Jan-31-2020, 07:37 AM
My script used to migrate data from SQLite to Postgres in Python. I'm using threading module to speed up transfer tables but I got a error
Can someone help me edit it? Thanks
My script :
Error:sqlite3.ProgrammingError: SQLite objects created in a thread can only be used in that same thread
.Can someone help me edit it? Thanks
My script :
import psycopg2, sqlite3, sys import time import threading sqdb="C://Users//duongnb//Desktop//Python//SqliteToPostgreFull//testmydb6.db" sqlike="table" pgdb="testmydb13" pguser="postgres" pgpswd="1234" pghost="127.0.0.1" pgport="5432" consq=sqlite3.connect(sqdb) cursq=consq.cursor() tabnames=[] cursq.execute('''SELECT name FROM sqlite_master WHERE type="table" AND name LIKE "'''+sqlike+'''%";''') tabgrab = cursq.fetchall() for item in tabgrab: tabnames.append(item[0]) print(tabgrab) def copyTable(table): cursq.execute("SELECT sql FROM sqlite_master WHERE type='table' AND name = ?;", (table,)) create = cursq.fetchone()[0] cursq.execute("SELECT * FROM %s;" %table) rows=cursq.fetchall() colcount=len(rows[0]) pholder='%s,'*colcount newholder=pholder[:-1] try: conpg = psycopg2.connect(database=pgdb, user=pguser, password=pgpswd, host=pghost, port=pgport) curpg = conpg.cursor() curpg.execute("DROP TABLE IF EXISTS %s;" %table) create = create.replace("AUTOINCREMENT", "") curpg.execute(create) curpg.executemany("INSERT INTO %s VALUES (%s);" % (table, newholder),rows) conpg.commit() if conpg: conpg.close() except psycopg2.DatabaseError as e: print ('Error %s' % e) sys.exit(1) finally: print("Complete") consq.close() if __name__ == "__main__": start_time = time.time() for table in tabnames: p = threading.Thread(target = copyTable, args = (table,)) p.start() for table in tabnames: p.join() duration = time.time() - start_time print("Duration {duration} seconds ")My error:
Error:Microsoft Windows [Version 10.0.18362.535]
(c) 2019 Microsoft Corporation. All rights reserved.
(base) C:\Users\duongnb\Desktop\Python>python -u "c:\Users\duongnb\Desktop\Python\SqliteToPostgreFull\MigrateThreading.py"
[('table1',), ('table2',), ('table3',), ('table4',), ('table5',), ('table6',), ('table7',), ('table8',), ('table9',), ('table10',)]
[('table1',), ('table2',), ('table3',), ('table4',), ('table5',), ('table6',), ('table7',), ('table8',), ('table9',), ('table10',)]
[('table1',), ('table2',), ('table3',), ('table4',), ('table5',), ('table6',), ('table7',), ('table8',), ('table9',), ('table10',)]
[('table1',), ('table2',), ('table3',), ('table4',), ('table5',), ('table6',), ('table7',), ('table8',), ('table9',), ('table10',)]
[('table1',), ('table2',), ('table3',), ('table4',), ('table5',), ('table6',), ('table7',), ('table8',), ('table9',), ('table10',)]
[('table1',), ('table2',), ('table3',), ('table4',), ('table5',), ('table6',), ('table7',), ('table8',), ('table9',), ('table10',)]
[('table1',), ('table2',), ('table3',), ('table4',), ('table5',), ('table6',), ('table7',), ('table8',), ('table9',), ('table10',)]
[('table1',), ('table2',), ('table3',), ('table4',), ('table5',), ('table6',), ('table7',), ('table8',), ('table9',), ('table10',)]
[('table1',), ('table2',), ('table3',), ('table4',), ('table5',), ('table6',), ('table7',), ('table8',), ('table9',), ('table10',)]
[('table1',), ('table2',), ('table3',), ('table4',), ('table5',), ('table6',), ('table7',), ('table8',), ('table9',), ('table10',)]
Exception in thread Thread-1:
Traceback (most recent call last):
File "C:\Users\duongnb\AppData\Local\Continuum\anaconda3\lib\threading.py", line 926, in _bootstrap_inner
self.run()
File "C:\Users\duongnb\AppData\Local\Continuum\anaconda3\lib\threading.py", line 870, in run
self._target(*self._args, **self._kwargs)
File "c:\Users\duongnb\Desktop\Python\SqliteToPostgreFull\MigrateThreading.py", line 25, in copyTable
cursq.execute("SELECT sql FROM sqlite_master WHERE type='table' AND name = ?;", (table,))
sqlite3.ProgrammingError: SQLite objects created in a thread can only be used in that same thread. The object was created in thread id 6924 and this is thread id 12180.
Exception in thread Thread-4:
Traceback (most recent call last):
File "C:\Users\duongnb\AppData\Local\Continuum\anaconda3\lib\threading.py", line 926, in _bootstrap_inner
self.run()
File "C:\Users\duongnb\AppData\Local\Continuum\anaconda3\lib\threading.py", line 870, in run
self._target(*self._args, **self._kwargs)
File "c:\Users\duongnb\Desktop\Python\SqliteToPostgreFull\MigrateThreading.py", line 25, in copyTable
cursq.execute("SELECT sql FROM sqlite_master WHERE type='table' AND name = ?;", (table,))
sqlite3.ProgrammingError: SQLite objects created in a thread can only be used in that same thread. The object was created in thread id 6924 and this is thread id 8240.
Exception in thread Thread-3:
Traceback (most recent call last):
File "C:\Users\duongnb\AppData\Local\Continuum\anaconda3\lib\threading.py", line 926, in _bootstrap_inner
self.run()
File "C:\Users\duongnb\AppData\Local\Continuum\anaconda3\lib\threading.py", line 870, in run
self._target(*self._args, **self._kwargs)
File "c:\Users\duongnb\Desktop\Python\SqliteToPostgreFull\MigrateThreading.py", line 25, in copyTable
cursq.execute("SELECT sql FROM sqlite_master WHERE type='table' AND name = ?;", (table,))
sqlite3.ProgrammingError: SQLite objects created in a thread can only be used in that same thread. The object was created in thread id 6924 and this is thread id 228.
Exception in thread Thread-2:
Traceback (most recent call last):
File "C:\Users\duongnb\AppData\Local\Continuum\anaconda3\lib\threading.py", line 926, in _bootstrap_inner
self.run()
File "C:\Users\duongnb\AppData\Local\Continuum\anaconda3\lib\threading.py", line 870, in run
self._target(*self._args, **self._kwargs)
File "c:\Users\duongnb\Desktop\Python\SqliteToPostgreFull\MigrateThreading.py", line 25, in copyTable
cursq.execute("SELECT sql FROM sqlite_master WHERE type='table' AND name = ?;", (table,))
sqlite3.ProgrammingError: SQLite objects created in a thread can only be used in that same thread. The object was created in thread id 6924 and this is thread id 8852.
Exception in thread Thread-6:
Traceback (most recent call last):
File "C:\Users\duongnb\AppData\Local\Continuum\anaconda3\lib\threading.py", line 926, in _bootstrap_inner
self.run()
File "C:\Users\duongnb\AppData\Local\Continuum\anaconda3\lib\threading.py", line 870, in run
self._target(*self._args, **self._kwargs)
File "c:\Users\duongnb\Desktop\Python\SqliteToPostgreFull\MigrateThreading.py", line 25, in copyTable
cursq.execute("SELECT sql FROM sqlite_master WHERE type='table' AND name = ?;", (table,))
sqlite3.ProgrammingError: SQLite objects created in a thread can only be used in that same thread. The object was created in thread id 6924 and this is thread id 9344.
Exception in thread Thread-7:
Traceback (most recent call last):
File "C:\Users\duongnb\AppData\Local\Continuum\anaconda3\lib\threading.py", line 926, in _bootstrap_inner
self.run()
File "C:\Users\duongnb\AppData\Local\Continuum\anaconda3\lib\threading.py", line 870, in run
self._target(*self._args, **self._kwargs)
File "c:\Users\duongnb\Desktop\Python\SqliteToPostgreFull\MigrateThreading.py", line 25, in copyTable
cursq.execute("SELECT sql FROM sqlite_master WHERE type='table' AND name = ?;", (table,))
sqlite3.ProgrammingError: SQLite objects created in a thread can only be used in that same thread. The object was created in thread id 6924 and this is thread id 6104.
Exception in thread Thread-8:
Traceback (most recent call last):
File "C:\Users\duongnb\AppData\Local\Continuum\anaconda3\lib\threading.py", line 926, in _bootstrap_inner
self.run()
File "C:\Users\duongnb\AppData\Local\Continuum\anaconda3\lib\threading.py", line 870, in run
self._target(*self._args, **self._kwargs)
File "c:\Users\duongnb\Desktop\Python\SqliteToPostgreFull\MigrateThreading.py", line 25, in copyTable
cursq.execute("SELECT sql FROM sqlite_master WHERE type='table' AND name = ?;", (table,))
sqlite3.ProgrammingError: SQLite objects created in a thread can only be used in that same thread. The object was created in thread id 6924 and this is thread id 2516.
Exception in thread Thread-10:
Traceback (most recent call last):
File "C:\Users\duongnb\AppData\Local\Continuum\anaconda3\lib\threading.py", line 926, in _bootstrap_inner
self.run()
File "C:\Users\duongnb\AppData\Local\Continuum\anaconda3\lib\threading.py", line 870, in run
self._target(*self._args, **self._kwargs)
File "c:\Users\duongnb\Desktop\Python\SqliteToPostgreFull\MigrateThreading.py", line 25, in copyTable
cursq.execute("SELECT sql FROM sqlite_master WHERE type='table' AND name = ?;", (table,))
sqlite3.ProgrammingError: SQLite objects created in a thread can only be used in that same thread. The object was created in thread id 6924 and this is thread id 1912.
Exception in thread Thread-9:
Traceback (most recent call last):
File "C:\Users\duongnb\AppData\Local\Continuum\anaconda3\lib\threading.py", line 926, in _bootstrap_inner
self.run()
File "C:\Users\duongnb\AppData\Local\Continuum\anaconda3\lib\threading.py", line 870, in run
self._target(*self._args, **self._kwargs)
File "c:\Users\duongnb\Desktop\Python\SqliteToPostgreFull\MigrateThreading.py", line 25, in copyTable
cursq.execute("SELECT sql FROM sqlite_master WHERE type='table' AND name = ?;", (table,))
sqlite3.ProgrammingError: SQLite objects created in a thread can only be used in that same thread. The object was created in thread id 6924 and this is thread id 3152.
Duration {duration} seconds
Exception in thread Thread-5:
Traceback (most recent call last):
File "C:\Users\duongnb\AppData\Local\Continuum\anaconda3\lib\threading.py", line 926, in _bootstrap_inner
self.run()
File "C:\Users\duongnb\AppData\Local\Continuum\anaconda3\lib\threading.py", line 870, in run
self._target(*self._args, **self._kwargs)
File "c:\Users\duongnb\Desktop\Python\SqliteToPostgreFull\MigrateThreading.py", line 25, in copyTable
cursq.execute("SELECT sql FROM sqlite_master WHERE type='table' AND name = ?;", (table,))
sqlite3.ProgrammingError: SQLite objects created in a thread can only be used in that same thread. The object was created in thread id 6924 and this is thread id 10416.