Drizzle ORM - 查询中包含或排除列

Drizzle | 查询中包含或排除列

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Drizzle 提供了灵活的 API，用于在查询中包含或排除列。要包含所有列，您可以使用 .select() 方法，如下所示：

index.ts

schema.ts

import { posts } from './schema';

const db = drizzle(...);

await db.select().from(posts);

// result type
type Result = {
  id: number;
  title: string;
  content: string;
  views: number;
}[];

import { integer, pgTable, serial, text } from 'drizzle-orm/pg-core';

export const posts = pgTable('posts', {
  id: serial('id').primaryKey(),
  title: text('title').notNull(),
  content: text('content').notNull(),
  views: integer('views').notNull().default(0),
});

要包含特定列，您可以使用 .select() 方法，如下所示：

await db.select({ title: posts.title }).from(posts);

// result type
type Result = {
  title: string;
}[];

要包含所有列并附加额外列，您可以使用 getTableColumns() 工具函数，如下所示：

import { getTableColumns, sql } from 'drizzle-orm';

await db
  .select({
    ...getTableColumns(posts),
    titleLength: sql<number>`length(${posts.title})`,
  })
  .from(posts);

// result type
type Result = {
  id: number;
  title: string;
  content: string;
  views: number;
  titleLength: number;
}[];

要排除列，您可以使用 getTableColumns() 工具函数，如下所示：

import { getTableColumns } from 'drizzle-orm';

const { content, ...rest } = getTableColumns(posts); // exclude "content" column

await db.select({ ...rest }).from(posts); // select all other columns

// result type
type Result = {
  id: number;
  title: string;
  views: number;
}[];

您可以通过这种方式在联接中包含或排除列

index.ts

schema.ts

import { eq, getTableColumns } from 'drizzle-orm';
import { comments, posts, users } from './db/schema';

// exclude "userId" and "postId" columns from "comments"
const { userId, postId, ...rest } = getTableColumns(comments);

await db
  .select({
    postId: posts.id, // include "id" column from "posts"
    comment: { ...rest }, // include all other columns
    user: users, // equivalent to getTableColumns(users)
  })
  .from(posts)
  .leftJoin(comments, eq(posts.id, comments.postId))
  .leftJoin(users, eq(users.id, posts.userId));

// result type
type Result = {
  postId: number;
  comment: {
    id: number;
    content: string;
    createdAt: Date;
  } | null;
  user: {
    id: number;
    name: string;
    email: string;
  } | null;
}[];

import { integer, pgTable, serial, text, timestamp } from 'drizzle-orm/pg-core';

export const users = pgTable('users', {
  id: serial('id').primaryKey(),
  name: text('name').notNull(),
  email: text('email').notNull(),
});

export const posts = pgTable('posts', {
  id: serial('id').primaryKey(),
  title: text('title').notNull(),
  content: text('content').notNull(),
  views: integer('views').notNull().default(0),
  userId: integer('user_id').notNull().references(() => users.id),
});

export const comments = pgTable('comments', {
  id: serial('id').primaryKey(),
  postId: integer('post_id').notNull().references(() => posts.id),
  userId: integer('user_id').notNull().references(() => users.id),
  content: text('content').notNull(),
  createdAt: timestamp('created_at').notNull().defaultNow(),
});

Drizzle 拥有实用的关系型查询 API，可让您轻松地在查询中包含或排除列。以下是如何包含所有列：

index.ts

schema.ts

import * as schema from './schema';

const db = drizzle(..., { schema });

await db.query.posts.findMany();

// result type
type Result = {
  id: number;
  title: string;
  content: string;
  views: number;
}[]

import { integer, pgTable, serial, text } from 'drizzle-orm/pg-core';

export const posts = pgTable('posts', {
  id: serial('id').primaryKey(),
  title: text('title').notNull(),
  content: text('content').notNull(),
  views: integer('views').notNull().default(0),
});

以下是如何使用关系型查询包含特定列：

await db.query.posts.findMany({
  columns: {
    title: true,
  },
});

// result type
type Result = {
  title: string;
}[]

以下是如何使用关系型查询包含所有列并附加额外列：

import { sql } from 'drizzle-orm';

await db.query.posts.findMany({
  extras: {
    titleLength: sql<number>`length(${posts.title})`.as('title_length'),
  },
});

// result type
type Result = {
  id: number;
  title: string;
  content: string;
  views: number;
  titleLength: number;
}[];

以下是如何使用关系型查询排除列：

await db.query.posts.findMany({
  columns: {
    content: false,
  },
});

// result type
type Result = {
  id: number;
  title: string;
  views: number;
}[]

以下是如何使用关系型查询，在关系中包含或排除列：

index.ts

schema.ts

import * as schema from './schema';

const db = drizzle(..., { schema });

await db.query.posts.findMany({
  columns: {
    id: true, // include "id" column
  },
  with: {
    comments: {
      columns: {
        userId: false, // exclude "userId" column
        postId: false, // exclude "postId" column
      },
    },
    user: true, // include all columns from "users" table
  },
});

// result type
type Result = {
  id: number;
  user: {
    id: number;
    name: string;
    email: string;
  };
  comments: {
    id: number;
    content: string;
    createdAt: Date;
  }[];
}[]

import { relations } from 'drizzle-orm';
import { integer, pgTable, serial, text, timestamp } from 'drizzle-orm/pg-core';

export const users = pgTable('users', {
  id: serial('id').primaryKey(),
  name: text('name').notNull(),
  email: text('email').notNull(),
});

export const posts = pgTable('posts', {
  id: serial('id').primaryKey(),
  title: text('title').notNull(),
  content: text('content').notNull(),
  views: integer('views').notNull().default(0),
  userId: integer('user_id').notNull().references(() => users.id),
});

export const comments = pgTable('comments', {
  id: serial('id').primaryKey(),
  postId: integer('post_id').notNull().references(() => posts.id),
  userId: integer('user_id').notNull().references(() => users.id),
  content: text('content').notNull(),
  createdAt: timestamp('created_at').notNull().defaultNow(),
});

export const usersRelations = relations(users, ({ many }) => ({
  posts: many(posts),
  comments: many(comments),
}));

export const postsRelations = relations(posts, ({ many, one }) => ({
  comments: many(comments),
  user: one(users, { fields: [posts.userId], references: [users.id] }),
}));

export const commentsRelations = relations(comments, ({ one }) => ({
  post: one(posts, { fields: [comments.postId], references: [posts.id] }),
  user: one(users, { fields: [comments.userId], references: [users.id] }),
}));

以下是如何为条件选择创建自定义解决方案：

index.ts

schema.ts

import { posts } from './schema';

const searchPosts = async (withTitle = false) => {
  await db
    .select({
      id: posts.id,
      ...(withTitle && { title: posts.title }),
    })
    .from(posts);
};

await searchPosts();
await searchPosts(true);

// result type
type Result = {
  id: number;
  title?: string | undefined;
}[];

import { integer, pgTable, serial, text } from 'drizzle-orm/pg-core';

export const posts = pgTable('posts', {
  id: serial('id').primaryKey(),
  title: text('title').notNull(),
  content: text('content').notNull(),
  views: integer('views').notNull().default(0),
});