682 lines
14 KiB
Markdown
682 lines
14 KiB
Markdown
# Repository
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## Overview
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On a given `Collection` object, you can get its `Repository` object to perform read and write operations on the data table.
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```javascript
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const { UserCollection } = require("./collections");
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const UserRepository = UserCollection.repository;
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const user = await UserRepository.findOne({
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filter: {
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id: 1
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},
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});
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user.name = "new name";
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await user.save();
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```
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### Query
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#### Basic Query
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On the `Repository` object, call the `find*` methods to perform query. The `filter` parameter is supported by all query methods to filter the data.
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```javascript
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// SELECT * FROM users WHERE id = 1
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userRepository.find({
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filter: {
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id: 1
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}
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});
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```
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#### Operator
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The `filter` parameter in the `Repository` also provides a variety of operators to perform more diverse queries.
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```javascript
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// SELECT * FROM users WHERE age > 18
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userRepository.find({
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filter: {
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age: {
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$gt: 18
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}
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}
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});
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// SELECT * FROM users WHERE age > 18 OR name LIKE '%张%'
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userRepository.find({
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filter: {
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$or: [
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{ age: { $gt: 18 } },
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{ name: { $like: "%张%" } }
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]
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}
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});
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```
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Refer to [Filter Operators](/api/database/operators) for more details on operators.
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#### Field Control
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Control the output fields by the `fields`, `except`, and `appends` parameters when performing query.
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* `fields`: Specify output fields
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* `except`: Exclude output fields
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* `appends`: Append output associated fields
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```javascript
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// The result contains only the <i>id</i> and <i>name</i> fields
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userRepository.find({
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fields: ["id", "name"],
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});
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// The result does not contain only the <i>password</i> field
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userRepository.find({
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except: ["password"],
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});
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// The result contains data associated with the <i>posts</i> object
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userRepository.find({
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appends: ["posts"],
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});
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```
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#### Associated Field Query
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The `filter` parameter supports filtering by associated fields, for example:
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```javascript
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// Find the <i>user</i> objects whose associated posts have title of "post title"
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userRepository.find({
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filter: {
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"posts.title": "post title"
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}
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});
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```
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Associated fields can also be nested:
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```javascript
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// Find the <i>user</i> objects whose associated posts have comments containing "keywords"
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await userRepository.find({
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filter: {
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"posts.comments.content": {
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$like: "%keywords%"
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}
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}
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});
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```
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#### Sort
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Sort query results by the `sort` parameter.
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```javascript
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// SELECT * FROM users ORDER BY age
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await userRepository.find({
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sort: 'age'
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});
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// SELECT * FROM users ORDER BY age DESC
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await userRepository.find({
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sort: '-age'
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});
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// SELECT * FROM users ORDER BY age DESC, name ASC
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await userRepository.find({
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sort: ['-age', "name"],
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});
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```
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Sort by the field of the associated object is also supported:
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```javascript
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await userRepository.find({
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sort: 'profile.createdAt'
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});
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```
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### Create
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#### Basic Create
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Create new data objects via `Repository`.
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```javascript
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await userRepository.create({
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name: "Mark",
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age: 18,
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});
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// INSERT INTO users (name, age) VALUES ('Mark', 18)
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// Bulk creation
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await userRepository.create([
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{
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name: "Mark",
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age: 18,
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},
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{
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name: "Alex",
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age: 20,
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},
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])
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```
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#### Create Association
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Create associated objects at the same time of creating data. Similar to query, nested use of associated objects is also supported. For example:
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```javascript
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await userRepository.create({
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name: "张三",
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age: 18,
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posts: [
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{
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title: "post title",
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content: "post content",
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tags: [
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{
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name: "tag1",
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},
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{
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name: "tag2",
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},
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],
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},
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],
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});
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// When crearing a user, creat a post to associate with the user, and create tags to associate with the post
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```
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If the associated object is already in the database, you can pass its ID to create an association with it.
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```javascript
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const tag1 = await tagRepository.findOne({
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filter: {
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name: "tag1"
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},
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});
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await userRepository.create({
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name: "Mark",
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age: 18,
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posts: [
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{
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title: "post title",
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content: "post content",
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tags: [
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{
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id: tag1.id, // Create an association with an existing associated object
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},
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{
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name: "tag2",
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},
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],
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},
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],
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});
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```
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### Update
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#### Basic Update
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After getting the data object, you can modify the properties directly on the data object (`Model`), and then call the `save` method to save the changes.
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```javascript
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const user = await userRepository.findOne({
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filter: {
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name: "Mark",
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},
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});
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user.age = 20;
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await user.save();
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```
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The data object `Model` is inherited from Sequelize Model, refer to [Sequelize Model](https://sequelize.org/master/manual/model-basics.html) for the operations on `Model`.
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Or update data via `Repository`:
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```javascript
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// Update the records that meet the filtering condition
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await userRepository.update({
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filter: {
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name: "Mark",
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},
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values: {
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age: 20,
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},
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});
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```
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Control which fields to update by the `whitelist` and `blacklist` parameters, for example:
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```javascript
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await userRepository.update({
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filter: {
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name: "Mark",
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},
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values: {
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age: 20,
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name: "Alex",
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},
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whitelist: ["age"], // Only update the <i>age</i> field
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});
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````
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#### Update Associated Field
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Associated objects can be set while updating, for example:
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```javascript
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const tag1 = tagRepository.findOne({
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filter: {
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id: 1
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},
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});
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await postRepository.update({
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filter: {
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id: 1
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},
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values: {
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title: "new post title",
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tags: [
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{
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id: tag1.id // Associate with tag1
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},
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{
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name: "tag2", // Create new tag and associate with it
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},
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],
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},
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});
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await postRepository.update({
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filter: {
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id: 1
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},
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values: {
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tags: null // Disassociate post from tags
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},
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})
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```
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### Delete
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Call the `destroy()` method in `Repository` to perform the deletion operation. Filtering condition has to be specified to delete.
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```javascript
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await userRepository.destroy({
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filter: {
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status: "blocked",
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},
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});
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```
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## Constructor
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It is usually not called directly by the developer, the instantiation is done mainly by specifying a coressponding repository type that is already registered in the parameter of `db.colletion()`. Repository type is registered through `db.registerRepositories()`.
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**Signature**
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* `constructor(collection: Collection)`
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**Example**
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```ts
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import { Repository } from '@nocobase/database';
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class MyRepository extends Repository {
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async myQuery(sql) {
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return this.database.sequelize.query(sql);
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}
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}
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db.registerRepositories({
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books: MyRepository
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});
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db.collection({
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name: 'books',
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// here link to the registered repository
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repository: 'books'
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});
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await db.sync();
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const books = db.getRepository('books') as MyRepository;
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await books.myQuery('SELECT * FROM books;');
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```
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## Instance Member
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### `database`
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The database management instance where the context is located.
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### `collection`
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The corresponding data table management instance.
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### `model`
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The corresponding data model class.
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## Instance Method
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### `find()`
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Find datasets from the database with the specified filtering conditions and sorting, etc.
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**Signature**
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* `async find(options?: FindOptions): Promise<Model[]>`
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**Type**
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```typescript
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type Filter = FilterWithOperator | FilterWithValue | FilterAnd | FilterOr;
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type Appends = string[];
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type Except = string[];
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type Fields = string[];
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type Sort = string[] | string;
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interface SequelizeFindOptions {
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limit?: number;
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offset?: number;
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}
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interface FilterByTk {
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filterByTk?: TargetKey;
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}
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interface CommonFindOptions extends Transactionable {
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filter?: Filter;
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fields?: Fields;
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appends?: Appends;
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except?: Except;
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sort?: Sort;
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}
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type FindOptions = SequelizeFindOptions & CommonFindOptions & FilterByTk;
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```
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**Detailed Information**
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#### `filter: Filter`
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Query conditions for filtering data results. In the query parameters that passed in, `key` is the name of the field, `value` is the corresponding value. Operators can be used in conjunction with other filtering conditions.
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```typescript
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// Find records with name "foo" and age above 18
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repository.find({
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filter: {
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name: "foo",
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age: {
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$gt: 18,
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},
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}
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})
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```
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Refer to [Operators](./operators.md) for more information.
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#### `filterByTk: TargetKey`
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Query data by `TargetKey`, this is shortcut for the `filter` parameter. The field of `TargetKey` can be [configured](./collection.md#filtertargetkey) in `Collection`, the default is `primaryKey`.
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```typescript
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// By default, find records with id 1
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repository.find({
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filterByTk: 1,
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});
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```
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#### `fields: string[]`
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Query columns. It is used to control which data fields to output. With this parameter, only the specified fields will be returned.
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#### `except: string[]`
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Exclude columns. It is used to control which data fields to output. With this parameter, the specified fields will not be returned.
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#### `appends: string[]`
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Append columns. It is used to load associated data. With this parameter, the specified associated fields will be returned together.
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#### `sort: string[] | string`
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Specify the sorting method of the query results. The input parameter is the name of the field, by default is to sort in the ascending order (`asc`); a `-` symbol needs to be added before the field name to sort in the descending order (`desc`). For example, `['-id', 'name']` means to sort by `id desc, name asc`.
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#### `limit: number`
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Limit the number of results, same as `limit` in `SQL`.
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#### `offset: number`
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The offset of the query, same as `offset` in `SQL`.
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**Example**
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```ts
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const posts = db.getRepository('posts');
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const results = await posts.find({
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filter: {
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createdAt: {
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$gt: '2022-01-01T00:00:00.000Z',
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}
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},
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fields: ['title'],
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appends: ['user'],
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});
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```
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### `findOne()`
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Find a single piece of data from the database for specific conditions. Equivalent to `Model.findOne()` in Sequelize.
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**Signature**
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* `async findOne(options?: FindOneOptions): Promise<Model | null>`
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<embed src="./shared/find-one.md"></embed>
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**Example**
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```ts
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const posts = db.getRepository('posts');
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const result = await posts.findOne({
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filterByTk: 1,
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});
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```
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### `count()`
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Query a certain amount of data from the database for specific conditions. Equivalent to `Model.count()` in Sequelize.
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**Signature**
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* `count(options?: CountOptions): Promise<number>`
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**Type**
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```typescript
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interface CountOptions extends Omit<SequelizeCountOptions, 'distinct' | 'where' | 'include'>, Transactionable {
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filter?: Filter;
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}
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```
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**Example**
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```ts
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const books = db.getRepository('books');
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const count = await books.count({
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filter: {
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title: 'Three character classic'
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}
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});
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```
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### `findAndCount()`
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Find datasets from the database with the specified filtering conditions and return the number of results. Equivalent to `Model.findAndCountAll()` in Sequelize.
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**Signature**
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* `async findAndCount(options?: FindAndCountOptions): Promise<[Model[], number]>`
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**Type**
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```typescript
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type FindAndCountOptions = Omit<SequelizeAndCountOptions, 'where' | 'include' | 'order'> & CommonFindOptions;
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```
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**Detailed Information**
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The query parameters are the same as `find()`. An array is returned with the first element of the query results, and the second element of the total number of results.
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### `create()`
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Inserts a newly created data into the data table. Equivalent to `Model.create()` in Sequelize. When the data object to be created carries any assiciated field, the corresponding assiciated data record is created or updated along with it.
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**Signature**
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* `async create<M extends Model>(options: CreateOptions): Promise<M>`
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<embed src="./shared/create-options.md"></embed>
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**Example**
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```ts
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const posts = db.getRepository('posts');
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const result = await posts.create({
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values: {
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title: 'NocoBase 1.0 Release Notes',
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tags: [
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// Update data when there is a primary key and value of the associated table
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{ id: 1 },
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// Create data when there is no primary key and value
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{ name: 'NocoBase' },
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]
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},
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});
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```
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### `createMany()`
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Inserts multiple newly created data into the data table. This is equivalent to calling the `create()` method multiple times.
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**Signature**
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* `createMany(options: CreateManyOptions): Promise<Model[]>`
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**Type**
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```typescript
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interface CreateManyOptions extends BulkCreateOptions {
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records: Values[];
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}
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```
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**Detailed Information**
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* `records`: An array of data objects to be created.
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* `transaction`: Transaction object. If no transaction parameter is passed, the method will automatically create an internal transaction.
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**Example**
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```ts
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const posts = db.getRepository('posts');
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const results = await posts.createMany({
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records: [
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{
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title: 'NocoBase 1.0 Release Notes',
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tags: [
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// Update data when there is a primary key and value of the associated table
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{ id: 1 },
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// Create data when there is no primary key and value
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{ name: 'NocoBase' },
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]
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},
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{
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title: 'NocoBase 1.1 Release Notes',
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tags: [
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{ id: 1 }
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]
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},
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],
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});
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```
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### `update()`
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Update data in the data table. Equivalent to `Model.update()` in Sequelize. When the data object to be updated carries any associated field, the corresponding associated data record is created or updated along with it.
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**Signature**
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* `async update<M extends Model>(options: UpdateOptions): Promise<M>`
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<embed src="./shared/update-options.md"></embed>
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**Example**
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||
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```ts
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const posts = db.getRepository('posts');
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const result = await posts.update({
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filterByTk: 1,
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values: {
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title: 'NocoBase 1.0 Release Notes',
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tags: [
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// Update data when there is a primary key and value of the associated table
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{ id: 1 },
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// Create data when there is no primary key and value
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{ name: 'NocoBase' },
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]
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},
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});
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```
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### `destory()`
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Delete data from the data table. Equivalent to `Model.destroy()` in Sequelize.
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**Signature**
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* `async destory(options?: TargetKey | TargetKey[] | DestoryOptions): Promise<number>`
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**Type**
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```typescript
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interface DestroyOptions extends SequelizeDestroyOptions {
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filter?: Filter;
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filterByTk?: TargetKey | TargetKey[];
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truncate?: boolean;
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context?: any;
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}
|
||
```
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|
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**Detailed Information**
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||
|
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* `filter`：Specify the filtering conditions of the records to be deleted. Refer to the [`find()`](#find) method for the detailed usage of the filter.
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* `filterByTk`：Specify the filtering conditions by TargetKey.
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* `truncate`: Whether to empty the table data, this parameter is valid if no `filter` or `filterByTk` parameter is passed.
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* `transaction`: Transaction object. If no transaction parameter is passed, the method will automatically create an internal transaction.
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