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<?php
/**
* PDO implementation of the database Query
* @package Database
*/
class Query_PDO_Driver extends Query_Database {
/**
* Type of the database, e.g. mysql, pgsql etc.
* @var string
* @access public
*/
protected $_db_type;
/**
* Character to use for quoting fields
* @var string
* @access public
*/
protected $_quote;
/**
* Creates a new query object, checks which driver we are using and set the character used for quoting
*
* @param DB $db Database connection
* @param string $type Query type. Available types: select, update, insert, delete, count
* @return void
* @access public
* @see Query_Database::__construct()
*/
public function __construct($db, $type) {
parent::__construct($db, $type);
$this->_db_type = $this->_db->db_type;
$this->_quote=$this->_db_type=='mysql'?'`':'"';
}
/**
* Puts quotes around a string
*
* @param string $str String to be enclosed in quotes
* @return string String surrounded with quotes
* @access protected
*/
protected function quote($str) {
return $this->_quote.$str.$this->_quote;
}
/**
* If a string is passed escapes a field by enclosing it in specified quotes.
* If you pass an Expression_Database object the value will be inserted into the query unescaped
*
* @param mixed $field Field to be escaped or an Expression_Database object
* if the field must not be escaped
* @return string Escaped field representation
* @access public
* @see Expression_Database
*/
public function escape_field($field) {
if (is_object($field) && get_class($field) == 'Expression_Database')
return $field->value.' ';
$field = explode('.', $field);
if (count($field) == 1)
array_unshift($field,$this->last_alias());
$str = $this->quote($field[0]).'.';
if (trim($field[1]) == '*')
return $str.'* ';
return $str.$this->quote($field[1]);
}
/**
* Replaces the value with ? and appends it to the parameters array
* If you pass an Expression_Database object the value will be inserted into the query unescaped
* @param mixed $val Value to be escaped or an Expression_Database object
* if the value must not be escaped
* @param array &$params Reference to parameters array
* @return string Escaped value representation
* @access public
*/
public function escape_value($val,&$params) {
if (is_object($val) && get_class($val) == 'Expression_Database')
return $val->value.' ';
$params[] = $val;
return '? ';
}
/**
* Builds a query and fills the $params array with parameter values
*
* @return array An array with a prepared query string and an array of parameters
* @access public
*/
public function query() {
$query = '';
$params = array();
if ($this->_type == 'insert') {
$query.= "INSERT INTO {$this->quote($this->_table)} ";
if (empty($this->_data) && $this->_db_type == 'pgsql'){
$query.= "DEFAULT VALUES ";
}else{
$columns = '';
$values = '';
$first = true;
foreach($this->_data as $key => $val) {
if (!$first) {
$values.= ',';
$columns.= ',';
}else {
$first=false;
}
$columns.= $this->quote($key)." ";
$values.=$this->escape_value($val,$params);
}
$query.= "({$columns}) VALUES({$values})";
}
}else{
if ($this->_type == 'select'){
$query.= "SELECT ";
if($this->_fields==null){
$query.= "* ";
}else{
$first = true;
foreach($this->_fields as $f) {
if (!$first) {
$query.=", ";
}else {
$first = false;
}
if(is_array($f)){
$query.= "{$this->escape_field($f[0])} AS {$f[1]} ";
}else {
$query.= "{$this->escape_field($f)} ";
}
}
}
$query.= "FROM {$this->quote($this->_table)} ";
}
if ($this->_type == 'count') {
$query.= "SELECT COUNT(*) as {$this->quote('count')} FROM {$this->quote($this->_table)} ";
}
if($this->_type=='delete')
$query.= "DELETE {$this->last_alias()}.* FROM {$this->quote($this->_table)} ";
if($this->_type=='update'){
$query.= "UPDATE {$this->quote($this->_table)} SET ";
$first = true;
foreach($this->_data as $key=>$val){
if (!$first) {
$query.=',';
}else {
$first=false;
}
$query.= "{$this->quote($key)}=".$this->escape_value($val,$params);
}
}
foreach($this->_joins as $join) {
$table = $join[0];
if (is_array($table)){
$table = "{$this->quote($table[0])} as {$this->quote($table[1])}";
}else {
$table="{$this->quote($table)}";
}
$query.= strtoupper($join[1])." JOIN {$table} ON ".$this->get_condition_query($join[2],$params,true,true);
}
if (!empty($this->_conditions)) {
$query.="WHERE ".$this->get_condition_query($this->_conditions,$params,true);
}
if (($this->_type == 'select' || $this->_type == 'count') && $this->_group_by!=null) {
$query.="GROUP BY ".$this->escape_field($this->_group_by);
}
if (($this->_type == 'select' || $this->_type == 'count') && !empty($this->_having)) {
$query.="HAVING ".$this->get_condition_query($this->_having,$params,true);
}
if ($this->_type == 'select' && !empty($this->_orderby)) {
$query.="ORDER BY ";
$first = true;
foreach($this->_orderby as $order) {
if (!$first) {
$query.=',';
}else {
$first=false;
}
$query.= $this->escape_field($order[0])." ";
if (isset($order[1])) {
$dir = strtoupper($order[1]);
$query.=$dir." ";
}
}
}
if($this->_type != 'count'){
if ($this->_limit != null)
$query.= "LIMIT {$this->_limit} ";
if ($this->_offset != null)
$query.= "OFFSET {$this->_offset} ";
}
}
return array($query,$params);
}
/**
* Recursively parses conditions array into a query string
*
* @param array $p Element of the cobditions array
* @param array &$params Reference to parameters array
* @param boolean $skip_first_operator Flag to skip the first logical operator in a query
* to prevent AND or OR to be at the beginning of the query
* @param boolean $value_is_field Flag if the the value in the logical operations should
* be treated as a field. E.g. for joins where the fields are
* compared between themselves and not with actual values
* @return string String representation of the conditions
* @access public
* @throws Exception If condition cannot be parsed
*/
public function get_condition_query($p,&$params,$skip_first_operator,$value_is_field=false) {
if (isset($p['field'])) {
if ($value_is_field){
$param = $this->escape_field($p['value']);
}else {
$param = $this->escape_value($p['value'],$params);
}
return $this->escape_field($p['field']).' '.$p['operator'].' '.$param.' ';
}
if (isset($p['logic'])) {
return ($skip_first_operator?'':strtoupper($p['logic'])).' '
.$this->get_condition_query($p['conditions'],$params,false,$value_is_field).' ';
}
$conds = '';
$skip=$skip_first_operator||(count($p) > 1);
foreach($p as $q) {
$conds.=$this->get_condition_query($q,$params,$skip,$value_is_field);
$skip=false;
}
if (count($p) > 1 && !$skip_first_operator)
return "( ".$conds." ) ";
return $conds;
throw new Exception("Cannot parse condition:\n".var_export($p,true));
}
}
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