docs: uniCloud database query

docs/uniCloud/cf-database.md

@@ -892,6 +892,131 @@ db.collection('articles').where({
   }) 
 })
 ```
+
+### 查询数组字段@querywitharr
+
+假设数据表class内有以下数据，可以使用下面两种方式查询数组内包含指定值
+
+```js
+{
+  "_id": "1",
+  "students": ["li","wang"]
+}
+{
+  "_id": "2",
+  "students": ["wang","li"]
+}
+{
+  "_id": "3",
+  "students": ["zhao","qian"]
+}
+```
+
+#### 指定下标查询
+
+```js
+const index = 1
+const res = await db.collection('class').where({
+  ['students.' + index]: 'wang'
+})
+.get()
+```
+
+```js
+// 查询结果如下
+{
+  data: [{
+    "_id": "1",
+    "students": ["li","wang"]
+  }]
+}
+```
+
+#### 不指定下标查询
+
+```js
+const res = await db.collection('class').where({
+  students: 'wang'
+})
+.get()
+```
+
+查询结果如下
+
+```js
+{
+  data: [{
+    "_id": "1",
+    "students": ["li","wang"]
+  },{
+    "_id": "1",
+    "students": ["wang","li"]
+  }]
+}
+```
+
+#### 数组内是对象
+
+如果将上面class内的数据改为如下形式
+
+```js
+{
+  "_id": "1",
+  "students": [{
+    name: "li"
+  },{
+    name: "wang"
+  }]
+}
+{
+  "_id": "2",
+  "students": [{
+    name: "wang"
+  },{
+    name: "li"
+  }]
+}
+{
+  "_id": "3",
+  "students": [{
+    name: "zhao"
+  },{
+    name: "qian"
+  }]
+}
+```
+
+不指定下标查询的写法可以修改为
+
+```js
+const res = await db.collection('class').where({
+  'students.name': 'wang'
+})
+.get()
+```
+
+查询结果如下
+
+```js
+{
+  data: [{
+    "_id": "1",
+    "students": [{
+      name: "li"
+    },{
+      name: "wang"
+    }]
+  },
+  {
+    "_id": "2",
+    "students": [{
+      name: "wang"
+    },{
+      name: "li"
+    }]
+  }]
+}
+```
 
 ## 删除文档
 

docs/uniCloud/clientdb.md

@@ -281,7 +281,7 @@ sql写法，对js工程师而言有学习成本，而且无法处理非关系型
 <template>
 	<view class="content">
 		<input @input="onKeyInput" placeholder="请输入搜索值" />
-		<unicloud-db v-slot:default="{data, loading, error, options}" collection="goods" :where=`/${searchVal}/i.test(name)`>
+		<unicloud-db v-slot:default="{data, loading, error, options}" collection="goods" :where=`${new RegExp(searchVal, 'i')}.test(name)`>
 			<view v-if="error">{{error.message}}</view>
 			<view v-else>