The basic principles of connection pooling: connection pooling basic ideology is the pre-established links with objects placed in memory for use. For more than a few links to the pool of concurrent link request, the request should be in the queue waiting. And applications can be linked to utilization, dynamic increase or decrease in the number of links to the pool. To achieve the optimal link.

连接池连接数据库
................\dbcptest
................\........\.classpath
................\........\.mymetadata
................\........\.project
................\........\src
................\........\...\com
................\........\...\...\acccp
................\........\...\...\.....\fan
................\........\...\...\.....\...\db
................\........\...\...\.....\...\..\Basedao.java
................\........\...\...\.....\...\entity
................\........\...\...\.....\...\......\NoteBook.java
................\........\...\db.propertities
................\........\WebRoot
................\........\.......\index.jsp
................\........\.......\META-INF
................\........\.......\........\MANIFEST.MF
................\........\.......\WEB-INF
................\........\.......\.......\classes
................\........\.......\.......\.......\com
................\........\.......\.......\.......\...\acccp
................\........\.......\.......\.......\...\.....\fan
................\........\.......\.......\.......\...\.....\...\db
................\........\.......\.......\.......\...\.....\...\..\Basedao.class
................\........\.......\.......\.......\...\.....\...\entity
................\........\.......\.......\.......\...\.....\...\......\NoteBook.class
................\........\.......\.......\.......\db.propertities
................\........\.......\.......\lib
................\........\.......\.......\...\commons-dbutils-1.1.jar
................\........\.......\.......\web.xml
................\........\连接池练习(1).pdf
................\........\连接池练习(2).pdf
................\properties配置连接属性
................\......................\testddb
................\......................\.......\.classpath
................\......................\.......\.mymetadata
................\......................\.......\.project
................\......................\.......\log
................\......................\.......\...\Logfile.1
................\......................\.......\...\Snapshot.1
................\......................\.......\...\Version_Number
................\......................\.......\src
................\......................\.......\...\com
................\......................\.......\...\...\wq
................\......................\.......\...\...\..\db
................\......................\.......\...\...\..\..\BaseDAO.java
................\......................\.......\...\db.properties
................\......................\.......\WebRoot
................\......................\.......\.......\index.jsp
................\......................\.......\.......\META-INF
................\......................\.......\.......\........\MANIFEST.MF
................\......................\.......\.......\WEB-INF
................\......................\.......\.......\.......\classes
................\......................\.......\.......\.......\.......\com
................\......................\.......\.......\.......\.......\...\wq
................\......................\.......\.......\.......\.......\...\..\db
................\......................\.......\.......\.......\.......\...\..\..\BaseDAO.class
................\......................\.......\.......\.......\.......\db.properties
................\......................\.......\.......\.......\lib
................\......................\.......\.......\.......\web.xml
................\sqljdbc.jar
................\tomcat-dbcp.jar
................\笔记.txt

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