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PyBitmessage/src/helper_sql.py

101 lines
2.7 KiB

import threading
import Queue
sqlSubmitQueue = Queue.Queue() #SQLITE3 is so thread-unsafe that they won't even let you call it from different threads using your own locks. SQL objects can only be called from one thread.
sqlReturnQueue = Queue.Queue()
sqlLock = threading.Lock()
def sqlQuery(sqlStatement, *args):
sqlLock.acquire()
sqlSubmitQueue.put(sqlStatement)
if args == ():
sqlSubmitQueue.put('')
elif type(args[0]) in [list, tuple]:
sqlSubmitQueue.put(args[0])
else:
sqlSubmitQueue.put(args)
queryreturn, rowcount = sqlReturnQueue.get()
sqlLock.release()
return queryreturn
def sqlExecuteChunked(sqlStatement, idCount, *args):
# SQLITE_MAX_VARIABLE_NUMBER,
# unfortunately getting/setting isn't exposed to python
sqlExecuteChunked.chunkSize = 999
if idCount == 0 or idCount > len(args):
return 0
totalRowCount = 0
with sqlLock:
for i in range(
len(args) - idCount, len(args),
sqlExecuteChunked.chunkSize - (len(args) - idCount)
):
chunk_slice = args[
i:i+sqlExecuteChunked.chunkSize - (len(args) - idCount)
]
sqlSubmitQueue.put(
sqlStatement.format(','.join('?' * len(chunk_slice)))
)
# first static args, and then iterative chunk
sqlSubmitQueue.put(
args[0:len(args)-idCount] + chunk_slice
)
retVal = sqlReturnQueue.get()
totalRowCount += retVal[1]
sqlSubmitQueue.put('commit')
return totalRowCount
def sqlExecute(sqlStatement, *args):
sqlLock.acquire()
sqlSubmitQueue.put(sqlStatement)
if args == ():
sqlSubmitQueue.put('')
else:
sqlSubmitQueue.put(args)
queryreturn, rowcount = sqlReturnQueue.get()
sqlSubmitQueue.put('commit')
sqlLock.release()
return rowcount
def sqlStoredProcedure(procName):
sqlLock.acquire()
sqlSubmitQueue.put(procName)
sqlLock.release()
class SqlBulkExecute:
def __enter__(self):
sqlLock.acquire()
return self
def __exit__(self, type, value, traceback):
sqlSubmitQueue.put('commit')
sqlLock.release()
def execute(self, sqlStatement, *args):
sqlSubmitQueue.put(sqlStatement)
if args == ():
sqlSubmitQueue.put('')
else:
sqlSubmitQueue.put(args)
sqlReturnQueue.get()
def query(self, sqlStatement, *args):
sqlSubmitQueue.put(sqlStatement)
if args == ():
sqlSubmitQueue.put('')
else:
sqlSubmitQueue.put(args)
return sqlReturnQueue.get()