c3po和Proxool

<!--紅色爲sqlserver,黑色爲mysql-->

Hibernate中默認的配置:

<?xml version='1.0'encoding='UTF-8'?>
<!DOCTYPE hibernate-configuration
PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory >
<!JDBC驅動程序-->
<propertyname="connection.driver_class">com.mysql.jdbc.Driver</property>
<propertyname="connection.driver_class">net.sourceforge.jtds.jdbc.Driver</property>
<!-- 連接數據庫的URL-->
<propertyname="connection.url">
jdbc:mysql://localhost:3306/schoolproject
</property>
<propertyname="connection.url">
jdbc:jtds:sqlserver://localhost:1433/myuser
</property>
<propertyname="connection.useUnicode">true</property>
<propertyname="connection.characterEncoding">UTF-8</property>
<!--連接的登錄名-->
<propertyname="connection.username">root</property>
<!登錄密碼-->
<propertyname="connection.password"></property>
<!--是否將運行期生成的SQL輸出到日誌以供調試-->
<propertyname="show_sql">true</property>
<!--指定連接的語言-->
<propertyname="dialect">org.hibernate.dialect.MySQLDialect</property>
<propertyname="dialect">org.hibernate.dialect.SQLServerDialect</property>
<!--映射Student這個資源-->
<mapping resource="com/lovo/po/student.hbm.xml"/>
</session-factory>
</hibernate-configuration>

c3p0:

<?xml version='1.0'encoding='UTF-8'?>
<!DOCTYPE hibernate-configuration
PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory >

<propertyname="connection.driver_class">com.mysql.jdbc.Driver</property>

<propertyname="connection.url">jdbc:mysql://localhost:3306/schoolproject</property>
<propertyname="connection.useUnicode">true</property>
<propertyname="connection.characterEncoding">UTF-8</property>

<!--C3P0連接池設定-->

<propertyname="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider
</property>
<propertyname="hibernate.c3p0.max_size">20</property>
<propertyname="hibernate.c3p0.min_size">5</property>
<propertyname="hibernate.c3p0.timeout">120</property>
<propertyname="hibernate.c3p0.max_statements">100</property>
<propertyname="hibernate.c3p0.idle_test_period">120</property>
<propertyname="hibernate.c3p0.acquire_increment">2</property>

<propertyname="show_sql">true</property>

<!--指定連接的語言-->
<propertyname="dialect">org.hibernate.dialect.MySQLDialect</property>

<mappingresource="com/wqbi/model/pojo/student.hbm.xml"/>
</session-factory>
</hibernate-configuration>
Proxool:
(1)先寫proxool的配置文件，文件名：proxool.xml（一般放在與hibernate.cfg.xml文件在同一個目錄中）本例配置的是MYSQL數據庫，數據庫的名字爲schoolproject

<?xml version="1.0"encoding="UTF-8"?>
<!-- the proxool configuration can be embeddedwithin your own application's.
Anything outside the "proxool" tag is ignored.-->
<something-else-entirely>
<proxool>
<!--連接池的別名-->
<alias>DBPool</alias>
<!--proxool只能管理由自己產生的連接-->
<driver-url>

<!--useUnicode=true&characterEncoding=utf-8主要是防止在java容器和數據庫之間的數據產生亂碼-->
jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF-8
</driver-url>
<!?JDBC驅動程序-->
<driver-class>com.mysql.jdbc.Driver</driver-class>
<driver-properties>
<property name="user"value="root"/>
<property name="password"value=""/>
</driver-properties>
<!-- proxool自動偵察各個連接狀態的時間間隔(毫秒),偵察到空閒的連接就馬上回
收,超時的銷燬-->
<house-keeping-sleep-time>90000</house-keeping-sleep-time>
<!-- 指因未有空閒連接可以分配而在隊列中等候的最大請求數,超過這個請求數的
用戶連接就不會被接受-->
<maximum-new-connections>20</maximum-new-connections>
<!-- 最少保持的空閒連接數-->
<prototype-count>5</prototype-count>
<!-- 允許最大連接數,超過了這個連接，再有請求時，就排在隊列中等候，最大的
等待請求數由maximum-new-connections決定-->
<maximum-connection-count>100</maximum-connection-count>
<!-- 最小連接數-->
<minimum-connection-count>10</minimum-connection-count>
</proxool>
</something-else-entirely>

(2)配置hibernate.cfg.xml文件
<?xml version='1.0'encoding='UTF-8'?>
<!DOCTYPE hibernate-configuration
PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory >

<!--連接要加載的類-->
<propertyname="hibernate.connection.provider_class">
org.hibernate.connection.ProxoolConnectionProvider
</property>

<!--連接池的別名-->
<propertyname="hibernate.proxool.pool_alias">DBPool</property>

<!--連接池配置文件的位置-->
<propertyname="hibernate.proxool.xml">proxoolconf.xml</property>
<!--是否將運行期生成的SQL輸出到日誌以供調試-->
<propertyname="show_sql">true</property>
<!--指定連接的語言-->
<propertyname="dialect">org.hibernate.dialect.MySQLDialect</property>
<!--映射Student這個資源-->
<mappingresource="com/wqbi/model/pojo/student.hbm.xml"/>
</session-factory>
</hibernate-configuration>
(1) dialect是聲明ＳＱＬ語句的方言
(2)show_sql定義是否顯示Hibernate生成的ＳＱＬ語言，一般在調試階段設爲true,完成後再改成false，這樣有利於調試。
(3) <mapping >資源文件映射