diff --git a/system/database/DB_utility.php b/system/database/DB_utility.php
index 764f10c..ff9407e 100644
--- a/system/database/DB_utility.php
+++ b/system/database/DB_utility.php
@@ -25,6 +25,7 @@
class CI_DB_utility {
var $db;
+ var $cache = array();
/**
* Constructor
@@ -93,6 +94,12 @@
*/
function list_databases()
{
+ // Is there a cached result?
+ if (isset($this->cache['db_names']))
+ {
+ return $this->cache['db_names'];
+ }
+
$query = $this->db->query($this->_list_database());
$dbs = array();
if ($query->num_rows() > 0)
@@ -103,7 +110,7 @@
}
}
- return $dbs;
+ return $this->cache['db_names'] =& $dbs;
}
// --------------------------------------------------------------------
@@ -116,6 +123,12 @@
*/
function list_tables()
{
+ // Is there a cached result?
+ if (isset($this->cache['table_names']))
+ {
+ return $this->cache['table_names'];
+ }
+
if (FALSE === ($sql = $this->_list_tables()))
{
if ($this->db->db_debug)
@@ -143,7 +156,7 @@
}
}
- return $retval;
+ return $this->cache['table_names'] =& $retval;
}
// --------------------------------------------------------------------
@@ -258,7 +271,111 @@
return $this->db->query($sql);
}
+ // --------------------------------------------------------------------
+ /**
+ * Generate CVS from a query result object
+ *
+ * @access public
+ * @param object The query result object
+ * @param string The delimiter - tab by default
+ * @param string The newline character - \n by default
+ * @return string
+ */
+ function cvs_from_result($query, $delim = "\t", $newline = "\n")
+ {
+ if ( ! is_object($query) OR ! method_exists($query, 'field_names'))
+ {
+ show_error('You must submit a valid result object');
+ }
+
+ $out = '';
+
+ // First generate the headings from the table column names
+ foreach ($query->field_names() as $name)
+ {
+ $out .= $name.$delim;
+ }
+
+ $out = rtrim($out);
+ $out .= $newline;
+
+ // Next blast through the result array and build out the rows
+ foreach ($query->result_array() as $row)
+ {
+ foreach ($row as $item)
+ {
+ $out .= $item.$delim;
+ }
+ $out = rtrim($out);
+ $out .= $newline;
+ }
+
+ return $out;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Generate XML data from a query result object
+ *
+ * @access public
+ * @param object The query result object
+ * @param array Any preferences
+ * @return string
+ */
+ function xml_from_result($query, $params = array())
+ {
+ if ( ! is_object($query) OR ! method_exists($query, 'field_names'))
+ {
+ show_error('You must submit a valid result object');
+ }
+
+ // Set our default values
+ foreach (array('root' => 'root', 'element' => 'element', 'newline' => "\n", 'tab' => "\t") as $key => $val)
+ {
+ if ( ! isset($params[$key]))
+ {
+ $params[$key] = $val;
+ }
+ }
+
+ // Create variables for convenience
+ extract($params);
+
+ // Load the xml helper
+ $obj =& get_instance();
+ $obj->load->helper('xml');
+
+ // Generate the result
+ $xml = "<{$root}/>".$newline;
+ foreach ($query->result_array() as $row)
+ {
+ $xml .= $tab."<{$element}/>".$newline;
+
+ foreach ($row as $key => $val)
+ {
+ $xml .= $tab.$tab."<{$key}>".xml_convert($val)."</{$key}>".$newline;
+ }
+ $xml .= $tab."</{$element}>".$newline;
+ }
+ $xml .= "</$root>".$newline;
+
+ return $xml;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Database Backup
+ *
+ * @access public
+ * @return void
+ */
+ function export()
+ {
+ // The individual driver overloads this method
+ }
}