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Mysql.py
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198 lines (174 loc) · 5.07 KB
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#!/usr/bin/python
# by tianming 2013-06-26
import MySQLdb
import Logger
import Thread
import threading
#used conf keys:
# db_pool_size
# db_host
# db_user
# db_pass
# db_name
# db_charset
class Mysql:
def __init__(self, conn, logger = None):
self._conn = conn
self._cursor = conn.cursor()
if logger:
self._logger = logger
else:
self._logger = None
def __del__(self):
self._cursor.close()
self._conn.close()
def execute(self, sql):
try:
if self._cursor:
self._cursor.execute(sql)
return self._cursor.rowcount
else:
if self._logger:
self._logger.error("_cursor not init!!!")
return -1
except Exception,e:
print Exception,":",e
if self._logger:
self._logger.error("failed to execute %s" %sql)
def results(self):
if self._cursor.rowcount > 0:
return self._cursor.fetchall()
else:
return None
#singleton
class MysqlPool:
def __init__(self, conf_items, logger = None):
auto_lock = Thread.AutoLock(self._lock)
#if len(self._conf_items) > 0:
# pass
#else:
self._conf_items = {}
self._lock = threading.RLock()
self._logger = None
self._mysql_pool = {}
self._default_db_pool_size = 5
self._default_db_host = "localhost"
self._default_db_user = "root"
self._default_db_pass = "sd-9898w"
self._default_db_name = "test"
self._default_db_charset = "utf8"
self._IN_USE = 1
self._NOT_IN_USE = 0
self._has_init = 0
self._conf_items = conf_items.copy()
if logger:
self._logger = logger
#init pool
if "db_pool_size" in self._conf_items.keys():
self._default_db_pool_size = int(self._conf_items["db_pool_size"])
if "db_host" in self._conf_items.keys():
self._default_db_host = self._conf_items["db_host"]
if "db_user" in self._conf_items.keys():
self._default_db_user = self._conf_items["db_user"]
if "db_pass" in self._conf_items.keys():
self._default_db_pass = self._conf_items["db_pass"]
if "db_name" in self._conf_items.keys():
self._default_db_name = self._conf_items["db_name"]
if "db_charset" in self._conf_items.keys():
self._default_db_charset = self._conf_items["db_charset"]
i = 0
while i < self._default_db_pool_size:
try:
conn = MySQLdb.connect(host='%s' %self._default_db_host, user='%s' %self._default_db_user, passwd='%s' %self._default_db_pass, db='%s' %self._default_db_name, charset='%s' %self._default_db_charset)
self._mysql_pool[Mysql(conn, self._logger)] = self._NOT_IN_USE
i += 1
except Exception,e:
print Exception,":",e
if self._logger:
self._logger.error("failed to connect for host=%s,user=%s,pass=%s,db_name=%s,charset=%s" %(self._default_db_host, self._default_db_user, self._default_db_pass, self._default_db_name, self._default_db_charset))
break
def __del__(self):
pass
def get_sql(self, create_when_need = 0):
auto_lock = Thread.AutoLock(self._lock)
if len(self._mysql_pool) == 0:
if self._logger:
self._logger.error("len(_mysql_pool) == 0,why?")
return None
for key, value in self._mysql_pool.items():
if value == self._NOT_IN_USE:
self._mysql_pool[key] = self._IN_USE
return key
if create_when_need == 1:
conn = MySQLdb.connect(self._default_db_host, self._default_db_user, self._default_db_pass, self._default_db_name, self._default_db_charset)
obj = Mysql(conn, self._logger)
self._mysql_pool[obj] = self._IN_USE
return obj
else:
return None
def release_sql(self, obj):
auto_lock = Thread.AutoLock(self._lock)
if obj in self._mysql_pool.keys():
self._mysql_pool[obj] = self._NOT_IN_USE
else:
pass
'''
_conf_items = {}
_lock = threading.RLock()
_logger = None
_mysql_pool = {}
_default_db_pool_size = 5
_default_db_host = "localhost"
_default_db_user = "root"
_default_db_pass = "sd-9898w"
_default_db_name = "test"
_default_db_charset = "utf8"
_IN_USE = 1
_NOT_IN_USE = 0
_has_init = 0
'''
#for debug and example
if __name__ == "__main__":
g_logger = Logger.Logger("./log.conf")
conf = {"db_pool_size":"5"}
g_mysqlPool = MysqlPool(conf, g_logger)
i = 0
while i < 11:
i += 1
table_name = "test%d" %i
print "g_mysqlPool.get_sql()..."
obj = g_mysqlPool.get_sql()
sql = "drop table if exists %s" %table_name
line = obj.execute(sql)
if line >= 0:
print "succeed to execute %s" %sql
else:
print "failed to execute %s" %sql
exit
sql = "create table if not exists %s(name varchar(20) not null default '')" %table_name
line = obj.execute(sql)
if line >= 0:
print "succeed to execute %s" %sql
else:
print "failed to execute %s" %sql
exit
sql = "insert into %s(name) values('tianming1'),('tianming2')" %table_name
line = obj.execute(sql)
if line >= 0:
print "succeed to execute %s" %sql
else:
print "failed to execute %s" %sql
exit
sql = "select * from %s" %table_name
line = obj.execute(sql)
if line >= 0:
print "succeed to execute %s" %sql
else:
print "failed to execute %s" %sql
exit
for line in obj.results():
print '%s' %line
print "g_mysqlPool.release_sql()..."
g_mysqlPool.release_sql(obj)
else:
pass