使用Python操作MySQL数据库的时候常使用MySQLdb这个模块。在开发的过程发现MySQLdb.connect有些参数没法设置。通过这个页面我们看到的是在connect的时候，可以设置的option和client_flags和MySQLcapi相比差不少。下面小编来讲解下如何给Python的MySQL模块加功能?

　　如何给Python的MySQL模块加功能

　　一个很重要的参数MYSQL_OPT_READ_TIMEOUT没法设置，这个参数如果不设置，极致状况MySQL处于hang住，自动切换IP漂移，客户端无法重连到新MySQL。

　　给MySQLdb加Option很简单，只要修改_mysql.c这个把Python对象映射到MySQL操作的文件，添加参数，再加一段mysql_option即可。

　　下面是修改后的gitdiff文件

diff--gita/_mysql.cb/_mysql.cindexd42cc54..61a9b34100644---a/_mysql.c+++b/_mysql.c@@-489,9+489,10@@_mysql_ConnectionObject_Initialize("named_pipe","init_command","read_default_file","read_default_group","client_flag","ssl",-"local_infile",+"local_infile","read_timeout",NULL};intconnect_timeout=0;+intread_timeout=0;intcompress=-1,named_pipe=-1,local_infile=-1;char*init_command=NULL,*read_default_file=NULL,@@-500,7+501,7@@_mysql_ConnectionObject_Initialize(self->converter=NULL;self->open=0;check_server_init(-1);-if(!PyArg_ParseTupleAndKeywords(args,kwargs,"|ssssisOiiisssiOi:connect",+if(!PyArg_ParseTupleAndKeywords(args,kwargs,"|ssssisOiiisssiOii:connect",kwlist,&host,&user,&passwd,&db,&port,&unix_socket,&conv,@@-509,7+510,8@@_mysql_ConnectionObject_Initialize(&init_command,&read_default_file,&read_default_group,&client_flag,&ssl,-&local_infile/*DONOTPATCHFORRECONNECT,IDIOTS+&local_infile,&read_timeout+/*DONOTPATCHFORRECONNECT,IDIOTSIFYOUDOTHIS,IWILLNOTSUPPORTYOURPACKAGES.*/))return-1;@@-540,6+542,12@@_mysql_ConnectionObject_Initialize(mysql_options(&(self->connection),MYSQL_OPT_CONNECT_TIMEOUT,(char*)&timeout);}++if(read_timeout){+unsignedinttimeout=read_timeout;+mysql_options(&(self->connection),MYSQL_OPT_READ_TIMEOUT,(char*)&timeout);+}+if(compress!=-1){mysql_options(&(self->connection),MYSQL_OPT_COMPRESS,0);client_flag|=CLIENT_COMPRESS;

　　代码修改完毕，pythonsetup.pyinstall即可，如果出现mysql_config找不到的问题。你还要修改setup_posix.py文件。

hoterran@hoterran-laptop:~/Projects/MySQL-python-1.2.3$gitdiffsetup_posix.pydiff--gita/setup_posix.pyb/setup_posix.pyindex86432f5..f4f08f1100644---a/setup_posix.py+++b/setup_posix.py@@-23,7+23,7@@defmysql_config(what):ifret/256>1:raiseEnvironmentError("%snotfound"%(mysql_config.path,))returndata-mysql_config.path="mysql_config"+mysql_config.path="/usr/local/mysql/bin/mysql_config"defget_config():importos,sys

　　如何给Python的MySQL模块加功能

　　编译通过，我们来试试添加的read_timeout这个参数。

conn=MySQLdb.connect(host=DB_SERVER,user=DB_USERNAME,passwd=DB_PASSWORD,db=DB_NAME,port=int(DB_PORT),client_flag=2,read_timeout=10)

　　然后执行语句前，你试着把mysql用gdbhang住10s后，python就会异常抛错

OperationalError:(2013,'LostconnectiontoMySQLserverduringquery')>/home/hoterran/Projects/dbaas/trunk/dbtest.py(18)()>mydb.execute_sql(conn,sql)(Pdb)--Return-->/home/hoterran/Projects/dbaas/trunk/dbtest.py(18)()->None>mydb.execute_sql(conn,sql)(Pdb)OperationalError:(2013,'LostconnectiontoMySQLserverduringquery')>(1)()->None