Question

I am using python to copy one table (dictionary) to another (origin_dictionary) in SQLite, and here is my code to this part:

    def copyDictionaryToOrigin(self):
    dropTableQueryStr = "DROP TABLE IF EXISTS origin_dictionary"
    createTableQueryStr = "CREATE TABLE origin_dictionary (id INTEGER PRIMARY KEY AUTOINCREMENT, word TEXT, type TEXT)"
    syncTableQueryStr = "INSERT INTO origin_dictionary (word, type) SELECT word, type FROM dictionary"

    self.cur.execute(dropTableQueryStr)
    self.cur.fetchone()

    self.cur.execute(createTableQueryStr)
    result = self.cur.fetchone()

    self.cur.execute(syncTableQueryStr)
    result = self.cur.fetchone()

With running this code, I can see a origin_dictionary table is created, but there is no data in the table. I could not find out the reason why the data didn’t copy over to the new table. can someone please help me with this?

Answer 1

If you need to simply copy one table to another, why don’t you use CREATE TABLE ... AS SELECT? Also, you need to commit() your statements.

Simply use code below, and it should work:

import sqlite3
conn = sqlite3.connect(example.db")
cur = conn.cursor()
cur.execute("DROP TABLE IF EXISTS origin_dictionary")
cur.execute("CREATE TABLE origin_dictionary AS SELECT * FROM dictionary")
conn.commit()
conn.close()