c3p0 | 易学教程

What are the required C3P0 settings for hibernate in order to avoid Deadlocks

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I use Hibernate together with MySQL 5.1.30. I have the next libraries: c3p0-0.0.1.2.jar mysql-connector-java-5.0.3-bin.jar hibernate3.jar I use a hibernate.cfg.xml for configuration: <!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> <hibernate-configuration> <session-factory>  <property name="connection.driver_class">org.gjt.mm.mysql.Driver</property> <property name="connection.url">jdbc:mysql://localhost/fooDatatbase</property> <property name=

Not able to set spring.datasource.type

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问题 I'm trying to setup c3p0 on my spring boot server. This is my config right now spring.datasource.url=jdbc:mysql://url/db spring.datasource.username=username spring.datasource.password=password spring.datasource.driver-class-name=com.mysql.jdbc.Driver spring.datasource.test-on-borrow=true #spring.datasource.test-while-idle=true spring.datasource.validation-query=SELECT 1 #spring.datasource.time-between-eviction-runs-millis=10000 #spring.datasource.min-evictable-idle-time-millis=30000 spring

How can I prevent Hibernate + c3p0 + MySql creating large numbers of sleeping connections?

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问题 I'm using GWT with Hibernate, c3p0 and MySQL to produce a web app with a limited audience (max 50 users per day). During testing I found that Hibernate was opening a connection with each session but not closing it, irrespective of use of the close() method. My current configuration is as follows: hibernate.connection.driver_class=com.mysql.jdbc.Driver hibernate.connection.url= hibernate.connection.username= hibernate.connection.password= hibernate.dialect=org.hibernate.dialect.MySQLDialect

Hibernate/MySQL Connection Timeout

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问题 I wrote a server-side application that powers a website and multiple mobile clients. I used Hibernate for data access. I later discovered that the app fails after a day! When I checked around online, I found out that its a well know issue with MySQL terminating a "stale" connection after 8 hours. In order to avoid this, I found many suggestions like including ?autoReconnect=true , using c3P0 , etc. Since autoReconnect is officially discouraged (especially in production environment) and also

Hibernate encodes wrong while persisting objects [UTF-8]

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问题 I'm facing with UTF-8 encoding problem while persisting my model objects. In Turkish ' ı ' is a letter. Also there're some other Turkish characters that is included in UTF-8 encoding. While I persist my model objects, all ' ı ' characters are persisted as ' ? ' to DB. I'm using MySQL 5.5 on Ubuntu Linux 64-bit OS . Also I've already set hibernate & c3p0 connection encoding property to UTF-8 too. When I debug, the data comes from client is true. Here's my config and I'll be so happy if someone

Configuring the built-in c3p0 pooling in Hibernate using Spring

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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 Hibernate using Spring. When I tried to do below, it wouldn't work: <bean id="dataSource" class="org

How good is Oracle Universal Connection Pool (UCP)

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Does anybody have experience with using Oracle UCP under real production load? Does it handle database reconnects well? Are there any multi-threading issues? Has anybody compared it with C3P0 or Apache DBCP? MRalwasser I evaluated UCP 11.2.0.1 as a replacement for our legacy connection pool and I cannot recommend it : it does not fully support jdk 6 / ojdbc6.jar. For example the use of statement caching and jmx-support does not work with java 6 and throws exceptions. no internal statement cache - it relies on the jdbc driver's statement cache ( setPoolable() ) I submitted both issues to oracle

What is the benefit of Connection and Statement Pooling?

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Can someone explain what is Connection and Statement Pooling and what is the benefit over unpooled DataSources? I am trying to understand when it is a good idea to use a technology like c3p0 or proxool in a project. I need first to understand what they do and when it interesting to use them. Thank you very much. The Happy Connection It's so easy to create a new connection every time. One line: that's all it takes. Nothing much to think about. Great life. Hold on. Do you eat on a plate? Do you throw away your plate after each use? No, you wash it and put it on the dish rack, so you can use it

Manage Connection Pooling in multi-tenant web app with Spring, Hibernate and C3P0

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I'm trying to setup a multi-tenant web application, with (ideally) possibility for both Database-separated and Schema-separated approach at the same time. Although I'm going to start with Schema separation. We're currently using: Spring 4.0.0 Hibernate 4.2.8 Hibernate-c3p0 4.2.8 (which uses c3p0-0.9.2.1) and PostgreSQL 9.3 (which I doubt it really matters for the overall architecture) Mostly I followed this thread (because of the solution for @Transactional ). But I'm kinda lost in implementing MultiTenantContextConnectionProvider . There is also this similar question asked here on SO, but

C3P0 Spring Hibernate: Pool maxed out. How to debug?

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I have a Spring Hibernate application on Tomcat. Connection pool is C3P0 I am rapidly encountering a thread pool maxed out warning from C3P0. Then all requests to the webapp hang. I am still assuming that somewhere in the code I have missed an @Transaction annotation. I want to debug my code. Question: Can I access the connection pool via code so I can debug when a connection is released and when it is not released? UPDATE: Current c3p0 config:  <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close"> <property name="driverClass" value=