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PHP:oci_close()的用法_Oracle函数(php occ)
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(PHP 5, PECL OCI8 >= 1.1.0)
oci_close — 关闭 Oracle 连接
说明 bool oci_close ( resource $connection )oci_close() 将 Oracle 连接 connection 关闭。
Note:
自版本 1.1 起 oci_close() 正确关闭 Oracle 连接。使用 oci8.old_oci_close_semantics 选项来恢复本函数的旧行为。
成功时返回 TRUE， 或者在失败时返回 FALSE。
Note:
在 PHP 5.0.0 之前的版本必须使用 ocilogoff() 替代本函数。该函数名仍然可用，为向下兼容作为 oci_close() 的别名。不过其已被废弃，不推荐使用。
参数connection
An Oracle connection identifier returned by oci_connect(), oci_pconnect(), or oci_new_connect().
返回值成功时返回 TRUE， 或者在失败时返回 FALSE。
范例Example #1 Closing a connection
Resources associated with a connection should be closed to ensure the underlying database connection is properly terminated and the database resources are released.
<?php$conn=oci_connect('hr','welcome','localhost/XE');if(!$conn){$e=oci_error();trigger_error(htmlentities($e['message'],ENT_QUOTES),E_USER_ERROR);}$stid=oci_parse($conn,'SELECT*FROMdepartments');$r=oci_execute($stid);oci_fetch_all($stid,$res);var_dump($res);//Freethestatementidentifierwhenclosingtheconnectionoci_free_statement($stid);oci_close($conn);?>
Example #2 Database connections are not closed until all references are closed
The internal refcount of a connection identifier must be zero before the underlying connection to the database is closed.
<?php$conn=oci_connect('hr','welcome','localhost/XE');if(!$conn){$e=oci_error();trigger_error(htmlentities($e['message'],ENT_QUOTES),E_USER_ERROR);}$stid=oci_parse($conn,'SELECT*FROMdepartments');//thisincreasestherefcounton$connoci_execute($stid);oci_fetch_all($stid,$res);var_dump($res);oci_close($conn);//$connisnolongusableinthescriptbuttheunderlyingdatabase//connectionisstillheldopenuntil$stidisfreed.var_dump($conn);//printsNULL//WhilePHPsleeps,queryingtheOracleV$SESSIONviewina//terminalwindowwillshowthatthedatabaseuserisstillconnected.sleep();//When$stidisfreed,thedatabaseconnectionisphysicallyclosedoci_free_statement($stid);//WhilePHPsleeps,queryingtheOracleV$SESSIONviewina//terminalwindowwillshowthatthedatabaseuserhasdisconnected.sleep();?>Example #3 Closing a connection opened more than once
When database credentials are reused, both connections must be closed before the underlying database connection is closed.
<?php$conn1=oci_connect('hr','welcome','localhost/XE');//Usingthesamecredentialsreusesthesameunderlyingdatabaseconnection//Anyuncommittedchangesdoneon$conn1willbevisiblein$conn2$conn2=oci_connect('hr','welcome','localhost/XE');//WhilePHPsleeps,queryingtheOracleV$SESSIONviewina//terminalwindowwillshowthatonlyonedatabaseuserisconnected.sleep();oci_close($conn1);//doesn'tclosetheunderlyingdatabaseconnectionvar_dump($conn1);//printsNULLbecausethevariable$conn1isnolongerusablevar_dump($conn2);//displaysthat$conn2isstillavalidconnectionresource?>Example #4 Connections are closed when variables go out of scope
When all variables referencing a connection go out of scope and are freed by PHP, a rollback occurs (if necessary) and the underlying connection to the database is closed.
<?phpfunctionmyfunc(){$conn=oci_connect('hr','hrpwd','localhost/XE');if(!$conn){$e=oci_error();trigger_error(htmlentities($e['message'],ENT_QUOTES),E_USER_ERROR);}$stid=oci_parse($conn,'UPDATEmytabSETid=');oci_execute($stid,OCI_NO_AUTO_COMMIT);return"Finished";}$r=myfunc();//Atthispointarollbackoccurredandtheunderlyingdatabaseconnectionwasreleased.print$r;//displaysthefunctionreturnvalue"Finished"?> 注释Note:
Variables that have a dependency on the connection identifier, such as statement identifiers returned by oci_parse(), must also be freed before the underlying database connection is closed.
Note:
Prior to version PHP 5.1.2 (PECL OCI8 1.1) oci_close() was a no-op. In more recent versions it correctly closes the Oracle connection. Use oci8.old_oci_close_semantics option to restore old behavior of this function.
Note:
The oci_close() function does not close the underlying database connections created with oci_pconnect().
Note:
In PHP versions before 5.0.0 you must use ocilogoff() instead. 在当前版本中，旧的函数名还可以被使用，但已经被废弃并不建议使用。
参见oci_connect() - 建立一个到 Oracle 服务器的连接 oci_free_statement() - 释放关联于语句或游标的所有资源
PHP:oci_connect()的用法_Oracle函数 oci_connect(PHP5,PECLOCI8=1.1.0)oci_connect建立一个到Oracle服务器的连接说明resourceoci_connect(string$username,string$password[,string$db[,string$charset[,int$session_mode]]])oci_connect(
PHP:oci_fetch_all()的用法_Oracle函数 oci_fetch_all(PHP5,PECLOCI8=1.1.0)oci_fetch_all获取结果数据的所有行到一个数组说明intoci_fetch_all(resource$statement,array&$output[,int$skip[,int$maxrows[,int$flags]]])oci_fetch_all()
PHP:oci_execute()的用法_Oracle函数 oci_execute(PHP5,PECLOCI8=1.1.0)oci_execute执行一条语句说明booloci_execute(resource$stmt[,int$mode])oci_execute()执行一条之前被解析过的语句（见oci_parse()）。可选参数mode
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