使用 TypeORM，将列添加到实体时，`SQLITE_CONSTRAINT: FOREIGN KEY 约束失败`

Question

我使用 TypeORM 作为 TypeScript ORM 库，带有 SQLite 数据库。

我有一个 TypeORM 实体，它与另一个实体Photo有@OneToOne关系，称为PhotoMetadata.

Photo.ts：

import {
  Entity,
  Column,
  PrimaryGeneratedColumn,
  OneToOne,
  BaseEntity,
} from 'typeorm';

import PhotoMetadata from './PhotoMetadata';

@Entity()
export default class Photo extends BaseEntity {
  @PrimaryGeneratedColumn()
  public id: number;

  @Column({ length: 100 })
  public name: string;

  @OneToOne(
    () => PhotoMetadata,
    (photoMetadata) => photoMetadata.photo,
    { cascade: true },
  )
  metadata: PhotoMetadata;
}

这里是PhotoMetadata.ts：

import {
  Entity,
  Column,
  PrimaryGeneratedColumn,
  OneToOne,
  JoinColumn,
} from 'typeorm';

import Photo from './Photo';

@Entity()
export default class PhotoMetadata {
  @PrimaryGeneratedColumn()
  id: number;

  @Column()
  comment: string;

  @OneToOne(
    () => Photo,
    (photo) => photo.metadata,
  )
  @JoinColumn()
  photo: Photo;
}

当我向 中添加一列时Photo，例如：

  @Column({ nullable: true })
  test: string;

然后运行应用程序，启用日志记录，我得到：

query: BEGIN TRANSACTION
query: SELECT * FROM "sqlite_master" WHERE "type" = 'table' AND "name" IN ('photo_metadata', 'photo', 'user')
query: SELECT * FROM "sqlite_master" WHERE "type" = 'index' AND "tbl_name" IN ('photo_metadata', 'photo', 'user')
query: PRAGMA table_info("user")
query: PRAGMA index_list("user")
query: PRAGMA foreign_key_list("user")
query: PRAGMA table_info("photo")
query: PRAGMA index_list("photo")
query: PRAGMA foreign_key_list("photo")
query: PRAGMA table_info("photo_metadata")
query: PRAGMA index_list("photo_metadata")
query: PRAGMA foreign_key_list("photo_metadata")
query: PRAGMA index_info("sqlite_autoindex_photo_metadata_1")
query: SELECT * FROM "sqlite_master" WHERE "type" = 'table' AND "name" = 'typeorm_metadata'
query: CREATE TABLE "temporary_photo_metadata" ("id" integer PRIMARY KEY AUTOINCREMENT NOT NULL, "comment" varchar NOT NULL, "photoId" integer, CONSTRAINT "UQ_99f01ed52303cc16139d69f7464" UNIQUE ("photoId"), CONSTRAINT "FK_99f01ed52303cc16139d69f7464" FOREIGN KEY ("photoId") REFERENCES "photo" ("id") ON DELETE NO ACTION ON UPDATE NO ACTION)
query: INSERT INTO "temporary_photo_metadata"("id", "comment", "photoId") SELECT "id", "comment", "photoId" FROM "photo_metadata"
query: DROP TABLE "photo_metadata"
query: ALTER TABLE "temporary_photo_metadata" RENAME TO "photo_metadata"
query: CREATE TABLE "temporary_photo" ("id" integer PRIMARY KEY AUTOINCREMENT NOT NULL, "name" varchar(100) NOT NULL)
query: INSERT INTO "temporary_photo"("id", "name") SELECT "id", "name" FROM "photo"
query: DROP TABLE "photo"
query failed: DROP TABLE "photo"
error: [Error: SQLITE_CONSTRAINT: FOREIGN KEY constraint failed] {
  errno: 19,
  code: 'SQLITE_CONSTRAINT'
}
query: ROLLBACK

我该如何解决这个问题？由于外键，删除我修改的 Photo 表似乎失败。

Answer 1

我尝试使用 TypeORM 迁移来做到这一点，但我遇到了同样的问题。

然后我从这个评论中了解到以下内容：

const connection = await createConnection();

await connection.query('PRAGMA foreign_keys=OFF');
await connection.synchronize();
await connection.query('PRAGMA foreign_keys=ON');

或者，如果您想改用迁移，请从此评论：

await connection.query("PRAGMA foreign_keys=OFF;");
await connection.runMigrations();
await connection.query("PRAGMA foreign_keys=ON;");

无论哪种情况，您都需要synchronize: false在ormconfig.json.