453 lines
9.6 KiB
PHP
453 lines
9.6 KiB
PHP
<?php
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/**
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* Query
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*
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* Free Query Builder / Database Abstraction Layer
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*
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* @package Query
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* @author Timothy J. Warren
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* @copyright Copyright (c) 2012 - 2014
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* @link https://github.com/aviat4ion/Query
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* @license http://philsturgeon.co.uk/code/dbad-license
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*/
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// --------------------------------------------------------------------------
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/**
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* Base class for query builder - defines the internal methods
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*
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* @package Query
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* @subpackage Query
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*/
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abstract class Abstract_Query_Builder implements iQuery_Builder {
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/**
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* Helper function for returning sql strings
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*
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* @param string $type
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* @param string $table
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* @param bool $reset
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* @resturn string
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*/
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protected function _get_compile($type, $table, $reset)
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{
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$sql = $this->_compile($type, $table);
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// Reset the query builder for the next query
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if ($reset)
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{
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$this->reset_query();
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}
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return $sql;
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}
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// --------------------------------------------------------------------------
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/**
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* Simplify building having clauses
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*
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* @param mixed $key
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* @param mixed $val
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* @param string $conj
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* @return $this
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*/
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protected function _having($key, $val=array(), $conj='AND')
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{
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$where = $this->_where($key, $val);
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// Create key/value placeholders
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foreach($where as $f => $val)
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{
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// Split each key by spaces, in case there
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// is an operator such as >, <, !=, etc.
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$f_array = explode(' ', trim($f));
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$item = $this->db->quote_ident($f_array[0]);
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// Simple key value, or an operator
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$item .= (count($f_array) === 1) ? '=?' : " {$f_array[1]} ?";
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// Put in the query map for select statements
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$this->having_map[] = array(
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'conjunction' => ( ! empty($this->having_map)) ? " {$conj} " : ' HAVING ',
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'string' => $item
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);
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}
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return $this;
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}
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// --------------------------------------------------------------------------
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/**
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* Do all the repeditive stuff for where/having type methods
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*
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* @param mixed $key
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* @param mixed $val
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* @return array
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*/
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protected function _where($key, $val=array())
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{
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$where = array();
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// Key and value passed? Add them to the where array
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if (is_scalar($key) && is_scalar($val))
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{
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$where[$key] = $val;
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$this->where_values[] = $val;
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}
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// Array or object, loop through and add to the where array
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elseif ( ! is_scalar($key))
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{
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foreach($key as $k => $v)
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{
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$where[$k] = $v;
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$this->where_values[] = $v;
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}
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}
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return $where;
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}
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// --------------------------------------------------------------------------
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/**
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* Simplify generating where string
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*
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* @param mixed $key
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* @param mixed $val
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* @param string $conj
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* @return $this
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*/
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protected function _where_string($key, $val=array(), $conj='AND')
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{
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$where = $this->_where($key, $val);
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// Create key/value placeholders
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foreach($where as $f => $val)
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{
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// Split each key by spaces, in case there
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// is an operator such as >, <, !=, etc.
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$f_array = explode(' ', trim($f));
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$item = $this->db->quote_ident($f_array[0]);
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// Simple key value, or an operator
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$item .= (count($f_array) === 1) ? '=?' : " {$f_array[1]} ?";
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// Get the type of the first item in the query map
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$first_item = end($this->query_map);
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// Determine the correct conjunction
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if (empty($this->query_map))
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{
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$conj = "\nWHERE ";
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}
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elseif ($first_item['type'] === 'group_start')
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{
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$conj = '';
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}
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else
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{
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$conj = " {$conj} ";
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}
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// Put in the query map for select statements
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$this->query_map[] = array(
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'type' => 'where',
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'conjunction' => $conj,
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'string' => $item
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);
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}
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return $this;
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}
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// --------------------------------------------------------------------------
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/**
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* Simplify where_in methods
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*
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* @param mixed $key
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* @param mixed $val
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* @param string $in - The (not) in fragment
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* @param string $conj - The where in conjunction
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* @return $this
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*/
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protected function _where_in($key, $val=array(), $in='IN', $conj='AND')
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{
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$key = $this->db->quote_ident($key);
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$params = array_fill(0, count($val), '?');
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foreach($val as $v)
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{
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$this->where_values[] = $v;
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}
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$string = $key . " {$in} (".implode(',', $params).') ';
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$this->query_map[] = array(
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'type' => 'where_in',
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'conjunction' => ( ! empty($this->query_map)) ? " {$conj} " : ' WHERE ',
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'string' => $string
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);
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return $this;
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}
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// --------------------------------------------------------------------------
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/**
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* Simplify 'like' methods
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*
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* @param string $field
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* @param mixed $val
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* @param string $pos
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* @param string $like
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* @param string $conj
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* @return $this
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*/
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protected function _like($field, $val, $pos, $like='LIKE', $conj='AND')
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{
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$field = $this->db->quote_ident($field);
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// Add the like string into the order map
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$l = $field. " {$like} ?";
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if ($pos == 'before')
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{
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$val = "%{$val}";
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}
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elseif ($pos == 'after')
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{
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$val = "{$val}%";
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}
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else
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{
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$val = "%{$val}%";
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}
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$this->query_map[] = array(
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'type' => 'like',
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'conjunction' => (empty($this->query_map)) ? ' WHERE ' : " {$conj} ",
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'string' => $l
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);
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// Add to the values array
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$this->where_values[] = $val;
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return $this;
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}
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// --------------------------------------------------------------------------
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/**
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* Method to simplify select_ methods
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*
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* @param string $field
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* @param string $as
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* @return string
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*/
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protected function _select($field, $as = FALSE)
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{
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// Escape the identifiers
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$field = $this->db->quote_ident($field);
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$as = ($as !== FALSE)
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? $this->db->quote_ident($as)
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: $field;
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return "({$field}) AS {$as} ";
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}
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// --------------------------------------------------------------------------
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/**
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* Executes the compiled query
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*
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* @param string $type
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* @param string $table
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* @param string $sql
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* @param mixed $vals
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* @return mixed
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*/
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protected function _run($type, $table, $sql=NULL, $vals=NULL)
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{
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if (is_null($sql))
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{
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$sql = $this->_compile($type, $table);
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}
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if (is_null($vals))
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{
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$vals = array_merge($this->values, (array) $this->where_values);
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}
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$evals = (is_array($vals)) ? $vals : array();
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$start_time = microtime(TRUE);
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if (empty($vals))
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{
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$res = $this->db->query($sql);
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}
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else
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{
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$res = $this->db->prepare_execute($sql, $vals);
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}
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$end_time = microtime(TRUE);
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$total_time = number_format($end_time - $start_time, 5);
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// Add the interpreted query to the list of executed queries
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foreach($evals as $k => &$v)
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{
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$v = ( ! is_numeric($v)) ? htmlentities($this->db->quote($v), ENT_NOQUOTES, 'utf-8', FALSE) : $v;
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}
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$esql = str_replace('?', "%s", $sql);
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array_unshift($vals, $esql);
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array_unshift($evals, $esql);
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$this->queries[] = array(
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'time' => $total_time,
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'sql' => call_user_func_array('sprintf', $evals),
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);
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$this->queries['total_time'] += $total_time;
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array_shift($vals);
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// Set the last query to get rowcounts properly
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$this->db->last_query = $sql;
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// Reset class state for next query
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$this->reset_query();
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return $res;
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}
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// --------------------------------------------------------------------------
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/**
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* Calls a function further down the inheritence chain
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*
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* @param string $name
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* @param array $params
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* @return mixed
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* @throws BadMethodCallException
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*/
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public function __call($name, $params)
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{
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if (method_exists($this->db, $name))
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{
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return call_user_func_array(array($this->db, $name), $params);
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}
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throw new BadMethodCallException("Method does not exist");
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}
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// --------------------------------------------------------------------------
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/**
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* Sub-method for generating sql strings
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*
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* @param string $type
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* @param string $table
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* @return $string
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*/
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protected function _compile_type($type='', $table='')
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{
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if ($type === 'insert')
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{
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$param_count = count($this->set_array_keys);
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$params = array_fill(0, $param_count, '?');
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$sql = "INSERT INTO {$table} ("
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. implode(',', $this->set_array_keys)
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. ")\nVALUES (".implode(',', $params).')';
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}
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elseif ($type === 'update')
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{
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$sql = "UPDATE {$table}\nSET {$this->set_string}";
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}
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elseif ($type === 'delete')
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{
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$sql = "DELETE FROM {$table}";
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}
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else // GET queries
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{
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$sql = "SELECT * \nFROM {$this->from_string}";
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// Set the select string
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if ( ! empty($this->select_string))
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{
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// Replace the star with the selected fields
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$sql = str_replace('*', $this->select_string, $sql);
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}
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}
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return $sql;
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}
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// --------------------------------------------------------------------------
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/**
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* String together the sql statements for sending to the db
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*
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* @param string $type
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* @param string $table
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* @return $string
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*/
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protected function _compile($type='', $table='')
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{
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// Get the base clause for the query
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$sql = $this->_compile_type($type, $this->db->quote_table($table));
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// Set the where clause
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if ( ! empty($this->query_map))
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{
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foreach($this->query_map as $k => $q)
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{
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$sql .= $q['conjunction'] . $q['string'];
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}
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}
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// Set the group_by clause
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if ( ! empty($this->group_string))
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{
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$sql .= $this->group_string;
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}
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// Set the order_by clause
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if ( ! empty($this->order_string))
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{
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$sql .= $this->order_string;
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}
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// Set the having clause
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if ( ! empty($this->having_map))
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{
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foreach($this->having_map as $h)
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{
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$sql .= $h['conjunction'] . $h['string'];
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}
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}
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// Set the limit via the class variables
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if (isset($this->limit) && is_numeric($this->limit))
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{
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$sql = $this->sql->limit($sql, $this->limit, $this->offset);
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}
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// See what needs to happen to only return the query plan
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if (isset($this->explain) && $this->explain === TRUE)
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{
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$sql = $this->sql->explain($sql);
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}
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return $sql;
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}
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}
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// End of abstract_query_builder.php
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