sequelize.js迁移执行序列
我想在同一个迁移中执行几个查询。它们是相关的,因此必须按特定顺序执行。这是我的迁移方法:sequelize.js迁移执行序列,sequelize.js,sequelize-cli,Sequelize.js,Sequelize Cli,我想在同一个迁移中执行几个查询。它们是相关的,因此必须按特定顺序执行。这是我的迁移方法: up: (queryInterface, Sequelize) => queryInterface.sequelize.transaction(transaction => Promise.all([ queryInterface.renameColumn(table, 'status', 'status_temp', { transaction }), queryInter
up: (queryInterface, Sequelize) =>
queryInterface.sequelize.transaction(transaction =>
Promise.all([
queryInterface.renameColumn(table, 'status', 'status_temp', { transaction }),
queryInterface.sequelize.query(
'ALTER TYPE enum_users_status RENAME TO enum_users_status_temp;',
{
transaction
}
),
queryInterface.addColumn(
table,
'isActive',
{
allowNull: false,
defaultValue: false,
type: Sequelize.BOOLEAN
},
{ transaction }
),
queryInterface.bulkUpdate(
table,
{
isActive: true
},
{
status: 'active'
},
{ transaction }
),
queryInterface.addColumn(
table,
'status',
{
allowNull: false,
defaultValue: STATUS_FREE,
type: Sequelize.ENUM(STATUS_FREE, STATUS_BUSY, STATUS_DELETED)
},
{ transaction }
),
])
),
当我在执行它时,命令以一种奇怪的方式混合在一起:
Executing (591dc838-4659-4de4-b605-54b7c03c527f): START TRANSACTION;
...
Executing (591dc838-4659-4de4-b605-54b7c03c527f): ALTER TYPE enum_users_status RENAME TO enum_users_status_temp;
Executing (591dc838-4659-4de4-b605-54b7c03c527f): ALTER TABLE "public"."users" ADD COLUMN "isActive" BOOLEAN NOT NULL DEFAULT false;
Executing (591dc838-4659-4de4-b605-54b7c03c527f): UPDATE "users" SET "isActive"=true WHERE "status" = 'active'
Executing (591dc838-4659-4de4-b605-54b7c03c527f): CREATE TYPE "public"."enum_users_status" AS ENUM('free', 'busy', 'deleted');ALTER TABLE "public"."users" ADD COLUMN "status" "public"."enum_users_status" NOT NULL DEFAULT 'free';
Executing (591dc838-4659-4de4-b605-54b7c03c527f): ALTER TABLE "users" RENAME COLUMN "status" TO "status_temp";
Executing (591dc838-4659-4de4-b605-54b7c03c527f): ROLLBACK;
我得到的错误是因为:
ERROR: column "status" of relation "users" already exists
有没有办法让这些查询按特定顺序运行
UPD:
我的预期结果是这样的
START TRANSACTION;
ALTER TABLE "users" RENAME COLUMN "status" TO "status_temp";
ALTER TYPE enum_users_status RENAME TO enum_users_status_temp;
ALTER TABLE "public"."users" ADD COLUMN "isNew" BOOLEAN NOT NULL DEFAULT true;
UPDATE "users" SET "isNew"=false WHERE "status_temp" = 'active';
CREATE TYPE "public"."enum_users_status" AS ENUM('free', 'busy', 'deleted');
ALTER TABLE "public"."users" ADD COLUMN "status" "public"."enum_users_status" NOT NULL DEFAULT 'free';
UPDATE "users" SET "status"='busy' WHERE "isFree" = false;
UPDATE "users" SET "status"='deleted' WHERE "status_temp" = 'deleted';
ALTER TABLE "public"."users" DROP COLUMN "isFree";
ALTER TABLE "public"."users" DROP COLUMN "status_temp";
发生这种情况是因为您正在使用
Promise.all
并行执行承诺。不能保证你的承诺会按规定的顺序执行。所以您需要使用。然后
方法来执行您的工作流
up: (queryInterface, Sequelize) =>
queryInterface.sequelize.transaction(transaction =>
queryInterface.renameColumn(table, 'status', 'status_temp', { transaction })
.then(() => queryInterface.sequelize.query(
'ALTER TYPE enum_users_status RENAME TO enum_users_status_temp;',
{
transaction
}
))
.then(...);
),
正如Eugene所指出的,您的问题是,您正在使用
Promise.all
调用所有迁移。我强烈建议您进行单独的文件迁移。这样,您的项目结构更好,新开发人员更容易理解
用于创建迁移的命令:
sequelize migration:generate --name [name-of-your-migration]
要执行创建顺序上的所有迁移以及尚未运行的迁移,请执行以下操作:
sequelize db:migrate
可以使用bluebirdjs函数和
{concurrency:1}
选项,如下所示:
const Promise = require('bluebird');
...
up: function (queryInterface, Sequelize) {
return Promise.map([
queryInterface.sequelize.query('SET FOREIGN_KEY_CHECKS = 0'),
queryInterface.addColumn(
'table1',
'column1',
{
type: Sequelize.INTEGER,
after: 'id',
defaultValue: 0
}),
queryInterface.sequelize.query('SET FOREIGN_KEY_CHECKS = 1'),
queryInterface.addColumn(
'table2',
'column2',
{
type: Sequelize.BOOLEAN,
after: 'column3',
defaultValue: 0
})
],
(promise) => promise,
{concurrency: 1}
);
}
注意:您可以将
concurrency
选项设置为n
,以便同时执行n
承诺谢谢。但我不确定这是否是个好主意。我想把所有逻辑上相关的查询放在一个文件中。这个例子已经过时了,但我需要:1。再创建一个字段2。删除一个现有字段3。更改状态字段PS:所有这些字段中的数据都应该从以前版本的字段中迁移过来,这就是为什么我把它们放在一起的原因+因为迁移都在同一个文件夹中,我认为让extrasIs成为可能不是一个好主意,只需按照我编写它们的顺序在一个事务中进行查询,而不使用这些字段然后()重复?我不明白那()有什么问题?使用async/await如果您不喜欢,那么()您将无法使用示例中的事务为什么?没有区别,这只是一个执行命令