java jdbc connection pool

Java implementation of Mysql jdbc connection example bitsCN.com First, create a database in the MySQL consoleSQL code Create database test;Use test;Create table user (username varchar (15), password varchar (20 ));Insert into user values ('userone', '201312 ');You can also use MySQL-Front to create Java code Package co

, and the maximum number of wait requests determined by Maximum-new-connections If the scout thread discovers an idle connection, the SQL statement is used to check for these connections --> Initialization when connection pooling starts Connection pool maximum Maximum idle value, when a peak time passes,

Because work needs to use to connect pool, so read the Internet on the many predecessors of the article, learned a lot of experience, here want to do a summary, add their own ideas and together, hope to give you some help. Objective: To eliminate the overhead and bottlenecks associated with frequent database connections. Solution: Not too much restrictions on the use of users, can not be too much to require users in accordance with the required meth

[Java]Package com. iflytec. ex02;Import java. SQL. Connection;Import java. SQL. DriverManager;Import java. SQL. ResultSet;Import java. SQL. ResultSetMetaData;Import java. SQL. SQLExcept

Importjava.beans.PropertyVetoException;Importjava.sql.Connection;Importjava.sql.SQLException;ImportJavax.sql.ConnectionPoolDataSource;Importjavax.swing.text.DefaultEditorKit.InsertBreakAction;ImportCom.mchange.v2.c3p0.ComboPooledDataSource; Public classConnectData { Public Static voidMain (string[] args) {System.out.println (connectdata.getconnection ()); } Private StaticString username= "LF"; Private StaticString password= "LF"; Public StaticConnection getconnection () {//Create a

= drivermanager.getconnection (URL, prop);Interface The Java.sql class DriverManager in driver Common methods are: getconnection (string url, string user, string password) attempt to establish a connection to a given database URL. Connection interface: Connection to a specific database (session). Executes the SQL statement in the

With the C3P0 connection pool, you do not need to parse the configuration file yourself, just create a profile with the specified name under the SRC folder.To create a project:C3p0.xml configuration file:　　C3p0test.java:Package Com.gordon.c3p0;import Java.util.list;import Org.apache.commons.dbutils.queryrunner;import Org.apache.commons.dbutils.handlers.arraylisthandler;import Com.mchange.v2.c3p0.combopooled

. Waitingthreadcount Number of threads waiting to establish database connections per unit of time The best performance of the system is that the value is always kept in a very small number, and if the value is large, the system needs to be tuned Percentmaxed Percentage of time that all connections in the database have been used Make sure that this value does not reach 100% for a long time, and if so, you should consider increasing the poosize val

step, using connection poolingIn a project, you can only have one instance of datasource. There are several connectioin in this dataqSource3. Declare a factory class, create a DataSource that maintains only one Package cn.itcast.utils; import java.sql.Connection; import java.sql.SQLException; import java.util.Properties; Import Javax.sql.DataSource; Import Org.apache.commons.dbcp.BasicDataSourceFactory; Public classDatasourceutils {Privatedatasource

Tags: java JDBC SQL ServerAbout the Java JDBC Connection to SQL Server and the connection to the MySQL database is the same, in order to facilitate later viewing, the author here to give a demo.Package Com;import Java.sql.connecti

(Basicdatasource.java:1545) ... 71More caused by: java.net.UnknownHostException: Saas.database:nodename nor servname provided, or not known At Java.net.Inet6AddressImpl.lookupAllHostAddr (Native Method) at java.net.inetaddress$2.LOOKUPALLHOSTADDR (inetaddress.java:928) at Java.net.InetAddress.getAddressesFromNameService (Inetaddress.java:1323) at JAVA.NET.INETADDRESS.GETALLBYNAME0 (Inetaddress.java:1276) at Java.net.InetAddress.getAllByName (Inetaddress.java:1192) at Java.net.InetAddress.ge

, httpservletresponse response)throwsservletexception, IOException {//TODO auto-generated Method Stub } /** */ protected voidDoPost (HttpServletRequest request, httpservletresponse response)throwsservletexception, IOException {}/*** It will start when created*/@Override Public voidInit ()throwsservletexception {Try { //Note the Guide pack javax.naming.Context;Context context=NewInitialContext (); Context Jndi= (Context) context.lookup ("Java:comp/env")); DataSource Source

Java uses JDBC Connection database to do JSON encapsulation and parsing examples This example is an example of using SOLServer2007 to connect a database with JDBC and to query the data format encapsulated into JSON. Directly on the code-- Main function Package Com.kuatang.jsondatas; Import Java.io.File; Import