296 lines
6.7 KiB
PHP
296 lines
6.7 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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/**
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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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/**
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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, $offset=FALSE)
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{
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// The simplest case, just get the data from the table
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if ( ! empty($table) && empty($this->from_string))
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{
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$sql = 'SELECT * FROM ' . $this->db->quote_ident($table);
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}
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elseif(empty($table) && ! empty($this->from_string))
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{
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$sql = 'SELECT * FROM ' . $this->from_string;
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}
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// Set the select string
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if ( ! empty($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 .= $this->where_string;
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}
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// Set the limit, if it exists
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if ($limit !== FALSE)
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{
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$sql = $this->sql->limit($sql, $limit, $offset);
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}
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echo $sql."<br />";
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// Do prepared statements for anything involving a "where" clause
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if ( ! empty($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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/**
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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 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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* 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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* 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 $this;
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}
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// --------------------------------------------------------------------------
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/**
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* Clear out the class variables, so the next query can be run
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*/
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private function _reset()
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{
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unset($this->table);
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unset($this->where_array);
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unset($this->where_string);
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unset($this->select_string);
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unset($this->from_string);
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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 $type
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* @return $string
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*/
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private function _compile($type)
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{
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// @todo Implement _compile method
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}
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} |