c3p0 | 易学教程

hibernate c3p0 ThreadPoolExecutor Connection pooling, am I doing it right?

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问题 I am using hibernate and c3p0 for the database, and i have an java application, with ThreadPoolExecutor. What i am doing is, I am enquing different Tasks each related to hibernate, to store data with Hibernate using Transactions, and getCurrentSession. So I have new ThreadPoolExecutor(CORE_POOL_SIZE, MAX_POOL_SIZE, KEEP_ALIVE_TIME, TimeUnit.MINUTES,taskQueue); Runnable { @Override public void run() { Session session = HibernateDAO.getInstance().getCurrentSession(); Transaction tx = null; try

Using c3p0 connection Pooling in a tomcat Spring based App

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问题 I have a Spring Based Web App running under tomcat 6. Now, I want to use c3p0 connection pooling instead of tomcat's default DBCP. So, from the c3p0 help doc, I have defined the data source in context.xml something like: <Resource name="jdbc/sample" auth="Container" driverClassName="oracle.jdbc.driver.OracleDriver" url="jdbc:oracle:thin:@someServer:1551:xyz" username="userName" password="pwd" validationQuery="SELECT 1 FROM dual" testOnBorrow="true" testWhileIdle="true" factory="org.apache

hikaricp get number of busy connection

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问题 Like we can get the number of busy connection in c3p0 by using method like dataSource.getNumBusyConnections() , the same way how can we do that in case of hikaricp? Can anyone provide all the related methods between c3p0 and hikaricp? Also what is the destroy (in c3p0) method equivalent in hikaricp? 回答1: Re: connections, see these wiki pages: JMX Monitoring (via console and programatically Using Codahale/Dropwizard Metrics HikariDataSource supports both close() and shutdown() methods, they

Hibernate/C3P0: Is there a way to check if the connection is down in real time?

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问题 I have an application which we'll refer to as App.class that checks the database every second for real time events. I encountered an instance where the database was down and App.class kept on retrying and throwing an exception. What I want to achieve is to determine whether a valid connection is available or not in real time. I can get the provider by: C3P0ConnectionProvider provider = (C3P0ConnectionProvider) sessionFactoryImpl.getConnectionProvider() and I could check if the connection is

shared c3p0 connection pool with hibernate and mysql on tomcat

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问题 Iam working on a project where i want to configure a shared connection pool with hibernate on tomcat. The project is already implemented and i have to change it. It was configured with hibernate and c3p0 connection pool where all jars where in the project itself. I copied all jar files for connection pooling into the lib folder of tomcat . c3p0-0.9.5.2.jar c3p0-oracle-thin-extras-0.9.5.2.jar mchange-commons-java-0.2.11.jar mysql-connector-java-5.1.40-bin.jar in server.xml i made a Resource

Connection pooling in java using c3p0

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问题 I want to using c3p0 for connection pooling in none-web application java program that i wrote. I used traditional singleton connection and I am not satisfied with its performance, so I decided to go for connection pooling. I take a look at c3p0 website and here is what they told about using c3p0: ComboPooledDataSource cpds = new ComboPooledDataSource(); cpds.setDriverClass( "org.postgresql.Driver" ); //loads the jdbc driver cpds.setJdbcUrl( "jdbc:postgresql://localhost/testdb" ); cpds.setUser

c3p0 hangs on getConnection when there is a network failure

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问题 I'm using c3p0 ComboPooledDataSource to pool database connections (to an Oracle 10g database). I'm having problems with handling database connectivity outages. If there is no connection to the database when the first connection is being acquired, the checkout timeout fires and it fails as expected. However, if a connection outage occurs after one or more connections have been acquired and are already in the connection pool, calling getConnection() just hangs. No exception is thrown. I'm

hibernate exception：could not insert collection rows

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问题 I am using hibernate to do mapping to database. But encountered the following error: A exec job config finished. org.hibernate.exception.JDBCConnectionException: could not insert collection rows: [com.myCompany.jobsrc.ExecJob.subRunningIDs#1] at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:99) at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66) at org.hibernate.persister.collection.AbstractCollectionPersister.insertRows

Spring Hibernate C3P0: Connections not released

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问题 C3P0 is not releasing connections after a transaction completes. Here's the stack trace: java.lang.Exception: DEBUG STACK TRACE: Overdue resource check-out stack trace. at com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource(BasicResourcePool.java:555) at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutAndMarkConnectionInUse(C3P0PooledConnectionPool.java:755) at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:682) at

Hibernate-配置

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什么是持久化技术持久化技术。就是把数据保存到可永久保存的存储设备中。持久化的主要应用是将内存中的对象存储在关系型数据库中。什么是ORM 对象关系映射。通过ORM我们可以通过类的方式去操作数据库，而不用原生的SQL语句。通过把表映射成类，把行当作实例，把字段当作属性。 ORM在执行对象操作的时候最终还是会把对应的操作转换为数据库原生语句。新建工程步骤导入相关的包创建orm类创建Hibernate核心配置文件创建映射关系创建类执行导包必须依赖的包hibernate-release-5.3.1.Finallibrequired 数据库包 c3p0连接池c3p0.jar 单元测试junit-4.9.jar 创建ORM类 import lombok.Getter; import lombok.Setter; @Getter@Setter public class Students { private int id; private String name; private int age; @Override public String toString() { return "Students{" + "id=" + id + ", name='" + name + ''' + ", age=" + age + '}'; } } 核心配置文件 hibernate