<?php
+/**
+ * @copyright Copyright (C) 2020, Friendica
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
namespace Friendica\Database;
-use Friendica\Core\Config\Cache\ConfigCache;
+use Exception;
+use Friendica\Core\Config\Cache;
use Friendica\Core\System;
+use Friendica\DI;
+use Friendica\Network\HTTPException\InternalServerErrorException;
use Friendica\Util\DateTimeFormat;
use Friendica\Util\Profiler;
use mysqli;
use Psr\Log\LoggerInterface;
/**
- * @class MySQL database class
- *
* This class is for the low level database stuff that does driver specific things.
*/
class Database
protected $connected = false;
/**
- * @var ConfigCache
+ * @var Cache
*/
protected $configCache;
/**
/** @var PDO|mysqli */
protected $connection;
protected $driver;
+ private $emulate_prepares = false;
private $error = false;
private $errorno = 0;
private $affected_rows = 0;
protected $in_transaction = false;
protected $in_retrial = false;
+ protected $testmode = false;
private $relation = [];
- public function __construct(ConfigCache $configCache, Profiler $profiler, LoggerInterface $logger, array $server = [])
+ public function __construct(Cache $configCache, Profiler $profiler, LoggerInterface $logger, array $server = [])
{
// We are storing these values for being able to perform a reconnect
$this->configCache = $configCache;
{
// Use environment variables for mysql if they are set beforehand
if (!empty($server['MYSQL_HOST'])
- && !empty($server['MYSQL_USERNAME'] || !empty($server['MYSQL_USER']))
+ && (!empty($server['MYSQL_USERNAME'] || !empty($server['MYSQL_USER'])))
&& $server['MYSQL_PASSWORD'] !== false
&& !empty($server['MYSQL_DATABASE']))
{
public function connect()
{
if (!is_null($this->connection) && $this->connected()) {
- return true;
+ return $this->connected;
}
+ // Reset connected state
+ $this->connected = false;
+
$port = 0;
$serveraddr = trim($this->configCache->get('database', 'hostname'));
$serverdata = explode(':', $serveraddr);
return false;
}
- if (class_exists('\PDO') && in_array('mysql', PDO::getAvailableDrivers())) {
+ $this->emulate_prepares = (bool)$this->configCache->get('database', 'emulate_prepares');
+ $this->pdo_emulate_prepares = (bool)$this->configCache->get('database', 'pdo_emulate_prepares');
+
+ if (!$this->configCache->get('database', 'disable_pdo') && class_exists('\PDO') && in_array('mysql', PDO::getAvailableDrivers())) {
$this->driver = 'pdo';
$connect = "mysql:host=" . $server . ";dbname=" . $db;
try {
$this->connection = @new PDO($connect, $user, $pass);
- $this->connection->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
+ $this->connection->setAttribute(PDO::ATTR_EMULATE_PREPARES, $this->pdo_emulate_prepares);
$this->connected = true;
} catch (PDOException $e) {
- /// @TODO At least log exception, don't ignore it!
+ $this->connected = false;
}
}
return $this->connected;
}
+ public function setTestmode(bool $test)
+ {
+ $this->testmode = $test;
+ }
/**
* Sets the logger for DBA
*
*/
public function disconnect()
{
- if (is_null($this->connection)) {
- return;
+ if (!is_null($this->connection)) {
+ switch ($this->driver) {
+ case 'pdo':
+ $this->connection = null;
+ break;
+ case 'mysqli':
+ $this->connection->close();
+ $this->connection = null;
+ break;
+ }
}
- switch ($this->driver) {
- case 'pdo':
- $this->connection = null;
- break;
- case 'mysqli':
- $this->connection->close();
- $this->connection = null;
- break;
- }
+ $this->driver = null;
+ $this->connected = false;
}
/**
}
/**
- * @brief Returns the MySQL server version string
+ * 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
}
/**
- * @brief Returns the selected database name
+ * Returns the selected database name
*
* @return string
* @throws \Exception
}
/**
- * @brief Analyze a database query and log this if some conditions are met.
+ * Analyze a database query and log this if some conditions are met.
*
* @param string $query The database query that will be analyzed
*
}
$watchlist = explode(',', $this->configCache->get('system', 'db_log_index_watch'));
- $blacklist = explode(',', $this->configCache->get('system', 'db_log_index_blacklist'));
+ $denylist = explode(',', $this->configCache->get('system', 'db_log_index_denylist'));
while ($row = $this->fetch($r)) {
if ((intval($this->configCache->get('system', 'db_loglimit_index')) > 0)) {
$log = true;
}
- if (in_array($row['key'], $blacklist) || ($row['key'] == "")) {
+ if (in_array($row['key'], $denylist) || ($row['key'] == "")) {
$log = false;
}
}
/**
- * Removes every not whitelisted character from the identifier string
+ * Removes every not allowlisted character from the identifier string
*
* @param string $identifier
*
$connected = $this->connection->ping();
break;
}
+
return $connected;
}
/**
- * @brief Replaces ANY_VALUE() function by MIN() function,
- * if the database server does not support ANY_VALUE().
+ * 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
}
/**
- * @brief Replaces the ? placeholders with the parameters in the $args array
+ * 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
{
$offset = 0;
foreach ($args AS $param => $value) {
- if (is_int($args[$param]) || is_float($args[$param])) {
+ if (is_int($args[$param]) || is_float($args[$param]) || is_bool($args[$param])) {
$replace = intval($args[$param]);
+ } elseif (is_null($args[$param])) {
+ $replace = 'NULL';
} else {
$replace = "'" . $this->escape($args[$param]) . "'";
}
}
/**
- * @brief Executes a prepared statement that returns data
+ * Executes a prepared statement that returns data
+ *
* @usage Example: $r = p("SELECT * FROM `item` WHERE `guid` = ?", $guid);
*
* Please only use it with complicated queries.
$sql = "/*" . System::callstack() . " */ " . $sql;
}
+ $is_error = false;
$this->error = '';
$this->errorno = 0;
$this->affected_rows = 0;
// We are having an own error logging in the function "e"
$called_from_e = ($called_from['function'] == 'e');
+ if (!isset($this->connection)) {
+ throw new InternalServerErrorException('The Connection is empty, although connected is set true.');
+ }
+
switch ($this->driver) {
case 'pdo':
// If there are no arguments we use "query"
- if (count($args) == 0) {
- if (!$retval = $this->connection->query($sql)) {
+ if ($this->emulate_prepares || count($args) == 0) {
+ if (!$retval = $this->connection->query($this->replaceParameters($sql, $args))) {
$errorInfo = $this->connection->errorInfo();
$this->error = $errorInfo[2];
$this->errorno = $errorInfo[1];
$retval = false;
+ $is_error = true;
break;
}
$this->affected_rows = $retval->rowCount();
$this->error = $errorInfo[2];
$this->errorno = $errorInfo[1];
$retval = false;
+ $is_error = true;
break;
}
$this->error = $errorInfo[2];
$this->errorno = $errorInfo[1];
$retval = false;
+ $is_error = true;
} else {
$retval = $stmt;
$this->affected_rows = $retval->rowCount();
$can_be_prepared = in_array($command, ['select', 'update', 'insert', 'delete']);
// The fallback routine is called as well when there are no arguments
- if (!$can_be_prepared || (count($args) == 0)) {
+ if ($this->emulate_prepares || !$can_be_prepared || (count($args) == 0)) {
$retval = $this->connection->query($this->replaceParameters($sql, $args));
if ($this->connection->errno) {
$this->error = $this->connection->error;
$this->errorno = $this->connection->errno;
$retval = false;
+ $is_error = true;
} else {
if (isset($retval->num_rows)) {
$this->affected_rows = $retval->num_rows;
$this->error = $stmt->error;
$this->errorno = $stmt->errno;
$retval = false;
+ $is_error = true;
break;
}
$this->error = $this->connection->error;
$this->errorno = $this->connection->errno;
$retval = false;
+ $is_error = true;
} else {
$stmt->store_result();
$retval = $stmt;
break;
}
+ // See issue https://github.com/friendica/friendica/issues/8572
+ // Ensure that we always get an error message on an error.
+ if ($is_error && empty($this->errorno)) {
+ $this->errorno = -1;
+ }
+
+ if ($is_error && empty($this->error)) {
+ $this->error = 'Unknown database error';
+ }
+
// We are having an own error logging in the function "e"
if (($this->errorno != 0) && !$called_from_e) {
// We have to preserve the error code, somewhere in the logging it get lost
$error = $this->error;
$errorno = $this->errorno;
+ if ($this->testmode) {
+ throw new Exception(DI::l10n()->t('Database error %d "%s" at "%s"', $errorno, $error, $this->replaceParameters($sql, $args)));
+ }
+
$this->logger->error('DB Error', [
- 'code' => $this->errorno,
- 'error' => $this->error,
+ 'code' => $errorno,
+ 'error' => $error,
'callstack' => System::callstack(8),
'params' => $this->replaceParameters($sql, $args),
]);
// It doesn't make sense to continue when the database connection was lost
if ($this->in_retrial) {
$this->logger->notice('Giving up retrial because of database error', [
- 'code' => $this->errorno,
- 'error' => $this->error,
+ 'code' => $errorno,
+ 'error' => $error,
]);
} else {
$this->logger->notice('Couldn\'t reconnect after database error', [
- 'code' => $this->errorno,
- 'error' => $this->error,
+ 'code' => $errorno,
+ 'error' => $error,
]);
}
exit(1);
} else {
// We try it again
$this->logger->notice('Reconnected after database error', [
- 'code' => $this->errorno,
- 'error' => $this->error,
+ 'code' => $errorno,
+ 'error' => $error,
]);
$this->in_retrial = true;
$ret = $this->p($sql, $args);
}
/**
- * @brief Executes a prepared statement like UPDATE or INSERT that doesn't return data
+ * Executes a prepared statement like UPDATE or INSERT that doesn't return data
*
* Please use DBA::delete, DBA::insert, DBA::update, ... instead
*
$error = $this->error;
$errorno = $this->errorno;
+ if ($this->testmode) {
+ throw new Exception(DI::l10n()->t('Database error %d "%s" at "%s"', $errorno, $error, $this->replaceParameters($sql, $params)));
+ }
+
$this->logger->error('DB Error', [
- 'code' => $this->errorno,
- 'error' => $this->error,
+ 'code' => $errorno,
+ 'error' => $error,
'callstack' => System::callstack(8),
'params' => $this->replaceParameters($sql, $params),
]);
// A reconnect like in $this->p could be dangerous with modifications
if ($errorno == 2006) {
$this->logger->notice('Giving up because of database error', [
- 'code' => $this->errorno,
- 'error' => $this->error,
+ 'code' => $errorno,
+ 'error' => $error,
]);
exit(1);
}
}
/**
- * @brief Check if data exists
+ * Check if data exists
*
- * @param string $table Table name
- * @param array $condition array of fields for condition
+ * @param string|array $table Table name or array [schema => table]
+ * @param array $condition array of fields for condition
*
* @return boolean Are there rows for that condition?
* @throws \Exception
*
* Please use DBA::selectFirst or DBA::exists whenever this is possible.
*
- * @brief Fetches the first row
+ * Fetches the first row
*
* @param string $sql SQL statement
*
}
/**
- * @brief Returns the number of affected rows of the last statement
+ * Returns the number of affected rows of the last statement
*
* @return int Number of rows
*/
}
/**
- * @brief Returns the number of columns of a statement
+ * Returns the number of columns of a statement
*
* @param object Statement object
*
}
/**
- * @brief Returns the number of rows of a statement
+ * Returns the number of rows of a statement
*
* @param PDOStatement|mysqli_result|mysqli_stmt Statement object
*
}
/**
- * @brief Fetch a single row
+ * Fetch a single row
*
* @param mixed $stmt statement object
*
}
/**
- * @brief Insert a row into a table
- *
- * @param string/array $table Table name
- *
- * @return string formatted and sanitzed table name
- * @throws \Exception
- */
- public function formatTableName($table)
- {
- if (is_string($table)) {
- return "`" . $this->sanitizeIdentifier($table) . "`";
- }
-
- if (!is_array($table)) {
- return '';
- }
-
- $scheme = key($table);
-
- return "`" . $this->sanitizeIdentifier($scheme) . "`.`" . $this->sanitizeIdentifier($table[$scheme]) . "`";
- }
-
- /**
- * @brief Insert a row into a table
+ * 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
+ * @param string|array $table Table name or array [schema => table]
+ * @param array $param parameter array
+ * @param bool $on_duplicate_update Do an update on a duplicate entry
*
* @return boolean was the insert successful?
* @throws \Exception
*/
- public function insert($table, $param, $on_duplicate_update = false)
+ public function insert($table, array $param, bool $on_duplicate_update = false)
{
-
if (empty($table) || empty($param)) {
$this->logger->info('Table and fields have to be set');
return false;
}
- $sql = "INSERT INTO " . $this->formatTableName($table) . " (`" . implode("`, `", array_keys($param)) . "`) VALUES (" .
- substr(str_repeat("?, ", count($param)), 0, -2) . ")";
+ $table_string = DBA::buildTableString($table);
+
+ $fields_string = implode(', ', array_map([DBA::class, 'quoteIdentifier'], array_keys($param)));
+
+ $values_string = substr(str_repeat("?, ", count($param)), 0, -2);
+
+ $sql = "INSERT INTO " . $table_string . " (" . $fields_string . ") VALUES (" . $values_string . ")";
if ($on_duplicate_update) {
- $sql .= " ON DUPLICATE KEY UPDATE `" . implode("` = ?, `", array_keys($param)) . "` = ?";
+ $fields_string = implode(' = ?, ', array_map([DBA::class, 'quoteIdentifier'], array_keys($param)));
+
+ $sql .= " ON DUPLICATE KEY UPDATE " . $fields_string . " = ?";
$values = array_values($param);
$param = array_merge_recursive($values, $values);
}
/**
- * @brief Fetch the id of the last insert command
+ * Fetch the id of the last insert command
*
* @return integer Last inserted id
*/
}
/**
- * @brief Locks a table for exclusive write access
+ * 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
+ * @param string|array $table Table name or array [schema => table]
*
* @return boolean was the lock successful?
* @throws \Exception
$this->connection->autocommit(false);
}
- $success = $this->e("LOCK TABLES " . $this->formatTableName($table) . " WRITE");
+ $success = $this->e("LOCK TABLES " . DBA::buildTableString($table) . " WRITE");
if ($this->driver == 'pdo') {
- $this->connection->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
+ $this->connection->setAttribute(PDO::ATTR_EMULATE_PREPARES, $this->pdo_emulate_prepares);
}
if (!$success) {
}
/**
- * @brief Unlocks all locked tables
+ * Unlocks all locked tables
*
* @return boolean was the unlock successful?
* @throws \Exception
$success = $this->e("UNLOCK TABLES");
if ($this->driver == 'pdo') {
- $this->connection->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
+ $this->connection->setAttribute(PDO::ATTR_EMULATE_PREPARES, $this->pdo_emulate_prepares);
$this->e("SET autocommit=1");
} else {
$this->connection->autocommit(true);
}
/**
- * @brief Starts a transaction
+ * Starts a transaction
*
* @return boolean Was the command executed successfully?
*/
}
/**
- * @brief Does a commit
+ * Does a commit
*
* @return boolean Was the command executed successfully?
*/
}
/**
- * @brief Does a rollback
+ * Does a rollback
*
* @return boolean Was the command executed successfully?
*/
}
/**
- * @brief Build the array with the table relations
+ * Build the array with the table relations
*
* The array is build from the database definitions in DBStructure.php
*
}
/**
- * @brief Delete a row from a table
+ * Delete a row from a table
+ *
+ * Note: this methods does NOT accept schema => table arrays because of the complex relation stuff.
*
* @param string $table Table name
* @param array $conditions Field condition(s)
// We quit when this key already exists in the callstack.
if (isset($callstack[$key])) {
- return $commands;
+ return true;
}
$callstack[$key] = true;
- $table = $this->sanitizeIdentifier($table);
-
$commands[$key] = ['table' => $table, 'conditions' => $conditions];
// Don't use "defaults" here, since it would set "false" to "true"
$condition_string = DBA::buildCondition($conditions);
if ((count($command['conditions']) > 1) || is_int($first_key)) {
- $sql = "DELETE FROM `" . $command['table'] . "`" . $condition_string;
- $this->logger->debug($this->replaceParameters($sql, $conditions));
+ $sql = "DELETE FROM " . DBA::quoteIdentifier($command['table']) . " " . $condition_string;
+ $this->logger->info($this->replaceParameters($sql, $conditions), ['callstack' => System::callstack(6), 'internal_callstack' => $callstack]);
if (!$this->e($sql, $conditions)) {
if ($do_transaction) {
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 (" .
+ $sql = "DELETE FROM " . DBA::quoteIdentifier($table) . " WHERE " . DBA::quoteIdentifier($field) . " IN (" .
substr(str_repeat("?, ", count($field_values)), 0, -2) . ");";
- $this->logger->debug($this->replaceParameters($sql, $field_values));
+ $this->logger->info($this->replaceParameters($sql, $field_values), ['callstack' => System::callstack(6), 'internal_callstack' => $callstack]);
if (!$this->e($sql, $field_values)) {
if ($do_transaction) {
}
/**
- * @brief Updates rows
+ * 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.
* 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 string|array $table Table name or array [schema => table]
* @param array $fields contains the fields that are updated
* @param array $condition condition array with the key values
* @param array|boolean $old_fields array with the old field values that are about to be replaced (true = update on duplicate)
*/
public function update($table, $fields, $condition, $old_fields = [])
{
-
if (empty($table) || empty($fields) || empty($condition)) {
$this->logger->info('Table, fields and condition have to be set');
return false;
}
- $condition_string = DBA::buildCondition($condition);
-
if (is_bool($old_fields)) {
$do_insert = $old_fields;
}
}
- $do_update = (count($old_fields) == 0);
-
foreach ($old_fields AS $fieldname => $content) {
- if (isset($fields[$fieldname])) {
- if (($fields[$fieldname] == $content) && !is_null($content)) {
- unset($fields[$fieldname]);
- } else {
- $do_update = true;
- }
+ if (isset($fields[$fieldname]) && !is_null($content) && ($fields[$fieldname] == $content)) {
+ unset($fields[$fieldname]);
}
}
- if (!$do_update || (count($fields) == 0)) {
+ if (count($fields) == 0) {
return true;
}
- $sql = "UPDATE " . $this->formatTableName($table) . " SET `" .
- implode("` = ?, `", array_keys($fields)) . "` = ?" . $condition_string;
+ $table_string = DBA::buildTableString($table);
- $params1 = array_values($fields);
- $params2 = array_values($condition);
- $params = array_merge_recursive($params1, $params2);
+ $condition_string = DBA::buildCondition($condition);
+
+ $sql = "UPDATE " . $table_string . " SET "
+ . implode(" = ?, ", array_map([DBA::class, 'quoteIdentifier'], array_keys($fields))) . " = ?"
+ . $condition_string;
+
+ // Combines the updated fields parameter values with the condition parameter values
+ $params = array_merge(array_values($fields), $condition);
return $this->e($sql, $params);
}
/**
* Retrieve a single record from a table and returns it in an associative array
*
- * @brief Retrieve a single record from a table
- *
- * @param string $table
- * @param array $fields
- * @param array $condition
- * @param array $params
+ * @param string|array $table
+ * @param array $fields
+ * @param array $condition
+ * @param array $params
*
* @return bool|array
* @throws \Exception
}
/**
- * @brief Select rows from a table and fills an array with the data
+ * Select rows from a table and fills an array with the data
*
- * @param string $table Table name
- * @param array $fields Array of selected fields, empty for all
- * @param array $condition Array of fields for condition
- * @param array $params Array of several parameters
+ * @param string|array $table Table name or array [schema => table]
+ * @param array $fields Array of selected fields, empty for all
+ * @param array $condition Array of fields for condition
+ * @param array $params Array of several parameters
*
* @return array Data array
* @throws \Exception
* @see self::select
*/
- public function selectToArray(string $table, array $fields = [], array $condition = [], array $params = [])
+ public function selectToArray($table, array $fields = [], array $condition = [], array $params = [])
{
return $this->toArray($this->select($table, $fields, $condition, $params));
}
/**
- * @brief Select rows from a table
+ * Select rows from a table
*
- * @param string $table Table name
- * @param array $fields Array of selected fields, empty for all
- * @param array $condition Array of fields for condition
- * @param array $params Array of several parameters
+ * @param string|array $table Table name or array [schema => table]
+ * @param array $fields Array of selected fields, empty for all
+ * @param array $condition Array of fields for condition
+ * @param array $params Array of several parameters
*
* @return boolean|object
*
}
if (count($fields) > 0) {
- $select_fields = "`" . implode("`, `", array_values($fields)) . "`";
+ $select_string = implode(', ', array_map([DBA::class, 'quoteIdentifier'], $fields));
} else {
- $select_fields = "*";
+ $select_string = '*';
}
+ $table_string = DBA::buildTableString($table);
+
$condition_string = DBA::buildCondition($condition);
$param_string = DBA::buildParameter($params);
- $sql = "SELECT " . $select_fields . " FROM " . $this->formatTableName($table) . $condition_string . $param_string;
+ $sql = "SELECT " . $select_string . " FROM " . $table_string . $condition_string . $param_string;
$result = $this->p($sql, $condition);
}
/**
- * @brief Counts the rows from a table satisfying the provided condition
+ * Counts the rows from a table satisfying the provided condition
*
- * @param string $table Table name
- * @param array $condition array of fields for condition
+ * @param string|array $table Table name or array [schema => table]
+ * @param array $condition Array of fields for condition
+ * @param array $params Array of several parameters
*
* @return int
*
* $count = DBA::count($table, $condition);
* @throws \Exception
*/
- public function count($table, array $condition = [])
+ public function count($table, array $condition = [], array $params = [])
{
if (empty($table)) {
return false;
}
+ $table_string = DBA::buildTableString($table);
+
$condition_string = DBA::buildCondition($condition);
- $sql = "SELECT COUNT(*) AS `count` FROM " . $this->formatTableName($table) . $condition_string;
+ if (empty($params['expression'])) {
+ $expression = '*';
+ } elseif (!empty($params['distinct'])) {
+ $expression = "DISTINCT " . DBA::quoteIdentifier($params['expression']);
+ } else {
+ $expression = DBA::quoteIdentifier($params['expression']);
+ }
+
+ $sql = "SELECT COUNT(" . $expression . ") AS `count` FROM " . $table_string . $condition_string;
$row = $this->fetchFirst($sql, $condition);
}
/**
- * @brief Fills an array with data from a query
+ * Fills an array with data from a query
*
* @param object $stmt statement object
* @param bool $do_close
}
/**
- * @brief Returns the error number of the last query
+ * Returns the error number of the last query
*
* @return string Error number (0 if no error)
*/
}
/**
- * @brief Returns the error message of the last query
+ * Returns the error message of the last query
*
* @return string Error message ('' if no error)
*/
}
/**
- * @brief Closes the current statement
+ * Closes the current statement
*
* @param object $stmt statement object
*
}
/**
- * @brief Return a list of database processes
+ * Return a list of database processes
*
* @return array
* 'list' => List of processes, separated in their different states
return (["list" => $statelist, "amount" => $processes]);
}
+ /**
+ * Fetch a database variable
+ *
+ * @param string $name
+ * @return string content
+ */
+ public function getVariable(string $name)
+ {
+ $result = $this->fetchFirst("SHOW GLOBAL VARIABLES WHERE `Variable_name` = ?", $name);
+ return $result['Value'] ?? null;
+ }
+
/**
* Checks if $array is a filled array with at least one entry.
*
}
/**
- * @brief Callback function for "esc_array"
+ * Callback function for "esc_array"
*
* @param mixed $value Array value
* @param string $key Array key
}
/**
- * @brief Escapes a whole array
+ * Escapes a whole array
*
* @param mixed $arr Array with values to be escaped
* @param boolean $add_quotation add quotation marks for string values
projects / friendica.git / blobdiff