python - Peewee - 如何执行原始查询并将其映射到字典？

Question

我一直在尝试执行原始查询并将其映射到字典。

虽然 execute_sql 不返回列名，但它返回元组。

我使用原始查询，但它返回 None Abc 实例

class Abc(BaseModel):
    name = CharField()
    engine = CharField()

q = Abc.raw('show table status from ' + config.DB['name'])
print(list(q.execute()))

输出:

[<Abc: None>, <Abc: None>, <Abc: None>, <Abc: None>, <Abc: None>, <Abc: None>, <Abc: None>, <Abc: None>, <Abc: None>, <Abc: None>, <Abc: None>, <Abc: None>, <Abc: None>, <Abc: None>, <Abc: None>]

sql的结果

Answer 1

也许有更好的方法，但是使用 execute_sql 和 cursor.description 以及列名，我可以为所有表创建包含字典的列表

import peewee

db = peewee.MySQLDatabase('my_database', user='my_user' password='my_password')

cursor = db.execute_sql('show table status from my_database')

all_tables = []

for row in cursor.fetchall():
    table = dict()

    for column, value in zip(cursor.description, row):
        column_name = column[0]
        print(column_name, '=', value)
        table[column_name] = value

    all_tables.append(table)

print(all_tables)    

我的数据库之一的结果:

[
 {'Name': 'alembic_version', 'Engine': 'InnoDB', 'Version': 10, 'Row_format': 'Dynamic', 'Rows': 0, 'Avg_row_length': 0, 'Data_length': 16384, 'Max_data_length': 0, 'Index_length': 0, 'Data_free': 0, 'Auto_increment': None, 'Create_time': datetime.datetime(2019, 4, 29, 17, 19), 'Update_time': None, 'Check_time': None, 'Collation': 'latin1_swedish_ci', 'Checksum': None, 'Create_options': '', 'Comment': ''}, 
 {'Name': 'users', 'Engine': 'InnoDB', 'Version': 10, 'Row_format': 'Dynamic', 'Rows': 0, 'Avg_row_length': 0, 'Data_length': 16384, 'Max_data_length': 0, 'Index_length': 65536, 'Data_free': 0, 'Auto_increment': 2, 'Create_time': datetime.datetime(2019, 4, 29, 17, 19), 'Update_time': None, 'Check_time': None, 'Collation': 'latin1_swedish_ci', 'Checksum': None, 'Create_options': '', 'Comment': ''}, 
 {'Name': 'woocommerce', 'Engine': 'InnoDB', 'Version': 10, 'Row_format': 'Dynamic', 'Rows': 0, 'Avg_row_length': 0, 'Data_length': 16384, 'Max_data_length': 0, 'Index_length': 16384, 'Data_free': 0, 'Auto_increment': 3, 'Create_time': datetime.datetime(2019, 4, 29, 17, 19), 'Update_time': None, 'Check_time': None, 'Collation': 'latin1_swedish_ci', 'Checksum': None, 'Create_options': '', 'Comment': ''}
]

<小时/>

编辑:相同，但具有列表理解

import peewee

db = peewee.MySQLDatabase('my_database', user='my_user' password='my_password')

cursor = db.execute_sql('show table status from my_database')

column_names = [x[0] for x in cursor.description]
all_tables = [dict(zip(column_names, row)) for row in cursor.fetchall()]

print(all_tables)