Question

所以，我的项目有一个使用 Sequelize 设置的 MySQL 数据库，后端是用 nodeJS 编写的。我正在尝试对我的数据库执行简单的迁移，向 4 个不同的表添加一个新列。

运行迁移时，出现以下错误：

== 20210419115251-add-duplication-of-column-feature: migrating =======

ERROR: Deadlock found when trying to get lock; try restarting transaction

这是我的代码：

'use strict';
module.exports = {
  up: (queryInterface, Sequelize) => {
    return Promise.all([
      queryInterface.addColumn('Forms', 'duplicationOf', {
        type: Sequelize.INTEGER,
        after: 'state'
      }),
      queryInterface.addColumn('FormFields', 'duplicationOf', {
        type: Sequelize.INTEGER,
        after: 'reconcileType'
      }),
      queryInterface.addColumn('FormFieldsOptions', 'duplicationOf', {
        type: Sequelize.INTEGER,
        after: 'height'
      }),
      queryInterface.addColumn('FormFieldsLogics', 'duplicationOf', {
        type: Sequelize.INTEGER,
        after: 'data'
      })
    ]);
  },

  down: (queryInterface, Sequelize) => {
    return Promise.all([
      queryInterface.removeColumn('Forms', 'duplicationOf'),
      queryInterface.removeColumn('FormFields', 'duplicationOf'),
      queryInterface.removeColumn('FormFieldsOptions', 'duplicationOf'),
      queryInterface.removeColumn('FormFieldsLogics', 'duplicationOf')
    ]);
  }
};

我错过了什么？提前非常感谢

Answer 1

尝试用 Sequelize 事务包装它以确保一切都像这样成功执行：

您可以在他们的文档页面 here 上找到它。

'use strict';
module.exports = {
  up: (queryInterface, Sequelize) => {
    return queryInterface.sequelize.transaction(t => {
      return Promise.all([
        queryInterface.addColumn('Forms', 'duplicationOf', {
          type: Sequelize.INTEGER,
          after: 'state'
        }, { transaction: t }),
        queryInterface.addColumn('FormFields', 'duplicationOf', {
          type: Sequelize.INTEGER,
          after: 'reconcileType'
        }, { transaction: t }),
        queryInterface.addColumn('FormFieldsOptions', 'duplicationOf', {
          type: Sequelize.INTEGER,
          after: 'height'
        }, { transaction: t }),
        queryInterface.addColumn('FormFieldsLogics', 'duplicationOf', {
          type: Sequelize.INTEGER,
          after: 'data'
        }, { transaction: t })
      ]);
    });
  },
  down: (queryInterface, Sequelize) => {
    return queryInterface.sequelize.transaction(t => {
      return Promise.all([
        queryInterface.removeColumn('Forms', 'duplicationOf', { transaction: t }),
        queryInterface.removeColumn('FormFields', 'duplicationOf', { transaction: t }),
        queryInterface.removeColumn('FormFieldsOptions', 'duplicationOf', { transaction: t }),
        queryInterface.removeColumn('FormFieldsLogics', 'duplicationOf', { transaction: t })
      ]);
    });
  }
};

在 Sequelize 上运行迁移会引发死锁错误

1 个答案: