public class CpiDaoBase {
protected Connection con = null;
public void test(){
cpiDAOBase.openDbConnection();
ps = new cpiDAOBase().con.prepareStatement(INSERT_CARRIER);
ps.executeQuery();
... blah blah blah
}
public void openDbConnection() throws CpiSystemException
{
try {
if (con == null || con.isClosed()) {
con = CpiDataSource.getNonTxConnection();
}
} catch (SQLException e) {
log.error(e.getMessage(), e);
new CpiSystemException("SQLException caused by con.isClosed(): " + e.getMessage());
}
}
}
public class CpiDataSource {
public static Connection getNonTxConnection() throws CpiSystemException {
try {
if (nonTxDs == null)
{
if(log.isDebugEnabled()){
log.debug("nonTxDs is null");
}
init();
}
return nonTxDs.getConnection();
} catch (NamingException e)
{
log.error("cpiPoolDataSource is not available !" + e);
throw new CpiSystemException("cpiPoolDataSource is not available !");
} catch (SQLException e)
{
log.error("Failed to get connection from datasource !" + e);
throw new CpiSystemException("Failed to get connection from datasource !");
} catch (Exception e)
{
log.error("Exception \n" + e);
throw new CpiSystemException(e.getMessage());
}
}
}
我得到以下异常:值java.sql.SQLException:语句已经关闭
值java.sql.SQLException:语句已经关闭] [[活动] ExecuteThread: '8' for queue:'weblogic.kernel.Default(self-tuning)'] [2014-10-28 05:54:17,918] [错误] [com.uprr.app.cpi.dao.CpiCustomerPipelinePreferencesDao:104] [SQL Exception : java.sql.SQLException:executeQuery,Exception = null] [[ACTIVE] ExecuteThread:'5'for queue:'weblogic.kernel.Default(self-tuning)'] [2014-10-28 05:54: 17,918] [错误] [com.uprr.app.cpi.web.action。 PatternSelectionAction:112] [在访问CPI_CUST_PILN_PREF表时获得SQLException:executeQuery,Exception = null] [[ACTIVE] ExecuteThread:'5'for队列:'weblogic.kernel.Default(self-tuning)']
我的疑问很简单,但我很困惑:
从上面的代码我使用本地连接对象或全球?请建议。
我同意你的第一句话。然而,由于从OP的代码示例中不清楚cpiDAOBase是一个变量,一个字段还是一个类,它不同于他声明的类名“CpiDaoBase”,我不太确定代码*应该是什么*是。 – RealSkeptic 2014-10-28 14:22:56
@RealSkeptic也许*看起来像它*应该注意,'openDbConnection();'似乎设置了一个本地'Connection con'字段。 – 2014-10-28 14:28:01