[英]how can i get count of deleted rows with Typeorm delete function?
[英]How can I get values from a TypeORM property decorator
import { PrimaryColumn, Column } from 'typeorm';
export class LocationStatus {
@PrimaryColumn({ name: 'location_id' })
locationId: string;
@Column({ name: 'area_code', type: 'int' })
areaCode: number;
}
我花了几个小时试图弄清楚如何从属性装饰器@Column()
检索名称属性值location_id
和area_code
,但没有运气。 我不确定是否有可能获得属性列表。
从typeorm
源代码(此处: 1 , 2 , 3 , 4 )来看,您可以通过全局变量typeormMetadataArgsStorage
(如window.typeormMetadataArgsStorage
或global.typeormMetadataArgsStorage
)访问各种内容。 探索它,我相信你会找到你想要的东西:
const global_context = ??? // depends on your environment
const property_to_look_for = `areaCode`
const name = global_context.typeormMetadataArgsStorage
.columns
.filter(col => col.propertyName === property_to_look_for && col.target === LocationStatus)
.options
.name
console.log(name)
更新
对于那些目前像我一样使用Nest
,这是我迄今为止所做的。
import { getMetadataArgsStorage, InsertResult } from 'typeorm';
export class PinLocationStatusRepository extends Repository<PinLocationStatus> {
// Column names in this array, the value should not be modified.
// For instance, the location_id value "location_ko_01" won't be changed.
private static immutableColumnNames = ['location_id', ...];
private static mutableColumnFound(name: string): boolean {
return PinLocationStatusRepository.immutableColumnNames.every(colName => colName !== name);
}
savePinLocation(state: PinLocationStatus): Promise<InsertResult> {
const columns = getMetadataArgsStorage()
.columns.filter(({ target }) => target === PinLocationStatus)
.map(({ options, propertyName }) => (!options.name ? propertyName : options.name))
.reduce((columns, name) => {
if (PinLocationStatusRepository.mutableColumnFound(name)) {
columns.push(name);
}
return columns;
}, []);
return this.createQueryBuilder()
.insert()
.into(PinLocationStatus)
.values(state)
.orUpdate({ overwrite: columns }) // ['area_code']
.execute();
}
}
@Column()
装饰器中提取列名。overwrite
属性。 除非area_code
是不可变列,否则您将获得正确的结果。
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