How can I run multiple raw queries with sequelize in MySql?

Question

I am trying to run a script to drop all the tables from the database before sequelize syncs via sequelize.sync({ force: true });

The script runs with no problems when I run it from the console, the problem happens when I try to run it from my node.js application; MySql returns a parse error.

node.js

var dropAllTables = [
    'SET FOREIGN_KEY_CHECKS = 0;',
    'SET GROUP_CONCAT_MAX_LEN = 32768;',
    'SET @tables = NULL;',
    "SELECT GROUP_CONCAT('`', table_name, '`') INTO @tables FROM information_schema.tables WHERE table_schema = (SELECT DATABASE());",
    "SET @tables = CONCAT('DROP TABLE IF EXISTS ', @tables);",
    "SELECT IFNULL(@tables, 'SELECT 1') INTO @tables;",
    'PREPARE stmt FROM @tables;',
    'EXECUTE stmt;',
    'DEALLOCATE PREPARE stmt;',
    'SET FOREIGN_KEY_CHECKS = 1;',
    "SET GLOBAL sql_mode = 'STRICT_ALL_TABLES';"
].join(' ');

sequelize.query(dropAllTables, {
    raw: true
}).then(function() {
    return sequelize.sync({ force: true });
}).then(function() {
    console.log('Database recreated!');
    callback();
}, function(err) {
    throw err;
});

error

{ [Error: ER_PARSE_ERROR: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'SET GROUP_CONCAT_MAX_LEN = 32768; SET @tables = NULL; SELECT GROUP_CONCAT('`', t' at line 1] code: 'ER_PARSE_ERROR', errno: 1064, sqlState: '42000', index: 0, sql: 'SET FOREIGN_KEY_CHECKS = 0; SET GROUP_CONCAT_MAX_LEN = 32768; SET @tables = NULL; SELECT GROUP_CONCAT(\'`\', table_name, \'`\') INTO @tables FROM information_schema.tables WHERE table_schema = (SELECT DATABASE()); SET @tables = CONCAT(\'DROP TABLE IF EXISTS \', @tables); SELECT IFNULL(@tables, \'SELECT 1\') INTO @tables; PREPARE stmt FROM @tables; EXECUTE stmt; DEALLOCATE PREPARE stmt; SET FOREIGN_KEY_CHECKS = 1; SET GLOBAL sql_mode = \'STRICT_ALL_TABLES\';' }

I found nothing regarding multiple raw queries with sequelize in Google nor at sequelize docs page (I looked for a specific parameter for the query method).

EDIT:

I found this thread from an SO clone, where people seem to have the same problem but I can't figure out what the solution was.

Answer 1

You can pass the multipleStatements option using

new Sequelize(user, pass, db, {
  dialectOptions: {
    multipleStatements: true
  }
});

Anything you put into dialectOptions will be passed on to the underlying connection lib (in this case mysql)

Answer 2

Depending on the underlying mysql module being used, at least mysql/mysql2 supports the multipleStatements: true connection setting. This will allow you to send multiple queries at once. By default it is disabled for security reasons.