TinyDB - 存储类型

TinyDB 有两种存储类型:JSON 和内存中。 TinyDB 默认情况下将数据存储在 JSON 文件中。 创建数据库时，您需要指定JSON文件在计算机上的存储路径。

将数据存储在 JSON 文件中

首先，让我们看看如何使用 JSON 文件来存储数据 −

from tinydb import TinyDB, where
db = TinyDB('path/to/file_name.json')

示例 1

在此示例中，我们展示了如何将多个文档插入到 JSON 文件中 −

from tinydb import TinyDB
db = TinyDB('storage.json')
db.insert_multiple([
   {
      "roll_number":1,
      "st_name":"elen",
      "mark":250,
      "subject":"TinyDB",
      "address":"delhi"
   },
   {
      "roll_number":2,
      "st_name":"Ram",
      "mark":[
         250,
         280
      ],
      "subject":[
         "TinyDB",
         "MySQL"
      ],
      "address":"delhi"
   },
   {
      "roll_number":3,
      "st_name":"kevin",
      "mark":[
         180,
         200
      ],
      "subject":[
         "oracle",
         "sql"
      ],
      "address":"keral"
   },
   {
      "roll_number":4,
      "st_name":"lakhan",
      "mark":200,
      "subject":"MySQL",
      "address":"mumbai"
   },
   {
      "roll_number":5,
      "st_name":"karan",
      "mark":275,
      "subject":"oracle",
      "address":"benglore"
   }
])

在这里，我们在"storage.json"中插入了 5 个文档。 要验证记录，请使用以下查询 −

db.all()

It will show the contents of "storage.json" file −

[
   {
      "roll_number":1,
      "st_name":"elen",
      "mark":250,
      "subject":"TinyDB",
      "address":"delhi"
   },
   {
      "roll_number":2,
      "st_name":"Ram",
      "mark":[
         250,
         280
      ],
      "subject":[
         "TinyDB",
         "MySQL"
      ],
      "address":"delhi"
   },
   {
      "roll_number":3,
      "st_name":"kevin",
      "mark":[
         180,
         200
      ],
      "subject":[
         "oracle",
         "sql"
      ],
      "address":"keral"
   },
   {
      "roll_number":4,
      "st_name":"lakhan",
      "mark":200,
      "subject":"MySQL",
      "address":"mumbai"
   },
   {
      "roll_number":5,
      "st_name":"karan",
      "mark":275,
      "subject":"oracle",
      "address":"benglore"
   }
]

使用内存中存储数据

现在，让我们看看如何使用"内存中"来存储数据 −

from tinydb import TinyDB
from tinydb.storages import MemoryStorage
object = TinyDB(storage = MemoryStorage)
TinyDB.DEFAULT_STORAGE = MemoryStorage

示例 2

以下示例显示如何在默认存储内存中插入多个文档−

from tinydb import TinyDB
from tinydb.storages import MemoryStorage
object = TinyDB(storage = MemoryStorage)
TinyDB.DEFAULT_STORAGE = MemoryStorage
object.insert_multiple([
   {
      "roll_number":1,
      "st_name":"elen",
      "mark":250,
      "subject":"TinyDB",
      "address":"delhi"
   },
   {
      "roll_number":2,
      "st_name":"Ram",
      "mark":[
         250,
         280
      ],
      "subject":[
         "TinyDB",
         "MySQL"
      ],
      "address":"delhi"
   },
   {
      "roll_number":3,
      "st_name":"kevin",
      "mark":[
         180,
         200
      ],
      "subject":[
         "oracle",
         "sql"
      ],
      "address":"keral"
   },
   {
      "roll_number":4,
      "st_name":"lakan",
      "mark":200,
      "subject":"MySQL",
      "address":"mumbai"
   },
   {
      "roll_number":5,
      "st_name":"karan",
      "mark":275,
      "subject":"oracle",
      "address":"benglore"
   }
])

要验证文档是否已插入，请使用以下查询 −

object.all()

以下输出显示插入的数据 −

[
   {
      "roll_number":1,
      "st_name":"elen",
      "mark":250,
      "subject":"TinyDB",
      "address":"delhi"
   },
   {
      "roll_number":2,
      "st_name":"Ram",
      "mark":[
         250,
         280
      ],
      "subject":[
         "TinyDB",
         "MySQL"
      ],
      "address":"delhi"
   },
   {
      "roll_number":3,
      "st_name":"kevin",
      "mark":[
         180,
         200
      ],
      "subject":[
         "oracle",
         "sql"
      ],
      "address":"keral"
   },
   {
      "roll_number":4,
      "st_name":"lakan",
      "mark":200,
      "subject":"MySQL",
      "address":"mumbai"
   },
   {
      "roll_number":5,
      "st_name":"karan",
      "mark":275,
      "subject":"oracle",
      "address":"benglore"
   }
]