我们通过代码查看了方法。
DataError DatabaseError Error IntegrityError InterfaceError InternalError NotSupportedError OperationalError ProgrammingError Warning affected_rows autocommit autocommit_mode begin bind_address character_set_name charset client_flag close commit connect connect_timeout cursor cursorclass db decoders encoders encoding escape escape_string get_autocommit get_host_info get_proto_info get_server_info host host_info init_command insert_id kill literal max_allowed_packet next_result open password ping port protocol_version query rollback salt select_db server_capabilities server_charset server_language server_status server_thread_id server_version set_charset show_warnings sql_mode ssl thread_id unix_socket use_unicode user write_packet
close函数
def close(self):
"""
Send the quit message and close the socket.
See `Connection.close() <https://www.python.org/dev/peps/pep-0249/#Connection.close>`_
in the specification.
:raise Error: If the connection is already closed.
"""
翻译：发送退出信息并且关闭套接字。如果连接已经关闭就会抛出异常。多次关闭或者异常关闭了。
open函数
@property
def open(self):
"""Return True if the connection is open"""
return self._sock is not None
翻译：如果连接是开启状态就会返回Ture，反之亦然。
begin函数
def begin(self): """Begin transaction."""
翻译：无返回值，开启事务。
commit函数
def commit(self): """ Commit changes to stable storage. See `Connection.commit() <https://www.python.org/dev/peps/pep-0249/#commit>`_ in the specification. """
翻译：将变化后的数据存储到内存中，帮助文档。
rollback函数
def rollback(self): """ Roll back the current transaction. See `Connection.rollback() <https://www.python.org/dev/peps/pep-0249/#rollback>`_ in the specification. """
翻译：回滚当前的事务，rollback帮助文档。
show_warnings函数
def show_warnings(self): """Send the "SHOW WARNINGS" SQL command.""" self._execute_command(COMMAND.COM_QUERY, "SHOW WARNINGS") result = MySQLResult(self) result.read() return result.rows
翻译：发送show_warnings指令，将得到的结果返回回来。
literal函数
def literal(self, obj): """Alias for escape() Non-standard, for internal use; do not use this in your applications. """ return self.escape(obj, self.encoders)
翻译：escape的别名
cursor函数
def cursor(self, cursor=None): """ Create a new cursor to execute queries with. :param cursor: The type of cursor to create; one of :py:class:`Cursor`, :py:class:`SSCursor`, :py:class:`DictCursor`, or :py:class:`SSDictCursor`. None means use Cursor. """ if cursor: return cursor(self) return self.cursorclass(self)
翻译：为查询结果建立一个游标，参数cursor：表示将要游标创建的类型。有如下几种Cursor默认。
SSCursor,DictCursor,或者SSDictCursor.这些都在pymysql.cursor里面有定义。
query函数
# The following methods are INTERNAL USE ONLY (called from Cursor)
def query(self, sql, unbuffered=False):
# if DEBUG:
# print("DEBUG: sending query:", sql)
if isinstance(sql, text_type) and not (JYTHON or IRONPYTHON):
if PY2:
sql = sql.encode(self.encoding)
else:
sql = sql.encode(self.encoding, 'surrogateescape')
self._execute_command(COMMAND.COM_QUERY, sql)
self._affected_rows = self._read_query_result(unbuffered=unbuffered)
return self._affected_rows
翻译：这个方法是用来做查询的，返回的结果是影响的行数。
try:
db = pymysql.connect(host="127.0.0.1",user="root",port=3306,password="123456",database="android")
print(type(db.query("show tables")))
db.close()
print("连接成功")
except:
print("连接失败")
<class 'int'> 连接成功
next_result函数
def next_result(self, unbuffered=False): self._affected_rows = self._read_query_result(unbuffered=unbuffered) return self._affected_rows
翻译：获取查询结果，返回是行数。
affected_rows函数
def affected_rows(self): return self._affected_rows
翻译：返回影响的行数。
ping函数
def ping(self, reconnect=True):
"""
Check if the server is alive.
:param reconnect: If the connection is closed, reconnect.
:raise Error: If the connection is closed and reconnect=False.
"""
if self._sock is None:
if reconnect:
self.connect()
reconnect = False
else:
raise err.Error("Already closed")
try:
self._execute_command(COMMAND.COM_PING, "")
self._read_ok_packet()
except Exception:
if reconnect:
self.connect()
self.ping(False)
else:
raise
翻译：检测主机是否存活，默认重新连接。如果当前的sock为None且非重连模式，则会抛出异常。然后进行查询。
cursor函数
def cursor(self, cursor=None): """ Create a new cursor to execute queries with. :param cursor: The type of cursor to create; one of :py:class:`Cursor`, :py:class:`SSCursor`, :py:class:`DictCursor`, or :py:class:`SSDictCursor`. None means use Cursor. """ if cursor: return cursor(self) return self.cursorclass(self)
翻译：
set_charset函数
def set_charset(self, charset): # Make sure charset is supported. encoding = charset_by_name(charset).encoding self._execute_command(COMMAND.COM_QUERY, "SET NAMES %s" % self.escape(charset)) self._read_packet() self.charset = charset self.encoding = encoding
翻译：首先确保支持charset，设置字符集。设置解码格式。