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Only make a single database connection per host, and keep them persistent

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This commit is contained in:
kaetemi 2014-09-03 03:51:11 +02:00
parent 379e04dc25
commit 011869167d
1 changed files with 42 additions and 27 deletions
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69
code/web/private_php/ams/autoload/dblayer.php
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@ -29,11 +29,14 @@
*
*/
//$PDOCache = array();
$PDOCache = array();
class DBLayer {
private $PDO;
private $host;
private $dbname;
/**
* The PDO object, instantiated by the constructor
*/
@ -47,32 +50,43 @@ class DBLayer {
*/
function __construct($db, $dbn = null)
{
/*global $PDOCache;
if (isset($PDOCache[$db])) {
$this->PDO = $PDOCache[$db];
} else {*/
global $cfg;
global $cfg;
$this->host = $cfg['db'][$db]['host'];
$this->dbname = $cfg['db'][$db]['name'];
global $PDOCache;
if (isset($PDOCache[$this->host])) {
$this->PDO = $PDOCache[$this->host]['pdo'];
} else {
$dsn = "mysql:";
$dsn .= "host=" . $cfg['db'][$db]['host'] . ";";
$dsn .= "dbname=" . $cfg['db'][$db]['name'] . ";";
// $dsn .= "dbname=" . $cfg['db'][$db]['name'] . ";";
$dsn .= "port=" . $cfg['db'][$db]['port'] . ";";
//$dsn .= "charset=utf8;";
$opt = array(
PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
PDO::ATTR_PERSISTENT => false
PDO::ATTR_PERSISTENT => true
);
$this->PDO = new PDO($dsn, $cfg['db'][$db]['user'], $cfg['db'][$db]['pass'], $opt);
//$PDOCache[$db] = $this->PDO;
/*}*/
$PDOCache[$this->host] = array();
$PDOCache[$this->host]['pdo'] = $this->PDO;
$PDOCache[$this->host]['use'] = $this->dbname;
$this->PDO->query('USE ' . $this->dbname . ';'); // FIXME safety
}
}
function __destruct() {
//$this->PDO->query('KILL;');
$this->PDO = NULL;
}
function useDb() {
global $PDOCache;
if ($PDOCache[$this->host]['use'] != $this->dbname) {
$PDOCache[$this->host]['use'] = $this->dbname;
$this->PDO->query('USE ' . $this->dbname . ';'); // FIXME safety
}
}
/**
* Execute a query that doesn't have any parameters.
*
@ -80,6 +94,7 @@ class DBLayer {
* @return returns a PDOStatement object.
*/
public function executeWithoutParams($query) {
$this->useDb();
$statement = $this->PDO->prepare($query);
$statement->execute();
return $statement;
@ -93,6 +108,7 @@ class DBLayer {
* @return returns a PDOStatement object.
*/
public function execute( $query, $params ) {
$this->useDb();
$statement = $this -> PDO -> prepare( $query );
$statement -> execute( $params );
return $statement;
@ -106,6 +122,7 @@ class DBLayer {
* @return returns the id of the last inserted element.
*/
public function executeReturnId( $tb_name, $data ) {
$this->useDb();
$field_values = ':' . implode( ',:', array_keys( $data ) );
$field_options = implode( ',', array_keys( $data ) );
try {
@ -138,8 +155,8 @@ class DBLayer {
* @param string $where where to select.
* @return statement object.
*/
public function selectWithParameter( $param, $tb_name, $data, $where )
{
public function selectWithParameter( $param, $tb_name, $data, $where ) {
$this->useDb();
try {
$sth = $this -> PDO -> prepare( "SELECT $param FROM $tb_name WHERE $where" );
$this -> PDO -> beginTransaction();
@ -163,8 +180,8 @@ class DBLayer {
* @param string $where where to select in format('fieldname=:fieldname' AND ...).
* @return statement object.
*/
public function select( $tb_name, $data , $where )
{
public function select( $tb_name, $data , $where ) {
$this->useDb();
try {
$sth = $this -> PDO -> prepare( "SELECT * FROM $tb_name WHERE $where" );
$this -> PDO -> beginTransaction();
@ -188,8 +205,8 @@ class DBLayer {
* @param string $where where part in format ('fieldname'= $value AND ...). 'fieldname' must be a field in that table.
* @throws Exception error in updating.
*/
public function update( $tb_name, $data, $where )
{
public function update( $tb_name, $data, $where ) {
$this->useDb();
$field_option_values = null;
foreach ( $data as $key => $value )
{
@ -223,8 +240,8 @@ class DBLayer {
* @param array $data array of data to insert in format('fieldname' => $value,....). 'fieldname' must be a field in that table.
* @throws error in inserting.
*/
public function insert( $tb_name, $data )
{
public function insert( $tb_name, $data ) {
$this->useDb();
$field_values = ':' . implode( ',:', array_keys( $data ) );
$field_options = implode( ',', array_keys( $data ) );
try {
@ -256,19 +273,17 @@ class DBLayer {
* @param string $where condition based on $data array in the format('fieldname=:fieldname' AND ...).
* @throws error in deleting.
*/
public function delete( $tb_name, $data, $where )
{
public function delete( $tb_name, $data, $where ) {
$this->useDb();
try {
$sth = $this -> PDO -> prepare( "DELETE FROM $tb_name WHERE $where" );
$this -> PDO -> beginTransaction();
$sth -> execute( $data );
$this -> PDO -> commit();
}
catch ( Exception $e )
{
}
catch (Exception $e) {
$this -> PDO -> rollBack();
throw new Exception( "error in deleting" );
}
}
}
}