/lib/ddl/mysql_sql_generator.php
PHP | 643 lines | 377 code | 70 blank | 196 comment | 65 complexity | 7b322e437e5eacea8878f3641c5bb650 MD5 | raw file
Possible License(s): Apache-2.0, LGPL-2.1, BSD-3-Clause, MIT, GPL-3.0
- <?php
- // This file is part of Moodle - http://moodle.org/
- //
- // Moodle is free software: you can redistribute it and/or modify
- // it under the terms of the GNU General Public License as published by
- // the Free Software Foundation, either version 3 of the License, or
- // (at your option) any later version.
- //
- // Moodle 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 General Public License for more details.
- //
- // You should have received a copy of the GNU General Public License
- // along with Moodle. If not, see <http://www.gnu.org/licenses/>.
- /**
- * Mysql specific SQL code generator.
- *
- * @package core_ddl
- * @copyright 1999 onwards Martin Dougiamas http://dougiamas.com
- * 2001-3001 Eloy Lafuente (stronk7) http://contiento.com
- * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
- */
- defined('MOODLE_INTERNAL') || die();
- require_once($CFG->libdir.'/ddl/sql_generator.php');
- /**
- * This class generate SQL code to be used against MySQL
- * It extends XMLDBgenerator so everything can be
- * overridden as needed to generate correct SQL.
- *
- * @package core_ddl
- * @copyright 1999 onwards Martin Dougiamas http://dougiamas.com
- * 2001-3001 Eloy Lafuente (stronk7) http://contiento.com
- * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
- */
- class mysql_sql_generator extends sql_generator {
- // Only set values that are different from the defaults present in XMLDBgenerator
- /** @var string Used to quote names. */
- public $quote_string = '`';
- /** @var string To define the default to set for NOT NULLs CHARs without default (null=do nothing).*/
- public $default_for_char = '';
- /** @var bool To specify if the generator must use some DEFAULT clause to drop defaults.*/
- public $drop_default_value_required = true;
- /** @var string The DEFAULT clause required to drop defaults.*/
- public $drop_default_value = null;
- /** @var string To force primary key names to one string (null=no force).*/
- public $primary_key_name = '';
- /** @var string Template to drop PKs. 'TABLENAME' and 'KEYNAME' will be replaced from this template.*/
- public $drop_primary_key = 'ALTER TABLE TABLENAME DROP PRIMARY KEY';
- /** @var string Template to drop UKs. 'TABLENAME' and 'KEYNAME' will be replaced from this template.*/
- public $drop_unique_key = 'ALTER TABLE TABLENAME DROP KEY KEYNAME';
- /** @var string Template to drop FKs. 'TABLENAME' and 'KEYNAME' will be replaced from this template.*/
- public $drop_foreign_key = 'ALTER TABLE TABLENAME DROP FOREIGN KEY KEYNAME';
- /** @var bool True if the generator needs to add extra code to generate the sequence fields.*/
- public $sequence_extra_code = false;
- /** @var string The particular name for inline sequences in this generator.*/
- public $sequence_name = 'auto_increment';
- public $add_after_clause = true; // Does the generator need to add the after clause for fields
- /** @var string Characters to be used as concatenation operator.*/
- public $concat_character = null;
- /** @var string The SQL template to alter columns where the 'TABLENAME' and 'COLUMNSPECS' keywords are dynamically replaced.*/
- public $alter_column_sql = 'ALTER TABLE TABLENAME MODIFY COLUMN COLUMNSPECS';
- /** @var string SQL sentence to drop one index where 'TABLENAME', 'INDEXNAME' keywords are dynamically replaced.*/
- public $drop_index_sql = 'ALTER TABLE TABLENAME DROP INDEX INDEXNAME';
- /** @var string SQL sentence to rename one index where 'TABLENAME', 'OLDINDEXNAME' and 'NEWINDEXNAME' are dynamically replaced.*/
- public $rename_index_sql = null;
- /** @var string SQL sentence to rename one key 'TABLENAME', 'OLDKEYNAME' and 'NEWKEYNAME' are dynamically replaced.*/
- public $rename_key_sql = null;
- /** Maximum size of InnoDB row in Antelope file format */
- const ANTELOPE_MAX_ROW_SIZE = 8126;
- /**
- * Reset a sequence to the id field of a table.
- *
- * @param xmldb_table|string $table name of table or the table object.
- * @return array of sql statements
- */
- public function getResetSequenceSQL($table) {
- if ($table instanceof xmldb_table) {
- $tablename = $table->getName();
- } else {
- $tablename = $table;
- }
- // From http://dev.mysql.com/doc/refman/5.0/en/alter-table.html
- $value = (int)$this->mdb->get_field_sql('SELECT MAX(id) FROM {'.$tablename.'}');
- $value++;
- return array("ALTER TABLE $this->prefix$tablename AUTO_INCREMENT = $value");
- }
- /**
- * Calculate proximate row size when using InnoDB
- * tables in Antelope row format.
- *
- * Note: the returned value is a bit higher to compensate for
- * errors and changes of column data types.
- *
- * @deprecated since Moodle 2.9 MDL-49723 - please do not use this function any more.
- */
- public function guess_antolope_row_size(array $columns) {
- throw new coding_exception('guess_antolope_row_size() can not be used any more, please use guess_antelope_row_size() instead.');
- }
- /**
- * Calculate proximate row size when using InnoDB tables in Antelope row format.
- *
- * Note: the returned value is a bit higher to compensate for errors and changes of column data types.
- *
- * @param xmldb_field[]|database_column_info[] $columns
- * @return int approximate row size in bytes
- */
- public function guess_antelope_row_size(array $columns) {
- if (empty($columns)) {
- return 0;
- }
- $size = 0;
- $first = reset($columns);
- if (count($columns) > 1) {
- // Do not start with zero because we need to cover changes of field types and
- // this calculation is most probably not be accurate.
- $size += 1000;
- }
- if ($first instanceof xmldb_field) {
- foreach ($columns as $field) {
- switch ($field->getType()) {
- case XMLDB_TYPE_TEXT:
- $size += 768;
- break;
- case XMLDB_TYPE_BINARY:
- $size += 768;
- break;
- case XMLDB_TYPE_CHAR:
- $bytes = $field->getLength() * 3;
- if ($bytes > 768) {
- $bytes = 768;
- }
- $size += $bytes;
- break;
- default:
- // Anything else is usually maximum 8 bytes.
- $size += 8;
- }
- }
- } else if ($first instanceof database_column_info) {
- foreach ($columns as $column) {
- switch ($column->meta_type) {
- case 'X':
- $size += 768;
- break;
- case 'B':
- $size += 768;
- break;
- case 'C':
- $bytes = $column->max_length * 3;
- if ($bytes > 768) {
- $bytes = 768;
- }
- $size += $bytes;
- break;
- default:
- // Anything else is usually maximum 8 bytes.
- $size += 8;
- }
- }
- }
- return $size;
- }
- /**
- * Given one correct xmldb_table, returns the SQL statements
- * to create it (inside one array).
- *
- * @param xmldb_table $xmldb_table An xmldb_table instance.
- * @return array An array of SQL statements, starting with the table creation SQL followed
- * by any of its comments, indexes and sequence creation SQL statements.
- */
- public function getCreateTableSQL($xmldb_table) {
- // First find out if want some special db engine.
- $engine = $this->mdb->get_dbengine();
- // Do we know collation?
- $collation = $this->mdb->get_dbcollation();
- // Do we need to use compressed format for rows?
- $rowformat = "";
- $size = $this->guess_antelope_row_size($xmldb_table->getFields());
- if ($size > self::ANTELOPE_MAX_ROW_SIZE) {
- if ($this->mdb->is_compressed_row_format_supported()) {
- $rowformat = "\n ROW_FORMAT=Compressed";
- }
- }
- $utf8mb4rowformat = $this->mdb->get_row_format_sql($engine, $collation);
- $rowformat = ($utf8mb4rowformat == '') ? $rowformat : $utf8mb4rowformat;
- $sqlarr = parent::getCreateTableSQL($xmldb_table);
- // This is a very nasty hack that tries to use just one query per created table
- // because MySQL is stupidly slow when modifying empty tables.
- // Note: it is safer to inject everything on new lines because there might be some trailing -- comments.
- $sqls = array();
- $prevcreate = null;
- $matches = null;
- foreach ($sqlarr as $sql) {
- if (preg_match('/^CREATE TABLE ([^ ]+)/', $sql, $matches)) {
- $prevcreate = $matches[1];
- $sql = preg_replace('/\s*\)\s*$/s', '/*keyblock*/)', $sql);
- // Let's inject the extra MySQL tweaks here.
- if ($engine) {
- $sql .= "\n ENGINE = $engine";
- }
- if ($collation) {
- if (strpos($collation, 'utf8_') === 0) {
- $sql .= "\n DEFAULT CHARACTER SET utf8";
- }
- $sql .= "\n DEFAULT COLLATE = $collation ";
- }
- if ($rowformat) {
- $sql .= $rowformat;
- }
- $sqls[] = $sql;
- continue;
- }
- if ($prevcreate) {
- if (preg_match('/^ALTER TABLE '.$prevcreate.' COMMENT=(.*)$/s', $sql, $matches)) {
- $prev = array_pop($sqls);
- $prev .= "\n COMMENT=$matches[1]";
- $sqls[] = $prev;
- continue;
- }
- if (preg_match('/^CREATE INDEX ([^ ]+) ON '.$prevcreate.' (.*)$/s', $sql, $matches)) {
- $prev = array_pop($sqls);
- if (strpos($prev, '/*keyblock*/')) {
- $prev = str_replace('/*keyblock*/', "\n, KEY $matches[1] $matches[2]/*keyblock*/", $prev);
- $sqls[] = $prev;
- continue;
- } else {
- $sqls[] = $prev;
- }
- }
- if (preg_match('/^CREATE UNIQUE INDEX ([^ ]+) ON '.$prevcreate.' (.*)$/s', $sql, $matches)) {
- $prev = array_pop($sqls);
- if (strpos($prev, '/*keyblock*/')) {
- $prev = str_replace('/*keyblock*/', "\n, UNIQUE KEY $matches[1] $matches[2]/*keyblock*/", $prev);
- $sqls[] = $prev;
- continue;
- } else {
- $sqls[] = $prev;
- }
- }
- }
- $prevcreate = null;
- $sqls[] = $sql;
- }
- foreach ($sqls as $key => $sql) {
- $sqls[$key] = str_replace('/*keyblock*/', "\n", $sql);
- }
- return $sqls;
- }
- /**
- * Given one xmldb_table and one xmldb_field, return the SQL statements needed to add the field to the table.
- *
- * @param xmldb_table $xmldb_table The table related to $xmldb_field.
- * @param xmldb_field $xmldb_field The instance of xmldb_field to create the SQL from.
- * @param string $skip_type_clause The type clause on alter columns, NULL by default.
- * @param string $skip_default_clause The default clause on alter columns, NULL by default.
- * @param string $skip_notnull_clause The null/notnull clause on alter columns, NULL by default.
- * @return array The SQL statement for adding a field to the table.
- */
- public function getAddFieldSQL($xmldb_table, $xmldb_field, $skip_type_clause = NULL, $skip_default_clause = NULL, $skip_notnull_clause = NULL) {
- $sqls = parent::getAddFieldSQL($xmldb_table, $xmldb_field, $skip_type_clause, $skip_default_clause, $skip_notnull_clause);
- if ($this->table_exists($xmldb_table)) {
- $tablename = $xmldb_table->getName();
- $size = $this->guess_antelope_row_size($this->mdb->get_columns($tablename));
- $size += $this->guess_antelope_row_size(array($xmldb_field));
- if ($size > self::ANTELOPE_MAX_ROW_SIZE) {
- if ($this->mdb->is_compressed_row_format_supported()) {
- $format = strtolower($this->mdb->get_row_format($tablename));
- if ($format === 'compact' or $format === 'redundant') {
- // Change the format before conversion so that we do not run out of space.
- array_unshift($sqls, "ALTER TABLE {$this->prefix}$tablename ROW_FORMAT=Compressed");
- }
- }
- }
- }
- return $sqls;
- }
- public function getAlterFieldSQL($xmldb_table, $xmldb_field, $skip_type_clause = NULL, $skip_default_clause = NULL, $skip_notnull_clause = NULL)
- {
- $tablename = $xmldb_table->getName();
- $dbcolumnsinfo = $this->mdb->get_columns($tablename);
- if (($this->mdb->has_breaking_change_sqlmode()) &&
- ($dbcolumnsinfo[$xmldb_field->getName()]->meta_type == 'X') &&
- ($xmldb_field->getType() == XMLDB_TYPE_INTEGER)) {
- // Ignore 1292 ER_TRUNCATED_WRONG_VALUE Truncated incorrect INTEGER value: '%s'.
- $altercolumnsqlorig = $this->alter_column_sql;
- $this->alter_column_sql = str_replace('ALTER TABLE', 'ALTER IGNORE TABLE', $this->alter_column_sql);
- $result = parent::getAlterFieldSQL($xmldb_table, $xmldb_field, $skip_type_clause, $skip_default_clause, $skip_notnull_clause);
- // Restore the original ALTER SQL statement pattern.
- $this->alter_column_sql = $altercolumnsqlorig;
- return $result;
- }
- return parent::getAlterFieldSQL($xmldb_table, $xmldb_field, $skip_type_clause, $skip_default_clause, $skip_notnull_clause);
- }
- /**
- * Given one correct xmldb_table, returns the SQL statements
- * to create temporary table (inside one array).
- *
- * @param xmldb_table $xmldb_table The xmldb_table object instance.
- * @return array of sql statements
- */
- public function getCreateTempTableSQL($xmldb_table) {
- // Do we know collation?
- $collation = $this->mdb->get_dbcollation();
- $this->temptables->add_temptable($xmldb_table->getName());
- $sqlarr = parent::getCreateTableSQL($xmldb_table);
- // Let's inject the extra MySQL tweaks.
- foreach ($sqlarr as $i=>$sql) {
- if (strpos($sql, 'CREATE TABLE ') === 0) {
- // We do not want the engine hack included in create table SQL.
- $sqlarr[$i] = preg_replace('/^CREATE TABLE (.*)/s', 'CREATE TEMPORARY TABLE $1', $sql);
- if ($collation) {
- if (strpos($collation, 'utf8_') === 0) {
- $sqlarr[$i] .= " DEFAULT CHARACTER SET utf8";
- }
- $sqlarr[$i] .= " DEFAULT COLLATE $collation ROW_FORMAT=DYNAMIC";
- }
- }
- }
- return $sqlarr;
- }
- /**
- * Given one correct xmldb_table, returns the SQL statements
- * to drop it (inside one array).
- *
- * @param xmldb_table $xmldb_table The table to drop.
- * @return array SQL statement(s) for dropping the specified table.
- */
- public function getDropTableSQL($xmldb_table) {
- $sqlarr = parent::getDropTableSQL($xmldb_table);
- if ($this->temptables->is_temptable($xmldb_table->getName())) {
- $sqlarr = preg_replace('/^DROP TABLE/', "DROP TEMPORARY TABLE", $sqlarr);
- }
- return $sqlarr;
- }
- /**
- * Given one XMLDB Type, length and decimals, returns the DB proper SQL type.
- *
- * @param int $xmldb_type The xmldb_type defined constant. XMLDB_TYPE_INTEGER and other XMLDB_TYPE_* constants.
- * @param int $xmldb_length The length of that data type.
- * @param int $xmldb_decimals The decimal places of precision of the data type.
- * @return string The DB defined data type.
- */
- public function getTypeSQL($xmldb_type, $xmldb_length=null, $xmldb_decimals=null) {
- switch ($xmldb_type) {
- case XMLDB_TYPE_INTEGER: // From http://mysql.com/doc/refman/5.0/en/numeric-types.html!
- if (empty($xmldb_length)) {
- $xmldb_length = 10;
- }
- if ($xmldb_length > 9) {
- $dbtype = 'BIGINT';
- } else if ($xmldb_length > 6) {
- $dbtype = 'INT';
- } else if ($xmldb_length > 4) {
- $dbtype = 'MEDIUMINT';
- } else if ($xmldb_length > 2) {
- $dbtype = 'SMALLINT';
- } else {
- $dbtype = 'TINYINT';
- }
- $dbtype .= '(' . $xmldb_length . ')';
- break;
- case XMLDB_TYPE_NUMBER:
- $dbtype = $this->number_type;
- if (!empty($xmldb_length)) {
- $dbtype .= '(' . $xmldb_length;
- if (!empty($xmldb_decimals)) {
- $dbtype .= ',' . $xmldb_decimals;
- }
- $dbtype .= ')';
- }
- break;
- case XMLDB_TYPE_FLOAT:
- $dbtype = 'DOUBLE';
- if (!empty($xmldb_decimals)) {
- if ($xmldb_decimals < 6) {
- $dbtype = 'FLOAT';
- }
- }
- if (!empty($xmldb_length)) {
- $dbtype .= '(' . $xmldb_length;
- if (!empty($xmldb_decimals)) {
- $dbtype .= ',' . $xmldb_decimals;
- } else {
- $dbtype .= ', 0'; // In MySQL, if length is specified, decimals are mandatory for FLOATs
- }
- $dbtype .= ')';
- }
- break;
- case XMLDB_TYPE_CHAR:
- $dbtype = 'VARCHAR';
- if (empty($xmldb_length)) {
- $xmldb_length='255';
- }
- $dbtype .= '(' . $xmldb_length . ')';
- if ($collation = $this->mdb->get_dbcollation()) {
- if (strpos($collation, 'utf8_') === 0) {
- $dbtype .= " CHARACTER SET utf8";
- }
- $dbtype .= " COLLATE $collation";
- }
- break;
- case XMLDB_TYPE_TEXT:
- $dbtype = 'LONGTEXT';
- if ($collation = $this->mdb->get_dbcollation()) {
- if (strpos($collation, 'utf8_') === 0) {
- $dbtype .= " CHARACTER SET utf8";
- }
- $dbtype .= " COLLATE $collation";
- }
- break;
- case XMLDB_TYPE_BINARY:
- $dbtype = 'LONGBLOB';
- break;
- case XMLDB_TYPE_DATETIME:
- $dbtype = 'DATETIME';
- }
- return $dbtype;
- }
- /**
- * Given one xmldb_table and one xmldb_field, return the SQL statements needed to add its default
- * (usually invoked from getModifyDefaultSQL()
- *
- * @param xmldb_table $xmldb_table The xmldb_table object instance.
- * @param xmldb_field $xmldb_field The xmldb_field object instance.
- * @return array Array of SQL statements to create a field's default.
- */
- public function getCreateDefaultSQL($xmldb_table, $xmldb_field) {
- // Just a wrapper over the getAlterFieldSQL() function for MySQL that
- // is capable of handling defaults
- return $this->getAlterFieldSQL($xmldb_table, $xmldb_field);
- }
- /**
- * Given one correct xmldb_field and the new name, returns the SQL statements
- * to rename it (inside one array).
- *
- * @param xmldb_table $xmldb_table The table related to $xmldb_field.
- * @param xmldb_field $xmldb_field The instance of xmldb_field to get the renamed field from.
- * @param string $newname The new name to rename the field to.
- * @return array The SQL statements for renaming the field.
- */
- public function getRenameFieldSQL($xmldb_table, $xmldb_field, $newname) {
- // NOTE: MySQL is pretty different from the standard to justify this overloading.
- // Need a clone of xmldb_field to perform the change leaving original unmodified
- $xmldb_field_clone = clone($xmldb_field);
- // Change the name of the field to perform the change
- $xmldb_field_clone->setName($newname);
- $fieldsql = $this->getFieldSQL($xmldb_table, $xmldb_field_clone);
- $sql = 'ALTER TABLE ' . $this->getTableName($xmldb_table) . ' CHANGE ' .
- $this->getEncQuoted($xmldb_field->getName()) . ' ' . $fieldsql;
- return array($sql);
- }
- /**
- * Given one xmldb_table and one xmldb_field, return the SQL statements needed to drop its default
- * (usually invoked from getModifyDefaultSQL()
- *
- * Note that this method may be dropped in future.
- *
- * @param xmldb_table $xmldb_table The xmldb_table object instance.
- * @param xmldb_field $xmldb_field The xmldb_field object instance.
- * @return array Array of SQL statements to create a field's default.
- *
- * @todo MDL-31147 Moodle 2.1 - Drop getDropDefaultSQL()
- */
- public function getDropDefaultSQL($xmldb_table, $xmldb_field) {
- // Just a wrapper over the getAlterFieldSQL() function for MySQL that
- // is capable of handling defaults
- return $this->getAlterFieldSQL($xmldb_table, $xmldb_field);
- }
- /**
- * Returns the code (array of statements) needed to add one comment to the table.
- *
- * @param xmldb_table $xmldb_table The xmldb_table object instance.
- * @return array Array of SQL statements to add one comment to the table.
- */
- function getCommentSQL ($xmldb_table) {
- $comment = '';
- if ($xmldb_table->getComment()) {
- $comment .= 'ALTER TABLE ' . $this->getTableName($xmldb_table);
- $comment .= " COMMENT='" . $this->addslashes(substr($xmldb_table->getComment(), 0, 60)) . "'";
- }
- return array($comment);
- }
- /**
- * Given one object name and it's type (pk, uk, fk, ck, ix, uix, seq, trg).
- *
- * (MySQL requires the whole xmldb_table object to be specified, so we add it always)
- *
- * This is invoked from getNameForObject().
- * Only some DB have this implemented.
- *
- * @param string $object_name The object's name to check for.
- * @param string $type The object's type (pk, uk, fk, ck, ix, uix, seq, trg).
- * @param string $table_name The table's name to check in
- * @return bool If such name is currently in use (true) or no (false)
- */
- public function isNameInUse($object_name, $type, $table_name) {
- switch($type) {
- case 'ix':
- case 'uix':
- // First of all, check table exists
- $metatables = $this->mdb->get_tables();
- if (isset($metatables[$table_name])) {
- // Fetch all the indexes in the table
- if ($indexes = $this->mdb->get_indexes($table_name)) {
- // Look for existing index in array
- if (isset($indexes[$object_name])) {
- return true;
- }
- }
- }
- break;
- }
- return false; //No name in use found
- }
- /**
- * Returns an array of reserved words (lowercase) for this DB
- * @return array An array of database specific reserved words
- */
- public static function getReservedWords() {
- // This file contains the reserved words for MySQL databases.
- $reserved_words = array (
- // From http://dev.mysql.com/doc/refman/6.0/en/reserved-words.html.
- 'accessible', 'add', 'all', 'alter', 'analyze', 'and', 'as', 'asc',
- 'asensitive', 'before', 'between', 'bigint', 'binary',
- 'blob', 'both', 'by', 'call', 'cascade', 'case', 'change',
- 'char', 'character', 'check', 'collate', 'column',
- 'condition', 'connection', 'constraint', 'continue',
- 'convert', 'create', 'cross', 'current_date', 'current_time',
- 'current_timestamp', 'current_user', 'cursor', 'database',
- 'databases', 'day_hour', 'day_microsecond',
- 'day_minute', 'day_second', 'dec', 'decimal', 'declare',
- 'default', 'delayed', 'delete', 'desc', 'describe',
- 'deterministic', 'distinct', 'distinctrow', 'div', 'double',
- 'drop', 'dual', 'each', 'else', 'elseif', 'enclosed', 'escaped',
- 'exists', 'exit', 'explain', 'false', 'fetch', 'float', 'float4',
- 'float8', 'for', 'force', 'foreign', 'from', 'fulltext', 'grant',
- 'group', 'having', 'high_priority', 'hour_microsecond',
- 'hour_minute', 'hour_second', 'if', 'ignore', 'in', 'index',
- 'infile', 'inner', 'inout', 'insensitive', 'insert', 'int', 'int1',
- 'int2', 'int3', 'int4', 'int8', 'integer', 'interval', 'into', 'is',
- 'iterate', 'join', 'key', 'keys', 'kill', 'leading', 'leave', 'left',
- 'like', 'limit', 'linear', 'lines', 'load', 'localtime', 'localtimestamp',
- 'lock', 'long', 'longblob', 'longtext', 'loop', 'low_priority', 'master_heartbeat_period',
- 'master_ssl_verify_server_cert', 'match', 'mediumblob', 'mediumint', 'mediumtext',
- 'middleint', 'minute_microsecond', 'minute_second',
- 'mod', 'modifies', 'natural', 'not', 'no_write_to_binlog',
- 'null', 'numeric', 'on', 'optimize', 'option', 'optionally',
- 'or', 'order', 'out', 'outer', 'outfile', 'overwrite', 'precision', 'primary',
- 'procedure', 'purge', 'raid0', 'range', 'read', 'read_only', 'read_write', 'reads', 'real',
- 'references', 'regexp', 'release', 'rename', 'repeat', 'replace',
- 'require', 'restrict', 'return', 'revoke', 'right', 'rlike', 'schema',
- 'schemas', 'second_microsecond', 'select', 'sensitive',
- 'separator', 'set', 'show', 'smallint', 'soname', 'spatial',
- 'specific', 'sql', 'sqlexception', 'sqlstate', 'sqlwarning',
- 'sql_big_result', 'sql_calc_found_rows', 'sql_small_result',
- 'ssl', 'starting', 'straight_join', 'table', 'terminated', 'then',
- 'tinyblob', 'tinyint', 'tinytext', 'to', 'trailing', 'trigger', 'true',
- 'undo', 'union', 'unique', 'unlock', 'unsigned', 'update',
- 'upgrade', 'usage', 'use', 'using', 'utc_date', 'utc_time',
- 'utc_timestamp', 'values', 'varbinary', 'varchar', 'varcharacter',
- 'varying', 'when', 'where', 'while', 'with', 'write', 'x509',
- 'xor', 'year_month', 'zerofill',
- // Added in MySQL 8.0, compared to MySQL 5.7:
- // https://dev.mysql.com/doc/refman/8.0/en/keywords.html#keywords-new-in-current-series.
- '_filename', 'admin', 'cume_dist', 'dense_rank', 'empty', 'except', 'first_value', 'grouping', 'groups',
- 'json_table', 'lag', 'last_value', 'lead', 'nth_value', 'ntile',
- 'of', 'over', 'percent_rank', 'persist', 'persist_only', 'rank', 'recursive', 'row_number',
- 'system', 'window'
- );
- return $reserved_words;
- }
- }