persistence

部分/META-INF/persistence.xml

---

<?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_2_0.xsd"
    version="2.0">
    
    <!-- 要求至少得有一个持久化单元(至少得有一个数据库的连接信息) -->
    <persistence-unit name="mysql">
            <!-- mysql的数据库连接信息 -->
            <properties>
                <property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver"/>
                <property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/jpa"/>
                <property name="hibernate.connection.username" value="root"/>
                <property name="hibernate.connection.password" value="1234"/>
                <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/>
                
                <property name="hibernate.connection.provider_class" value="org.hibernate.connection.C3P0ConnectionProvider"/>
                <property name="hibernate.show_sql" value="true"/>
                <property name="hibernate.format_sql" value="true"/>
                <property name="hibernate.hbm2ddl.auto" value="update"/>
            
            </properties>
    </persistence-unit>
    
    
    
    
    <!-- <persistence-unit name="oracle">
            oracle的数据库连接信息
    </persistence-unit>
    
    
    <persistence-unit name="db2">
            db2的数据库连接信息
    </persistence-unit> -->
    
</persistence>