May 20, 2021 WeChat Mini Program Development Document
Get collection data, or get collection data that is filtered based on query criteria.
If no limit is specified, a maximum of 20 records are taken by default.
If no skip is specified, it starts by default with the 0 record, which is often used for plying, as can be seen in the second sample code in this section.
The function signature is as follows:
function get(options?: object): Promise<Result>
Description of the parameters
Options is an optional parameter and is an object in the following format, such as pass-in success, fail, complete, which means that a callback style is used and Promise is not returned.
| The field name | Type | Required | The default | Description |
|---|---|---|---|---|
| success | Function | Whether | Successful callbacks, callbacks to incoming parameters Result contain the results of the query, the Result definition is below | |
| fail | Function | Whether | Failed callback | |
| complete | Function | Whether | Callback function at the end of the call (both successful and failed) |
Returns a description of the value
If the options parameter is not passed, or if the incoming options parameter does not have a success, fail, complete field, a Promise is returned, otherwise no value is returned. Promise's resolve and reject results are defined as follows:
| Description of the results | |
|---|---|
| resolve | The results of the query, the Result definition can be found below |
| reject | The reason for the failure |
Result description
The result of the success callback and the result of Promise Resolve result are objects that are structured as follows:
| Field | Type | Description |
|---|---|---|
| data | Array | An array of the results of a query, each element of the data is an Object, representing a record |
Sample code 1
Get my premises list
Callback style
const db = wx.cloud.database()
db.collection('todos').where({
_openid: 'xxx' // 填入当前用户 openid
}).get({
success: function(res) {
console.log(res.data)
}
})
Promise style
const db = wx.cloud.database()
db.collection('todos').where({
_openid: 'xxx' // 填入当前用户 openid
}).get().then(res => {
console.log(res.data)
})
Sample Code 2: Subthering Data
Get the list of the second page of my second page, assume 10 pages, now you have to take Page 2, you can specify the SKIP 10 records
// Promise 风格
const db = wx.cloud.database()
db.collection('todos')
.where({
_openid: 'xxx', // 填入当前用户 openid
})
.skip(10) // 跳过结果集中的前 10 条，从第 11 条开始返回
.limit(10) // 限制返回数量为 10 条
.get()
.then(res => {
console.log(res.data)
})
.catch(err => {
console.error(err)
})