我在python中编写了一个web.py服务来访问PostGres并获取特定数据库中的表名。
CODE:
def GET(self,r):
web.header('Access-Control-Allow-Origin', '*')
web.header('Access-Control-Allow-Credentials', 'true')
tables = []
datasetID = web.input().dataSetID
cursor = conn.cursor()
cursor.execute("select relname from pg_class where relkind='r' and relname !~ '^(pg_|sql_)';")
tablesWithDetails = cursor.fetchall()
print tablesWithDetails
for x in tablesWithDetails:
x.replace("(", "")
x.replace(")","")
tables.append(x)
print tables;
这将打印表格如下,
[('acam_datasegregationdetails',), ('acam_datasegregationheader',), ('idn_accessinformation',), ('idn_b2cuseraccountmapping',), ('idn_b2cuserdevicemapping',), ('idn_b2cusers',), ('idn_roles',), ('idn_useraccountmapping')]
需要输出:
['acam_datasegregationdetails', 'acam_datasegregationheader', idn_accessinformation', 'idn_b2cuseraccountmapping', 'idn_b2cuserdevicemapping', 'idn_b2cusers', 'idn_roles', 'idn_useraccountmapping']
答案 0 :(得分:4)
删除该循环而改为
tables = [t[0] for t in tablesWithDetails]
它将构建一个包含结果集中每个元组的第一个元素的列表。
甚至更简单(也更便宜),如果你想要一个列表然后返回一个数组,它将被Psycopg改编成一个列表:
cursor.execute("""
select array_agg(relname)
from pg_class
where relkind='r' and relname !~ '^(pg_|sql_)';"
""")
tables = cursor.fetchall()[0][0]