = new Properties(); 02 InputStream in = ConnectionManager.class.getResourceAsStream("/c3p0.properties"); 03 props.load(in); 04 in.close(); 05 06 ComboPooledDataSource cpds = new ComboPooledDataSource(); 07 cpds.setDriverClass(props.getProperty("driverClass")); 08 cpds.setJdbcUrl(props.getProperty("jdbcUrl")); 09 cpds.setUser(props.getProperty("user")); 10 cpds.setPassword(props.getProperty("password")); 因为繁琐，所以很不适合采用，于是文档提供了另外另种方式。 2.

Is c3p0 connection pool is required with hibernate in JBoss AS 7

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问题 My project is in the beginning stage and I am having a big issue with hibernate. I am using hibernate 4.1.8-Final with c3p0 0.9.1.2. I have the following entity class: @javax.persistence.Entity @Table(name = "CUSTOMER") public class Customer extends Entity { @Transient private static final long serialVersionUID = 3326144323537452197L; private String customerId; private String customerName; private boolean active; public Customer() { super(); } @NaturalId @Column(name = "CUSTOMER_ID", nullable

Play! Framework 1.2.4 — C3P0 settings to avoid Communications link failure do to idle time

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问题 I'm trying to customize my C3P0 settings to avoid the error shown at the bottom of this post. It was suggested at this url --- http://make-it-open.blogspot.com/2008/12/sql-error-0-sqlstate-08s01.html --- to adjust the settings as follows: In hibernate.cfg.xml, write <property name="c3p0.min_size">5</property> <property name="c3p0.max_size">20</property> <property name="c3p0.timeout">1800</property> <property name="c3p0.max_statements">50</property> Then create "c3p0.properties" in your root

Connection hanging occasionally with Amazon RDS MySQL & Play Framework 1.2.5 (c3p0 default settings)

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问题 We're having problems with Amazon-hosted Play application with RDS Mysql. Sometimes the application ends up unresponsive. Today I checked the thread status with jstack -F and there were multiple threads stuck in native code for c3p0 connection : Thread 14060: (state = IN_NATIVE) - java.net.SocketInputStream.socketRead0(java.io.FileDescriptor, byte[], int, int, int) @bci=0 (Compiled frame; information may be imprecise) - java.net.SocketInputStream.read(byte[], int, int, int) @bci=79, line=150