class ReplicateTable(object):
def __init__(self):
self.error = ErrorHandling()
self.mysql = MySQLConnector()
self.execute = Execute()
self.table = ConstructReplicationQuery()
def replicate_table(self, db, source_table_name, destination_table_name):
"""
:param db:
:param source_table_name:
:param destination_table_name:
"""
self.error.warn("making TABLE %s, an exact copy of TABLE %s..." % (destination_table_name, source_table_name))
self.error.warn("connecting to DATABASE %s..." % db)
(db_conn, db_cursor, dict_cursor) = self.mysql.db_connect(db)
self.error.warn("cloning structure of table...")
clone_query = self.table.construct_replication_query(db_conn, source_table_name, destination_table_name)
self.execute.execute_(db, db_cursor, clone_query, True)
self.error.warn("populating newly created table, TABLE %s" % destination_table_name)
populate_query = """INSERT INTO " + destination_table_name + " SELECT * FROM """ + source_table_name
self.execute.execute_(db, db_cursor, populate_query, True)
self.error.warn("finished replicating table!")
class QuickExecute(object):
def __init__(self):
self.mysql = MySQLConnector()
self.execute = Execute()
def quick_execute(self, db, query, warn=False):
"""
This method performs the db connect and execute in the same call.
"""
(con, cursor_, dict_cursor) = self.mysql.db_connect(db)
return self.execute.execute_(db, cursor_, query, warn)
class RandomSubset(object):
def __init__(self):
self.mysql = MySQLConnector()
self.error = ErrorHandling()
self.execute_one_col = ExecuteGetListOneColumn()
self.execute = Execute()
def random_subset_table(self, db, source_table_name, destination_table_name, field, percent=.10,
distinct=True):
"""
This method selects a random sample of records from source table to destination table
:param db:
:param source_table_name:
:param destination_table_name:
:param field:
:param percent:
:param distinct:
"""
self.error.warn("making TABLE %s, a %2.2f percent random subset of TABLE %s on unique key %s..." % (
destination_table_name, percent, source_table_name, field))
self.error.warn("connecting to DATABASE %s..." % db)
(db_conn, db_cursor, dict_cursor) = self.mysql.db_connect(db)
self.error.warn("removing destination table if it exists...")
sql = 'DROP TABLE IF EXISTS %s' % destination_table_name
self.execute.execute_(db, db_cursor, sql, True)
self.error.warn("cloning structure of table...")
sql = 'CREATE TABLE %s LIKE %s' % (destination_table_name, source_table_name)
self.execute.execute_(db, db_cursor, sql, True)
is_distinct_text = ' distinct' if distinct else ''
self.error.warn('grabbing a%s subset (%2.6f percent) of the keys on which to base the new table' % (
is_distinct_text, 100 * percent))
sql = 'SELECT DISTINCT(%s) FROM %s' % (field, source_table_name) if distinct else 'SELECT %s FROM %s' % (
field, source_table_name)
unique_key_list = self.execute_one_col.execute_get_list_one_col(db, db_cursor, sql, True)
self.error.warn(str(unique_key_list[1:5]))
new_keys = sample(unique_key_list, int(floor(len(unique_key_list) * percent)))
new_keys = map(str, new_keys)
self.error.warn("populating newly created table, TABLE %s" % destination_table_name)
populate_query = "INSERT INTO %s SELECT * FROM %s WHERE %s IN (%s)" % (
destination_table_name, source_table_name, field, ','.join(new_keys))
self.execute.execute_(db, db_cursor, populate_query, False)
self.error.warn("finished making TABLE %s, a %2.2f percent random subset of TABLE %s on unique key %s!" % (
destination_table_name, percent, source_table_name, field))
def __init__(self):
self.error = ErrorHandling()
self.mysql = MySQLConnector()
self.execute = Execute()
self.table = ConstructReplicationQuery()
def __init__(self):
self.mysql = MySQLConnector()
self.error = ErrorHandling()
self.execute_one_col = ExecuteGetListOneColumn()
self.execute = Execute()
def __init__(self):
self.mysql = MySQLConnector()
self.execute = Execute()
