javaDB数据源的配置

javaDB数据库是java自带的数据库，就是原来的derby数据库，用于测试或者小型应用，完全应付自如。最重要的是随手就能用，不用太多的安装配置，可以吧更多的精力花在核心问题上，利于学习和开发测试。以下是个配置例子：

<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://xmlns.jcp.org/xml/ns/persistence"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd"
             version="2.1">

    <persistence-unit name="users">
    <provider>org.hibernate.ejb.HibernatePersistence</provider>
    <class>cn.jhc.bean.Employee</class>
        <properties>
            <property name="hibernate.dialect" value="org.hibernate.dialect.DerbyDialect" />
            <property name="hibernate.connection.driver_class" value="org.apache.derby.jdbc.EmbeddedDriver" />
            <property name="hibernate.connection.url" value="jdbc:derby:F:\YcApp\javaDB\test;create=true;user=test;password=test" />
            <property name="hibernate.connection.password" value="test"></property>
            <property name="hibernate.connection.username" value="test"></property>
            <property name="hibernate.default_schema" value="test"></property>
            <property name="hibernate.hbm2ddl.auto" value="create" />
            <property name="hibernate.show_sql" value="true" />
            <property name="hibernate.format_sql" value="true"/>
            <property name="hibernate.hbm2ddl.import_files" value="/sql/populate.sql"/>
        </properties>
    </persistence-unit>
   

  
</persistence>
这里要使用依赖项：derby.jar，在jdk\db\lib下，java7以后自带。