<?php use \Friendica\Core\System; use Friendica\Database\DBM; require_once('include/datetime.php'); /** * @class MySQL database class * * This class is for the low level database stuff that does driver specific things. */ class dba { public static $connected = true; private static $_server_info = ''; private static $db; private static $driver; private static $error = false; private static $errorno = 0; private static $affected_rows = 0; private static $in_transaction = false; private static $relation = array(); public static function connect($serveraddr, $user, $pass, $db, $install = false) { if (!is_null(self::$db)) { return true; } $a = get_app(); $stamp1 = microtime(true); $serveraddr = trim($serveraddr); $serverdata = explode(':', $serveraddr); $server = $serverdata[0]; if (count($serverdata) > 1) { $port = trim($serverdata[1]); } $server = trim($server); $user = trim($user); $pass = trim($pass); $db = trim($db); if (!(strlen($server) && strlen($user))) { self::$connected = false; self::$db = null; return false; } if ($install) { if (strlen($server) && ($server !== 'localhost') && ($server !== '127.0.0.1')) { if (! dns_get_record($server, DNS_A + DNS_CNAME + DNS_PTR)) { self::$error = sprintf(t('Cannot locate DNS info for database server \'%s\''), $server); self::$connected = false; self::$db = null; return false; } } } if (class_exists('\PDO') && in_array('mysql', PDO::getAvailableDrivers())) { self::$driver = 'pdo'; $connect = "mysql:host=".$server.";dbname=".$db; if (isset($port)) { $connect .= ";port=".$port; } if (isset($a->config["system"]["db_charset"])) { $connect .= ";charset=".$a->config["system"]["db_charset"]; } try { self::$db = @new PDO($connect, $user, $pass); self::$connected = true; } catch (PDOException $e) { self::$connected = false; } } if (!self::$connected && class_exists('mysqli')) { self::$driver = 'mysqli'; self::$db = @new mysqli($server, $user, $pass, $db, $port); if (!mysqli_connect_errno()) { self::$connected = true; if (isset($a->config["system"]["db_charset"])) { self::$db->set_charset($a->config["system"]["db_charset"]); } } } // No suitable SQL driver was found. if (!self::$connected) { self::$db = null; if (!$install) { system_unavailable(); } } $a->save_timestamp($stamp1, "network"); return true; } /** * @brief Returns the MySQL server version string * * This function discriminate between the deprecated mysql API and the current * object-oriented mysqli API. Example of returned string: 5.5.46-0+deb8u1 * * @return string */ public static function server_info() { if (self::$_server_info == '') { switch (self::$driver) { case 'pdo': self::$_server_info = self::$db->getAttribute(PDO::ATTR_SERVER_VERSION); break; case 'mysqli': self::$_server_info = self::$db->server_info; break; } } return self::$_server_info; } /** * @brief Returns the selected database name * * @return string */ public static function database_name() { $ret = self::p("SELECT DATABASE() AS `db`"); $data = self::inArray($ret); return $data[0]['db']; } /** * @brief Analyze a database query and log this if some conditions are met. * * @param string $query The database query that will be analyzed */ private static function log_index($query) { $a = get_app(); if (empty($a->config["system"]["db_log_index"])) { return; } // Don't explain an explain statement if (strtolower(substr($query, 0, 7)) == "explain") { return; } // Only do the explain on "select", "update" and "delete" if (!in_array(strtolower(substr($query, 0, 6)), array("select", "update", "delete"))) { return; } $r = self::p("EXPLAIN ".$query); if (!DBM::is_result($r)) { return; } $watchlist = explode(',', $a->config["system"]["db_log_index_watch"]); $blacklist = explode(',', $a->config["system"]["db_log_index_blacklist"]); while ($row = dba::fetch($r)) { if ((intval($a->config["system"]["db_loglimit_index"]) > 0)) { $log = (in_array($row['key'], $watchlist) && ($row['rows'] >= intval($a->config["system"]["db_loglimit_index"]))); } else { $log = false; } if ((intval($a->config["system"]["db_loglimit_index_high"]) > 0) && ($row['rows'] >= intval($a->config["system"]["db_loglimit_index_high"]))) { $log = true; } if (in_array($row['key'], $blacklist) || ($row['key'] == "")) { $log = false; } if ($log) { $backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS); @file_put_contents($a->config["system"]["db_log_index"], datetime_convert()."\t". $row['key']."\t".$row['rows']."\t".$row['Extra']."\t". basename($backtrace[1]["file"])."\t". $backtrace[1]["line"]."\t".$backtrace[2]["function"]."\t". substr($query, 0, 2000)."\n", FILE_APPEND); } } } public static function escape($str) { switch (self::$driver) { case 'pdo': return substr(@self::$db->quote($str, PDO::PARAM_STR), 1, -1); case 'mysqli': return @self::$db->real_escape_string($str); } } public static function connected() { $connected = false; switch (self::$driver) { case 'pdo': $r = dba::p("SELECT 1"); if (DBM::is_result($r)) { $row = dba::inArray($r); $connected = ($row[0]['1'] == '1'); } break; case 'mysqli': $connected = self::$db->ping(); break; } return $connected; } /** * @brief Replaces ANY_VALUE() function by MIN() function, * if the database server does not support ANY_VALUE(). * * Considerations for Standard SQL, or MySQL with ONLY_FULL_GROUP_BY (default since 5.7.5). * ANY_VALUE() is available from MySQL 5.7.5 https://dev.mysql.com/doc/refman/5.7/en/miscellaneous-functions.html * A standard fall-back is to use MIN(). * * @param string $sql An SQL string without the values * @return string The input SQL string modified if necessary. */ public static function any_value_fallback($sql) { $server_info = self::server_info(); if (version_compare($server_info, '5.7.5', '<') || (stripos($server_info, 'MariaDB') !== false)) { $sql = str_ireplace('ANY_VALUE(', 'MIN(', $sql); } 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 $sql An SQL string without the values * @return string The input SQL string modified if necessary. */ public static function clean_query($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 * * @param string $sql SQL query * @param array $args The parameters that are to replace the ? placeholders * @return string The replaced SQL query */ private static function replace_parameters($sql, $args) { $offset = 0; foreach ($args AS $param => $value) { if (is_int($args[$param]) || is_float($args[$param])) { $replace = intval($args[$param]); } else { $replace = "'".self::escape($args[$param])."'"; } $pos = strpos($sql, '?', $offset); if ($pos !== false) { $sql = substr_replace($sql, $replace, $pos, 1); } $offset = $pos + strlen($replace); } return $sql; } /** * @brief Convert parameter array to an universal form * @param array $args Parameter array * @return array universalized parameter array */ private static function getParam($args) { unset($args[0]); // When the second function parameter is an array then use this as the parameter array if ((count($args) > 0) && (is_array($args[1]))) { return $args[1]; } else { return $args; } } /** * @brief Executes a prepared statement that returns data * @usage Example: $r = p("SELECT * FROM `item` WHERE `guid` = ?", $guid); * * Please only use it with complicated queries. * For all regular queries please use dba::select or dba::exists * * @param string $sql SQL statement * @return object statement object */ public static function p($sql) { $a = get_app(); $stamp1 = microtime(true); $params = self::getParam(func_get_args()); // Renumber the array keys to be sure that they fit $i = 0; $args = array(); foreach ($params AS $param) { // Avoid problems with some MySQL servers and boolean values. See issue #3645 if (is_bool($param)) { $param = (int)$param; } $args[++$i] = $param; } if (!self::$connected) { return false; } if ((substr_count($sql, '?') != count($args)) && (count($args) > 0)) { // Question: Should we continue or stop the query here? logger('Parameter mismatch. Query "'.$sql.'" - Parameters '.print_r($args, true), LOGGER_DEBUG); } $sql = self::clean_query($sql); $sql = self::any_value_fallback($sql); $orig_sql = $sql; if (x($a->config,'system') && x($a->config['system'], 'db_callstack')) { $sql = "/*".System::callstack()." */ ".$sql; } self::$error = ''; self::$errorno = 0; self::$affected_rows = 0; // We have to make some things different if this function is called from "e" $trace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 2); if (isset($trace[1])) { $called_from = $trace[1]; } else { // We use just something that is defined to avoid warnings $called_from = $trace[0]; } // We are having an own error logging in the function "e" $called_from_e = ($called_from['function'] == 'e'); switch (self::$driver) { case 'pdo': // If there are no arguments we use "query" if (count($args) == 0) { if (!$retval = self::$db->query($sql)) { $errorInfo = self::$db->errorInfo(); self::$error = $errorInfo[2]; self::$errorno = $errorInfo[1]; $retval = false; break; } self::$affected_rows = $retval->rowCount(); break; } if (!$stmt = self::$db->prepare($sql)) { $errorInfo = self::$db->errorInfo(); self::$error = $errorInfo[2]; self::$errorno = $errorInfo[1]; $retval = false; break; } foreach ($args AS $param => $value) { $stmt->bindParam($param, $args[$param]); } if (!$stmt->execute()) { $errorInfo = $stmt->errorInfo(); self::$error = $errorInfo[2]; self::$errorno = $errorInfo[1]; $retval = false; } else { $retval = $stmt; self::$affected_rows = $retval->rowCount(); } break; case 'mysqli': // There are SQL statements that cannot be executed with a prepared statement $parts = explode(' ', $orig_sql); $command = strtolower($parts[0]); $can_be_prepared = in_array($command, array('select', 'update', 'insert', 'delete')); // The fallback routine is called as well when there are no arguments if (!$can_be_prepared || (count($args) == 0)) { $retval = self::$db->query(self::replace_parameters($sql, $args)); if (self::$db->errno) { self::$error = self::$db->error; self::$errorno = self::$db->errno; $retval = false; } else { if (isset($retval->num_rows)) { self::$affected_rows = $retval->num_rows; } else { self::$affected_rows = self::$db->affected_rows; } } break; } $stmt = self::$db->stmt_init(); if (!$stmt->prepare($sql)) { self::$error = $stmt->error; self::$errorno = $stmt->errno; $retval = false; break; } $params = ''; $values = array(); foreach ($args AS $param => $value) { if (is_int($args[$param])) { $params .= 'i'; } elseif (is_float($args[$param])) { $params .= 'd'; } elseif (is_string($args[$param])) { $params .= 's'; } else { $params .= 'b'; } $values[] = &$args[$param]; } if (count($values) > 0) { array_unshift($values, $params); call_user_func_array(array($stmt, 'bind_param'), $values); } if (!$stmt->execute()) { self::$error = self::$db->error; self::$errorno = self::$db->errno; $retval = false; } else { $stmt->store_result(); $retval = $stmt; self::$affected_rows = $retval->affected_rows; } break; } // We are having an own error logging in the function "e" if ((self::$errorno != 0) && !$called_from_e) { // We have to preserve the error code, somewhere in the logging it get lost $error = self::$error; $errorno = self::$errorno; logger('DB Error '.self::$errorno.': '.self::$error."\n". System::callstack(8)."\n".self::replace_parameters($sql, $params)); self::$error = $error; self::$errorno = $errorno; } $a->save_timestamp($stamp1, 'database'); if (x($a->config,'system') && x($a->config['system'], 'db_log')) { $stamp2 = microtime(true); $duration = (float)($stamp2 - $stamp1); if (($duration > $a->config["system"]["db_loglimit"])) { $duration = round($duration, 3); $backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS); @file_put_contents($a->config["system"]["db_log"], datetime_convert()."\t".$duration."\t". basename($backtrace[1]["file"])."\t". $backtrace[1]["line"]."\t".$backtrace[2]["function"]."\t". substr(self::replace_parameters($sql, $args), 0, 2000)."\n", FILE_APPEND); } } return $retval; } /** * @brief Executes a prepared statement like UPDATE or INSERT that doesn't return data * * Please use dba::delete, dba::insert, dba::update, ... instead * * @param string $sql SQL statement * @return boolean Was the query successfull? False is returned only if an error occurred */ public static function e($sql) { $a = get_app(); $stamp = microtime(true); $params = self::getParam(func_get_args()); // In a case of a deadlock we are repeating the query 20 times $timeout = 20; do { $stmt = self::p($sql, $params); if (is_bool($stmt)) { $retval = $stmt; } elseif (is_object($stmt)) { $retval = true; } else { $retval = false; } self::close($stmt); } while ((self::$errorno == 1213) && (--$timeout > 0)); if (self::$errorno != 0) { // We have to preserve the error code, somewhere in the logging it get lost $error = self::$error; $errorno = self::$errorno; logger('DB Error '.self::$errorno.': '.self::$error."\n". System::callstack(8)."\n".self::replace_parameters($sql, $params)); self::$error = $error; self::$errorno = $errorno; } $a->save_timestamp($stamp, "database_write"); return $retval; } /** * @brief Check if data exists * * @param string $table Table name * @param array $condition array of fields for condition * * @return boolean Are there rows for that condition? */ public static function exists($table, $condition) { if (empty($table)) { return false; } $fields = array(); $array_element = each($condition); $array_key = $array_element['key']; if (!is_int($array_key)) { $fields = array($array_key); } $stmt = self::select($table, $fields, $condition, array('limit' => 1, 'only_query' => true)); if (is_bool($stmt)) { $retval = $stmt; } else { $retval = (self::num_rows($stmt) > 0); } self::close($stmt); return $retval; } /** * @brief Fetches the first row * * Please use dba::select or dba::exists whenever this is possible. * * @param string $sql SQL statement * @return array first row of query */ public static function fetch_first($sql) { $params = self::getParam(func_get_args()); $stmt = self::p($sql, $params); if (is_bool($stmt)) { $retval = $stmt; } else { $retval = self::fetch($stmt); } self::close($stmt); return $retval; } /** * @brief Returns the number of affected rows of the last statement * * @return int Number of rows */ public static function affected_rows() { return self::$affected_rows; } /** * @brief Returns the number of columns of a statement * * @param object Statement object * @return int Number of columns */ public static function columnCount($stmt) { if (!is_object($stmt)) { return 0; } switch (self::$driver) { case 'pdo': return $stmt->columnCount(); case 'mysqli': return $stmt->field_count; } return 0; } /** * @brief Returns the number of rows of a statement * * @param object Statement object * @return int Number of rows */ public static function num_rows($stmt) { if (!is_object($stmt)) { return 0; } switch (self::$driver) { case 'pdo': return $stmt->rowCount(); case 'mysqli': return $stmt->num_rows; } return 0; } /** * @brief Fetch a single row * * @param object $stmt statement object * @return array current row */ public static function fetch($stmt) { if (!is_object($stmt)) { return false; } switch (self::$driver) { case 'pdo': return $stmt->fetch(PDO::FETCH_ASSOC); case 'mysqli': if (get_class($stmt) == 'mysqli_result') { return $stmt->fetch_assoc(); } // This code works, but is slow // Bind the result to a result array $cols = array(); $cols_num = array(); for ($x = 0; $x < $stmt->field_count; $x++) { $cols[] = &$cols_num[$x]; } call_user_func_array(array($stmt, 'bind_result'), $cols); if (!$stmt->fetch()) { return false; } // The slow part: // We need to get the field names for the array keys // It seems that there is no better way to do this. $result = $stmt->result_metadata(); $fields = $result->fetch_fields(); $columns = array(); foreach ($cols_num AS $param => $col) { $columns[$fields[$param]->name] = $col; } return $columns; } } /** * @brief Insert a row into a table * * @param string $table Table name * @param array $param parameter array * @param bool $on_duplicate_update Do an update on a duplicate entry * * @return boolean was the insert successfull? */ public static function insert($table, $param, $on_duplicate_update = false) { if (empty($table) || empty($param)) { logger('Table and fields have to be set'); return false; } $sql = "INSERT INTO `".self::escape($table)."` (`".implode("`, `", array_keys($param))."`) VALUES (". substr(str_repeat("?, ", count($param)), 0, -2).")"; if ($on_duplicate_update) { $sql .= " ON DUPLICATE KEY UPDATE `".implode("` = ?, `", array_keys($param))."` = ?"; $values = array_values($param); $param = array_merge_recursive($values, $values); } return self::e($sql, $param); } /** * @brief Fetch the id of the last insert command * * @return integer Last inserted id */ public static function lastInsertId() { switch (self::$driver) { case 'pdo': $id = self::$db->lastInsertId(); break; case 'mysqli': $id = self::$db->insert_id; break; } return $id; } /** * @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 $table Table name * * @return boolean was the lock successful? */ public static function lock($table) { // See here: https://dev.mysql.com/doc/refman/5.7/en/lock-tables-and-transactions.html self::e("SET autocommit=0"); $success = self::e("LOCK TABLES `".self::escape($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? */ public static 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 $success; } /** * @brief Starts a transaction * * @return boolean Was the command executed successfully? */ public static function transaction() { if (!self::e('COMMIT')) { return false; } if (!self::e('START TRANSACTION')) { return false; } self::$in_transaction = true; return true; } /** * @brief Does a commit * * @return boolean Was the command executed successfully? */ public static function commit() { if (!self::e('COMMIT')) { return false; } self::$in_transaction = false; return true; } /** * @brief Does a rollback * * @return boolean Was the command executed successfully? */ public static function rollback() { if (!self::e('ROLLBACK')) { return false; } self::$in_transaction = false; return true; } /** * @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. */ private static 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 Delete a row from a table * * @param string $table Table name * @param array $param parameter array * @param boolean $in_process Internal use: Only do a commit after the last delete * @param array $callstack Internal use: prevent endless loops * * @return boolean|array was the delete successfull? When $in_process is set: deletion data */ public static function delete($table, $param, $in_process = false, &$callstack = array()) { if (empty($table) || empty($param)) { logger('Table and condition have to be set'); return false; } $commands = 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 $commands; } $callstack[$key] = true; $table = self::escape($table); $commands[$key] = array('table' => $table, 'param' => $param); // To speed up the whole process we cache the table relations if (count(self::$relation) == 0) { self::build_relation_data(); } // Is there a relation entry for the table? if (isset(self::$relation[$table])) { // We only allow a simple "one field" relation. $field = array_keys(self::$relation[$table])[0]; $rel_def = array_values(self::$relation[$table])[0]; // Create a key for preventing double queries $qkey = $field.'-'.$table.':'.implode(':', array_keys($param)).':'.implode(':', $param); // When the search field is the relation field, we don't need to fetch the rows // This is useful when the leading record is already deleted in the frontend but the rest is done in the backend if ((count($param) == 1) && ($field == array_keys($param)[0])) { foreach ($rel_def AS $rel_table => $rel_fields) { foreach ($rel_fields AS $rel_field) { $retval = self::delete($rel_table, array($rel_field => array_values($param)[0]), true, $callstack); $commands = array_merge($commands, $retval); } } // We quit when this key already exists in the callstack. } elseif (!isset($callstack[$qkey])) { $callstack[$qkey] = true; // Fetch all rows that are to be deleted $data = self::select($table, array($field), $param); while ($row = self::fetch($data)) { // Now we accumulate the delete commands $retval = self::delete($table, array($field => $row[$field]), true, $callstack); $commands = array_merge($commands, $retval); } self::close($data); // Since we had split the delete command we don't need the original command anymore unset($commands[$key]); } } if (!$in_process) { // Now we finalize the process $do_transaction = !self::$in_transaction; if ($do_transaction) { self::transaction(); } $compacted = array(); $counter = array(); foreach ($commands AS $command) { $condition = $command['param']; $array_element = each($condition); $array_key = $array_element['key']; if (is_int($array_key)) { $condition_string = " WHERE ".array_shift($condition); } else { $condition_string = " WHERE `".implode("` = ? AND `", array_keys($condition))."` = ?"; } if ((count($command['param']) > 1) || is_int($array_key)) { $sql = "DELETE FROM `".$command['table']."`".$condition_string; logger(self::replace_parameters($sql, $condition), LOGGER_DATA); if (!self::e($sql, $condition)) { if ($do_transaction) { self::rollback(); } return false; } } else { $key_table = $command['table']; $key_param = array_keys($command['param'])[0]; $value = array_values($command['param'])[0]; // Split the SQL queries in chunks of 100 values // We do the $i stuff here to make the code better readable $i = $counter[$key_table][$key_param]; if (count($compacted[$key_table][$key_param][$i]) > 100) { ++$i; } $compacted[$key_table][$key_param][$i][$value] = $value; $counter[$key_table][$key_param] = $i; } } foreach ($compacted AS $table => $values) { foreach ($values AS $field => $field_value_list) { foreach ($field_value_list AS $field_values) { $sql = "DELETE FROM `".$table."` WHERE `".$field."` IN (". substr(str_repeat("?, ", count($field_values)), 0, -2).");"; logger(self::replace_parameters($sql, $field_values), LOGGER_DATA); if (!self::e($sql, $field_values)) { if ($do_transaction) { self::rollback(); } return false; } } } } if ($do_transaction) { self::commit(); } return true; } return $commands; } /** * @brief Updates rows * * Updates rows in the database. When $old_fields is set to an array, * the system will only do an update if the fields in that array changed. * * Attention: * Only the values in $old_fields are compared. * This is an intentional behaviour. * * Example: * We include the timestamp field in $fields but not in $old_fields. * Then the row will only get the new timestamp when the other fields had changed. * * When $old_fields is set to a boolean value the system will do this compare itself. * When $old_fields is set to "true" the system will do an insert if the row doesn't exists. * * Attention: * Only set $old_fields to a boolean value when you are sure that you will update a single row. * When you set $old_fields to "true" then $fields must contain all relevant fields! * * @param string $table Table name * @param array $fields contains the fields that are updated * @param array $condition condition array with the key values * @param array|boolean $old_fields array with the old field values that are about to be replaced (true = update on duplicate) * * @return boolean was the update successfull? */ public static function update($table, $fields, $condition, $old_fields = array()) { if (empty($table) || empty($fields) || empty($condition)) { logger('Table, fields and condition have to be set'); return false; } $table = self::escape($table); $array_element = each($condition); $array_key = $array_element['key']; if (is_int($array_key)) { $condition_string = " WHERE ".array_shift($condition); } else { $condition_string = " WHERE `".implode("` = ? AND `", array_keys($condition))."` = ?"; } if (is_bool($old_fields)) { $do_insert = $old_fields; $old_fields = self::select($table, array(), $condition, array('limit' => 1)); if (is_bool($old_fields)) { if ($do_insert) { $values = array_merge($condition, $fields); return self::insert($table, $values, $do_insert); } $old_fields = array(); } } $do_update = (count($old_fields) == 0); foreach ($old_fields AS $fieldname => $content) { if (isset($fields[$fieldname])) { if ($fields[$fieldname] == $content) { unset($fields[$fieldname]); } else { $do_update = true; } } } if (!$do_update || (count($fields) == 0)) { return true; } $sql = "UPDATE `".$table."` SET `". implode("` = ?, `", array_keys($fields))."` = ?".$condition_string; $params1 = array_values($fields); $params2 = array_values($condition); $params = array_merge_recursive($params1, $params2); return self::e($sql, $params); } /** * @brief Select rows from a table * * @param string $table Table name * @param array $fields array of selected fields * @param array $condition array of fields for condition * @param array $params array of several parameters * * @return boolean|object If "limit" is equal "1" only a single row is returned, else a query object is returned * * Example: * $table = "item"; * $fields = array("id", "uri", "uid", "network"); * * $condition = array("uid" => 1, "network" => 'dspr'); * or: * $condition = array("`uid` = ? AND `network` IN (?, ?)", 1, 'dfrn', 'dspr'); * * $params = array("order" => array("id", "received" => true), "limit" => 1); * * $data = dba::select($table, $fields, $condition, $params); */ public static function select($table, $fields = array(), $condition = array(), $params = array()) { if ($table == '') { return false; } if (count($fields) > 0) { $select_fields = "`".implode("`, `", array_values($fields))."`"; } else { $select_fields = "*"; } if (count($condition) > 0) { $array_element = each($condition); $array_key = $array_element['key']; if (is_int($array_key)) { $condition_string = " WHERE ".array_shift($condition); } else { $condition_string = " WHERE `".implode("` = ? AND `", array_keys($condition))."` = ?"; } } else { $condition_string = ""; } $param_string = ''; $single_row = false; if (isset($params['order'])) { $param_string .= " ORDER BY "; foreach ($params['order'] AS $fields => $order) { if (!is_int($fields)) { $param_string .= "`".$fields."` ".($order ? "DESC" : "ASC").", "; } else { $param_string .= "`".$order."`, "; } } $param_string = substr($param_string, 0, -2); } if (isset($params['limit']) && is_int($params['limit'])) { $param_string .= " LIMIT ".$params['limit']; $single_row = ($params['limit'] == 1); } if (isset($params['only_query']) && $params['only_query']) { $single_row = !$params['only_query']; } $sql = "SELECT ".$select_fields." FROM `".$table."`".$condition_string.$param_string; $result = self::p($sql, $condition); if (is_bool($result) || !$single_row) { return $result; } else { $row = self::fetch($result); self::close($result); return $row; } } /** * @brief Fills an array with data from a query * * @param object $stmt statement object * @return array Data array */ public static function inArray($stmt, $do_close = true) { if (is_bool($stmt)) { return $stmt; } $data = array(); while ($row = self::fetch($stmt)) { $data[] = $row; } if ($do_close) { self::close($stmt); } return $data; } /** * @brief Returns the error number of the last query * * @return string Error number (0 if no error) */ public static function errorNo() { return self::$errorno; } /** * @brief Returns the error message of the last query * * @return string Error message ('' if no error) */ public static function errorMessage() { return self::$error; } /** * @brief Closes the current statement * * @param object $stmt statement object * @return boolean was the close successfull? */ public static function close($stmt) { if (!is_object($stmt)) { return false; } switch (self::$driver) { case 'pdo': return $stmt->closeCursor(); case 'mysqli': $stmt->free_result(); return $stmt->close(); } } } function dbesc($str) { if (dba::$connected) { return(dba::escape($str)); } else { return(str_replace("'","\\'",$str)); } } /** * @brief execute SQL query with printf style args - deprecated * * Please use the dba:: functions instead: * dba::select, dba::exists, dba::insert * dba::delete, dba::update, dba::p, dba::e * * @param $args Query parameters (1 to N parameters of different types) * @return array Query array */ function q($sql) { $args = func_get_args(); unset($args[0]); if (!dba::$connected) { return false; } $sql = dba::clean_query($sql); $sql = dba::any_value_fallback($sql); $stmt = @vsprintf($sql, $args); $ret = dba::p($stmt); if (is_bool($ret)) { return $ret; } $columns = dba::columnCount($ret); $data = dba::inArray($ret); if ((count($data) == 0) && ($columns == 0)) { return true; } return $data; } function dba_timer() { return microtime(true); }