OpenSQLManager/sys/db/query_builder.php

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<?php
/**
* OpenSQLManager
*
* Free Database manager for Open Source Databases
*
* @author Timothy J. Warren
* @copyright Copyright (c) 2012
* @link https://github.com/aviat4ion/OpenSQLManager
* @license http://philsturgeon.co.uk/code/dbad-license
*/
// --------------------------------------------------------------------------
/**
* Convienience class for creating sql queries - also the class that
* instantiates the specific db driver
*/
class Query_Builder {
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private $table, $where_array, $sql, $select_string, $where_string;
/**
* Constructor
*
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* @param object $conn_name - the name of the connection/parameters
*/
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public function __construct($params)
{
$params->type = strtolower($params->type);
$dbtype = ($params->type !== 'postgresql') ? $params->type : 'pgsql';
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// Initiate the constructor for the selected database
switch($dbtype)
{
default:
$this->db = new $dbtype("host={$params->host};port={$params->port};", $params->user, $params->pass);
break;
case "sqlite":
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if ( ! empty($params->user) && ! empty($params->pass))
{
$this->db = new $dbtype($params->file, $params->user, $params->pass);
}
else
{
$this->db = new $dbtype($params->file);
}
break;
case "firebird":
$this->db = new $dbtype("{$params->host}:{$params->file}", $params->user, $params->pass);
break;
}
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// Make things just slightly shorter
$this->sql =& $this->db->sql;
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}
// --------------------------------------------------------------------------
/**
* Select and retrieve all records from the current table, and/or
* execute current compiled query
*
* @param $table
* @param int $limit
* @param int $offset
* @return object
*/
public function get($table='', $limit=FALSE, $offset=FALSE)
{
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// @todo Only add in the table name when using the select method
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// @todo Only execute combined query when using other query methods and empty parameters
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$sql = 'SELECT * FROM ' . $this->db->quote_ident($table);
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if ( ! empty($table) && $limit === FALSE && $offset === FALSE)
{
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$result = $this->db->query($sql);
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}
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// Set the select string
if ( ! empty($this->select_string))
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{
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// Replace the star with the selected fields
$sql = str_replace('*', $this->select_string, $sql);
}
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// Set the where string
if ( ! empty($this->where_string))
{
$sql .= $this->where_string;
}
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// Set the limit, if it exists
if ($limit !== FALSE)
{
$sql = $this->sql->limit($sql, $limit, $offset);
}
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echo $sql."<br />";
// Do prepared statements for anything involving a "where" clause
if ( ! empty($this->where_string))
{
return $this->db->prepare_execute($sql, array_values($this->where_array));
}
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// Otherwise, a simple query will do.
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return $this->db->query($sql);
}
// --------------------------------------------------------------------------
/**
* Specifies rows to select in a query
*
* @param string $fields
* @return $this
*/
public function select($fields)
{
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// Split fields by comma
$fields_array = explode(",", $fields);
$fields_array = array_map('trim', $fields_array);
// Split on 'As'
foreach ($fields_array as $key => $field)
{
if (stripos($field, 'as') !== FALSE)
{
$fields_array[$key] = preg_split('`as`i', $field);
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$fields_array[$key] = array_map('trim', $fields_array[$key]);
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}
}
// Quote the identifiers
$safe_array = array_map(array($this->db, 'quote_ident'), $fields_array);
// Join the strings back together
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for($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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{
$safe_array[$i] = implode(' AS ', $safe_array[$i]);
}
}
$this->select_string = implode(', ', $safe_array);
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//echo $this->select_string."<br />";
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return $this;
}
// --------------------------------------------------------------------------
/**
* Specify condition(s) in the where clause of a query
* Note: this function works with key / value, or a
* passed array with key / value pairs
*
* @param mixed $key
* @param mixed $val
* @return $this
*/
public function where($key, $val=array())
{
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// Key and value passed? Add them to the where array
if (is_scalar($key) && is_scalar($val))
{
$this->where_array[$key] = $val;
}
// Array or object, loop through and add to the where array
elseif ( ! is_scalar($key))
{
foreach($key as $k => $v)
{
$this->where_array[$k] = $v;
}
}
// The values are irrelevant until the query is actually run
$fields = array_keys($this->where_array);
// Array of conditions
$kv_array = array();
// Create key/value placeholders
foreach($fields as $f)
{
// Split each key by spaces, incase there
// is an operator such as >, <, !=, etc.
$f_array = explode(' ', trim($f));
// Simple key = val
if (count($f_array) === 1)
{
$kv_array[] = $this->db->quote_ident($f_array[0]) . '= ?';
}
else // Other operators
{
$kv_array[] = $this->db->quote_ident($f_array[0]) . " {$f_array[1]} ?";
}
}
// Create the where portion of the string
$this->where_string = ' WHERE '.implode(', ', $kv_array);
// @todo Implement where method
return $this;
}
// --------------------------------------------------------------------------
/**
* Creates a join phrase in a compiled query
*
* @param string $table
* @param string $condition
* @param string $type
* @return $this
*/
public function join($table, $condition, $type='inner')
{
// @todo Implement join method
return $this;
}
// --------------------------------------------------------------------------
/**
* Specify the database table to select from
*
* @param string $dbname
* @return $this
*/
public function from($dbname)
{
// @todo Implement from method
return $this;
}
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// --------------------------------------------------------------------------
/**
* String together the sql statements for sending to the db
*
* @return $string
*/
private function _compile()
{
// @todo Implement _compile method
}
}