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体验新版 GitCode,发现更多精彩内容 >>
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00f8ec2b
编写于
4月 28, 2021
作者:
雪洛
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docs: uniCloud clientDB
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docs/uniCloud/clientdb.md
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@@ -620,6 +620,191 @@ db.collection('comment,user')
-
上述示例中如果order表的
`book_id`
字段是数组形式存放多个book_id,也跟上述写法一致,clientDB会自动根据字段类型进行联表查询
-
各个表的_id字段会默认带上,即使没有指定返回
#### 副表foreignKey联查@st-foreign-key
`2021年4月28日`
之前的clientDB版本,只支持主表的foreignKey,把副本内容嵌入主表的foreignKey字段下面。不支持处理副本的foreignKey。(如果你觉得能用,其实是bug,查出来的数是乱的,别依赖这种写法)
调整后,新版将正式支持副表foreignKey联查。将把副表的数据以数组的方式嵌入到主表中。
例:
数据库内schema及数据如下:
```
js
// comment - 评论表
// schema
{
"
bsonType
"
:
"
object
"
,
"
required
"
:
[],
"
permission
"
:
{
"
read
"
:
true
,
"
create
"
:
false
,
"
update
"
:
false
,
"
delete
"
:
false
},
"
properties
"
:
{
"
comment_id
"
:
{
"
bsonType
"
:
"
string
"
},
"
content
"
:
{
"
bsonType
"
:
"
string
"
},
"
article
"
:
{
"
bsonType
"
:
"
string
"
,
"
foreignKey
"
:
"
article.article_id
"
},
"
sender
"
:
{
"
bsonType
"
:
"
string
"
,
"
foreignKey
"
:
"
user.uid
"
},
"
receiver
"
:
{
"
bsonType
"
:
"
string
"
,
"
foreignKey
"
:
"
user.uid
"
}
}
}
// data
{
"
comment_id
"
:
"
1-1
"
,
"
content
"
:
"
comment1-1
"
,
"
article
"
:
"
1
"
,
"
sender
"
:
"
1
"
,
"
receiver
"
:
"
2
"
}
{
"
comment_id
"
:
"
1-2
"
,
"
content
"
:
"
comment1-2
"
,
"
article
"
:
"
1
"
,
"
sender
"
:
"
2
"
,
"
receiver
"
:
"
1
"
}
{
"
comment_id
"
:
"
2-1
"
,
"
content
"
:
"
comment2-1
"
,
"
article
"
:
"
2
"
,
"
sender
"
:
"
1
"
,
"
receiver
"
:
"
2
"
}
{
"
comment_id
"
:
"
2-2
"
,
"
content
"
:
"
comment2-2
"
,
"
article
"
:
"
2
"
,
"
sender
"
:
"
2
"
,
"
receiver
"
:
"
1
"
}
```
```
js
// article - 文章表
// schema
{
"
bsonType
"
:
"
object
"
,
"
required
"
:
[],
"
permission
"
:
{
"
read
"
:
true
,
"
create
"
:
false
,
"
update
"
:
false
,
"
delete
"
:
false
},
"
properties
"
:
{
"
article_id
"
:
{
"
bsonType
"
:
"
string
"
},
"
title
"
:
{
"
bsonType
"
:
"
string
"
},
"
content
"
:
{
"
bsonType
"
:
"
string
"
},
"
author
"
:
{
"
bsonType
"
:
"
string
"
,
"
foreignKey
"
:
"
user.uid
"
}
}
}
// data
{
"
article_id
"
:
"
1
"
,
"
title
"
:
"
title1
"
,
"
content
"
:
"
content1
"
,
"
author
"
:
"
1
"
}
{
"
article_id
"
:
"
2
"
,
"
title
"
:
"
title2
"
,
"
content
"
:
"
content2
"
,
"
author
"
:
"
1
"
}
{
"
article_id
"
:
"
3
"
,
"
title
"
:
"
title3
"
,
"
content
"
:
"
content3
"
,
"
author
"
:
"
2
"
}
```
以下查询使用comment表的article字段对应的foreignKey进行关联查询
```
js
db
.
collection
(
'
article,comment
'
)
.
where
(
'
article_id=="1"
'
)
.
field
(
'
content,article_id
'
)
.
get
()
```
查询结果如下:
```
js
[{
"
content
"
:
"
content1
"
,
"
article_id
"
:
{
"
comment
"
:
[{
// 逆向foreignKey查询时此处会自动插入一层副表表名
"
comment_id
"
:
"
1-1
"
,
"
content
"
:
"
comment1-1
"
,
"
article
"
:
"
1
"
,
"
sender
"
:
"
1
"
,
"
receiver
"
:
"
2
"
},
{
"
comment_id
"
:
"
1-2
"
,
"
content
"
:
"
comment1-2
"
,
"
article
"
:
"
1
"
,
"
sender
"
:
"
2
"
,
"
receiver
"
:
"
1
"
}]
}
}]
```
如需对上述查询的副表字段进行过滤,需要注意多插入的一层副表表名
```
js
// 过滤副表字段
db
.
collection
(
'
article,comment
'
)
.
where
(
'
article_id=="1"
'
)
.
field
(
'
content,article_id{comment{content}}
'
)
.
get
()
// 查询结果如下
[{
"
content
"
:
"
content1
"
,
"
article_id
"
:
{
"
comment
"
:
[{
使用副本foreignKey联查时此处会自动插入一层副表表名
"
content
"
:
"
comment1-1
"
},
{
"
content
"
:
"
comment1-2
"
}]
}
}]
```
### 查询记录过滤,where条件@where
> 代码块`dbget`
...
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