小编Don*_*tis的帖子

我有这个参数来下载XML文件:

wget --http-user=user --http-password=pass http://www.example.com/file.xml

我如何在php中使用它来打开这个xml文件？

我有10万多行的表,我想在教义中选择所有这些,并在每行中执行一些操作,在symfony2中使用doctrine我尝试使用此查询:

    $query = $this->getDefaultEntityManager()
        ->getRepository('AppBundle:Contractor')
        ->createQueryBuilder('c')
        ->getQuery()->iterate();

    foreach ($query as $contractor) {
        // doing something
    }

但后来我得到内存泄漏,因为我认为它在内存中写入了所有数据.

当我这样做时,我在ADOdb中有更多的经验,在那个库中:

$result = $ADOdbObject->Execute('SELECT * FROM contractors');
   while ($arrRow = $result->fetchRow()) {
        // do some action
   }

我没有任何内存泄漏.

那么如何从表中选择所有数据并且不会在symfony2中使用doctrine获取内存泄漏？

问题编辑

当我尝试删除foreach并且只是迭代时,我也会遇到内存泄漏:

$query = $this->getDefaultEntityManager()
            ->getRepository('AppBundle:Contractor')
            ->createQueryBuilder('c')
            ->getQuery()->iterate();

您好我尝试做了多线程JSOUP和JPA解析一些网页,并把信息在数据库中,但我有时会收到此异常:

Exception in thread "Thread-7" Local Exception Stack: 
Exception [EclipseLink-2004] (Eclipse Persistence Services - 2.3.2.v20111125-r10461): org.eclipse.persistence.exceptions.ConcurrencyException
Exception Description: A signal was attempted before wait() on ConcurrencyManager. This normally means that an attempt was made to 
commit or rollback a transaction before it was started, or to rollback a transaction twice.
    at org.eclipse.persistence.exceptions.ConcurrencyException.signalAttemptedBeforeWait(ConcurrencyException.java:84)
    at org.eclipse.persistence.internal.helper.ConcurrencyManager.releaseReadLock(ConcurrencyManager.java:489)
    at org.eclipse.persistence.internal.identitymaps.CacheKey.releaseReadLock(CacheKey.java:386)
    at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.cloneAndRegisterObject(UnitOfWorkImpl.java:1015)
    at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildWorkingCopyCloneNormally(ObjectBuilder.java:731)
    at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObjectInUnitOfWork(ObjectBuilder.java:668)
    at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObject(ObjectBuilder.java:601)
    at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObject(ObjectBuilder.java:560)
    at org.eclipse.persistence.queries.ObjectLevelReadQuery.buildObject(ObjectLevelReadQuery.java:717)
    at org.eclipse.persistence.queries.ReadAllQuery.registerResultInUnitOfWork(ReadAllQuery.java:769)
    at org.eclipse.persistence.queries.ReadAllQuery.executeObjectLevelReadQuery(ReadAllQuery.java:433)
    at org.eclipse.persistence.queries.ObjectLevelReadQuery.executeDatabaseQuery(ObjectLevelReadQuery.java:1081)
    at org.eclipse.persistence.queries.DatabaseQuery.execute(DatabaseQuery.java:844) …

我有这个HTML代码:

<div class="category" id="154"> Category </div>

<div class="category2" id="156"> Category2 </div>

<div class="category3" id="157"> Category3 </div>

<div class="category4" id="158"> Category4 </div>
<input type="text" />

因此,在示例中,如果我在文本框中编写id,如何选择具有此ID的div .category并获取内部HTML文本.用jQuery

我有MySQL表:

table
| ID | col1 | col2 | col 3|
  1      1      0      1
  2      0      1      1
  3      1      1      1

如何将一列中的所有col1,col2,col3计数到这样的每一行？

table
| ID | colnew |
  1      2      
  2      2    
  3      3

谢谢.