--- /dev/null
+<?php //$Id$
+
+require_once($CFG->libdir.'/dml/moodle_database.php');
+require_once($CFG->libdir.'/dml/mysqli_native_moodle_recordset.php');
+
+/**
+ * Native mysqli class representing moodle database interface.
+ * @package dml
+ */
+class mysqli_native_moodle_database extends moodle_database {
+
+ protected $mysqli=null;
+
+ /**
+ * Detects if all needed PHP stuff installed.
+ * Note: can be used before connect()
+ * @return mixed true if ok, string if something
+ */
+ public function driver_installed() {
+ if (!extension_loaded('mysqli')) {
+ return get_string('mysqliextensionisnotpresentinphp', 'install');
+ }
+ return true;
+ }
+
+ /**
+ * Returns database family type - describes SQL dialect
+ * Note: can be used before connect()
+ * @return string db family name (mysql, postgres, mssql, oracle, etc.)
+ */
+ public function get_dbfamily() {
+ return 'mysql';
+ }
+
+ /**
+ * Returns more specific database driver type
+ * Note: can be used before connect()
+ * @return string db type mysql, mysqli, postgres7
+ */
+ protected function get_dbtype() {
+ return 'mysqli';
+ }
+
+ /**
+ * Returns general database library name
+ * Note: can be used before connect()
+ * @return string db type adodb, pdo, native
+ */
+ protected function get_dblibrary() {
+ return 'native';
+ }
+
+ /**
+ * Returns localised database type name
+ * Note: can be used before connect()
+ * @return string
+ */
+ public function get_name() {
+ return get_string('nativemysqli', 'install'); //TODO: localise
+ }
+
+ /**
+ * Returns localised database description
+ * Note: can be used before connect()
+ * @return string
+ */
+ public function get_configuration_hints() {
+ return get_string('databasesettingssub_mysqlinative', 'install'); //TODO: localise
+ }
+
+ /**
+ * Connect to db
+ * Must be called before other methods.
+ * @param string $dbhost
+ * @param string $dbuser
+ * @param string $dbpass
+ * @param string $dbname
+ * @param bool $dbpersist
+ * @param mixed $prefix string means moodle db prefix, false used for external databases where prefix not used
+ * @param array $dboptions driver specific options
+ * @return bool success
+ */
+ public function connect($dbhost, $dbuser, $dbpass, $dbname, $dbpersist, $prefix, array $dboptions=null) {
+ global $CFG;
+
+ $this->store_settings($dbhost, $dbuser, $dbpass, $dbname, false, $prefix, $dboptions);
+
+ $this->mysqli = new mysqli($dbhost, $dbuser, $dbpass, $dbname);
+ if ($this->mysqli->connect_error) {
+ return false;
+ }
+ $this->mysqli->set_charset('utf8');
+ return true;
+ }
+
+ /**
+ * Close database connection and release all resources
+ * and memory (especially circular memory references).
+ * Do NOT use connect() again, create a new instance if needed.
+ */
+ public function dispose() {
+ if ($this->mysqli) {
+ $this->mysqli->close();
+ $this->mysqli = null;
+ }
+ parent::dispose();
+ }
+
+ /**
+ * Returns database server info array
+ * @return array
+ */
+ public function get_server_info() {
+ return array('description'=>$this->mysqli->server_info, 'version'=>$this->mysqli->server_info);
+ }
+
+ /**
+ * Returns supported query parameter types
+ * @return bitmask
+ */
+ protected function allowed_param_types() {
+ return SQL_PARAMS_QM;
+ }
+
+ /**
+ * Returns last error reported by database engine.
+ */
+ public function get_last_error() {
+ return $this->mysqli->error;
+ }
+
+ /**
+ * Return tables in database WITHOUT current prefix
+ * @return array of table names in lowercase and without prefix
+ */
+ public function get_tables() {
+ $this->reads++;
+ $tables = array();
+ if ($result = $this->mysqli->query("SHOW TABLES")) {
+ while ($arr = $result->fetch_assoc()) {
+ $tablename = reset($arr);
+ if (strpos($tablename, $this->prefix) !== 0) {
+ continue;
+ }
+ $tablename = substr($tablename, strlen($this->prefix));
+ $tables[$tablename] = $tablename;
+ }
+ $result->close();
+ }
+ return $tables;
+ }
+
+ /**
+ * Return table indexes - everything lowercased
+ * @return array of arrays
+ */
+ public function get_indexes($table) {
+ $preflen = strlen($this->prefix);
+ $indexes = array();
+ if ($result = $this->mysqli->query("SHOW INDEXES FROM {$this->prefix}$table")) {
+ while ($res = $result->fetch_object()) {
+ if ($res->Key_name === 'PRIMARY') {
+ continue;
+ }
+ if (!isset($indexes[$res->Key_name])) {
+ $indexes[$res->Key_name] = array('unique'=>empty($res->Non_unique), 'columns'=>array());
+ }
+ $indexes[$res->Key_name]['columns'][$res->Seq_in_index-1] = $res->Column_name;
+ }
+ $result->close();
+ }
+ return $indexes;
+ }
+
+ /**
+ * Returns datailed information about columns in table. This information is cached internally.
+ * @param string $table name
+ * @param bool $usecache
+ * @return array array of database_column_info objects indexed with column names
+ */
+ public function get_columns($table, $usecache=true) {
+ if ($usecache and isset($this->columns[$table])) {
+ return $this->columns[$table];
+ }
+
+ $this->columns[$table] = array();
+
+ if (!$rawcolumns = $this->get_records_sql("SHOW COLUMNS FROM {".$table."}")) {
+ return array();
+ }
+
+ foreach ($rawcolumns as $rawcolumn) {
+ $info = new object();
+ $info->name = $rawcolumn->field;
+ $matches = null;
+
+ if (preg_match('/varchar\((\d+)\)/i', $rawcolumn->type, $matches)) {
+ $info->type = 'varchar';
+ $info->meta_type = 'C';
+ $info->max_length = $matches[1];
+ $info->scale = null;
+ $info->not_null = ($rawcolumn->null === 'NO');
+ $info->default_value = $rawcolumn->default;
+ $info->has_default = is_null($info->default_value) ? false : true;
+ $info->primary_key = ($rawcolumn->key === 'PRI');
+ $info->binary = false;
+ $info->unsigned = null;
+ $info->auto_increment= false;
+ $info->unique = null;
+
+ } else if (preg_match('/([a-z]*int[a-z]*)\((\d+)\)/i', $rawcolumn->type, $matches)) {
+ $info->type = $matches[1];
+ $info->primary_key = ($rawcolumn->key === 'PRI');
+ if ($info->primary_key) {
+ $info->meta_type = 'R';
+ $info->max_length = $matches[2];
+ $info->scale = null;
+ $info->not_null = ($rawcolumn->null === 'NO');
+ $info->default_value = $rawcolumn->default;
+ $info->has_default = is_null($info->default_value) ? false : true;
+ $info->binary = false;
+ $info->unsigned = (stripos($rawcolumn->type, 'unsigned') !== false);
+ $info->auto_increment= true;
+ $info->unique = true;
+ } else {
+ $info->meta_type = 'I';
+ $info->max_length = $matches[2];
+ $info->scale = null;
+ $info->not_null = ($rawcolumn->null === 'NO');
+ $info->default_value = $rawcolumn->default;
+ $info->has_default = is_null($info->default_value) ? false : true;
+ $info->binary = false;
+ $info->unsigned = (stripos($rawcolumn->type, 'unsigned') !== false);
+ $info->auto_increment= false;
+ $info->unique = null;
+ }
+
+ } else if (preg_match('/decimal\((\d+),(\d+)\)/i', $rawcolumn->type, $matches)) {
+ $info->type = 'decimal';
+ $info->meta_type = 'N';
+ $info->max_length = $matches[1];
+ $info->scale = $matches[2];
+ $info->not_null = ($rawcolumn->null === 'NO');
+ $info->default_value = $rawcolumn->default;
+ $info->has_default = is_null($info->default_value) ? false : true;
+ $info->primary_key = ($rawcolumn->key === 'PRI');
+ $info->binary = false;
+ $info->unsigned = null;
+ $info->auto_increment= false;
+ $info->unique = null;
+
+ } else if (preg_match('/([a-z]*text)/i', $rawcolumn->type, $matches)) {
+ $info->type = $matches[1];
+ $info->meta_type = 'X';
+ $info->max_length = -1;
+ $info->scale = null;
+ $info->not_null = ($rawcolumn->null === 'NO');
+ $info->default_value = $rawcolumn->default;
+ $info->has_default = is_null($info->default_value) ? false : true;
+ $info->primary_key = ($rawcolumn->key === 'PRI');
+ $info->binary = false;
+ $info->unsigned = null;
+ $info->auto_increment= false;
+ $info->unique = null;
+
+ } else if (preg_match('/enum\((.*)\)/i', $rawcolumn->type, $matches)) {
+ $info->type = 'enum';
+ $info->meta_type = 'C';
+ $info->enums = array();
+ $info->max_length = 0;
+ $values = $matches[1];
+ $values = explode(',', $values);
+ $textlib = textlib_get_instance();
+ foreach ($values as $val) {
+ $val = trim($val, "'");
+ $length = $textlib->strlen($val);
+ $info->enums[] = $val;
+ $info->max_length = ($info->max_length < $length) ? $length : $info->max_length;
+ }
+ $info->scale = null;
+ $info->not_null = ($rawcolumn->null === 'NO');
+ $info->default_value = $rawcolumn->default;
+ $info->has_default = is_null($info->default_value) ? false : true;
+ $info->primary_key = ($rawcolumn->key === 'PRI');
+ $info->binary = false;
+ $info->unsigned = null;
+ $info->auto_increment= false;
+ $info->unique = null;
+ }
+
+ $this->columns[$table][$info->name] = new database_column_info($info);
+ }
+
+ return $this->columns[$table];
+ }
+
+ /**
+ * Reset a sequence to the id field of a table.
+ * @param string $table name of table
+ * @return success
+ */
+ public function reset_sequence($table) {
+ // From http://dev.mysql.com/doc/refman/5.0/en/alter-table.html
+ if (!$this->get_manager()->table_exists($table)) {
+ return false;
+ }
+ $value = (int)$this->get_field_sql('SELECT MAX(id) FROM {'.$table.'}');
+ $value++;
+ return $this->change_database_structure("ALTER TABLE $this->prefix$table AUTO_INCREMENT = $value");
+ }
+
+ /**
+ * Is db in unicode mode?
+ * @return bool
+ */
+ public function setup_is_unicodedb() {
+ $this->reads++;
+ if ($result = $this->mysqli->query("SHOW LOCAL VARIABLES LIKE 'character_set_database'")) {
+ $result->close();
+ return true;
+ }
+ return false;
+ }
+
+ /**
+ * Enable/disable very detailed debugging
+ * TODO: do we need levels?
+ * @param bool $state
+ */
+ public function set_debug($state) {
+ //TODO
+ }
+
+ /**
+ * Returns debug status
+ * @return bool $state
+ */
+ public function get_debug() {
+ //TODO
+ }
+
+ /**
+ * Enable/disable detailed sql logging
+ * TODO: do we need levels?
+ * @param bool $state
+ */
+ public function set_logging($state) {
+ //TODO
+ }
+
+ /**
+ * Do NOT use in code, to be used by database_manager only!
+ * @param string $sql query
+ * @return bool success
+ */
+ public function change_database_structure($sql) {
+ return ($this->mysqli->query($sql) === TRUE);
+ }
+
+ /**
+ * Very ugly hack which emulates bound parameters in queries
+ * because prepared statements do not use query cache.
+ */
+ protected function emulate_bound_params($sql, array $params=null) {
+ if (empty($params)) {
+ return $sql;
+ }
+ /// ok, we have verified sql statement with ? and correct number of params
+ $return = strtok($sql, '?');
+ foreach ($params as $param) {
+ if (is_bool($param)) {
+ $return .= (int)$param;
+ } else if (is_null($param)) {
+ $return .= 'NULL';
+ } else if (is_numeric($param)) {
+ $return .= $param;
+ } else {
+ $param = $this->mysqli->real_escape_string($param);
+ $return .= "'$param'";
+ }
+ $return .= strtok('?');
+ }
+ return $return;
+ }
+
+ /**
+ * Execute general sql query. Should be used only when no other method suitable.
+ * Do NOT use this to make changes in db structure, use database_manager::execute_sql() instead!
+ * @param string $sql query
+ * @param array $params query parameters
+ * @return bool success
+ */
+ public function execute($sql, array $params=null) {
+ list($sql, $params, $type) = $this->fix_sql_params($sql, $params);
+
+ if (strpos($sql, ';') !== false) {
+ debugging('Error: Multiple sql statements found or bound parameters not used properly in query!');
+ return false;
+ }
+
+ $rawsql = $this->emulate_bound_params($sql, $params);
+
+ $this->writes++;
+
+ $result = $this->mysqli->query($rawsql);
+
+ if ($result === false) {
+ $this->report_error($sql, $params);
+ return false;
+
+ } else if ($result === true) {
+ return true;
+
+ } else {
+ $result->close();
+ return true;
+ }
+ }
+
+ /**
+ * Get a number of records as a moodle_recordset using a SQL statement.
+ *
+ * Since this method is a little less readable, use of it should be restricted to
+ * code where it's possible there might be large datasets being returned. For known
+ * small datasets use get_records_sql - it leads to simpler code.
+ *
+ * The return type is as for @see function get_recordset.
+ *
+ * @param string $sql the SQL select query to execute.
+ * @param array $params array of sql parameters
+ * @param int $limitfrom return a subset of records, starting at this point (optional, required if $limitnum is set).
+ * @param int $limitnum return a subset comprising this many records (optional, required if $limitfrom is set).
+ * @return mixed an moodle_recorset object, or false if an error occured.
+ */
+ public function get_recordset_sql($sql, array $params=null, $limitfrom=0, $limitnum=0) {
+ list($sql, $params, $type) = $this->fix_sql_params($sql, $params);
+ $rawsql = $this->emulate_bound_params($sql, $params);
+
+ if ($limitfrom or $limitnum) {
+ $limitfrom = (int)$limitfrom;
+ $limitnum = (int)$limitnum;
+ if ($limitnum < 1) {
+ $limitnum = "18446744073709551615";
+ }
+ $rawsql .= " LIMIT $limitfrom, $limitnum";
+ }
+
+ $this->reads++;
+ // no MYSQLI_USE_RESULT here, it would block write ops on affected tables
+ $result = $this->mysqli->query($rawsql, MYSQLI_STORE_RESULT);
+
+ if ($result === false) {
+ $this->report_error($sql, $params);
+ return false;
+ }
+
+ return $this->create_recordset($result);
+ }
+
+ protected function create_recordset($result) {
+ return new mysqli_native_moodle_recordset($result);
+ }
+
+ /**
+ * Get a number of records as an array of objects using a SQL statement.
+ *
+ * Return value as for @see function get_records.
+ *
+ * @param string $sql the SQL select query to execute. The first column of this SELECT statement
+ * must be a unique value (usually the 'id' field), as it will be used as the key of the
+ * returned array.
+ * @param array $params array of sql parameters
+ * @param int $limitfrom return a subset of records, starting at this point (optional, required if $limitnum is set).
+ * @param int $limitnum return a subset comprising this many records (optional, required if $limitfrom is set).
+ * @return mixed an array of objects, or empty array if no records were found, or false if an error occured.
+ */
+ public function get_records_sql($sql, array $params=null, $limitfrom=0, $limitnum=0) {
+ list($sql, $params, $type) = $this->fix_sql_params($sql, $params);
+ $rawsql = $this->emulate_bound_params($sql, $params);
+
+ if ($limitfrom or $limitnum) {
+ $limitfrom = (int)$limitfrom;
+ $limitnum = (int)$limitnum;
+ if ($limitnum < 1) {
+ $limitnum = "18446744073709551615";
+ }
+ $rawsql .= " LIMIT $limitfrom, $limitnum";
+ }
+
+ $this->reads++;
+ $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++;
+ $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;
+ }
+
+ $this->writes++;
+
+ $fields = implode(',', array_keys($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);
+
+ $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;
+ }
+
+ $this->writes++;
+
+ $sets = array();
+ foreach ($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);
+
+ $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++;
+ $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++;
+ $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 === '') {
+ //TODO: error
+ }
+ 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 === '') {
+ //TODO: error
+ }
+ 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';
+ }
+}
projects / moodle.git / commitdiff