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<?php
/**
*
* PgDB - future unified database access interface,
* currently only wrapping some global functions
*/
// temporary workaround until new configuration framework will be in place.
class PgDB {
static private $_db = null;
static private $_master_db = null;
static private $_slave_db = null;
// counts how many times transaction has been started
static private $_transaction_depth = 0;
// states if current transaction has been rolled back at some point
static private $_transaction_failed = false;
static private $_config = null;
static private $_me = null;
/**
* Private constructor prevents multiple objects creation.
* Guarantees singleton pattern usage of class.
*/
private function __construct() {
}
/**
* returns object providing access to master database PDO functions
* \return object behaving like PDO Database object
*/
static function db() {
self::_needsMasterDB();
if (self::$_me == null) {
self::$_me = new PgDB();
}
return self::$_me;
}
/**
* Mapping method - thanks to it PgDB object behaves like PDO
*
* @param funcname PDO function to be mapped
* @param args array of PDO function arguments
* @return PDO function response
*/
public function __call($funcname, $args) {
return call_user_func_array([self::$_db,$funcname],$args);
}
/**
* Declares database dependency, establishes connection if needed.
* Guarantees availablility of master connection.
*/
static private function _needsMasterDB() {
self::$_db = &self::$_master_db;
if (self::$_db == null) {
self::_masterConnect();
}
}
static private function _getConfig($key, $default = '') {
if (self::$_config === NULL) {
self::$_config = Env::get('db');
}
if (isset(self::$_config[$key])) {
return self::$_config[$key];
}
return $default;
}
/**
* Establishes connection to master server
* (currently there's no multimaster support available).
*/
static private function _masterConnect() {
self::$_master_db = new PDO('pgsql:host='.self::_getConfig('host').';port='.self::_getConfig('port', 5432).';dbname='.self::_getConfig('database').'', self::_getConfig('user'), self::_getConfig('password'));
self::$_master_db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
self::$_db = &self::$_master_db;
}
/** returns value from first column of first row of query result.
* accepts two types of variable substitution: '?' or ':var',
* '?' expects variable parameter list, ':var' expects second argument
* to be array working as dictionary
* \param $query PgSQL query with optional parameter substitution
* \param $params (optional) array or first parameter for '?' type query
* \param $... - (optional) following parameters for '?' type query
*/
public static function fetchValue($query, $params = []) {
self::_needsMasterDB();
$sth = self::$_db->prepare($query.';');
if (!is_array($params)) {
$params = array_slice(func_get_args(),1);
}
$sth->execute($params);
$result = $sth->fetch(PDO::FETCH_NUM);
return isset($result[0]) ? $result[0] : null;
}
/** returns first first row of query result as assiociative array.
* accepts two types of variable substitution: '?' or ':var',
* '?' expects variable parameter list, ':var' expects second argument
* to be array working as dictionary
* \param $query PgSQL query with optional parameter substitution
* \param $params (optional) array or first parameter for '?' type query
* \param $... - (optional) following parameters for '?' type query
*/
public static function fetchRow($query, $params = []) {
self::_needsMasterDB();
$sth = self::$_db->prepare($query.';');
if (!is_array($params)) {
$params = array_slice(func_get_args(),1);
}
$sth->execute($params);
return $sth->fetch(PDO::FETCH_ASSOC);
}
/** returns whole query result as numbered array of assiociative arrays.
* accepts two types of variable substitution: '?' or ':var',
* '?' expects variable parameter list, ':var' expects second argument
* to be array working as dictionary
* \param $query PgSQL query with optional parameter substitution
* \param $params (optional) array or first parameter for '?' type query
* \param $... - (optional) following parameters for '?' type query
*/
static public function fetchAll($query, $params = []) {
self::_needsMasterDB();
$sth = self::$_db->prepare($query.';');
if (!is_array($params)) {
$params = array_slice(func_get_args(),1);
}
$sth->execute($params);
return $sth->fetchAll(PDO::FETCH_ASSOC);
}
static public function execute($query, $params = []) {
self::_needsMasterDB();
$sth = self::$_db->prepare($query.';');
if (!is_array($params)) {
$params = array_slice(func_get_args(),1);
}
$sth->execute($params);
return $sth->rowCount();
}
static public function insert($table, $values, $functions = []) {
self::_needsMasterDB();
list($query,$args) = self::_insert_prepare($table,$values,$functions);
$sth = self::$_db->prepare($query.';');
$sth->execute($args);
return $sth->rowCount();
}
static public function update($table,$values,$whereclause,$functions="") {
self::_needsMasterDB();
$query = 'UPDATE "'. $table .'" SET ';
$cnt=0;
$where = "";
$args = [];
foreach ($values as $key => $val) {
if ($cnt) {
$query .=', ';
}
$query .= '"'. $key .'"=?';
if (is_bool($val)) {
$args[] = ($val) ? 'TRUE' : 'FALSE';
}
else {
$args[] = $val;
}
$cnt++;
}
if ($functions!="") {
foreach ($functions as $key => $val) {
if ($cnt) {
$query .=', ';
}
$query .= '"'. $key .'"'. $val;
$cnt++;
}
}
if (empty($values)) {
$query = 'SELECT * FROM '.$table;
}
if (is_array($whereclause)) {
$cnt=0;
foreach ($whereclause as $key => $val) {
if ($cnt) {
$where .=' AND ';
}
$where .= '("'. $key .'"=?)';
$args[] = $val;
$cnt++;
}
$query .= " WHERE ".$where .";";
}
else {
$query .= " WHERE ". $whereclause .";";
}
$sth = self::$_db->prepare($query.';');
$sth->execute($args);
return $sth->rowCount();
}
public static function set($table,$values,$wherelist,$functions = []) {
$rowsAffected = self::update($table,$values,$wherelist,$functions);
if ($rowsAffected == 0) {
return self::insert($table,array_merge($values,$wherelist),$functions);
}
return $rowsAffcted;
}
public static function delete($table, $values, $extrarules="") {
$query = 'DELETE FROM "'. $table .'" WHERE ';
$cnt=0;
$args = [];
foreach ($values as $key => $val) {
if ($cnt) {
$query .= 'AND';
}
$query .= ' ("'. $key .'" = ?)';
$args[] = $val;
$cnt++;
}
if ($extrarules !== "") {
$query .= ' AND '.$extrarules;
}
return self::execute($query,$args);
}
static private function _insert_prepare($table,$values,$functions = []) {
$query = 'INSERT INTO "'. $table .'"(';
$cnt=0;
$valbuf = "";
$args = [];
foreach ($values as $key => $val) {
if ($cnt) {
$query .=',';
$valbuf.=',';
}
$query .= '"'. $key .'"';
$valbuf .= '?';
if (is_bool($val)) {
$args[] = ($val) ? 'TRUE' : 'FALSE';
}
elseif ($val===null) {
$args[] = NULL;
}
else {
$args[] = $val;
}
$cnt++;
}
foreach ($functions as $key => $val) {
if ($cnt) {
$query .=',';
$valbuf .=',';
}
$query .= '"'. $key .'"';
$valbuf .= $val;
$cnt++;
}
$query .= ") VALUES (". $valbuf .");";
return [$query, $args];
}
public static function begin() {
self::_needsMasterDB();
if (self::$_transaction_depth == 0) {
self::$_db->beginTransaction();
self::$_transaction_depth++;
}
elseif (self::$_transaction_failed) {
throw new Exception("Trying to begin transaction inside of already stopped transaction!");
}
else {
self::$_transaction_depth++;
}
}
public static function commit() {
if (self::$_transaction_depth>0) {
if (self::$_transaction_failed) {
// I'm not convinced that it's good idea,
// but we need to be sure transaction won't go to database.
self::rollback();
throw new Exception("Transaction already stopped, couldn't be commited");
}
self::$_transaction_depth--;
if (self::$_transaction_depth==0) {
return self::$_db->commit();
}
}
else {
throw new Exception("To commit transaction it needs to be started first");
}
}
public static function rollback() {
self::$_transaction_failed = true;
self::$_transaction_depth--;
if (self::$_transaction_depth == 0) {
self::$_db->rollback();
self::$_transaction_failed = false;
}
}
public static function inTransaction() {
return (self::$_transaction_depth>0);
}
public static function transactionStateFailed() {
return self::$_transaction_failed;
}
}
?>
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