Python extensions.ISOLATION_LEVEL_REPEATABLE_READ属性代码示例

# 需要导入模块: from psycopg2 import extensions [as 别名]
# 或者: from psycopg2.extensions import ISOLATION_LEVEL_REPEATABLE_READ [as 别名]
def main():
    """The main program"""
    args = parse_args()
    items = []
    now = str(int(time()))

    with connect(database=args.dbname) as conn:
        conn.set_session(
            isolation_level=ISOLATION_LEVEL_REPEATABLE_READ,
            readonly=True,
        )

        for query in args.queries:
            rows = execute(conn, query)
            if len(rows) == 0:
                raise Exception('No result')
            items.extend(
                get_row_data(args.key_column, rows) if args.key_column
                else get_column_data(rows)
            )

    for key, value in items:
        print(args.prefix + '.' + key, value, now) 

# 需要导入模块: from psycopg2 import extensions [as 别名]
# 或者: from psycopg2.extensions import ISOLATION_LEVEL_REPEATABLE_READ [as 别名]
def _isolation_lookup(self):
        extensions = self._psycopg2_extensions()
        return {
            'AUTOCOMMIT': extensions.ISOLATION_LEVEL_AUTOCOMMIT,
            'READ COMMITTED': extensions.ISOLATION_LEVEL_READ_COMMITTED,
            'READ UNCOMMITTED': extensions.ISOLATION_LEVEL_READ_UNCOMMITTED,
            'REPEATABLE READ': extensions.ISOLATION_LEVEL_REPEATABLE_READ,
            'SERIALIZABLE': extensions.ISOLATION_LEVEL_SERIALIZABLE
        } 

# 需要导入模块: from psycopg2 import extensions [as 别名]
# 或者: from psycopg2.extensions import ISOLATION_LEVEL_REPEATABLE_READ [as 别名]
def _isolation_lookup(self):
        from psycopg2 import extensions
        return {
            'AUTOCOMMIT': extensions.ISOLATION_LEVEL_AUTOCOMMIT,
            'READ COMMITTED': extensions.ISOLATION_LEVEL_READ_COMMITTED,
            'READ UNCOMMITTED': extensions.ISOLATION_LEVEL_READ_UNCOMMITTED,
            'REPEATABLE READ': extensions.ISOLATION_LEVEL_REPEATABLE_READ,
            'SERIALIZABLE': extensions.ISOLATION_LEVEL_SERIALIZABLE
        } 

# 需要导入模块: from psycopg2 import extensions [as 别名]
# 或者: from psycopg2.extensions import ISOLATION_LEVEL_REPEATABLE_READ [as 别名]
def _isolation_lookup(self):
        extensions = self._psycopg2_extensions()
        return {
            "AUTOCOMMIT": extensions.ISOLATION_LEVEL_AUTOCOMMIT,
            "READ COMMITTED": extensions.ISOLATION_LEVEL_READ_COMMITTED,
            "READ UNCOMMITTED": extensions.ISOLATION_LEVEL_READ_UNCOMMITTED,
            "REPEATABLE READ": extensions.ISOLATION_LEVEL_REPEATABLE_READ,
            "SERIALIZABLE": extensions.ISOLATION_LEVEL_SERIALIZABLE,
        } 

# 需要导入模块: from psycopg2 import extensions [as 别名]
# 或者: from psycopg2.extensions import ISOLATION_LEVEL_REPEATABLE_READ [as 别名]
def fix_up_databases(databases):
    """Increase isolation level, use atomic requests.

    Does not modify connections to non-PostgreSQL databases.
    """
    # Remove keys with null values from databases.
    databases.update(
        {
            alias: {
                key: value
                for key, value in database.items()
                if value is not None
            }
            for alias, database in databases.items()
        }
    )
    # Ensure that transactions are configured correctly.
    from psycopg2.extensions import ISOLATION_LEVEL_REPEATABLE_READ

    for _, database in databases.items():
        engine = database.get("ENGINE")
        if engine == "django.db.backends.postgresql_psycopg2":
            options = database.setdefault("OPTIONS", {})
            # Explicitly set the transaction isolation level. MAAS needs a
            # particular transaction isolation level, and it enforces it.
            if "isolation_level" in options:
                isolation_level = options["isolation_level"]
                if isolation_level != ISOLATION_LEVEL_REPEATABLE_READ:
                    warnings.warn(
                        "isolation_level is set to %r; overriding to %r."
                        % (isolation_level, ISOLATION_LEVEL_REPEATABLE_READ),
                        RuntimeWarning,
                        2,
                    )
            options["isolation_level"] = ISOLATION_LEVEL_REPEATABLE_READ
            # Enable ATOMIC_REQUESTS: MAAS manages transactions across the
            # whole request/response lifecycle including middleware (Django,
            # in its infinite wisdom, does not). However we enable this
            # setting to ensure that views run within _savepoints_ so that
            # middleware exception handlers that suppress exceptions don't
            # inadvertently allow failed requests to be committed.
            if "ATOMIC_REQUESTS" in database:
                atomic_requests = database["ATOMIC_REQUESTS"]
                if not atomic_requests:
                    warnings.warn(
                        "ATOMIC_REQUESTS is set to %r; overriding to True."
                        % (atomic_requests,),
                        RuntimeWarning,
                        2,
                    )
            database["ATOMIC_REQUESTS"] = True