sqlite3 python ATTACH DATABASE復制表.schema

Question

系統

• Python 2.7
• SQLite3

碼

我想通過將表從_bak.db復制到正在使用的.db中來恢復數據庫的備份。

conn = sqlite3.connect(os.path.join("data", "db", "Kanji-story.db"))
c = conn.cursor()
c.execute("DROP TABLE IF EXISTS current")

c.execute("ATTACH DATABASE ? AS db2", (os.path.join('data', 'db', 'Kanji-story_bak.db'),))

# TODO Code for Creating table with the same structure
c.execute("INSERT INTO main.current SELECT * FROM db2.current")

題

要執行最后一條語句，我首先必須在Kanji-story.db中創建一個表，其結構與Kanji-story_bak.db相同（請參閱＃TODO）。 如何創建具有相同結構的表 ？ 我知道SQLite3中有.schema命令，但是如何有效地使用該命令創建新表呢？

Answer 1

受到@CL答案的啟發。 ，完整代碼為：

conn = sqlite3.connect(os.path.join("data", "db", "Kanji-story.db"))
c = conn.cursor()
c.execute("DROP TABLE IF EXISTS current")

c.execute("ATTACH DATABASE ? AS db2", (os.path.join('data', 'db', 'Kanji-story_bak.db'),))

c.execute("SELECT sql FROM db2.sqlite_master WHERE type='table' AND name='current'")
c.execute(c.fetchone()[0]) # Contains: CREATE TABLE current (framenum INTEGER, nextKanji INTEGER)
c.execute("INSERT INTO main.current SELECT * FROM db2.current")

conn.commit()
conn.close()

Answer 2

SQLite沒有執行間接命令的機制。

要獲取原始表定義，您需要運行.schema內部使用的相同查詢：

SELECT sql FROM db2.sqlite_master WHERE type='table' AND name='current'

Answer 3

我的sqlite3版本3.18.0已create table main.current as select * from db2.current