Merge pull request #3526 from annando/bugfix-index

[friendica.git] / include / dba.php

diff --git a/include/dba.php b/include/dba.php
index 3af8522516c64ca9f4306cdff9b836f02302bfac..1f428bf4651b2b43ed0c47dc785761b3b0d1d443 100644 (file)
--- a/include/dba.php
+++ b/include/dba.php
@@ -459,6 +459,27 @@ class dba {
                return $sql;
        }
 
+       /**
+        * @brief beautifies the query - useful for "SHOW PROCESSLIST"
+        *
+        * This is safe when we bind the parameters later.
+        * The parameter values aren't part of the SQL.
+        *
+        * @param string $sql An SQL string without the values
+        * @return string The input SQL string modified if necessary.
+        */
+       public function clean_query($sql) {
+               $search = array("\t", "\n", "\r", "  ");
+               $replace = array(' ', ' ', ' ', ' ');
+               do {
+                       $oldsql = $sql;
+                       $sql = str_replace($search, $replace, $sql);
+               } while ($oldsql != $sql);
+
+               return $sql;
+       }
+
+
        /**
         * @brief Replaces the ? placeholders with the parameters in the $args array
         *
@@ -521,6 +542,7 @@ class dba {
                        logger('Parameter mismatch. Query "'.$sql.'" - Parameters '.print_r($args, true), LOGGER_DEBUG);
                }
 
+               $sql = self::$dbo->clean_query($sql);
                $sql = self::$dbo->any_value_fallback($sql);
 
                if (x($a->config,'system') && x($a->config['system'], 'db_callstack')) {
@@ -708,6 +730,9 @@ class dba {
         * @return int Number of rows
         */
        static public function num_rows($stmt) {
+               if (!is_object($stmt)) {
+                       return 0;
+               }
                switch (self::$dbo->driver) {
                        case 'pdo':
                                return $stmt->rowCount();
@@ -781,6 +806,41 @@ class dba {
                return self::e($sql, $param);
        }
 
+       /**
+        * @brief Locks a table for exclusive write access
+        *
+        * This function can be extended in the future to accept a table array as well.
+        *
+        * @param string $table Table name
+        *
+        * @return boolean was the lock successful?
+        */
+       static public function lock($table) {
+               // See here: https://dev.mysql.com/doc/refman/5.7/en/lock-tables-and-transactions.html
+               self::e("SET autocommit=0");
+               $success = self::e("LOCK TABLES `".self::$dbo->escape($table)."` WRITE");
+               if (!$success) {
+                       self::e("SET autocommit=1");
+               } else {
+                       self::$in_transaction = true;
+               }
+               return $success;
+       }
+
+       /**
+        * @brief Unlocks all locked tables
+        *
+        * @return boolean was the unlock successful?
+        */
+       static public function unlock() {
+               // See here: https://dev.mysql.com/doc/refman/5.7/en/lock-tables-and-transactions.html
+               self::e("COMMIT");
+               $success = self::e("UNLOCK TABLES");
+               self::e("SET autocommit=1");
+               self::$in_transaction = false;
+               return $success;
+       }
+
        /**
         * @brief Starts a transaction
         *
@@ -1200,6 +1260,7 @@ function q($sql) {
        unset($args[0]);
 
        if ($db && $db->connected) {
+               $sql = $db->clean_query($sql);
                $sql = $db->any_value_fallback($sql);
                $stmt = @vsprintf($sql,$args); // Disabled warnings
                //logger("dba: q: $stmt", LOGGER_ALL);
@@ -1237,6 +1298,7 @@ function qu($sql) {
        unset($args[0]);
 
        if ($db && $db->connected) {
+               $sql = $db->clean_query($sql);
                $sql = $db->any_value_fallback($sql);
                $stmt = @vsprintf($sql,$args); // Disabled warnings
                if ($stmt === false)