Query/core/abstract/abstract_query_builder.php

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<?php
/**
* Query
*
* Free Query Builder / Database Abstraction Layer
*
* @package Query
* @author Timothy J. Warren
* @copyright Copyright (c) 2012 - 2014
* @link https://github.com/aviat4ion/Query
* @license http://philsturgeon.co.uk/code/dbad-license
*/
// --------------------------------------------------------------------------
namespace Query;
use \Query\Driver\Driver_Interface;
// --------------------------------------------------------------------------
/**
* Abstract Class for internal implementation methods of the Query Builder
* @package Query
*/
abstract class Abstract_Query_Builder {
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// --------------------------------------------------------------------------
// ! Constants
// --------------------------------------------------------------------------
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const KEY = 0;
const VALUE = 1;
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const BOTH = 2;
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// --------------------------------------------------------------------------
// ! SQL Clause Strings
// --------------------------------------------------------------------------
/**
* Compiled 'select' clause
* @var string
*/
protected $select_string = '';
/**
* Compiled 'from' clause
* @var string
*/
protected $from_string;
/**
* Compiled arguments for insert / update
* @var string
*/
protected $set_string;
/**
* Order by clause
* @var string
*/
protected $order_string;
/**
* Group by clause
* @var string
*/
protected $group_string;
// --------------------------------------------------------------------------
// ! SQL Clause Arrays
// --------------------------------------------------------------------------
/**
* Keys for insert/update statement
* @var array
*/
protected $set_array_keys = array();
/**
* Key/val pairs for order by clause
* @var array
*/
protected $order_array = array();
/**
* Key/val pairs for group by clause
* @var array
*/
protected $group_array = array();
// --------------------------------------------------------------------------
// ! Other Class vars
// --------------------------------------------------------------------------
/**
* Values to apply to prepared statements
* @var array
*/
protected $values = array();
/**
* Values to apply to where clauses in prepared statements
* @var array
*/
protected $where_values = array();
/**
* Value for limit string
* @var string
*/
protected $limit;
/**
* Value for offset in limit string
* @var int
*/
protected $offset;
/**
* Query component order mapping
* for complex select queries
*
* Format:
* array(
* 'type' => 'where',
* 'conjunction' => ' AND ',
* 'string' => 'k=?'
* )
*
* @var array
*/
protected $query_map = array();
/**
* Map for having clause
* @var array
*/
protected $having_map;
/**
* Convenience property for connection management
* @var string
*/
public $conn_name = "";
/**
* List of queries executed
* @var array
*/
public $queries;
/**
* Whether to do only an explain on the query
* @var bool
*/
protected $explain;
/**
* The current database driver
* @var Driver_Interface
*/
public $db;
/**
* Query parser class instance
* @var Query_Parser
*/
protected $parser;
/**
* Alias to driver util class
* @var \Query\Driver\Abstract_Util
*/
public $util;
/**
* Alias to driver sql class
* @var \Query\Driver\SQL_Interface
*/
public $sql;
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// --------------------------------------------------------------------------
// Methods
// --------------------------------------------------------------------------
/**
* Set values in the class, with either an array or key value pair
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*
* @param array $var
* @param mixed $key
* @param mixed $val
* @param int $val_type
* @return array
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*/
protected function _mixed_set(&$var, $key, $val=NULL, $val_type=self::BOTH)
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{
$arg = (is_scalar($key) && is_scalar($val))
? array($key => $val)
: $key;
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foreach($arg as $k => $v)
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{
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if (in_array($val_type, array(self::KEY, self::VALUE)))
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{
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$var[] = ($val_type === self::KEY)
? $k
: $v;
}
else
{
$var[$k] = $v;
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}
}
return $var;
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}
// --------------------------------------------------------------------------
/**
* Method to simplify select_ methods
*
* @param string $field
* @param string|bool $as
* @return string
*/
protected function _select($field, $as = FALSE)
{
// Escape the identifiers
$field = $this->db->quote_ident($field);
$as = ($as !== FALSE)
? $this->db->quote_ident($as)
: $field;
return "({$field}) AS {$as} ";
}
// --------------------------------------------------------------------------
/**
* Helper function for returning sql strings
*
* @param string $type
* @param string $table
* @param bool $reset
* @return string
*/
protected function _get_compile($type, $table, $reset)
{
$sql = $this->_compile($type, $table);
// Reset the query builder for the next query
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if ($reset) $this->reset_query();
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return $sql;
}
// --------------------------------------------------------------------------
/**
* Simplify 'like' methods
*
* @param string $field
* @param mixed $val
* @param string $pos
* @param string $like
* @param string $conj
* @return Query_Builder
*/
protected function _like($field, $val, $pos, $like='LIKE', $conj='AND')
{
$field = $this->db->quote_ident($field);
// Add the like string into the order map
$l = $field. " {$like} ?";
if ($pos == 'before')
{
$val = "%{$val}";
}
elseif ($pos == 'after')
{
$val = "{$val}%";
}
else
{
$val = "%{$val}%";
}
$conj = (empty($this->query_map)) ? ' WHERE ' : " {$conj} ";
$this->_append_map($conj, $l, 'like');
// Add to the values array
$this->where_values[] = $val;
return $this;
}
// --------------------------------------------------------------------------
/**
* Simplify building having clauses
*
* @param mixed $key
* @param mixed $val
* @param string $conj
* @return Query_Builder
*/
protected function _having($key, $val=array(), $conj='AND')
{
$where = $this->_where($key, $val);
// Create key/value placeholders
foreach($where as $f => $val)
{
// Split each key by spaces, in case there
// is an operator such as >, <, !=, etc.
$f_array = explode(' ', trim($f));
$item = $this->db->quote_ident($f_array[0]);
// Simple key value, or an operator
$item .= (count($f_array) === 1) ? '=?' : " {$f_array[1]} ?";
// Put in the having map
$this->having_map[] = array(
'conjunction' => ( ! empty($this->having_map)) ? " {$conj} " : ' HAVING ',
'string' => $item
);
}
return $this;
}
// --------------------------------------------------------------------------
/**
* Do all the repeditive stuff for where/having type methods
*
* @param mixed $key
* @param mixed $val
* @return array
*/
protected function _where($key, $val=array())
{
$where = array();
$this->_mixed_set($where, $key, $val, self::BOTH);
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$this->_mixed_set($this->where_values, $key, $val, self::VALUE);
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return $where;
}
// --------------------------------------------------------------------------
/**
* Simplify generating where string
*
* @param mixed $key
* @param mixed $val
* @param string $conj
* @return Query_Builder
*/
protected function _where_string($key, $val=array(), $conj='AND')
{
// Create key/value placeholders
foreach($this->_where($key, $val) as $f => $val)
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{
// Split each key by spaces, in case there
// is an operator such as >, <, !=, etc.
$f_array = explode(' ', trim($f));
$item = $this->db->quote_ident($f_array[0]);
// Simple key value, or an operator
$item .= (count($f_array) === 1) ? '=?' : " {$f_array[1]} ?";
// Get the type of the first item in the query map
$first_item = end($this->query_map);
// Determine the correct conjunction
if (empty($this->query_map))
{
$conj = "\nWHERE ";
}
elseif ($first_item['type'] === 'group_start')
{
$conj = '';
}
else
{
$conj = " {$conj} ";
}
$this->_append_map($conj, $item, 'where');
}
return $this;
}
// --------------------------------------------------------------------------
/**
* Simplify where_in methods
*
* @param mixed $key
* @param mixed $val
* @param string $in - The (not) in fragment
* @param string $conj - The where in conjunction
* @return Query_Builder
*/
protected function _where_in($key, $val=array(), $in='IN', $conj='AND')
{
$key = $this->db->quote_ident($key);
$params = array_fill(0, count($val), '?');
foreach($val as $v)
{
$this->where_values[] = $v;
}
$conjunction = ( ! empty($this->query_map)) ? " {$conj} " : ' WHERE ';
$str = $key . " {$in} (".implode(',', $params).') ';
$this->_append_map($conjunction, $str, 'where_in');
return $this;
}
// --------------------------------------------------------------------------
/**
* Executes the compiled query
*
* @param string $type
* @param string $table
* @param string $sql
* @param array|null $vals
* @return \PDOStatement
*/
protected function _run($type, $table, $sql=NULL, $vals=NULL)
{
if (is_null($sql))
{
$sql = $this->_compile($type, $table);
}
if (is_null($vals))
{
$vals = array_merge($this->values, (array) $this->where_values);
}
$start_time = microtime(TRUE);
$res = (empty($vals))
? $this->db->query($sql)
: $this->db->prepare_execute($sql, $vals);
$end_time = microtime(TRUE);
$total_time = number_format($end_time - $start_time, 5);
// Add this query to the list of executed queries
$this->_append_query($vals, $sql, $total_time);
// Reset class state for next query
$this->reset_query();
return $res;
}
// --------------------------------------------------------------------------
/**
* Add an additional set of mapping pairs to a internal map
*
* @param string $conjunction
* @param string $string
* @param string $type
* @return void
*/
protected function _append_map($conjunction = '', $string = '', $type = '')
{
array_push($this->query_map, array(
'type' => $type,
'conjunction' => $conjunction,
'string' => $string
));
}
// --------------------------------------------------------------------------
/**
* Convert the prepared statement into readable sql
*
* @param array $vals
* @param string $sql
* @param string $total_time
* @return void
*/
protected function _append_query($vals, $sql, $total_time)
{
$evals = (is_array($vals)) ? $vals : array();
$esql = str_replace('?', "%s", $sql);
// Quote string values
foreach($evals as &$v)
{
$v = ( ! is_numeric($v)) ? htmlentities($this->db->quote($v), ENT_NOQUOTES, 'utf-8') : $v;
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}
// Add the query onto the array of values to pass
// as arguments to sprintf
array_unshift($evals, $esql);
// Add the interpreted query to the list of executed queries
$this->queries[] = array(
'time' => $total_time,
'sql' => call_user_func_array('sprintf', $evals),
);
$this->queries['total_time'] += $total_time;
// Set the last query to get rowcounts properly
$this->db->last_query = $sql;
}
// --------------------------------------------------------------------------
/**
* Sub-method for generating sql strings
*
* @param string $type
* @param string $table
* @return string
*/
protected function _compile_type($type='', $table='')
{
if ($type === 'insert')
{
$param_count = count($this->set_array_keys);
$params = array_fill(0, $param_count, '?');
$sql = "INSERT INTO {$table} ("
. implode(',', $this->set_array_keys)
. ")\nVALUES (".implode(',', $params).')';
}
elseif ($type === 'update')
{
$sql = "UPDATE {$table}\nSET {$this->set_string}";
}
elseif ($type === 'delete')
{
$sql = "DELETE FROM {$table}";
}
else // GET queries
{
$sql = "SELECT * \nFROM {$this->from_string}";
// Set the select string
if ( ! empty($this->select_string))
{
// Replace the star with the selected fields
$sql = str_replace('*', $this->select_string, $sql);
}
}
return $sql;
}
// --------------------------------------------------------------------------
/**
* String together the sql statements for sending to the db
*
* @param string $type
* @param string $table
* @return $string
*/
protected function _compile($type='', $table='')
{
// Get the base clause for the query
$sql = $this->_compile_type($type, $this->db->quote_table($table));
$clauses = array(
'query_map',
'group_string',
'order_string',
'having_map',
);
// Set each type of subclause
foreach($clauses as $clause)
{
$param = $this->$clause;
if (is_array($param))
{
foreach($param as $q)
{
$sql .= $q['conjunction'] . $q['string'];
}
}
else
{
$sql .= $param;
}
}
// Set the limit via the class variables
if (is_numeric($this->limit))
{
$sql = $this->sql->limit($sql, $this->limit, $this->offset);
}
// See if the query plan, rather than the
// query data should be returned
if ($this->explain === TRUE)
{
$sql = $this->sql->explain($sql);
}
// $sql . "<br />";
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return $sql;
}
}
// End of abstract_query_builder.php