ejb3.0 中資料庫的配置

persistence.xml中的資料為：

<?xml version="1.0" encoding="UTF-8"?><persistence xmlns="http://java.sun.com/xml/ns/persistence"    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    xsi:schemaLocation="http://java.sun.com/xml/ns/persistence    http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd" version="1.0">    <persistence-unit name="EJBJPAPU" transaction-type="JTA">    <jta-data-source>java:/MySqlDS</jta-data-source>    <properties>             <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/>             <property name="hibernate.hbm2ddl.auto" value="update"/>      </properties> </persistence-unit>  </persistence>

jpa底層使用的是hibernate來實現的，所以有properties的配置。

mysql-ds.xml:

 <jndi-name>MySqlDS</jndi-name>    <connection-url>jdbc:mysql://localhost:3306/ejb3</connection-url>    <driver-class>com.mysql.jdbc.Driver</driver-class>    <user-name>root</user-name>    <password>root</password>

此檔案一定要放置到伺服器的deploy目錄中。

把mysql的jar包放置到伺服器中的lib目錄中。

jboss-4.2.3/server/default/lib;