混合jpa和jdbc集成测试时Connection第二次执行sql时被关闭原因及解决方案

在继承AbstractTransactionalJUnit4SpringContextTests 并使用如下代码进行集成测试时：

    @Before
    public void setUp() {
        setSqlScriptEncoding("utf-8");
        executeSqlScript("classpath:sql/intergration-test-data.sql", false);
    }

 可能得到如下异常：

写道

20:53:42.375 [main] WARN o.s.j.support.SQLErrorCodesFactory - Error while extracting database product name - falling back to empty error codes
org.springframework.jdbc.support.MetaDataAccessException: Error while extracting DatabaseMetaData; nested exception is java.sql.SQLException: Couldn't perform the operation getMetaData: You can't perform a getMetaData operation after the connection has been closed

写道

org.springframework.jdbc.UncategorizedSQLException: StatementCallback; uncategorized SQLException for SQL [delete from `sys_job`]; SQL state [null]; error code [0]; Couldn't perform the operation createStatement: You can't perform a createStatement operation after the connection has been closed; nested exception is java.sql.SQLException: Couldn't perform the operation createStatement: You can't perform a createStatement operation after the connection has been closed
at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:83)
at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:80)
at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:80)
at org.springframework.jdbc.core.Jdb

这是因为内部的JdbcTemplate在调用DataSourceUtils.releaseConnection(con, getDataSource());释放连接时，是调用的：org.springframework.orm.jpa.vendor.HibernateJpaDialect的HibernateConnectionHandle

		public void releaseConnection(Connection con) {
			JdbcUtils.closeConnection(con);
		}

    public static void closeConnection(Connection con) {
		if (con != null) {
			try {
				con.close();
			}
			catch (SQLException ex) {
				logger.debug("Could not close JDBC Connection", ex);
			}
			catch (Throwable ex) {
				// We don't trust the JDBC driver: It might throw RuntimeException or Error.
				logger.debug("Unexpected exception on closing JDBC Connection", ex);
			}
		}
	}

  

即con.close();直接关闭连接。

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此时我们应该使用TransactionAwareDataSourceProxy代理之：

<bean id="dataSource" class="org.springframework.jdbc.datasource.TransactionAwareDataSourceProxy">
        <property name="targetDataSource">
            <bean class="org.logicalcobwebs.proxool.ProxoolDataSource">
                <property name="driver" value="${connection.driver_class}"/>
                <property name="driverUrl" value="${connection.url}"/>
                <property name="user" value="${connection.username}"/>
                <property name="password" value="${connection.password}"/>

                <property name="alias" value="${proxool.alias}"/>
                <property name="trace" value="${proxool.trace}"/>
                <property name="maximumConnectionCount" value="${proxool.maximum.connection.count}"/>
                <property name="minimumConnectionCount" value="${proxool.minimum.connection.count}"/>
                <property name="statistics" value="${proxool.statistics}"/>
                <property name="simultaneousBuildThrottle" value="${proxool.simultaneous.build.throttle}"/>
            </bean>
        </property>
    </bean>

此时在调用DataSources.doGetConnection获取ConnectionHolder时，内部使用SimpleConnectionHandle而非HibernateConnectionHandle，即releaseConnection并没有释放连接：

        public void releaseConnection(Connection con) {
 	}

 即此时并没有真正关闭实际的连接。 

即谁打开的连接谁负责关闭。