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Query Builder select method

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This commit is contained in:
Timothy Warren 2012-03-09 08:04:47 -05:00
parent 80b77487eb
commit c4f1fd3e0d
3 changed files with 54 additions and 8 deletions
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10
sys/db/db_pdo.php
View File

@ -155,11 +155,19 @@ abstract class DB_PDO extends PDO {
/**
* Surrounds the string with the databases identifier escape characters
*
* @param string $ident
* @param mixed $ident
* @return string
*/
public function quote_ident($ident)
{
if (is_array($ident))
{
for($i = 0, $count = count($ident); $i < $count; $i++)
{
$ident[$i] = $this->quote_ident($ident[$i]);
}
}
// Split each identifier by the period
$hiers = explode('.', $ident);

8
sys/db/drivers/mysql.php
View File

@ -134,6 +134,14 @@ class MySQL extends DB_PDO {
*/
public function quote_ident($ident)
{
if (is_array($ident))
{
for($i = 0, $count = count($ident); $i < $count; $i++)
{
$ident[$i] = $this->quote_ident($ident[$i]);
}
}
// Split each identifier by the period
$hiers = explode('.', $ident);

44
sys/db/query_builder.php
View File

@ -18,7 +18,7 @@
*/
class Query_Builder {
private $table, $where_array, $sql;
private $table, $where_array, $sql, $select_string;
/**
* Constructor
@ -79,15 +79,19 @@ class Query_Builder {
{
$result = $this->db->query($sql);
}
else
elseif ( ! empty($this->select_string))
{
$sql = $this->sql->limit($sql, $limit, $offset);
$result = $this->db->query($sql);
// Replace the star with the selected fields
$sql = str_replace('*', $this->select_string, $sql);
}
//echo $sql."<br />";
// Set the limit, if it exists
if ($limit !== FALSE)
{
$sql = $this->sql->limit($sql, $limit, $offset);
}
return $result;
return $this->db->query($sql);
}
// --------------------------------------------------------------------------
@ -100,7 +104,33 @@ class Query_Builder {
*/
public function select($fields)
{
// @todo Implement select method
// 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);
}
}
// Quote the identifiers
$safe_array = array_map(array($this->db, 'quote_ident'), $fields_array);
// Join the strings back together
for($i = 0, $c = count($safe_array); $i < $count; $i++)
{
if (is_array($safe_array[$i])
{
$safe_array[$i] = implode(' AS ', $safe_array[$i]);
}
}
$this->select_string = implode(', ', $safe_array);
return $this;
}