Find 选项
Find 选项
基础选项
所有存储库和管理器find方法都接受可用于查询所需数据的特殊选项，而无需使用QueryBuilder：
select- 表示必须选择对象的哪些属性
userRepository.find({ select: ["firstName", "lastName"] });
relations- 关系需要加载主体。 也可以加载子关系（join和leftJoinAndSelect的简写）
userRepository.find({ relations: ["profile", "photos", "videos"] });
userRepository.find({ relations: ["profile", "photos", "videos", "videos.video_attributes"] });
join- 需要为实体执行联接，扩展版对的"relations"。
userRepository.find({
join: {
alias: "user",
leftJoinAndSelect: {
profile: "user.profile",
photo: "user.photos",
video: "user.videos"
}
}
});
where-查询实体的简单条件。
userRepository.find({ where: { firstName: "Timber", lastName: "Saw" } });
查询嵌入实体列应该根据定义它的层次结构来完成。 例：
userRepository.find({ where: { name: { first: "Timber", last: "Saw" } } });
使用 OR 运算符查询：
userRepository.find({
where: [{ firstName: "Timber", lastName: "Saw" }, { firstName: "Stan", lastName: "Lee" }]
});
将执行以下查询：
SELECT * FROM "user" WHERE ("firstName" = 'Timber' AND "lastName" = 'Saw') OR ("firstName" = 'Stan' AND "lastName" = 'Lee')
order- 选择排序
userRepository.find({
order: {
name: "ASC",
id: "DESC"
}
});
返回多个实体的find方法（find，findAndCount，findByIds），同时也接受以下选项：
skip- 偏移（分页）
userRepository.find({
skip: 5
});
take- limit (分页) - 得到的最大实体数。
userRepository.find({
take: 10
});
** 如果你正在使用带有 MSSQL 的 typeorm，并且想要使用take或limit，你必须正确使用 order，否则将会收到以下错误：'FETCH语句中NEXT选项的使用无效。'
userRepository.find({
order: {
columnName: "ASC"
},
skip: 0,
take: 10
});
cache- 启用或禁用查询结果缓存。 有关更多信息和选项，请参见caching。
userRepository.find({
cache: true
});
lock- 启用锁查询。 只能在findOne方法中使用。lock是一个对象，可以定义为：
{ mode: "optimistic", version: number|Date }
或者
{ mode: "pessimistic_read"|"pessimistic_write"|"dirty_read" }
例如:
userRepository.findOne(1, {
lock: { mode: "optimistic", version: 1 }
})
find 选项的完整示例：
userRepository.find({
select: ["firstName", "lastName"],
relations: ["profile", "photos", "videos"],
where: {
firstName: "Timber",
lastName: "Saw"
},
order: {
name: "ASC",
id: "DESC"
},
skip: 5,
take: 10,
cache: true
});
进阶选项
TypeORM 提供了许多内置运算符，可用于创建更复杂的查询：
Not
import { Not } from "typeorm";
const loadedPosts = await connection.getRepository(Post).find({
title: Not("About #1")
});
将执行以下查询：
SELECT * FROM "post" WHERE "title" != 'About #1'
LessThan
import { LessThan } from "typeorm";
const loadedPosts = await connection.getRepository(Post).find({
likes: LessThan(10)
});
将执行以下查询：
SELECT * FROM "post" WHERE "likes" < 10
LessThanOrEqual
import { LessThanOrEqual } from "typeorm";
const loadedPosts = await connection.getRepository(Post).find({
likes: LessThanOrEqual(10)
});
将执行以下查询：
SELECT * FROM "post" WHERE "likes" <= 10
MoreThan
import { MoreThan } from "typeorm";
const loadedPosts = await connection.getRepository(Post).find({
likes: MoreThan(10)
});
将执行以下查询：
SELECT * FROM "post" WHERE "likes" > 10
MoreThanOrEqual
import { MoreThanOrEqual } from "typeorm";
const loadedPosts = await connection.getRepository(Post).find({
likes: MoreThanOrEqual(10)
});
将执行以下查询：
SELECT * FROM "post" WHERE "likes" >= 10
Equal
import { Equal } from "typeorm";
const loadedPosts = await connection.getRepository(Post).find({
title: Equal("About #2")
});
将执行以下查询：
SELECT * FROM "post" WHERE "title" = 'About #2'
Like
import { Like } from "typeorm";
const loadedPosts = await connection.getRepository(Post).find({
title: Like("%out #%")
});
将执行以下查询：
SELECT * FROM "post" WHERE "title" LIKE '%out #%'
ILike
import { ILike } from "typeorm";
const loadedPosts = await connection.getRepository(Post).find({
title: ILike("%out #%")
});
将执行以下查询：
SELECT * FROM "post" WHERE "title" ILIKE '%out #%'
Between
import { Between } from "typeorm";
const loadedPosts = await connection.getRepository(Post).find({
likes: Between(1, 10)
});
将执行以下查询：
SELECT * FROM "post" WHERE "likes" BETWEEN 1 AND 10
In
import { In } from "typeorm";
const loadedPosts = await connection.getRepository(Post).find({
title: In(["About #2", "About #3"])
});
将执行以下查询：
SELECT * FROM "post" WHERE "title" IN ('About #2','About #3')
Any
import { Any } from "typeorm";
const loadedPosts = await connection.getRepository(Post).find({
title: Any(["About #2", "About #3"])
});
将执行以下查询： (Postgres notation):
SELECT * FROM "post" WHERE "title" = ANY(['About #2','About #3'])
IsNull
import { IsNull } from "typeorm";
const loadedPosts = await connection.getRepository(Post).find({
title: IsNull()
});
将执行以下查询：
SELECT * FROM "post" WHERE "title" IS NULL
Raw
import { Raw } from "typeorm";
const loadedPosts = await connection.getRepository(Post).find({
likes: Raw("1 + likes = 4")
});
将执行以下查询：
SELECT * FROM "post" WHERE 1 + "likes" = 4
注意：注意
Raw操作符。 它应该从提供的表达式执行纯 SQL，而不能包含用户输入，否则将导致 SQL 注入。
你还可以将这些运算符与Not运算符组合使用：
import { Not, MoreThan, Equal } from "typeorm";
const loadedPosts = await connection.getRepository(Post).find({
likes: Not(MoreThan(10)),
title: Not(Equal("About #2"))
});
将执行以下查询：
SELECT * FROM "post" WHERE NOT("likes" > 10) AND NOT("title" = 'About #2')
漫思
