TinyDB - 儲存型別

TinyDB 有兩種儲存型別：JSON 和記憶體中。預設情況下，TinyDB 將資料儲存在 JSON 檔案中。建立資料庫時，你需要指定在計算機上儲存 JSON 檔案的路徑。

在 JSON 檔案中儲存資料

首先，我們看看如何使用 JSON 檔案儲存資料 -

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

示例 1

此示例展示瞭如何將多個文件插入 JSON 檔案 -

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"
   }
])

在這裡，我們在 "storage.json" 中插入了 5 個文件。要驗證記錄，請使用以下查詢 -

db.all()

它將顯示 "storage.json" 檔案的內容 -

[
   {
      "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"
   }
]

使用記憶體中儲存資料

現在，我們看看如何使用 "記憶體中" 儲存資料 -

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

示例 2

以下示例展示瞭如何將多個文件插入預設儲存記憶體中 -

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"
   }
])

要驗證是否已插入文件，請使用以下查詢 -

object.all()

以下 輸出顯示了已插入的資料 -

[
   {
      "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"
   }
]