Hello there! I'm new to TypeORM and haven't had much experience with ORM. I'm finding it a bit challenging to grasp the documentation and examples available online.
My main goal is to utilize the TypeORM QueryBuilder in order to create this specific query:
select first_name, last_name
from users u
inner join company_relations cr
on u.id = cr.id
I appreciate any assistance you can provide!
To enhance your functionality, focus on two key components: your entities and the query.
Here's an example of how your entities could be structured:
UserEntity.ts
@Entity('users')
export class UsersEntity {
// other attributes
@Column({ name: 'first_name', type: 'varchar' })
firstName: string;
@Column({ name: 'last_name', type: 'varchar' })
lastName: string;
@OneToMany(
() => CompanyRelationsEntity,
(companyRelationsEntity: CompanyRelationsEntity) => companyRelationsEntity.userId,
)
companyRelations: CompanyRelationEntity[];
}
CompanyRelationEntity.ts
@Entity('company_relations')
export class CompanyRelationEntity {
// Other attributes
@ManyToOne(
() => UsersEntity,
(userEntity: UsersEntity) => usersEntity.companyRelations,
)
@JoinColumn({ name: 'user_id', referencedColumnName: 'id' })
user: UserEntity;
}
With these in place, you can execute a query similar to the following:
await this.repository
.createQueryBuilder('u')
.select(['u.firstName', 'u.lastName'])
.innerJoin('m.companyRelations', 'cr')
.getOne();
For more detailed information, refer to the official documentation here
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