如何在MySql中使用sequelize运行多个原始查询？

Question

我试图运行一个脚本,以便在sequelize syncs via之前从数据库中删除所有表 sequelize.sync({ force: true });

当我从控制台运行脚本时,脚本运行没有问题,当我尝试从我的node.js应用程序运行它时会出现问题; MySql返回一个解析错误.

的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;
});

错误

{ [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\';' }

我在Google和sequelize docs页面上找不到关于sequelize的多个原始查询的任何内容(我查找了该query方法的特定参数).

编辑:

我从一个SO克隆中找到了这个帖子,人们似乎有同样的问题,但我无法弄清楚解决方案是什么.

Answer 1

您可以multipleStatements使用该选项

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

您输入的任何内容dialectOptions都将传递给底层连接lib(在本例中mysql)

Answer 2

根据所使用的底层 mysql 模块，至少mysql/mysql2支持multipleStatements: true 连接设置。这将允许您一次发送多个查询。默认情况下，出于安全原因，它被禁用。