SQLUtil.py
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# coding=utf-8
#author: 4N
#createtime: 2021/6/29
#email: nheweijun@sina.com
class SQLUtil:
@classmethod
def get_table_count(cls,table_name,db_session):
count_result = db_session.execute('''SELECT reltuples::bigint AS ec FROM pg_class WHERE oid = 'public."{}"'::regclass'''.format(
table_name)).fetchone()
count = count_result[0]
if count< 1000000:
count_result = db_session.execute('select count(*) from "{}"'.format(table_name)).fetchone()
count=count_result[0]
return count
@classmethod
def rename(cls,session,origin,after_name):
rename_sql = 'alter table "{}" rename to "{}"'.format(origin, after_name)
session.execute(rename_sql)
session.commit()
@classmethod
def check_table_privilege(cls,table_name,pri_type,user,session):
'''
判断用户是否对表具有权限
:param table_name:
:param pri_type:
:param user:
:param pg_ds:
:return:
'''
pri = session.execute("select * from information_schema.table_privileges "
"where grantee='{}' and table_name='{}' and privilege_type='{}' "
.format(user,table_name,pri_type)).fetchall()
if len(pri) == 1:
return True
else:
return False
@classmethod
def check_database_privilege(cls,table_name,pri_type,user,session):
pass
@classmethod
def check_database_privilege_pg(cls,table_name,pri_type,user,session):
pass