【发布时间】：2021-06-30 23:17:41
【问题描述】：
我正在尝试运行一个连接到 postrgres 数据库的程序，运行一个查询并将这个结果保存在一个 Excel 电子表格中。
我面临的问题是在我运行查询时。 “memberof”列的结果有一个空的 {}。
rolname | rolsuper | rolinherit | rolcreaterole | rolcreatedb | rolcanlogin | rolconnlimit | rolvaliduntil | memberof | rolreplication | rolbypassrls
------------+----------+------------+---------------+-------------+-------------+--------------+---------------+----------+----------------+--------------
joe | f | t | f | f | t | -1 | | {} | f | f
postgres | t | t | t | t | t | -1 | | {} | t | t
test_joe | f | t | f | f | t | -1 | | {} | f | f
因此，我的代码返回此错误输出。
Traceback (most recent call last):
File "/path/to/file.py", line 55, in <module>
GetPostgresqlData()
File "/path/to/file.py", line 52, in GetPostgresqlData
ws.append(row)
File "/path/to/.local/lib/python3.9/site-packages/openpyxl/worksheet/worksheet.py", line 665, in append
cell = Cell(self, row=row_idx, column=col_idx, value=content)
File "/path/to/.local/lib/python3.9/site-packages/openpyxl/cell/cell.py", line 116, in __init__
self.value = value
File "/path/to/.local/lib/python3.9/site-packages/openpyxl/cell/cell.py", line 215, in value
self._bind_value(value)
File "/path/to/.local/lib/python3.9/site-packages/openpyxl/cell/cell.py", line 184, in _bind_value
raise ValueError("Cannot convert {0!r} to Excel".format(value))
ValueError: Cannot convert [] to Excel
我应该怎么做才能将这一列和其他列的结果写入excel电子表格？
这是我针对我的测试数据库运行的查询。
SELECT r.rolname, r.rolsuper, r.rolinherit,
r.rolcreaterole, r.rolcreatedb, r.rolcanlogin,
r.rolconnlimit, r.rolvaliduntil,
ARRAY(SELECT b.rolname
FROM pg_catalog.pg_auth_members m
JOIN pg_catalog.pg_roles b ON (m.roleid = b.oid)
WHERE m.member = r.oid) as memberof
, r.rolreplication
, r.rolbypassrls
FROM pg_catalog.pg_roles r
WHERE r.rolname !~ '^pg_'
ORDER BY 1;
这是我的代码。
def GetPostgresqlData():
wb = Workbook()
wb.remove(wb['Sheet'])
ws = wb.create_sheet(0)
ws.title = 'Titulo 01'
hosts = open('serverlist.csv', 'r')
hosts = hosts.readlines()[1:]
for i in range(len(filequery[1:])):
with open(filequery[i+1], 'r') as postgresql_query:
query = postgresql_query.read()
for row in hosts:
command_Array = row.strip('\n').split(',')
db_host = command_Array[0]
db_port = command_Array[1]
db_name = command_Array[2]
db_user = command_Array[3]
db_password = command_Array[4]
postgresql_connection = psycopg2.connect(user=db_user,
password=db_password,
host=db_host,
port=db_port,
database=db_name)
cursor = postgresql_connection.cursor()
cursor.execute(query)
colnames = [desc[0] for desc in cursor.description]
records = cursor.fetchall()
ws.append(colnames)
for row in records:
ws.append(row)
wb.save("postgresql.xlsx")
GetPostgresqlData()
【问题讨论】：
-
例外情况不言自明：您不能将列表保存到单个单元格中。请提供您正在使用的相关 Python 代码：SQL 查询本身不相关。
-
感谢查理的回答。我编辑了我的帖子并添加了我的代码。
-
因此，您现在应该调试代码以查看查询返回的行之一的样子。顺便提一句。检查代码的缩进，因为它看起来有点奇怪。
标签： python python-3.x excel postgresql openpyxl