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Delete now works

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This commit is contained in:
Michael 2017-04-30 19:54:41 +00:00
parent 44beb62e5a
commit c2820c452f
2 changed files with 98 additions and 2 deletions
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96
include/dba.php
View file

@ -23,6 +23,7 @@ class dba {
public $error = false;
private $_server_info = '';
private static $dbo;
private static $relation = array();
function __construct($server, $user, $pass, $db, $install = false) {
$a = get_app();
@ -753,6 +754,101 @@ class dba {
return self::e($sql, $param);
}
/**
* @brief Build the array with the table relations
*
* The array is build from the database definitions in dbstructure.php
*
* This process must only be started once, since the value is cached.
*/
static private function build_relation_data() {
$definition = db_definition();
foreach ($definition AS $table => $structure) {
foreach ($structure['fields'] AS $field => $field_struct) {
if (isset($field_struct['relation'])) {
foreach ($field_struct['relation'] AS $rel_table => $rel_field) {
self::$relation[$rel_table][$rel_field][$table] = $field;
}
}
}
}
}
/**
* @brief Insert a row into a table
*
* @param string $table Table name
* @param array $param parameter array
* @param boolean $in_commit Internal use: Only do a commit after the last delete
* @param array $callstack Internal use: prevent endless loops
*
* @return boolean was the delete successfull?
*/
static public function delete($table, $param, $in_commit = false, $callstack = array()) {
// Create a key for the loop prevention
$key = $table.':'.implode(':', array_keys($param)).':'.implode(':', $param);
// We quit when this key already exists in the callstack.
if (isset($callstack[$key])) {
return true;
}
$callstack[$key] = $key;
$table = self::$dbo->escape($table);
// To speed up the whole process we cache the table relations
if (count(self::$relation) == 0) {
self::build_relation_data();
}
if (!$in_commit) {
self::p("COMMIT");
self::p("START TRANSACTION");
}
// Is there a relation entry for the table?
if (isset(self::$relation[$table])) {
foreach (self::$relation[$table] AS $field => $rel_def) {
// Fetch all rows that are to be deleted
$sql = "SELECT ".self::$dbo->escape($field)." FROM `".$table."` WHERE `".
implode("` = ? AND `", array_keys($param))."` = ?";
$retval = false;
$data = self::p($sql, $param);
while ($row = self::fetch($data)) {
foreach ($rel_def AS $rel_table => $rel_field) {
// We do a separate delete process per row
$retval = self::delete($rel_table, array($rel_field => $row[$field]), true, $callstack);
if (!$retval) {
return false;
}
}
}
if (!$retval) {
return true;
}
}
}
$sql = "DELETE FROM `".$table."` WHERE `".
implode("` = ? AND `", array_keys($param))."` = ?";
$retval = self::e($sql, $param);
if (!$in_commit) {
if ($retval) {
self::p("COMMIT");
} else {
self::p("ROLLBACK");
}
}
return $retval;
}
/**
* @brief Updates rows
*

4
include/dbstructure.php
View file

@ -1078,7 +1078,7 @@ function db_definition() {
"type" => array("type" => "varchar(255)", "not null" => "1", "default" => ""),
"wall" => array("type" => "tinyint(1)", "not null" => "1", "default" => "0"),
"gravity" => array("type" => "tinyint(1)", "not null" => "1", "default" => "0"),
"parent" => array("type" => "int(10) unsigned", "not null" => "1", "default" => "0"),
"parent" => array("type" => "int(10) unsigned", "not null" => "1", "default" => "0", "relation" => array("item" => "id")),
"parent-uri" => array("type" => "varchar(255)", "not null" => "1", "default" => ""),
"extid" => array("type" => "varchar(255)", "not null" => "1", "default" => ""),
"thr-parent" => array("type" => "varchar(255)", "not null" => "1", "default" => ""),
@ -1284,7 +1284,7 @@ function db_definition() {
"notify-id" => array("type" => "int(11)", "not null" => "1", "default" => "0", "relation" => array("notify" => "id")),
"master-parent-item" => array("type" => "int(10) unsigned", "not null" => "1", "default" => "0", "relation" => array("item" => "id")),
"parent-item" => array("type" => "int(10) unsigned", "not null" => "1", "default" => "0"),
"receiver-uid" => array("type" => "int(11)", "not null" => "1", "default" => "0", "relation" => array("user" => "id")),
"receiver-uid" => array("type" => "int(11)", "not null" => "1", "default" => "0", "relation" => array("user" => "uid")),
),
"indexes" => array(
"PRIMARY" => array("id"),