mirror of
https://github.com/moodle/moodle.git
synced 2025-02-25 12:33:18 +01:00
934 lines
31 KiB
PHP
934 lines
31 KiB
PHP
<?php //$Id$
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require_once($CFG->libdir.'/dml/moodle_database.php');
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require_once($CFG->libdir.'/dml/mysqli_native_moodle_recordset.php');
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/**
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* Native mysqli class representing moodle database interface.
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* @package dml
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*/
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class mysqli_native_moodle_database extends moodle_database {
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protected $mysqli = null;
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protected $debug = false;
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/**
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* Detects if all needed PHP stuff installed.
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* Note: can be used before connect()
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* @return mixed true if ok, string if something
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*/
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public function driver_installed() {
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if (!extension_loaded('mysqli')) {
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return get_string('mysqliextensionisnotpresentinphp', 'install');
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}
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return true;
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}
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/**
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* Returns database family type - describes SQL dialect
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* Note: can be used before connect()
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* @return string db family name (mysql, postgres, mssql, oracle, etc.)
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*/
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public function get_dbfamily() {
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return 'mysql';
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}
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/**
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* Returns more specific database driver type
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* Note: can be used before connect()
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* @return string db type mysql, mysqli, postgres7
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*/
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protected function get_dbtype() {
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return 'mysqli';
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}
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/**
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* Returns general database library name
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* Note: can be used before connect()
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* @return string db type adodb, pdo, native
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*/
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protected function get_dblibrary() {
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return 'native';
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}
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/**
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* Returns localised database type name
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* Note: can be used before connect()
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* @return string
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*/
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public function get_name() {
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return get_string('nativemysqli', 'install');
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}
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/**
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* Returns localised database description
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* Note: can be used before connect()
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* @return string
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*/
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public function get_configuration_hints() {
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return get_string('databasesettingssub_mysqli', 'install');
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}
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/**
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* Connect to db
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* Must be called before other methods.
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* @param string $dbhost
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* @param string $dbuser
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* @param string $dbpass
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* @param string $dbname
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* @param bool $dbpersist
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* @param mixed $prefix string means moodle db prefix, false used for external databases where prefix not used
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* @param array $dboptions driver specific options
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* @return bool success
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*/
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public function connect($dbhost, $dbuser, $dbpass, $dbname, $dbpersist, $prefix, array $dboptions=null) {
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global $CFG;
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$this->store_settings($dbhost, $dbuser, $dbpass, $dbname, false, $prefix, $dboptions);
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$this->mysqli = new mysqli($dbhost, $dbuser, $dbpass, $dbname);
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if ($this->mysqli->connect_error) {
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return false;
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}
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$this->mysqli->set_charset('utf8');
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return true;
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}
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/**
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* Close database connection and release all resources
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* and memory (especially circular memory references).
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* Do NOT use connect() again, create a new instance if needed.
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*/
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public function dispose() {
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if ($this->mysqli) {
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$this->mysqli->close();
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$this->mysqli = null;
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}
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parent::dispose();
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}
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/**
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* Returns database server info array
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* @return array
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*/
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public function get_server_info() {
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return array('description'=>$this->mysqli->server_info, 'version'=>$this->mysqli->server_info);
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}
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/**
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* Returns supported query parameter types
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* @return bitmask
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*/
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protected function allowed_param_types() {
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return SQL_PARAMS_QM;
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}
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/**
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* Returns last error reported by database engine.
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*/
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public function get_last_error() {
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return $this->mysqli->error;
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}
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/**
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* Return tables in database WITHOUT current prefix
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* @return array of table names in lowercase and without prefix
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*/
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public function get_tables() {
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$this->reads++;
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$tables = array();
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if ($result = $this->mysqli->query("SHOW TABLES")) {
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while ($arr = $result->fetch_assoc()) {
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$tablename = reset($arr);
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if (strpos($tablename, $this->prefix) !== 0) {
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continue;
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}
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$tablename = substr($tablename, strlen($this->prefix));
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$tables[$tablename] = $tablename;
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}
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$result->close();
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}
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return $tables;
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}
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/**
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* Return table indexes - everything lowercased
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* @return array of arrays
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*/
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public function get_indexes($table) {
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$preflen = strlen($this->prefix);
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$indexes = array();
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if ($result = $this->mysqli->query("SHOW INDEXES FROM {$this->prefix}$table")) {
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while ($res = $result->fetch_object()) {
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if ($res->Key_name === 'PRIMARY') {
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continue;
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}
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if (!isset($indexes[$res->Key_name])) {
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$indexes[$res->Key_name] = array('unique'=>empty($res->Non_unique), 'columns'=>array());
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}
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$indexes[$res->Key_name]['columns'][$res->Seq_in_index-1] = $res->Column_name;
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}
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$result->close();
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}
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return $indexes;
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}
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/**
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* Returns datailed information about columns in table. This information is cached internally.
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* @param string $table name
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* @param bool $usecache
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* @return array array of database_column_info objects indexed with column names
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*/
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public function get_columns($table, $usecache=true) {
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if ($usecache and isset($this->columns[$table])) {
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return $this->columns[$table];
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}
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$this->columns[$table] = array();
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if (!$rawcolumns = $this->get_records_sql("SHOW COLUMNS FROM {".$table."}")) {
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return array();
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}
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foreach ($rawcolumns as $rawcolumn) {
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$info = new object();
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$info->name = $rawcolumn->field;
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$matches = null;
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if (preg_match('/varchar\((\d+)\)/i', $rawcolumn->type, $matches)) {
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$info->type = 'varchar';
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$info->meta_type = 'C';
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$info->max_length = $matches[1];
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$info->scale = null;
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$info->not_null = ($rawcolumn->null === 'NO');
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$info->default_value = $rawcolumn->default;
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$info->has_default = is_null($info->default_value) ? false : true;
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$info->primary_key = ($rawcolumn->key === 'PRI');
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$info->binary = false;
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$info->unsigned = null;
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$info->auto_increment= false;
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$info->unique = null;
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} else if (preg_match('/([a-z]*int[a-z]*)\((\d+)\)/i', $rawcolumn->type, $matches)) {
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$info->type = $matches[1];
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$info->primary_key = ($rawcolumn->key === 'PRI');
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if ($info->primary_key) {
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$info->meta_type = 'R';
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$info->max_length = $matches[2];
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$info->scale = null;
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$info->not_null = ($rawcolumn->null === 'NO');
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$info->default_value = $rawcolumn->default;
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$info->has_default = is_null($info->default_value) ? false : true;
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$info->binary = false;
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$info->unsigned = (stripos($rawcolumn->type, 'unsigned') !== false);
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$info->auto_increment= true;
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$info->unique = true;
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} else {
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$info->meta_type = 'I';
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$info->max_length = $matches[2];
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$info->scale = null;
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$info->not_null = ($rawcolumn->null === 'NO');
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$info->default_value = $rawcolumn->default;
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$info->has_default = is_null($info->default_value) ? false : true;
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$info->binary = false;
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$info->unsigned = (stripos($rawcolumn->type, 'unsigned') !== false);
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$info->auto_increment= false;
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$info->unique = null;
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}
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} else if (preg_match('/(decimal|double|float)\((\d+),(\d+)\)/i', $rawcolumn->type, $matches)) {
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$info->type = $matches[1];
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$info->meta_type = 'N';
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$info->max_length = $matches[2];
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$info->scale = $matches[3];
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$info->not_null = ($rawcolumn->null === 'NO');
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$info->default_value = $rawcolumn->default;
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$info->has_default = is_null($info->default_value) ? false : true;
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$info->primary_key = ($rawcolumn->key === 'PRI');
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$info->binary = false;
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$info->unsigned = null;
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$info->auto_increment= false;
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$info->unique = null;
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} else if (preg_match('/([a-z]*text)/i', $rawcolumn->type, $matches)) {
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$info->type = $matches[1];
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$info->meta_type = 'X';
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$info->max_length = -1;
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$info->scale = null;
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$info->not_null = ($rawcolumn->null === 'NO');
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$info->default_value = $rawcolumn->default;
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$info->has_default = is_null($info->default_value) ? false : true;
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$info->primary_key = ($rawcolumn->key === 'PRI');
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$info->binary = false;
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$info->unsigned = null;
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$info->auto_increment= false;
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$info->unique = null;
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} else if (preg_match('/([a-z]*blob)/i', $rawcolumn->type, $matches)) {
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$info->type = $matches[1];
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$info->meta_type = 'B';
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$info->max_length = -1;
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$info->scale = null;
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$info->not_null = ($rawcolumn->null === 'NO');
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$info->default_value = $rawcolumn->default;
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$info->has_default = is_null($info->default_value) ? false : true;
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$info->primary_key = false;
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$info->binary = true;
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$info->unsigned = null;
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$info->auto_increment= false;
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$info->unique = null;
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} else if (preg_match('/enum\((.*)\)/i', $rawcolumn->type, $matches)) {
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$info->type = 'enum';
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$info->meta_type = 'C';
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$info->enums = array();
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$info->max_length = 0;
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$values = $matches[1];
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$values = explode(',', $values);
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$textlib = textlib_get_instance();
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foreach ($values as $val) {
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$val = trim($val, "'");
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$length = $textlib->strlen($val);
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$info->enums[] = $val;
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$info->max_length = ($info->max_length < $length) ? $length : $info->max_length;
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}
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$info->scale = null;
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$info->not_null = ($rawcolumn->null === 'NO');
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$info->default_value = $rawcolumn->default;
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$info->has_default = is_null($info->default_value) ? false : true;
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$info->primary_key = ($rawcolumn->key === 'PRI');
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$info->binary = false;
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$info->unsigned = null;
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$info->auto_increment= false;
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$info->unique = null;
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}
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$this->columns[$table][$info->name] = new database_column_info($info);
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}
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return $this->columns[$table];
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}
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/**
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* Reset a sequence to the id field of a table.
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* @param string $table name of table
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* @return success
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*/
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public function reset_sequence($table) {
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// From http://dev.mysql.com/doc/refman/5.0/en/alter-table.html
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if (!$this->get_manager()->table_exists($table)) {
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return false;
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}
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$value = (int)$this->get_field_sql('SELECT MAX(id) FROM {'.$table.'}');
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$value++;
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return $this->change_database_structure("ALTER TABLE $this->prefix$table AUTO_INCREMENT = $value");
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}
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/**
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* Is db in unicode mode?
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* @return bool
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*/
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public function setup_is_unicodedb() {
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$this->reads++;
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if ($result = $this->mysqli->query("SHOW LOCAL VARIABLES LIKE 'character_set_database'")) {
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$result->close();
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return true;
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}
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return false;
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}
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/**
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* Enable/disable very detailed debugging
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* @param bool $state
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*/
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public function set_debug($state) {
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$this->debug = $state;
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}
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/**
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* Returns debug status
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* @return bool $state
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*/
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public function get_debug() {
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return $this->debug;
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}
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/**
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* Enable/disable detailed sql logging
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* @param bool $state
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*/
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public function set_logging($state) {
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//TODO
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}
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/**
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* Do NOT use in code, to be used by database_manager only!
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* @param string $sql query
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* @return bool success
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*/
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public function change_database_structure($sql) {
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$this->writes++;
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$this->print_debug($sql);
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$result = $this->mysqli->query($sql);
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$this->reset_columns();
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if ($result === false) {
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$this->report_error($sql);
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return false;
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}
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return true;
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}
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/**
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* Very ugly hack which emulates bound parameters in queries
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* because prepared statements do not use query cache.
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*/
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protected function emulate_bound_params($sql, array $params=null) {
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if (empty($params)) {
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return $sql;
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}
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/// ok, we have verified sql statement with ? and correct number of params
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$return = strtok($sql, '?');
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foreach ($params as $param) {
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if (is_bool($param)) {
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$return .= (int)$param;
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} else if (is_null($param)) {
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$return .= 'NULL';
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} else if (is_numeric($param)) {
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$return .= $param;
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} else {
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$param = $this->mysqli->real_escape_string($param);
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$return .= "'$param'";
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}
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$return .= strtok('?');
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}
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return $return;
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}
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/**
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* Execute general sql query. Should be used only when no other method suitable.
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* Do NOT use this to make changes in db structure, use database_manager::execute_sql() instead!
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* @param string $sql query
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* @param array $params query parameters
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* @return bool success
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*/
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public function execute($sql, array $params=null) {
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list($sql, $params, $type) = $this->fix_sql_params($sql, $params);
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if (strpos($sql, ';') !== false) {
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debugging('Error: Multiple sql statements found or bound parameters not used properly in query!');
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return false;
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}
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$rawsql = $this->emulate_bound_params($sql, $params);
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$this->writes++;
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$this->print_debug($sql, $params);
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$result = $this->mysqli->query($rawsql);
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if ($result === false) {
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$this->report_error($sql, $params);
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return false;
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} else if ($result === true) {
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return true;
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} else {
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$result->close();
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return true;
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}
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}
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/**
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* Get a number of records as a moodle_recordset using a SQL statement.
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*
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* Since this method is a little less readable, use of it should be restricted to
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* code where it's possible there might be large datasets being returned. For known
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* small datasets use get_records_sql - it leads to simpler code.
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*
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* The return type is as for @see function get_recordset.
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*
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* @param string $sql the SQL select query to execute.
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* @param array $params array of sql parameters
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* @param int $limitfrom return a subset of records, starting at this point (optional, required if $limitnum is set).
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* @param int $limitnum return a subset comprising this many records (optional, required if $limitfrom is set).
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* @return mixed an moodle_recorset object, or false if an error occured.
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*/
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public function get_recordset_sql($sql, array $params=null, $limitfrom=0, $limitnum=0) {
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if ($limitfrom or $limitnum) {
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$limitfrom = (int)$limitfrom;
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$limitnum = (int)$limitnum;
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if ($limitnum < 1) {
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$limitnum = "18446744073709551615";
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}
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$sql .= " LIMIT $limitfrom, $limitnum";
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}
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list($sql, $params, $type) = $this->fix_sql_params($sql, $params);
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$rawsql = $this->emulate_bound_params($sql, $params);
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$this->reads++;
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$this->print_debug($sql, $params);
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// no MYSQLI_USE_RESULT here, it would block write ops on affected tables
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$result = $this->mysqli->query($rawsql, MYSQLI_STORE_RESULT);
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if ($result === false) {
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$this->report_error($sql, $params);
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return false;
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}
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return $this->create_recordset($result);
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}
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protected function create_recordset($result) {
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return new mysqli_native_moodle_recordset($result);
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}
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/**
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* Get a number of records as an array of objects using a SQL statement.
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*
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* Return value as for @see function get_records.
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*
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* @param string $sql the SQL select query to execute. The first column of this SELECT statement
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* must be a unique value (usually the 'id' field), as it will be used as the key of the
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* returned array.
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* @param array $params array of sql parameters
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* @param int $limitfrom return a subset of records, starting at this point (optional, required if $limitnum is set).
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* @param int $limitnum return a subset comprising this many records (optional, required if $limitfrom is set).
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* @return mixed an array of objects, or empty array if no records were found, or false if an error occured.
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*/
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public function get_records_sql($sql, array $params=null, $limitfrom=0, $limitnum=0) {
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if ($limitfrom or $limitnum) {
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$limitfrom = (int)$limitfrom;
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$limitnum = (int)$limitnum;
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if ($limitnum < 1) {
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$limitnum = "18446744073709551615";
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}
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$sql .= " LIMIT $limitfrom, $limitnum";
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}
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|
|
list($sql, $params, $type) = $this->fix_sql_params($sql, $params);
|
|
$rawsql = $this->emulate_bound_params($sql, $params);
|
|
|
|
$this->reads++;
|
|
$this->print_debug($sql, $params);
|
|
$result = $this->mysqli->query($rawsql, MYSQLI_STORE_RESULT);
|
|
|
|
if ($result === false) {
|
|
$this->report_error($sql, $params);
|
|
return false;
|
|
}
|
|
|
|
$return = array();
|
|
|
|
while($row = $result->fetch_assoc()) {
|
|
$row = array_change_key_case($row, CASE_LOWER);
|
|
$id = reset($row);
|
|
$return[$id] = (object)$row;
|
|
}
|
|
$result->close();
|
|
|
|
return $return;
|
|
}
|
|
|
|
/**
|
|
* Selects records and return values (first field) as an array using a SQL statement.
|
|
*
|
|
* @param string $sql The SQL query
|
|
* @param array $params array of sql parameters
|
|
* @return mixed array of values or false if an error occured
|
|
*/
|
|
public function get_fieldset_sql($sql, array $params=null) {
|
|
list($sql, $params, $type) = $this->fix_sql_params($sql, $params);
|
|
$rawsql = $this->emulate_bound_params($sql, $params);
|
|
|
|
$this->reads++;
|
|
$this->print_debug($sql, $params);
|
|
$result = $this->mysqli->query($rawsql, MYSQLI_STORE_RESULT);
|
|
|
|
if ($result === false) {
|
|
$this->report_error($sql, $params);
|
|
return false;
|
|
}
|
|
|
|
$return = array();
|
|
|
|
while($row = $result->fetch_assoc()) {
|
|
$return[] = reset($row);
|
|
}
|
|
$result->close();
|
|
|
|
return $return;
|
|
}
|
|
|
|
/**
|
|
* Insert new record into database, as fast as possible, no safety checks, lobs not supported.
|
|
* @param string $table name
|
|
* @param mixed $params data record as object or array
|
|
* @param bool $returnit return it of inserted record
|
|
* @param bool $bulk true means repeated inserts expected
|
|
* @param bool $customsequence true if 'id' included in $params, disables $returnid
|
|
* @return mixed success or new id
|
|
*/
|
|
public function insert_record_raw($table, $params, $returnid=true, $bulk=false, $customsequence=false) {
|
|
if (!is_array($params)) {
|
|
$params = (array)$params;
|
|
}
|
|
|
|
if ($customsequence) {
|
|
if (!isset($params['id'])) {
|
|
return false;
|
|
}
|
|
$returnid = false;
|
|
} else {
|
|
unset($params['id']);
|
|
}
|
|
|
|
if (empty($params)) {
|
|
return false;
|
|
}
|
|
|
|
$fields = implode(',', array_keys($params));
|
|
$qms = array_fill(0, count($params), '?');
|
|
$qms = implode(',', $qms);
|
|
|
|
$sql = "INSERT INTO {$this->prefix}$table ($fields) VALUES($qms)";
|
|
$rawsql = $this->emulate_bound_params($sql, $params);
|
|
|
|
$this->writes++;
|
|
$this->print_debug($sql, $params);
|
|
$result = $this->mysqli->query($rawsql);
|
|
|
|
if ($result === false) {
|
|
$this->report_error($sql, $params);
|
|
return false;
|
|
}
|
|
|
|
if (!$id = $this->mysqli->insert_id) {
|
|
return false;
|
|
}
|
|
|
|
if (!$returnid) {
|
|
return true;
|
|
} else {
|
|
return (int)$id;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Insert a record into a table and return the "id" field if required.
|
|
*
|
|
* Some conversions and safety checks are carried out. Lobs are supported.
|
|
* If the return ID isn't required, then this just reports success as true/false.
|
|
* $data is an object containing needed data
|
|
* @param string $table The database table to be inserted into
|
|
* @param object $data A data object with values for one or more fields in the record
|
|
* @param bool $returnid Should the id of the newly created record entry be returned? If this option is not requested then true/false is returned.
|
|
* @return mixed success or new ID
|
|
*/
|
|
public function insert_record($table, $dataobject, $returnid=true, $bulk=false) {
|
|
if (!is_object($dataobject)) {
|
|
$dataobject = (object)$dataobject;
|
|
}
|
|
|
|
$columns = $this->get_columns($table);
|
|
|
|
unset($dataobject->id);
|
|
$cleaned = array();
|
|
|
|
foreach ($dataobject as $field=>$value) {
|
|
if (!isset($columns[$field])) {
|
|
continue;
|
|
}
|
|
$column = $columns[$field];
|
|
if (is_bool($value)) {
|
|
$value = (int)$value; // prevent "false" problems
|
|
}
|
|
if (!empty($column->enums)) {
|
|
// workaround for problem with wrong enums in mysql
|
|
if (is_null($value) and !$column->not_null) {
|
|
// ok - nulls allowed
|
|
} else {
|
|
if (!in_array((string)$value, $column->enums)) {
|
|
debugging('Enum value '.s($value).' not allowed in field '.$field.' table '.$table.'.');
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
$cleaned[$field] = $value;
|
|
}
|
|
|
|
if (empty($cleaned)) {
|
|
return false;
|
|
}
|
|
|
|
return $this->insert_record_raw($table, $cleaned, $returnid, $bulk);
|
|
}
|
|
|
|
/**
|
|
* Import a record into a table, id field is required.
|
|
* Safety checks are NOT carried out. Lobs are supported.
|
|
*
|
|
* @param string $table name of database table to be inserted into
|
|
* @param object $dataobject A data object with values for one or more fields in the record
|
|
* @return bool success
|
|
*/
|
|
public function import_record($table, $dataobject) {
|
|
$dataobject = (object)$dataobject;
|
|
|
|
if (empty($dataobject->id)) {
|
|
return false;
|
|
}
|
|
|
|
$columns = $this->get_columns($table);
|
|
$cleaned = array();
|
|
|
|
foreach ($dataobject as $field=>$value) {
|
|
if (!isset($columns[$field])) {
|
|
continue;
|
|
}
|
|
$cleaned[$field] = $value;
|
|
}
|
|
|
|
return $this->insert_record_raw($table, $cleaned, false, true, true);
|
|
}
|
|
|
|
/**
|
|
* Update record in database, as fast as possible, no safety checks, lobs not supported.
|
|
* @param string $table name
|
|
* @param mixed $params data record as object or array
|
|
* @param bool true means repeated updates expected
|
|
* @return bool success
|
|
*/
|
|
public function update_record_raw($table, $params, $bulk=false) {
|
|
if (!is_array($params)) {
|
|
$params = (array)$params;
|
|
}
|
|
if (!isset($params['id'])) {
|
|
return false;
|
|
}
|
|
$id = $params['id'];
|
|
unset($params['id']);
|
|
|
|
if (empty($params)) {
|
|
return false;
|
|
}
|
|
|
|
$sets = array();
|
|
foreach ($params as $field=>$value) {
|
|
$sets[] = "$field = ?";
|
|
}
|
|
|
|
$params[] = $id; // last ? in WHERE condition
|
|
|
|
$sets = implode(',', $sets);
|
|
$sql = "UPDATE {$this->prefix}$table SET $sets WHERE id=?";
|
|
$rawsql = $this->emulate_bound_params($sql, $params);
|
|
|
|
$this->writes++;
|
|
$this->print_debug($sql, $params);
|
|
$result = $this->mysqli->query($rawsql);
|
|
|
|
if ($result === false) {
|
|
$this->report_error($sql, $params);
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Update a record in a table
|
|
*
|
|
* $dataobject is an object containing needed data
|
|
* Relies on $dataobject having a variable "id" to
|
|
* specify the record to update
|
|
*
|
|
* @param string $table The database table to be checked against.
|
|
* @param object $dataobject An object with contents equal to fieldname=>fieldvalue. Must have an entry for 'id' to map to the table specified.
|
|
* @param bool true means repeated updates expected
|
|
* @return bool success
|
|
*/
|
|
public function update_record($table, $dataobject, $bulk=false) {
|
|
if (!is_object($dataobject)) {
|
|
$dataobject = (object)$dataobject;
|
|
}
|
|
|
|
if (!isset($dataobject->id) ) {
|
|
return false;
|
|
}
|
|
|
|
$columns = $this->get_columns($table);
|
|
$cleaned = array();
|
|
|
|
foreach ($dataobject as $field=>$value) {
|
|
if (!isset($columns[$field])) {
|
|
continue;
|
|
}
|
|
if (is_bool($value)) {
|
|
$value = (int)$value; // prevent "false" problems
|
|
}
|
|
$cleaned[$field] = $value;
|
|
}
|
|
|
|
return $this->update_record_raw($table, $cleaned, $bulk);
|
|
}
|
|
|
|
/**
|
|
* Set a single field in every table record which match a particular WHERE clause.
|
|
*
|
|
* @param string $table The database table to be checked against.
|
|
* @param string $newfield the field to set.
|
|
* @param string $newvalue the value to set the field to.
|
|
* @param string $select A fragment of SQL to be used in a where clause in the SQL call.
|
|
* @param array $params array of sql parameters
|
|
* @return bool success
|
|
*/
|
|
public function set_field_select($table, $newfield, $newvalue, $select, array $params=null) {
|
|
if ($select) {
|
|
$select = "WHERE $select";
|
|
}
|
|
if (is_null($params)) {
|
|
$params = array();
|
|
}
|
|
list($select, $params, $type) = $this->fix_sql_params($select, $params);
|
|
|
|
if (is_bool($newvalue)) {
|
|
$newvalue = (int)$newvalue; // prevent "false" problems
|
|
}
|
|
if (is_null($newvalue)) {
|
|
$newfield = "$newfield = NULL";
|
|
} else {
|
|
$newfield = "$newfield = ?";
|
|
array_unshift($params, $newvalue);
|
|
}
|
|
$sql = "UPDATE {$this->prefix}$table SET $newfield $select";
|
|
$rawsql = $this->emulate_bound_params($sql, $params);
|
|
|
|
$this->writes++;
|
|
$this->print_debug($sql, $params);
|
|
$result = $this->mysqli->query($rawsql);
|
|
|
|
if ($result === false) {
|
|
$this->report_error($sql, $params);
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Delete one or more records from a table which match a particular WHERE clause.
|
|
*
|
|
* @param string $table The database table to be checked against.
|
|
* @param string $select A fragment of SQL to be used in a where clause in the SQL call (used to define the selection criteria).
|
|
* @param array $params array of sql parameters
|
|
* @return returns success.
|
|
*/
|
|
public function delete_records_select($table, $select, array $params=null) {
|
|
if ($select) {
|
|
$select = "WHERE $select";
|
|
}
|
|
$sql = "DELETE FROM {$this->prefix}$table $select";
|
|
|
|
list($sql, $params, $type) = $this->fix_sql_params($sql, $params);
|
|
$rawsql = $this->emulate_bound_params($sql, $params);
|
|
|
|
$this->writes++;
|
|
$this->print_debug($sql, $params);
|
|
$result = $this->mysqli->query($rawsql);
|
|
|
|
if ($result === false) {
|
|
$this->report_error($sql, $params);
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
public function sql_cast_char2int($fieldname, $text=false) {
|
|
return ' CAST(' . $fieldname . ' AS SIGNED) ';
|
|
}
|
|
|
|
public function sql_concat() {
|
|
$arr = func_get_args();
|
|
$s = implode(',', $arr);
|
|
if ($s === '') {
|
|
return "''";
|
|
}
|
|
return "CONCAT($s)";
|
|
}
|
|
|
|
public function sql_concat_join($separator="' '", $elements=array()) {
|
|
for ($n=count($elements)-1; $n > 0 ; $n--) {
|
|
array_splice($elements, $n, 0, $separator);
|
|
}
|
|
$s = implode(',', $elements);
|
|
if ($s === '') {
|
|
return "''";
|
|
}
|
|
return "CONCAT ($s)";
|
|
}
|
|
|
|
public function sql_substr() {
|
|
return "SUBSTRING";
|
|
}
|
|
|
|
|
|
/**
|
|
* Does this driver suppoer regex syntax when searching
|
|
*/
|
|
public function sql_regex_supported() {
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Return regex positive or negative match sql
|
|
* @param bool $positivematch
|
|
* @return string or empty if not supported
|
|
*/
|
|
public function sql_regex($positivematch=true) {
|
|
return $positivematch ? 'REGEXP' : 'NOT REGEXP';
|
|
}
|
|
|
|
/// transactions
|
|
/**
|
|
* on DBs that support it, switch to transaction mode and begin a transaction
|
|
* you'll need to ensure you call commit_sql() or your changes *will* be lost.
|
|
*
|
|
* this is _very_ useful for massive updates
|
|
*/
|
|
public function begin_sql() {
|
|
$result = $result = $this->mysqli->query("SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED");
|
|
if ($result === false) {
|
|
return false;
|
|
}
|
|
$result = $result = $this->mysqli->query("BEGIN");
|
|
if ($result === false) {
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* on DBs that support it, commit the transaction
|
|
*/
|
|
public function commit_sql() {
|
|
$result = $result = $this->mysqli->query("COMMIT");
|
|
if ($result === false) {
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* on DBs that support it, rollback the transaction
|
|
*/
|
|
public function rollback_sql() {
|
|
$result = $result = $this->mysqli->query("ROLLBACK");
|
|
if ($result === false) {
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
}
|