c3p0 properties

Org.hibernate.TransactionException:JDBC commit failedDescription The server encountered an internal error that prevented it from fulfilling this request.exceptionOrg.springframework.web.util.NestedServletException:Request processing failed; Nested exception is Org.springframework.orm.hibernate3.HibernateSystemException:JDBC commit failed; Nested exception is Org.hibernate.TransactionException:JDBC commit failedOrg.springframework.orm.hibernate3.HibernateSystemException:JDBC commit failed; Neste

;Org.hibernate.dialect.MySQLDialect Property> Propertyname= "Show_sql">True Property> MappingResource= "Com/model/nation.hbm.xml" /> session-factory>hibernate-configuration>Implementation class Packagecom.test;ImportJava.util.Calendar;Importjava.util.List;Importorg.hibernate.Session;Importcom.model.Nation; Public classTest { Public Static voidMain (string[] args) {LongStart =calendar.getinstance (). Gettimeinmillis (); Session Session=hibernateutil.getsession (); //Nation data

I read the hibernate in the book I'll post the source code and configuration files. Let's see what it is,I. hibernate. cfg. xml file "-// Hibernate/hibernate configuration DTD 3.0 // en"Http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd> Note: it should be ", but who will destroy it? A thread needs to follow hibernate. c3p0. idle_test_periodSet the time interval to automatically verify these linked objects and destroy timeout -->Ii. Stud

Spring with C3P0 connection pool applicationContext. xml file: Article Source: http://www.javaeedev.com/blog/article.jspx? ArticleId = ff8080811a2a52f2011a383e5baf09da

1. hibernate default connection pool Public "-// hibernate/hibernate configuration DTD // en" Http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd> JDBC: mysql: // localhost: 3306/schoolproject 2. c3p0 connection Configuration Public "-// hibernate/hibernate configuration DTD // en" Http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd> JDBC: mysql: // localhost: 3306/schoolproject

public class c3p0demo{/*Code configuration*/public void Fun1 () {To create a connection pool objectCombopooleddatasource DataSource = new Combopooleddatasource ();Four-parameter configuration for connection poolingDatasource.setdriverclass ("Com.mysql.jdbc.Driver");Datasource.setjdbcurl ("Jdbc:mysql://loaclhost:3306/mydb");Datasource.setuser ("root");Datasource.setpassword ("root");Pool ConfigurationDatasource.setacquireincrement (5);Datasource.setinitialpoolsize (20);Datasource.setminpoolsize (

Package CN. secondteam. utils; import Java. beans. propertyvetoexception; import Java. SQL. connection; import Java. SQL. preparedstatement; import Java. SQL. resultset; import Java. SQL. sqlexception; import Java. SQL. statement; import COM. mchange. v2.c3p0. combopooleddatasource; public class dbutil {final static string host = "127.0.0.1"; Final Static string name = "root"; Final Static string psw = "root"; static final St Ring dbname = "bbsdb"; Pr

The following parameters are the basic configuration parameters used:Initialpoolsize:Number of connections a pool will try to acquire upon startup. shocould be between minpoolsize and maxpoolsizeNumber of links obtained during connection pool initialization, between minpoolsize and maxpoolsize Minpoolsize:Minimum number of connections a pool will maintain at any given time.Minimum number of links Maxpoolsize:Maximum number of connections a pool will maintain at any given time.Max connections

Hibernate 1-to-many deadlockFrequent deadlocks in spring + hibernate + Struts + SQL databases. The query is deadlocked after update is executed. It's dead. You have to stop tomcat to continue running. Solution: use the database connection pool c3p0-->

We usually use data connection pools in actual projects, because the overhead is relatively small; Jar package with c3p0 in the hibernate package; Add the following to hibernate. cfg. xml:

　　C3P0 data Source Definition

caused By:java.lang.ClassNotFoundException:com.mchange.v2.ser.IndirectorAt Java.net.urlclassloader$1.run (urlclassloader.java:200)At java.security.AccessController.doPrivileged (Native Method)At Java.net.URLClassLoader.findClass (urlclassloader.java:188)At Java.lang.ClassLoader.loadClass (classloader.java:307)At Sun.misc.launcher$appclassloader.loadclass (launcher.java:301)At Java.lang.ClassLoader.loadClass (classloader.java:252)At Java.lang.ClassLoader.loadClassInternal (classloader.java:320)..

1. Jar Package HIBERNATE-RELEASE-4.1.8.FINAL\LIB\OPTIONAL\C3P02. Join the configuration:database connection pool minimum connections--The connection pool itself does not remove itself from the connection pool, but rather has a thread that groups it at certain intervals.This thread compares the time difference between the last time the connection object was used and the current one to timeout, and then decides to destroy the connection object.The number of cache statement-Using the

Transfer example (1): Dao implementation (in this example, QueryRunner is used to execute SQL statements, and the data source is C3P0 ), Disadvantage: the Dao layer completes Service-level operations, which is not conducive to later code modification and reconstruction. 1. Create C3P0Util on your own Account Database 2. jar package 3. Dao Layer Interface: Package com. learning. dao; import com. learning. domain. account; public interface AccountDao

First, Hibernate.cfg.xml documents: "-//hibernate/hibernate Configuration DTD 3.0//en""Http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd" > Second, beans.xml documents: xmlns:context= "Http://www.springframework.org/schema/context"xmlns:aop= "HTTP://WWW.SPRINGFRAMEWORK.ORG/SCHEMA/AOP"xmlns:tx= "Http://www.springframework.org/schema/tx"Xmlns:xsi= "Http://www.w3.org/2001/XMLSchema-instance"Xsi:schemalocation= "Http://www.springframework.org/schema/beansHttp://www.springframework.or

We typically use data connection pooling in actual projects because the overhead is relatively small; A jar package with C3P0 in the Hibernate package; Add in Hibernate.cfg.xml:

I. Proxool configuration 1. Persistence.xml 1. 2. Add the Proxool.xml file in the SRC directory, the file configuration is as follows 1. Second, c3p0 link pool configuration 1.

Cons: The DAO level completes the service level operation, which is detrimental to later code modification and refactoring1. Create your own C3p0utilAccount Database2.jar Pack3.Dao levelInterface: PackageCom.learning.dao;ImportCom.learning.domain.Account; Public InterfaceAccountdao {/*** Transfer *@paramfromname Transfer out user *@paramtoname Transfer to User *@paramMoney transfer Amount*/ Public voidUpdateaccount (String fromname,string ToName,DoubleMoneythrowsException;}Implementation cla

　　Configuration information for c3p0 in JDBC

C3P0 Database Connection Pool usage1. Copy jar package: C3p0-0.9.1.2.jar C3p0-0.9.1.2-jdk1.3.jar C3p0-oracle-thin-extras-0.9.1.2.jar (required by Oracle)2, write the preparation file in the SRC directory: c3p0-config.xml (the name can only be this)3, Class C3p0utilC3p0-confi