604 lines
13 KiB
PHP
604 lines
13 KiB
PHP
<?php
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/**
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* OpenSQLManager
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*
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* Free Database manager for Open Source Databases
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*
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* @author Timothy J. Warren
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* @copyright Copyright (c) 2012
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* @link https://github.com/aviat4ion/OpenSQLManager
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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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* Convienience class for creating sql queries - also the class that
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* instantiates the specific db driver
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*/
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class Query_Builder {
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private $table,
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$sql,
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$select_string,
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$from_string,
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$where_array,
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$where_string,
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$insert_string,
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$update_string,
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$set_array,
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$set_array_keys,
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$set_string,
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$limit,
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$offset;
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/**
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* Constructor
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*
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* @param object $conn_name - the name of the connection/parameters
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*/
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public function __construct($params)
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{
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$params->type = strtolower($params->type);
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$dbtype = ($params->type !== 'postgresql') ? $params->type : 'pgsql';
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// Initiate the constructor for the selected database
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switch($dbtype)
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{
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default:
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$this->db = new $dbtype("host={$params->host};port={$params->port};", $params->user, $params->pass);
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break;
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case "sqlite":
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if ( ! empty($params->user) && ! empty($params->pass))
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{
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$this->db = new $dbtype($params->file, $params->user, $params->pass);
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}
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else
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{
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$this->db = new $dbtype($params->file);
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}
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break;
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case "firebird":
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$this->db = new $dbtype("{$params->host}:{$params->file}", $params->user, $params->pass);
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break;
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}
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// Make things just slightly shorter
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$this->sql =& $this->db->sql;
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}
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// --------------------------------------------------------------------------
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// ! Select Queries
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// --------------------------------------------------------------------------
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/**
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* Specifies rows to select in a query
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*
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* @param string $fields
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* @return $this
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*/
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public function select($fields)
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{
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// Split fields by comma
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$fields_array = explode(",", $fields);
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$fields_array = array_map('trim', $fields_array);
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// Split on 'As'
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foreach ($fields_array as $key => $field)
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{
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if (stripos($field, 'as') !== FALSE)
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{
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$fields_array[$key] = preg_split('`as`i', $field);
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$fields_array[$key] = array_map('trim', $fields_array[$key]);
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}
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}
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// Quote the identifiers
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$safe_array = array_map(array($this->db, 'quote_ident'), $fields_array);
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unset($fields_array);
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// Join the strings back together
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for($i = 0, $c = count($safe_array); $i < $c; $i++)
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{
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if (is_array($safe_array[$i]))
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{
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$safe_array[$i] = implode(' AS ', $safe_array[$i]);
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}
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}
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$this->select_string = implode(', ', $safe_array);
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unset($safe_array);
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return $this;
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}
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// --------------------------------------------------------------------------
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/**
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* Specify the database table to select from
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*
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* @param string $dbname
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* @return $this
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*/
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public function from($dbname)
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{
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// Split identifiers on spaces
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$ident_array = explode(' ', trim($dbname));
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$ident_array = array_map('trim', $ident_array);
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// Quote the identifiers
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$ident_array = array_map(array($this->db, 'quote_ident'), $ident_array);
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// Paste it back together
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$this->from_string = implode(' ', $ident_array);
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return $this;
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}
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// --------------------------------------------------------------------------
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/**
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* Creates a Like clause in the sql statement
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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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* @return $this
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*/
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public function like($field, $val, $pos='both')
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{
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// @todo implement like method
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return $this;
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}
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// --------------------------------------------------------------------------
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/**
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* Specify condition(s) in the where clause of a query
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* Note: this function works with key / value, or a
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* passed array with key / value pairs
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*
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* @param mixed $key
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* @param mixed $val
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* @return $this
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*/
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public function where($key, $val=array())
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{
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// Key and value passed? Add them to the where array
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if (is_scalar($key) && is_scalar($val))
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{
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$this->where_array[$key] = $val;
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}
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// Array or object, loop through and add to the where array
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elseif ( ! is_scalar($key))
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{
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foreach($key as $k => $v)
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{
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$this->where_array[$k] = $v;
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}
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}
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// The values are irrelevant until the query is actually run
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$fields = array_keys($this->where_array);
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// Array of conditions
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$kv_array = array();
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// Create key/value placeholders
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foreach($fields as $f)
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{
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// Split each key by spaces, incase there
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// is an operator such as >, <, !=, etc.
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$f_array = explode(' ', trim($f));
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// Simple key = val
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if (count($f_array) === 1)
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{
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$kv_array[] = $this->db->quote_ident($f_array[0]) . '= ?';
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}
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else // Other operators
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{
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$kv_array[] = $this->db->quote_ident($f_array[0]) . " {$f_array[1]} ?";
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}
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}
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// Create the where portion of the string
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$this->where_string = ' WHERE '.implode(' AND ', $kv_array);
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unset($kv_array);
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unset($fields);
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return $this;
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}
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// --------------------------------------------------------------------------
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/**
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* Where clause prefixed with "OR"
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*
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* @param string $field
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* @param mixed $value
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* @return $this
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*/
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public function or_where($field, $value)
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{
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// @todo Implement or_where method
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return $this;
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}
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// --------------------------------------------------------------------------
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/**
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* Where clause with 'IN' statement
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*
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* @param mixed $field
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* @param mixed $val
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* @return $this
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*/
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public function where_in($field, $val)
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{
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// @todo Implement Where_in method
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return $this;
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}
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// --------------------------------------------------------------------------
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/**
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* Where in statement prefixed with "or"
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*
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* @param string $field
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* @param mixed $val
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* @return $this
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*/
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public function or_where_in($field, $val)
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{
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// @todo Implement or_where_in method
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return $this;
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}
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// --------------------------------------------------------------------------
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/**
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* WHERE NOT IN (FOO) clause
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*
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* @param string $field
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* @param mixed $val
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* @return $this
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*/
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public function where_not_in($field, $val)
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{
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// @todo Implement where_not_in method
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return $this;
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}
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// --------------------------------------------------------------------------
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/**
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* OR WHERE NOT IN (FOO) clause
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*
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* @param string $field
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* @param mixed $val
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* @return $this
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*/
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public function or_where_not_in($field, $val)
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{
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// @todo Implement or_where_not_in method
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return $this;
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}
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// --------------------------------------------------------------------------
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/**
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* Creates a join phrase in a compiled query
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*
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* @param string $table
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* @param string $condition
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* @param string $type
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* @return $this
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*/
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public function join($table, $condition, $type='inner')
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{
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// @todo Implement join method
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return $this;
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}
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// --------------------------------------------------------------------------
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/**
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* Group the results by the selected field(s)
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*
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* @param mixed $field
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* @return $this
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*/
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public function group_by($field)
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{
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// @todo Implement group_by method
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return $this;
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}
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// --------------------------------------------------------------------------
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/**
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* Order the results by the selected field(s)
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*
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* @param string $field
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* @param string $type
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* @return $this
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*/
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public function order_by($field, $type="")
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{
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// @todo implement order_by method
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return $this;
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}
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// --------------------------------------------------------------------------
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/**
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* Set a limit on the current sql statement
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*
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* @param int $limit
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* @param int $offset
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* @return string
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*/
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public function limit($limit, $offset=FALSE)
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{
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$this->limit = $limit;
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$this->offset = $offset;
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return $this;
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}
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// --------------------------------------------------------------------------
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/**
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* Select and retrieve all records from the current table, and/or
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* execute current compiled query
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*
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* @param $table
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* @param int $limit
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* @param int $offset
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* @return object
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*/
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public function get($table='', $limit=FALSE, $offset=FALSE)
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{
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// Set the table
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if ( ! empty($table))
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{
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$this->from_string = $this->db->quote_ident($table);
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}
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// Set the limit, if it exists
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if ($limit !== FALSE)
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{
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$this->limit($limit, $offset);
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}
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$sql = $this->_compile('select');
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// Do prepared statements for anything involving a "where" clause
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if ( ! empty($this->where_string))
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{
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$result = $this->db->prepare_execute($sql, array_values($this->where_array));
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}
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else
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{
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// Otherwise, a simple query will do.
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$result = $this->db->query($sql);
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}
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// Reset for next query
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$this->_reset();
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return $result;
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}
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// --------------------------------------------------------------------------
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// ! Insert/Update/Delete Queries
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// --------------------------------------------------------------------------
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/**
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* Sets values for inserts / updates / deletes
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*
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* @param mixed $key
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* @param mixed $val
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* @return $this
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*/
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public function set($key, $val)
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{
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// Plain key, value pair
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if (is_scalar($key) && is_scalar($val))
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{
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$this->set_array[$key] = $val;
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}
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// Object or array
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elseif ( ! is_scalar($key))
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{
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foreach($key as $k => $v)
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{
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$this->set_array[$k] = $v;
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}
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}
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// Use the keys of the array to make the insert/update string
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$this->set_array_keys = array_keys($this->set_array);
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// Escape the field names
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$this->set_array_keys = array_map(array($this, 'quote_ident'), $this->set_array_keys);
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// Generate the "set" string
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$this->set_string = implode('=?, ', $this->set_array_keys);
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$this->set_string .= '=?';
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return $this;
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}
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// --------------------------------------------------------------------------
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/**
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* Creates an insert clause, and executes it
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*
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* @param string $table
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* @param mixed $data
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* @return mixed
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*/
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public function insert($table, $data=array())
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{
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// No use duplicating logic!
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if ( ! empty($data))
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{
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$this->set($data);
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}
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$params = array_values($this->set_array);
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$sql = $this->_compile("insert", $table);
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return $this->db->prepare_execute($sql, $params);
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}
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// --------------------------------------------------------------------------
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/**
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* Creates an update clause, and executes it
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*
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* @param string $table
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* @param mixed $data
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* @return mixed
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*/
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public function update($table, $data=array())
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{
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// No use duplicating logic!
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if ( ! empty($data))
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{
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$this->set($data);
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}
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$sql = 'UPDATE '.$this->quote_ident($table). ' SET '. $this->set_string;
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$params = array_values($this->set_array);
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// Do a linear array merge if there is a where string.
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// We need all the parameters to line up, even when
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// there are placeholders in the where string and
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// the set string
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if ( ! empty($this->where_string))
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{
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$sql .= $this->where_string;
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$where_params = array_values($this->where_array);
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foreach($where_params as $w)
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{
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$params[] = $w;
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}
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}
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// Run the query
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return $this->db->prepare_execute($sql, $params);
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}
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// --------------------------------------------------------------------------
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/**
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* Deletes data from a table
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*
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* @param string $table
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* @param mixed $where
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* @return
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*/
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public function delete($table, $where='')
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{
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// @todo implement delete method
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}
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// --------------------------------------------------------------------------
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/**
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* Clear out the class variables, so the next query can be run
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*/
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private function _reset()
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{
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// Only unset class variables that
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// are not callable. Otherwise, we'll
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// delete class methods!
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foreach($this as $name => $var)
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{
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// Skip properties that are needed for every query
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$save_properties = array(
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'db',
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'sql'
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);
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if (in_array($name, $save_properties))
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{
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continue;
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}
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// Nothing query-generation related is safe!
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if ( ! is_callable($this->$name))
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{
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unset($this->$name);
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}
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}
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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 $string
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*/
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private function _compile($type="select", $table="")
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{
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$sql = '';
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switch($type)
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{
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default:
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case "select":
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$sql = 'SELECT * FROM '.$this->from_string;
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// Set the select string
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if ( ! empty($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, $sql);
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}
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// Set the where string
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if ( ! empty($this->where_string))
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{
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$sql .= $this->where_string;
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}
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// Set the limit via the class variables
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if (is_numeric($this->limit))
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{
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$sql = $this->sql->limit($sql, $this->limit, $this->offset);
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}
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break;
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case "insert":
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$param_count = count($this->set_array);
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$params = array_file(0, $param_count, '?');
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$sql = 'INSERT (' . implode(', ', $this->set_array_keys) .
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') INTO '. $this->quote_ident($table) .
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'VALUES ('.implode(', ', $params).')';
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break;
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case "delete":
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// @todo Implement delete statements
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break;
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}
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return $sql;
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}
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}
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// End of query_builder.php
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