Question

我在嵌入式H2数据库上使用Hibernate处理Maven Spring Boot Web应用程序。应用程序部署在Tomcat 8应用程序容器上，使用Maven目标tomcat7：从Maven Tomcat插件重新部署（tomcat7-maven-plugin）。

当我第一次尝试在Tomcat上部署这个Web应用程序时，我没有异常（在Tomcat重启之后）。

但是当我尝试在Tomcat上重新部署这个Web应用程序时，我有以下例外：

org.h2.jdbc.JdbcSQLException：数据库可能已在使用中：＆＃34;已锁定通过另一个过程＆＃34;。可能的解决方案：关闭所有其他连接（一个或多个）;使用服务器模式; SQL语句： null / 14cfb969fb93251ff134953c65dd1f05db2ecd34c6b [90020-145]

hibernate.cfg.xml中

<?xml version='1.0' encoding='utf-8'?>

<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">

<hibernate-configuration>

    <session-factory>

        <!-- Database connection settings -->
        <property name="connection.driver_class">org.h2.Driver</property>
        <property name="connection.url">jdbc:h2:file:d:/Profiles/mBaye/Developement/Run/spring-boot-web-seed-dev/db/springbootwebui;DB_CLOSE_DELAY=0;MVCC=TRUE</property>
        <property name="connection.username">sa</property>
        <property name="connection.password"/>

        <!-- JDBC connection pool (use the built-in) -->
        <property name="connection.pool_size">1</property>

        <!-- SQL dialect -->
        <property name="dialect">org.hibernate.dialect.H2Dialect</property>

        <!-- Disable the second-level cache  -->
        <property name="cache.provider_class">org.hibernate.cache.internal.NoCacheProvider</property>

        <!-- Echo all executed SQL to stdout -->
        <property name="show_sql">true</property>

        <!-- Drop and re-create the database schema on startup -->
        <!-- <property name="hbm2ddl.auto">create</property> -->
        <!-- Update the database schema on startup -->
        <property name="hbm2ddl.auto">update</property>

        <mapping resource="app/Greeting.hbm.xml"/>

    </session-factory>

</hibernate-configuration>

GreetingController.java

@Controller
public class GreetingController {

    private static Logger logger ;

    // A SessionFactory is set up once for an application
    private static final SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();

    [...]

    private Greeting saveGreeting(Greeting greeting) {

        logger.info(new StringBuilder("greeting=").append(greeting.toString()).toString());

        Session session = null;
        Greeting ret = null;

        try {
            session = sessionFactory.openSession();
            session.beginTransaction();
            session.save( greeting );
            session.getTransaction().commit();
            // Return result
            ret = greeting ;
        } catch (Exception e) {
            logger.log(Level.SEVERE, new StringBuilder("Failed to save ").append(greeting.toString()).toString(), e);
        } finally {
            session.close();
        }

        if (ret != null) {
            logger.info(new StringBuilder("ret=").append(ret.toString()).toString());   
        } else {
            logger.info(new StringBuilder("ret=null").toString());
        }

        return ret ;
    }

    [...]
}

我在其他主题上读到，当VM正常退出时，数据库连接会自动关闭（来源：What is the proper way to close H2?）

我认为，当应用程序部署在Tomcat上时，Tomcat会保留数据库连接。

我想找到一种合适的方法来关闭Tomcat重新部署的所有数据库连接。

提前致谢。

Answer 1

我终于找到了解决方案！：）

我将H2数据库连接URL的设置更改为：

<property name="connection.url">jdbc:h2:file:d:/Profiles/mBaye/Developement/Run/spring-boot-web-seed-dev/db/springbootwebui;MVCC=TRUE;DB_CLOSE_ON_EXIT=TRUE;FILE_LOCK=NO</property>

<强> hibernate.cfg.xml中

<?xml version='1.0' encoding='utf-8'?>

<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">

<hibernate-configuration>

    <session-factory>

        <!-- Database connection settings -->
        <property name="connection.driver_class">org.h2.Driver</property>
        <property name="connection.url">jdbc:h2:file:d:/Profiles/mBaye/Developement/Run/spring-boot-web-seed-dev/db/springbootwebui;MVCC=TRUE;DB_CLOSE_ON_EXIT=TRUE;FILE_LOCK=NO</property>
        <property name="connection.username">sa</property>
        <property name="connection.password"/>

        <!-- JDBC connection pool (use the built-in) -->
        <property name="connection.pool_size">1</property>

        <!-- SQL dialect -->
        <property name="dialect">org.hibernate.dialect.H2Dialect</property>

        <!-- Disable the second-level cache  -->
        <property name="cache.provider_class">org.hibernate.cache.internal.NoCacheProvider</property>

        <!-- Echo all executed SQL to stdout -->
        <property name="show_sql">true</property>

        <!-- Drop and re-create the database schema on startup -->
        <!-- <property name="hbm2ddl.auto">create</property> -->
        <!-- Update the database schema on startup -->
        <property name="hbm2ddl.auto">update</property>

        <mapping resource="app/Greeting.hbm.xml"/>

    </session-factory>

</hibernate-configuration>

我不确定这是最好的解决方案，但它确实有效。

Answer 2

当所有连接都关闭时，

H2关闭数据库。关闭连接池中的所有连接对我有用。

Answer 3

关闭连接也对我有用，打开多个连接而没有意识到。

嵌入式H2：数据库的Tomcat WebApp可能已在使用中：＆＃34;被另一个进程锁定＆＃34;

3 个答案: