c3p0 head

Original: http://www.mchange.com/projects/c3p0/#configuring_connection_testing C3P0 provides a variety of methods for detecting failed connections, preventing programs from using invalid connections to complain. Connections fail for many reasons: JDBC driver actively shuts down long time connections, database or network reasons, insufficient resources, driver bugs, or other reasons.

First look at c3p0 this connection pool, the biggest advantage can automatically read the default configuration filedefault-config> //localhost:3306/swift_db default-config>There are general 4 main options and some other configurations in the configuration fileJust use the implementation class Combopooleddatasource in C3P0 to implement the Javax.sql.DateSource interface to create objectsprivat

Head schoolbag for HTTP request information, request head schoolbag The head schoolbag contains important information related to HTTP requests, such as ip, host, url, and client, as shown in the following table: Variable name Value Accept Text/html, application/xhtml + xml, application/xml; q = 0.9, image/webp, */*; q = 0.8 Accept

PS How to make the figure of the head of funny Big head comic effect Original Final effect 1, with a rectangular selection tool box to the head, down to flatten a little, so that some of the characters will be more obvious, unless some face thin and long people, to both sides squeezed flat. 2, very key, with the great liquefaction tools to highlight t

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result set if (rs! = Null) {try {rs. close () ;}catch (SQLException e) {}}// close the database operation object if (stmt! = Null) {try {stmt. close () ;}catch (SQLException e) {}}// close the database connection if (conn! = Null) {try {conn. close () ;}catch (SQLException e ){}}} driverClassName=com.ibm.db2.jcc.DB2Driverurl=jdbc:db2://10.10.38.138:50000/malltestusername=db2inst1password=db2inst1initialSize=3maxActive=5maxIdle=3minIdle=1maxWait=30000 ComboPooledDataSource CPPS = new ComboPooled

1. Import the jar package:Hibernate-release-4.3.5.final/lib/optional/*.jar2. Add Configuration:hibernate.c3p0.max_size: Maximum number of connections to the database connection poolHibernate.c3p0.min_size: Minimum number of connections to the database connection poolHibernate.c3p0.timeout: The Connection object in the database connection pool should be destroyed when it has not been used for a long timeHibernate.c3p0.max_statements: Number of cached Statement objectsHibernate.c3p0.idle_test_peri

C3p0 connection pool configuration problems, Correct configuration file 1 The whole process is to watch the video, but an error occurs in this line. The correct format is "//"

=com.mysql.jdbc.driverurl=jdbc:mysql://localhost:3306/testusername=rootpassword=sorry#C, use canpublic class Dbcputil {private static DataSource datasource;static{try {InputStream in = DBCPUtil.class.getClassLoader () . getResourceAsStream ("dbcpconfig.properties"); Properties props = new properties ();p rops.load (in);d Atasource = Basicdatasourcefactory.createdatasource (props);} catch (Exception e) {throw new Exceptionininitializererror (e);}} public static DataSource Getdatasource () {retur

Jar PackageHibernate.cfg.xml xml version="1.0" encoding="GBK"?> "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd"> name="connection.driver_class">com.mysql.jdbc.Driver name="connection.url">jdbc:mysql://localhost:3306/sampledb name="connection.username">root name="connection.password">qaz name="hibernate.c3p0.max_size">20 name="hibernate.c3p0.min_size">1 name="hibernate.c3p0.timeou

Configuring C3P0 Data sources

C3P0 Connection Pool

C3p0 connection pool Configuration Configuration in hibernate (Spring management: .

DBCP and c3p0 are two database connection pools.Both connection pools are the connection pools recommended by hibernate.DBCP is a database connection pool that relies on the Jakarta commons-pool Object pool mechanism. The Tomcat data source uses DBCP.C3p0 is an open-source JDBC connection pool. It is released together with hibernate in the lib directory, including datasources objects for connection and statement pools that implement the jdbc3 and jdbc

"-//hibernate/hibernate Configuration DTD 3.0//en""Http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd" > jdbc:mysql://localhost:3306/crm?useunicode=trueamp;characterencoding=gb2312Com.mysql.jdbc.DriverOrg.hibernate.dialect.MySQLDialectOrg.hibernate.connection.C3P0ConnectionProviderConfiguration of Hibernate.cfg.xml and C3P0 connection pools

Configuration file Get Database Links Import java.sql.Connection; Import Javax.sql.DataSource; Import Com.mchange.v2.c3p0.ComboPooledDataSource; public class Datasourceutils { private static DataSource ds; Declare ThreadLocal container object private static threadlocal Jsp Bookservlet Private Bookservice service = new Bookservice (); /** * forward to books.jsp * Query Some books /@Override public void Execute (httpservletrequest r

connection pool (not the C3P0 connection pool used here) to get the database connection, so the connection pool must be constructed first. Here are four actions: Add and delete and check @Test public Void Add () { //because JdbcTemplate is dependent on the database connection pool, the connection pool is constructed first Drivermanagerdatasource Drivermanagerdatasource=new Drivermanagerdatasource (); Drivermanagerdatas

1. Introduction of the C3P0 jar package2. Add a configuration in Hibernate's core configuration

fromname,string toname,double Money );}Implementation class: Packagecom.learning. Service.impl;Importjava.sql.Connection;Importjava.sql.SQLException;Importcom.learning. Dao. Accountdao;Importcom.learning. Dao.impl.AccountDaoImpl;Importcom.learning. Domain. account;Importcom.learning. Service. Accountservice;Importcom.learning. util. C3p0util; Public classAccountserviceimplImplementsAccountservice { Public voidTransfer (String fromname, String toname,DoubleMoney ) { //Ad.updateaccount (FromN