TypeORM大容量插入？

Question

如何在一个查询中批量插入多个记录，以便我数据库高效我想要创建office并将多个新设备插入到Office中。表/模型代码：

办公室

@Entity({ name: 'offices' })
export class Office extends Timestamps {

    @OneToMany(() => Equipment, (equipment: Equipment) => equipment.office, {
        onDelete: 'CASCADE',
        onUpdate: 'CASCADE'
    })
    equipment: Array<Equipment>;
}

设备

@Entity({ name: 'equipment' })
export class Equipment extends Timestamps {
    @Column({
        name: 'equipment_id',
        type: 'int',
        nullable: false,
        width: 2,
        default: 0
    })
    equipment_id: number;

    @ManyToOne(() => Office, (office: Office) => office.equipment)
    @JoinColumn({ name: 'office_id' })
    office: Office;
}

Answer 1

我建议你在关系中使用cascades属性：

@Entity({ name: 'offices' })
export class Office extends Timestamps {

    @OneToMany(() => Equipment, (equipment: Equipment) => equipment.office, {
        cascade: true, // <= here
        onDelete: 'CASCADE',
        onUpdate: 'CASCADE'
    })
    equipment: Array<Equipment>;
}

现在，如果在创建Office实例时设置设备，它会自动将设备实例插入到数据库中：

await Office.create({equipment: ['whatever']}).save();

或者，如果您对基于此link的存储库使用数据映射器方法

const officeRepository = connection.getRepository(Office);
const office = new Office();
const equipment1 = new Equipment(); // and set your properties or make more instances

office.equipment = [equipment1]; // or more instances
await officeRepository.save(office);