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<?php
/**
* Mysqli implementation of the database Query
*/
class Query_Mysql_Driver extends Query_Database{
/**
* If a string is passed escapes a field by enclosing it in `` quotes.
* If you pass an Expression_Database object the value will be inserted into the query uneascaped
*
* @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->lastAlias());
$str = '`'.$field[0].'`.';
if (trim($field[1]) == '*')
return $str.'* ';
return $str."`{$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 uneascaped
* @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->_table}`";
$columns = '';
$values = '';
$first = true;
foreach($this->_data as $key => $val) {
if (!$first) {
$values.= ',';
$columns.= ',';
}else {
$first=false;
}
$columns.= "`{$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;
}
$query.="{$this->escape_field($f)} ";
}
}
$query.= "FROM `{$this->_table}` ";
}
if ($this->_type == 'count') {
$query.= "SELECT COUNT(*) as `count` FROM `{$this->_table}` ";
}
if($this->_type=='delete')
$query.= "DELETE FROM `{$this->_table}` ";
if($this->_type=='update'){
$query.= "UPDATE `{$this->_table}` SET ";
$first = true;
foreach($this->_data as $key=>$val){
if (!$first) {
$query.=',';
}else {
$first=false;
}
$query.= "`{$key}`=".$this->escape_value($val,$params);
}
}
foreach($this->_joins as $join) {
$table = $join[0];
if (is_array($table)){
$table = "`{$table[0]}` as `{$table[1]}`";
}else {
$table="`{$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->_groupby!=null) {
$query.="GROUP BY ".$this->escape_field($this->_groupby);
}
if (($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 $p Element of the array of conditions
* @param array &$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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