提交 ba7eae8f 编写于 作者: 雪洛's avatar 雪洛

docs: uniCloud db

上级 17bb3cd2
......@@ -1536,7 +1536,7 @@ db.runTransaction(callback: function, times: number)
```javascript
const db = uniCloud.database()
const _ = db.command
const dbCmd = db.command
exports.main = async (event) => {
try {
const result = await db.runTransaction(async transaction => {
......@@ -1546,11 +1546,11 @@ exports.main = async (event) => {
if (aaaRes.data && bbbRes.data) {
try {
const updateAAARes = await transaction.collection('account').doc('aaa').update({
amount: _.inc(-10)
amount: dbCmd.inc(-10)
})
const updateBBBRes = await transaction.collection('account').doc('bbb').update({
amount: _.inc(10)
amount: dbCmd.inc(10)
})
console.log(`transaction succeeded`)
......@@ -1609,7 +1609,7 @@ db.startTransaction()
```javascript
const db = uniCloud.database()
const _ = db.command
const dbCmd = db.command
exports.main = async (event) => {
const transaction = await db.startTransaction()
......@@ -1620,11 +1620,11 @@ exports.main = async (event) => {
if (aaaRes.data && bbbRes.data) {
const updateAAARes = await transaction.collection('account').doc('aaa').update({
amount: _.inc(-10)
amount: dbCmd.inc(-10)
})
const updateBBBRes = await transaction.collection('account').doc('bbb').update({
amount: _.inc(10)
amount: dbCmd.inc(10)
})
await transaction.commit()
......@@ -2838,7 +2838,8 @@ let res = await db.collection('orders').aggregate()
- books 的 stock 字段 大于或等于 orders 的 quantityorders 字段
```js
const db = cloud.database()
const $ = db.command.aggregate
const dbCmd = db.command
const $ = dbCmd.aggregate
let res = await db.collection('orders').aggregate()
.lookup({
from: 'books',
......@@ -2847,7 +2848,7 @@ let res = await db.collection('orders').aggregate()
order_quantity: '$quantity'
},
pipeline: $.pipeline()
.match(_.expr($.and([
.match(dbCmd.expr($.and([
$.eq(['$title', '$$order_book']),
$.gte(['$stock', '$$order_quantity'])
])))
......@@ -2993,9 +2994,9 @@ match({
```
```js
// 使用操作符
const _ = db.command
const dbCmd = db.command
match({
age: _.gt(18)
age: dbCmd.gt(18)
})
```
......@@ -3035,12 +3036,12 @@ match 过滤出文档后,还可以与其他流水线阶段配合使用。
比如下面这个例子,我们使用 group 进行搭配,计算 score 字段大于 80 的文档数量:
```js
const _ = db.command
const $ = _.aggregate
const dbCmd = db.command
const $ = dbCmd.aggregate
let res = await db.collection('articles')
.aggregate()
.match({
score: _.gt(80)
score: dbCmd.gt(80)
})
.group({
_id: null,
......
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