c3p0 head

Tags: database connection pool C3P0 database Java JDBCC3P0 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

Label:The most common open source data connection pools are c3p0, dbcp, and Proxool, with three of them:The Hibernate Development Group recommends the use of c3p0;Spring Development Group recommends the use of DBCP (DBCP connection pool has WebLogic connection pool the same problem, is forced to close the connection or the database restart, cannot reconnect, tell the connection is reset, this setting can be

Recently I wrote a database collection program. The process is to periodically collect data from the SQLSERVER database to the Oracle database. Data is generated once an hour, and each time the data volume is about 2 W. Sping3 + hibernate4 is used in the environment. When C3p0 is used in the database connection pool, it is reported every time: c3p0connectionisalreadyclosed I started Recently I wrote a database collection program. The process is to per

1.c3p0 use of data sources　　　　C3P0 is an open source JDBC connection pool that implements the data source and Jndi bindings, and supports the standard extensions of the JDBC3 specification and JDBC2. C3P0 has its own format file, as follows Guide Jar Package: Establishing a C3P0 conn

Mysql Tomcat C3p0 System Performance Tuning personal summary, System Information The application logic is to use c3p0 to query data in the database and return Json data over http. 1. the initial test result JMeter test result before optimization No. Type Original 1000 data bigger 1 500 Connection 250 query/S 63q/S70q/S 2 1000 connections 255q/S 57q/S65

C3p0 displays An attempt by a client to checkout a Connection has timed out, java.sql.SQLException: An attempt by a client to checkout a Connection has timed out.at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:106)at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:65)at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:527)at com.mc

than 8 hours, MySQL will automatically disconnect the connection. This is the problem. If c3ons in c3p0 pools is idle for more than 8 hours, MySQL disconnects it, while c3p0 does not know that the connection has expired. If a client requests a connection, c3p0 provides the invalid connection to the client, which will cause the above exception. There are three so

CentOS Monitor Tomcat current command line outputTail-f .../apache-tomcat-x.x.x/logs/catalina.out Main error content of C3P0 under Linux31-jul-2014 14:14:43.072 INFO [localhost-startstop-1] com.mchange.v2.c3p0.impl.C3P0ImplUtils.generateVmId Failed to Get local inetaddress for VMID. This was unlikely to matter. At all. We ll add some extra randomnessjava.net.UnknownHostException:XXX.XXX:XXX.XXX:Name or serv

1, using Org.springframework.jdbc.datasource.DriverManagerDataSource Description: Drivermanagerdatasource to establish a connection is as long as there is a connection to create a new connection, there is no connection pool role. The third way is to configure the data source in the Web server, which is not easy to deploy, and I recommend that you configure the data source in every two ways. Configure a data sourceSpring contains two implementation packages of data sources in third party d

First, a connection, introduce the difference between the various connection pools and performance differences (BONECP newer, higher performance) connection pool difference C3P0 is an open source JDBC connection pool that can be C3P0-JDBC3 Connection and Statement if the English is good pooling The version used here is c3p0-0.9.5.2: The required JDK is 1.6 or abo

-developed connection pools are mainly dbcp and c3p0. C3P0 Brief Introduction: C3P0 is an open source JDBC connection pool. It implements the data source and Jndi bindings, and supports the standard extensions of the JDBC3 specification and JDBC2. The open source project that uses it now has hibernate,spring and so on. DBCP Brief Introduction: DBCP (database co

First, the introduction of JAR packageSecond, Java code1 @Test2 Public voidTestxml ()throwsException {3 //creating the C3P0 Connection Pool core tool class4 //automatic loading src under c3p0 profile "C3p0-config.xml"5Combopooleddatasource DataSource =NewCombopooleddatasource ();//Use the default configuration6PreparedStatement pstmt =NULL;7

external IP address is unrealistic. In this way, there is a concept called connection pool. Because not every user needs to access the Internet at the same time, when a user needs to access the Internet, he can obtain an external IP address from the connection pool to access the Internet. When the user no longer needs to access the Internet, the IP address is put back in the connection pool and can be accessed by other users. The connection pool is mainly used to solve the problem of IP address

Tomcat is running well. The boss said the server is down. Hurry and check it out... It is still running, but an error is reported ...... A little problem. Restart tomcat. So... restart... The problem of C3P0-0.9.1.jar package appeared: 16:15:57. 500 [COM. mchange. v2.c3p0. c3p0registry]-[info] initializing c3p0-0.9.1 [built 16-January-2007 14:46:42; debug? True;

Note: required jar packages: C3p0-0.9.1.2-jdk1.3.jarC3p0-0.9.1.2.jar C3p0-oracle-thin-extras-0.9.1.2.jar You also need a configuration file to store the database connection data. DB. Properties Package CN. c3p0;Import java. SQL. connection;Import java. SQL. resultset;Import java. SQL. sqlexception;Import com. mchange. v2.c3