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The number of queries is reduced dramatically

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Michael 2017-05-01 09:34:15 +00:00
parent e6cbe3be11
commit e90ae79d35
1 changed files with 71 additions and 46 deletions
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117
include/dba.php
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@ -783,80 +783,105 @@ class dba {
* @param boolean $in_commit Internal use: Only do a commit after the last delete * @param boolean $in_commit Internal use: Only do a commit after the last delete
* @param array $callstack Internal use: prevent endless loops * @param array $callstack Internal use: prevent endless loops
* *
* @return boolean was the delete successfull? * @return boolean|array was the delete successfull? When $in_commit is set: deletion data
*/ */
static public function delete($table, $param, $in_commit = false, $callstack = array()) { static public function delete($table, $param, $in_commit = false, $callstack = array()) {
$commands = array();
// Create a key for the loop prevention // Create a key for the loop prevention
$key = $table.':'.implode(':', array_keys($param)).':'.implode(':', $param); $key = $table.':'.implode(':', array_keys($param)).':'.implode(':', $param);
// We quit when this key already exists in the callstack. // We quit when this key already exists in the callstack.
if (isset($callstack[$key])) { if (isset($callstack[$key])) {
return true; return $commands;
} }
$callstack[$key] = $key; $callstack[$key] = $key;
$table = self::$dbo->escape($table); $table = self::$dbo->escape($table);
$commands[$key] = array('table' => $table, 'param' => $param);
// To speed up the whole process we cache the table relations // To speed up the whole process we cache the table relations
if (count(self::$relation) == 0) { if (count(self::$relation) == 0) {
self::build_relation_data(); self::build_relation_data();
} }
if (!$in_commit) {
self::p("COMMIT");
self::p("START TRANSACTION");
}
// Is there a relation entry for the table? // Is there a relation entry for the table?
if (isset(self::$relation[$table])) { if (isset(self::$relation[$table])) {
foreach (self::$relation[$table] AS $field => $rel_def) { // We only allow a simple "one field" relation.
// When the search field is the relation field, we don't need to fetch the rows $field = array_keys(self::$relation[$table])[0];
// This is useful when the leading record is already deleted in the frontend but the rest is done in the backend $rel_def = array_values(self::$relation[$table])[0];
if ((count($param) == 1) AND ($field == array_keys($param)[0])) {
foreach ($rel_def AS $rel_table => $rel_field) { // When the search field is the relation field, we don't need to fetch the rows
$retval = self::delete($rel_table, array($rel_field => array_values($param)[0]), true, $callstack); // This is useful when the leading record is already deleted in the frontend but the rest is done in the backend
if (!$retval) { if ((count($param) == 1) AND ($field == array_keys($param)[0])) {
return false; foreach ($rel_def AS $rel_table => $rel_field) {
} $retval = self::delete($rel_table, array($rel_field => array_values($param)[0]), true, $callstack);
$commands = array_merge($commands, $retval);
}
} else {
// 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)) {
// Now we accumulate the delete commands
$retval = self::delete($table, array($field => $row[$field]), true, $callstack);
$commands = array_merge($commands, $retval);
}
// When we don't find data then we don't need to delete it
if (is_bool($retval)) {
return $in_commit ? $commands : true;
}
// Since we had split the delete command we don't need the original command anymore
unset($commands[$key]);
}
}
if (!$in_commit) {
// Now we finalize the process
self::p("COMMIT");
self::p("START TRANSACTION");
$compacted = array();
foreach ($commands AS $command) {
if (count($command['param']) > 1) {
$sql = "DELETE FROM `".$command['table']."` WHERE `".
implode("` = ? AND `", array_keys($command['param']))."` = ?";
logger(dba::replace_parameters($sql, $command['param']), LOGGER_DATA);
if (!self::e($sql, $param)) {
self::p("ROLLBACK");
return false;
} }
} else { } else {
// Fetch all rows that are to be deleted $value = array_values($command['param'])[0];
$sql = "SELECT ".self::$dbo->escape($field)." FROM `".$table."` WHERE `". $compacted[$command['table']][array_keys($command['param'])[0]][$value] = $value;
implode("` = ? AND `", array_keys($param))."` = ?"; }
$retval = false; }
$data = self::p($sql, $param); foreach ($compacted AS $table => $values) {
while ($row = self::fetch($data)) { foreach ($values AS $field => $field_values) {
foreach ($rel_def AS $rel_table => $rel_field) { $sql = "DELETE FROM `".$table."` WHERE `".$field."` IN (".
// We have to do a separate delete process per row substr(str_repeat("?, ", count($field_values)), 0, -2).");";
$retval = self::delete($rel_table, array($rel_field => $row[$field]), true, $callstack);
if (!$retval) { logger(dba::replace_parameters($sql, $field_values), LOGGER_DATA);
return false;
} if (!self::e($sql, $param)) {
} self::p("ROLLBACK");
} return false;
if (!$retval) {
return true;
} }
} }
} }
self::p("COMMIT");
return true;
} }
$sql = "DELETE FROM `".$table."` WHERE `". return $commands;
implode("` = ? AND `", array_keys($param))."` = ?";
$retval = self::e($sql, $param);
if (!$in_commit) {
if ($retval) {
self::p("COMMIT");
} else {
self::p("ROLLBACK");
}
}
return $retval;
} }
/** /**