c3p0

Tags: style blog color os using IO for AR dataAbout C3P0, DBCP and Proxool, such as the comparison, configuration on the internet has a lot of articles, I do not waste everyone's time, mainly on the following I have used these three after the experience. DBCP: The framework used to be dbcp, Online said, there are many bugs, at least, these bugs, I have not encountered, from the situation of our system operation, can also, there is not too muc

Original address: The difference between C3P0 and DBCP https://blog.csdn.net/huangxinyu_it/article/details/50826463 C3P0 Introduction:C3P0 is an open-source JDBC connection pool that implements data source and Jndi bindings, and supports standard extensions for JDBC3 specifications and JDBC2. The open source project that uses it now has hibernate,spring etc.DBCP Introduction:DBCP (db connection pool),

This is an example I have seen on the internet before, I think c3p0 more mature, stable, in the general project to choose C3P0 to do database connection pool is better, so I posted in the Applicationcontext.xml file to configure an example of C3P0, for reference.

A new frame to do junit test times out of the following error. Java.lang.Exception:DEBUG STACK TRACE for Poolbackeddatasource.close (). At Com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.close (abstractpoolbackeddatasource.java:417) at Sun.reflect.NativeMethodAccessorImpl.invoke0 (Native method) at Sun.reflect.NativeMethodAccessorImpl.invoke ( nativemethodaccessorimpl.java:39) at Sun.reflect.DelegatingMethodAccessorImpl.invoke ( DELEGATINGMETH

Today in doing a Java project to use the C3P0 data source, the program runs under Windows without any problems, but to the server (Linux environment) when the deployment of the runtime abnormal, the exception information is as follows: 2014-08-19 20:51:01 [INFO] Failed to get local inetaddress for VMID. This is unlikely to matter. At all. We ll add some extra randomness java.net.unknownhostexception:w: W at Java.net.InetAddress.getLocalHost (Unknow

Label:(a) C3P0C3P0 is the recommended connection pool for hibernate, which automatically cleans up connection, Statement, ResultSet, and requires c3p0-dependent jar packages.Configuration filedriverclass=com.mysql.jdbc.Driver jdbcurl=jdbc:mysql://127.0.0.1:3306/mydb user=root =w5566 maxpoolsize=40 minpoolsize=2 Initialpoolsize=10 maxstatements=180Java implementation PublicConnection C3p0conn () {//Load configuration fileProperties props =NewPropertie

1, first write Db_cn.properties properties file Db. Driver=oracle.jdbc.driver.oracledriverDb. url=jdbc/:oracle/:thin/:@192.168.1.162/:1521/:ora10gDb. User=new_lotteryDb. Pwd=new_lotteryDb. Acquireincrement=1Db. Initialpoolsize=1Db. Maxpoolsize=3Db. Minpoolsize=1Db. maxidletime=120Db. maxstatements=180Db. idleconnectiontestperiod=3600 Storage-related configuration of database connections 2, write test Java-----datahandling class. Package com.diagram.basis.common.db; Import java.sql.Connection

Although DBCP is a widely used connection pool, I think that C3P0 has higher performance and stability on Tomcat. Here's how to use C3P0 in spring: class= "Org.springframework.orm.hibernate3.LocalSessionFactoryBean" >Org.hibernate.dialect.Oracle9Dialect

Bind the Connection object to the current thread so that the link can be used in each method.Datasourceutils.javaPackage Com.itheima.utils;import Java.sql.connection;import Java.sql.resultset;import java.sql.SQLException;import Java.sql.statement;import Javax.sql.datasource;import Com.mchange.v2.c3p0.combopooleddatasource;public Class datasourceutils {private static Combopooleddatasource ds=new Combopooleddatasource ();p rivate static threadlocaljava-

DBCP Connection Pool configuration About DBCP Connection pool The specific use of the method also need to refer to: Click to open the link dbcp jar package Commons-dbpc.jar, Commons-collections.jar, commons-pool.jar download click to downloadc3p0 Connection Pool configuration For more information on C3P0 connection pooling use: Click to open linkc3p0 jar Package C3p0-0.9.2.jar Download Click to down

Jdbcutil class: Package com.xiaohui.jdbc.util; Import java.sql.Connection; Import java.sql.PreparedStatement; Import Java.sql.ResultSet; Import java.sql.SQLException; Import Javax.sql.DataSource; Import Com.mchange.v2.c3p0.ComboPooledDataSource; Public final class Jdbcutil {private static Combopooleddatasource DataSource; static {DataSource = new Combopooleddatasource (); }//Get link public static Connection getmysqlconnection () throws SQLExcept

--------------------------------------------------------------------------------------------------------------- ----------------------------Import Com.mchange.v2.c3p0.ComboPooledDataSource;Combopooleddatasource pool=new Combopooleddatasource ();System.out.println (Pool.getproperties ());//the user name and password of MySQL can be exported here;for (int i=0;iConnection con=pool.getconnection ();System.out.println (Con.hashcode ());//This is the addres

pool can set the maximum and minimum connections, connection waiting time, etc., basic functions are available. The configuration of this connection pool is described in the attachment compression package: Dbcp.xmlUsage Evaluation: In the specific project application, it is found that the stability of the continuous operation of this connection pool is still possible, but the speed is slightly slower, the stability under the pressure of the large concurrent quantityThe connection pool monitorin

One, the XML file reads the. properties file to connect to the database1. Configuration in XML fileHowever, because the pre-cached statements belong to a single connection instead of the entire connection pool, setting this parameter takes into account a number of factors. If both maxstatements and maxstatementsperconnection are 0, The cache is closed. Default:0-->2. The Properties Property fileJdbc.initialpoolsize=20jdbc.maxpoolsize=100jdbc.minpoolsize=10jdbc.maxidletime=600Jdbc.acquireincremen

Name="Removeabandonedtimeout" value="$"/ > property name="logabandoned" value="true"/> - property name="maxwait" value="/> " Bean> -- bean id= "dataSource" class=" Com.mchange.v2.c3p0.ComboPooledDataSource " destroy-method=" Close "> property name="Jdbcurl" value="${jdbc.url}" /> property name="Driverclass" value="${ Jdbc.driverclassname} " /> property name="user" value="${jdbc.

Package Com.itheima.c_c3p0;import Java.sql.connection;import Java.sql.sqlexception;import Javax.sql.DataSource; Import Com.mchange.v2.c3p0.combopooleddatasource;public class C3p0utils {//provide connection pool private static DataSource DataSource = New Combopooleddatasource ("Day17_config"); public static Connection getconnection () throws sqlexception{//the return datasource.getconnection () obtained from the connection pool; /** * Data source, Con

Directly on the codeXmlns:xsi= "Http://www.w3.org/2001/XMLSchema-instance" xmlns:aop= "HTTP://WWW.SPRINGFRAMEWORK.ORG/SCHEMA/AOP"xmlns:p= "http://www.springframework.org/schema/p"xsi:schemalocation= "Http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/ Spring-aop-2.0.xsd Http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/ Spring-beans-3.1.xsd Http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/ Spr

Applicationcontext. xml file: COM. mySQL. JDBC. driver JDBC: mysql: // 192.168.3.110: 3306/dbname? Useunicode = true & characterencoding = GBK root root 5 30 10 60 5 0 60 30 true

-------------------- * Hibernate. cfg. xml ---------------------------------- "-// Hibernate/hibernate configuration DTD 3.0 // en"Http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd>Org. hibernate. Connection. c3p0connectionprovider

I think I was writing a connection pool myself before. Now there is no more than a large number of connection pools, and I guess I will never write it myself. The following is an example of two connection Ms sqlserver. Connect to other databases and