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Re: database access [message #174194 is a reply to message #174190]

Thu, 26 May 2011 12:09

sheldonlg
Messages: 166
Registered: September 2010

Karma:

Senior Member

On 5/25/2011 5:37 PM, Jerry Stuckle wrote:
> On 5/25/2011 1:17 PM, Jivanmukta wrote:
>> I new relatively new to PHP. I need your opinion if the following set
>> of database functions make sense:
>>
>> function openDatabase() {
>> global $db;
>> try {
>> $db = new PDO('mysql:host=' . MYSQL_SERVER . ';dbname=' .
>> MYSQL_DATABASE, MYSQL_USER, MYSQL_PASSWORD);
>> $db->exec('SET NAMES latin2');
>> $db->exec('SET CHARACTER SET latin2 COLLATE latin2_general_ci');
>> $db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
>> register_shutdown_function('closeDatabase');
>> } catch (PDOException $e) {
>> return false;
>> }
>> return true;
>> }
>>
>> function closeDatabase() {
>> global $db, $inTransaction;
>> if ($inTransaction) {
>> $db->rollBack();
>> $inTransaction = false;
>> }
>> if (!is_null($db)) {
>> $db = null;
>> }
>> }
>>
>> function queryDatabase($sql) {
>> global $db, $inTransaction;
>> $result = array();
>> try {
>> $qry = $db->query($sql);
>> if (!empty($qry)) {
>> $result = $qry->fetchAll();
>> }
>> } catch (PDOException $e) {
>> if ($inTransaction) {
>> $db->rollBack();
>> }
>> error(ERRMSG_DATABASE_OPERATION_FAILED);
>> }
>> return $result;
>> }
>>
>> function execDatabase($sql) {
>> global $db, $inTransaction;
>> $result = array();
>> try {
>> $result = $db->exec($sql);
>> } catch (PDOException $e) {
>> if ($inTransaction) {
>> $db->rollBack();
>> }
>> error(ERRMSG_DATABASE_OPERATION_FAILED);
>> }
>> return $result;
>> }
>>
>> function startTransaction() {
>> global $db, $inTransaction;
>> $db->beginTransaction();
>> $inTransaction = true;
>> }
>>
>> function commitTransaction() {
>> global $db, $inTransaction;
>> $inTransaction = false;
>> if ($db->commit()) {
>> return;
>> }
>> $db->rollBack();
>> error(ERRMSG_DATABASE_OPERATION_FAILED);
>> }
>>
>> function rollbackTransaction() {
>> global $db, $inTransaction;
>> $inTransaction = false;
>> if ($db->rollBack()) {
>> return;
>> }
>> error(ERRMSG_DATABASE_OPERATION_FAILED);
>> }
>>
>> function lockTables($tables) {
>> return execDatabase('LOCK TABLES ' . join(' WRITE, ', $tables) . '
>> WRITE');
>> }
>>
>> function unlockTables() {
>> return execDatabase('UNLOCK TABLES');
>> }
>
> Kind of, and maybe a bit overkill. But personally I'd put it all in a
> Database class. The code would be more flexible and less prone to errors.
>

Further, I would not have globals. I would pass $db in via the
constructor. Likewise, I would have $inTransaction be a class variable
which gets set by the method startTransaction().

--
Shelly

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[Message index]

		database access By: Jivanmukta on Wed, 25 May 2011 17:17
		Re: database access By: Jerry Stuckle on Wed, 25 May 2011 21:37
		Re: database access By: sheldonlg on Thu, 26 May 2011 12:09
		Re: database access By: Jerry Stuckle on Thu, 26 May 2011 13:00
		Re: database access By: sheldonlg on Thu, 26 May 2011 14:22
		Re: database access By: Jerry Stuckle on Thu, 26 May 2011 15:41
		Re: database access By: sheldonlg on Thu, 26 May 2011 16:07
		Re: database access By: sheldonlg on Thu, 26 May 2011 16:14
		Re: database access By: sophal chao on Sun, 29 May 2011 20:41
		Re: database access By: Jerry Stuckle on Mon, 30 May 2011 03:12
		Re: database access By: JohnT on Thu, 26 May 2011 13:05
		Re: database access By: Jivanmukta on Thu, 26 May 2011 13:37
		Re: database access By: sheldonlg on Thu, 26 May 2011 14:30
		Re: database access By: sheldonlg on Thu, 26 May 2011 14:33
		Re: database access By: Jerry Stuckle on Thu, 26 May 2011 15:43
		Re: database access By: Michael Fesser on Thu, 26 May 2011 17:48
		Re: database access By: Erwin Moller on Mon, 30 May 2011 08:56

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