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Merged get_record caching from MDL-7196 in stable (thanks sam!)

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moodler 2006-10-26 07:57:07 +00:00
parent 4e86c6d735
commit 92309430b8
1 changed files with 31 additions and 4 deletions
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31
lib/dmllib.php
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@ -39,6 +39,7 @@
$empty_rs_cache = array(); // Keeps copies of the recordsets used in one invocation
$metadata_cache = array(); // Keeps copies of the MetaColumns() for each table used in one invocations
$record_cache = array(); // Keeps copies of all simple get_record results from one invocation
/// FUNCTIONS FOR DATABASE HANDLING ////////////////////////////////
@ -354,6 +355,7 @@ function count_records_sql($sql) {
/// GENERIC FUNCTIONS TO GET, INSERT, OR UPDATE DATA ///////////////////////////////////
/**
* Get a single record as an object
*
@ -369,11 +371,28 @@ function count_records_sql($sql) {
*/
function get_record($table, $field1, $value1, $field2='', $value2='', $field3='', $value3='', $fields='*') {
global $CFG;
global $CFG, $record_cache;
// Check to see whether this record is eligible for caching (fields=*, only condition is id)
$docache = false;
if ($field1=='id' && !$field2 && !$field3 && $fields=='*') {
$docache = true;
// If it's in the cache, return it
if (!empty($record_cache[$table][$value1])) {
return $record_cache[$table][$value1];
}
}
$select = where_clause($field1, $value1, $field2, $value2, $field3, $value3);
return get_record_sql('SELECT '.$fields.' FROM '. $CFG->prefix . $table .' '. $select);
$record = get_record_sql('SELECT '.$fields.' FROM '. $CFG->prefix . $table .' '. $select);
// If we're caching records, store this one (supposing we got something - we don't cache failures)
if ($record && $docache) {
$record_cache[$table][$value1] = $record;
}
return $record;
}
/**
@ -1022,6 +1041,10 @@ function set_field($table, $newfield, $newvalue, $field1, $value1, $field2='', $
}
}
// Clear entire record cache for table (could be improved to check for ID limitation)
global $record_cache;
unset($record_cache[$table]);
/// Arriving here, standard update
return $db->Execute('UPDATE '. $CFG->prefix . $table .' SET '. $newfield .' = \''. $newvalue .'\' '. $select);
}
@ -1276,6 +1299,10 @@ function update_record($table, $dataobject) {
return false;
}
// Remove this record from record cache since it will change
global $record_cache;
unset($record_cache[$table][$dataobject->id]);
/// Temporary hack as part of phasing out all access to obsolete user tables XXX
if (!empty($CFG->rolesactive)) {
if (in_array($table, array('user_students', 'user_teachers', 'user_coursecreators', 'user_admins'))) {