java jdbc connection pool

Tags: sharding first come ROM features tor mid-large number usage performance improvementMainstream database connection poolCommon open source database connection pools are c3p0, DBCP, Tomcat Jdbc pool, BONECP, druid, etc.C3P0: Open source JDBC

information of JDBC directly after creating the object, such as: Database driver, database URL, login database user name and password, and then manipulate the database. - * Mode two: Build an XML or properties configuration file, there is no need to set the basic information of the database when the configuration file exists. Direct access to database connections, corresponding operations to the database - */ - Public classC3P0 { + Public Sta

first is to understand the configuration of the connection pool (above)The second is to know the wait_timeout settings in MySQLTwo-point combination to determine the proper configuration of the connection pool in the project.If Wait_timeout is set to a large value, such as a year, the configuration above is correct in

) + "" +rs.getstring (2)); - } - rs.close (); A conn.close (); + the } - $}c3p0 Connection Pool1 C3p0-config>2 Default-config>3 Propertyname= "Driverclass">Com.mysql.jdbc.Driver Property>4 Propertyname= "Jdbcurl">Jdbc:mysql:///day01 Property>5 Propertyname= "User">Root Property>6 Propertyname= "Password">Root Property>7 8 9 Default-config>Ten C3p0-config>C3p0-config.xmlC3p0 Creating a

Using Tomcat's JDBC Connection pool in the project, the problem was that when the database was restarted, the service did not reconnect to the database and needed to restart the deployed project to connect to the database. After testing the configuration to make a change:Add two configuration attributes where DataSource is configured: name= "Testonborrow"

Java Database Connection Pool JDBCDemo. java: package com. itheima. jdbc; import java. SQL. connection; import java. SQL. preparedStatement;

= "111111" driverclassname= "Com.mysql.jdbc.Driver"Url= "Jdbc:mysql://localhost:3306/testdb"/>The meanings of the attributes in the resource tag in the configuration file:The full name of the database-driven class used by the DRIVERCLASSNAME-JDBC.Maxactive-The maximum number of active connections that the connection pool provides at the same time.Maxidle-The maximum number of connections that the

the auth attribute in the 4. Write and use JavaCodeAnd put it in the Tomcat environment, as follows: Create a JSP Example: myjsp. jsp Pageencoding = "UTF-8" %> Import = "Java. Io. *" %> Import = "Java. util. *" %> Import = "Java. SQL. *" %> Import = "Javax. SQL. *" %> Import = "Javax. Naming. *" %> Try {Connect