数据库操作上下文

数据库操作上下文是基于请求上下文实现，所以数据库操作上下文也是请求级别的。在数据库上下文中主要提供了与数据库操作相关的方法。

定义

export namespace OrmContext {
    export function getEntityManager(name = DEFAULT_CONNECTION_NAME): EntityManager {
        ...
    }
    export function getRepository<Entity>(target: ObjectType<Entity>|EntitySchema<Entity>|string, name?: string): Repository<Entity>  {
            ...
    }
    export function getTreeRepository<Entity>(target: ObjectType<Entity>|EntitySchema<Entity>|string, name?: string): TreeRepository<Entity>  {
              ...
    }
    export function getMongoRepository<Entity>(target: ObjectType<Entity>|EntitySchema<Entity>|string, name?: string): MongoRepository<Entity>  {
        ...
    }
    export function getCustomRepository<T>(customRepository: ObjectType<T>, name?: string): T {
        ...
    }
    export function pushEntityManager(name: string, entityManager: EntityManager): void {
        ...
    }
    export function popEntityManager(name: string): EntityManager | undefined {
        ...
    }
}