persistence.xml 4.09 KB
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<persistence
    version="2.1"
    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">
    
    <!-- 
         The <code>persistence.xml</code> file configures at least one persistence unit;
         each unit must have a unique name.
    -->
    <persistence-unit name = "strategy_drop-and-create">
        
        <!-- 
            Hibernate will scan your classpath for mapped classes and add them automatically
            to your persistence unit.
        -->
        <exclude-unlisted-classes>false</exclude-unlisted-classes>
        
        <!-- 
            setting the previous option "exclude-unlisted-classes" to 'true' requires entity classes to
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            be listed explicitly. You may want to uncomment the following definition and add more classes.
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            <class>sda1.Airline</class>
        -->
        
        <!-- 
            Standard or vendor-specific options can be set as properties on a persistence unit.
            Any standard properties have the <code>javax.persistence</code> name prefix, Hibernate's
            settings use <code>hibernate</code>
        -->
        <properties>
            <!-- 
                JDBC database connection parameter
            -->
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            <property name = "javax.persistence.jdbc.driver" value="org.postgresql.Driver"/>
            <property name = "javax.persistence.jdbc.url" value="jdbc:postgresql://localhost/hdm"/>
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            <property name = "javax.persistence.jdbc.user" value="hdmuser"/>
            <property name = "javax.persistence.jdbc.password" value="XYZ"/>
            
            <!-- 
                The JPA engine should drop and re-create the SQL schema in the database
                automatically when it boots. This is ideal for automated testing, when
                you want to work with a clean database for every test run.
            -->
            <property
                name = "javax.persistence.schema-generation.database.action"
                value="drop-and-create"/>
            
            <!-- 
                When printing SQL in logs, let Hibernate format the SQL nicely and generate
                comments into the SQL string so we know why Hibernate executed the SQL statement.
            -->
            <property name = "hibernate.show_sql" value = "true" />
            <property name = "hibernate.format_sql" value="true"/>
            <property name = "hibernate.use_sql_comments" value="true"/>

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            <property name = "hibernate.dialect" value="org.hibernate.dialect.PostgreSQL95Dialect" />
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            <!-- Enable Hibernate scanning for entity classes and adding them automatically
                but not for hbm.xml files. -->
            <property name = "hibernate.archive.autodetection" value="class"/>

        </properties>
    </persistence-unit>
    
    <!-- The subsequent persistence unit won't modify the database's schema 
        javax.persistence.schema-generation.database.action=none
        -->
    <persistence-unit name = "strategy_none">
        
        <exclude-unlisted-classes>false</exclude-unlisted-classes>
        
        <properties>
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            <property name = "javax.persistence.jdbc.driver" value="org.postgresql.Driver"/>
            <property name = "javax.persistence.jdbc.url" value="jdbc:postgresql://localhost/hdm"/>
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            <property name = "javax.persistence.jdbc.user" value="hdmuser"/>
            <property name = "javax.persistence.jdbc.password" value="XYZ"/>
            
            <property
                name = "javax.persistence.schema-generation.database.action"
                value="none"/>
            
            <property name = "hibernate.show_sql" value = "false" />
            <property name = "hibernate.format_sql" value="true"/>
            <property name = "hibernate.use_sql_comments" value="true"/>
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            <property name = "hibernate.archive.autodetection" value="class"/>
            
        </properties>
    </persistence-unit>
    
</persistence>