如何将python变量的值存储在数据库中的phpMyAdmin中？

Question

我创建了一个名为“坐标”的python列表变量。坐标列表由图中随机点的X轴和Y轴值对组成。一对中的第一个值表示X轴值，第二个值表示Y轴值。坐标列表变量如下所示。

coordinates = [(95, 171), (54, 131), (125, 131), (213, 78)]

我实现了一个名为'direction_finder'的函数，通过使用坐标列表变量中的X轴值和Y轴值来查找基本方向。

函数的实现步骤如下

1.访问坐标列表变量中每对中的X轴值。

 x1 = coordinates[0][0]
 x2 = coordinates[1][0]
 x3 = coordinates[2][0]
 x4 = coordinates[3][0]

2.访问坐标列表变量中每对Y轴值。

 y1 = coordinates[0][1]
 y2 = coordinates[1][1]
 y3 = coordinates[2][1]
 y4 = coordinates[3][1]

3.取X轴和Y轴值的度数的值。

degrees_x1y1 = math.atan2(x1,y1)/math.pi* 180
degrees_x2y2 = math.atan2(x2,y2)/math.pi* 180
degrees_x3y3 = math.atan2(x3,y3)/math.pi* 180
degrees_x4y4 = math.atan2(x4,y4)/math.pi* 180

4，加一个if条件，取最终度值。

if degrees_x1y1 < 0:
    degrees_final_x1y1 = 360 + degrees_x1y1
else:
    degrees_final_x1y1 = degrees_x1y1


if degrees_x2y2 < 0:
    degrees_final_x2y2 = 360 + degrees_x2y2
else:
    degrees_final_x2y2 = degrees_x2y2


 if degrees_x3y3 < 0:
    degrees_final_x3y3 = 360 + degrees_x3y3
else:
    degrees_final_x3y3 = degrees_x3y3

 if degrees_x4y4 < 0:
    degrees_final_x4y4 = 360 + degrees_x4y4
else:
    degrees_final_x4y4 = degrees_x4y4

5.为基数方向创建数组。

direction_brackets = ["NORTH", "NORTH-EAST","EAST","SOUTH-EAST","SOUTH","SOUTH-WEST","WEST","NORTH-WEST"]

6.对最终度值进行四舍五入

round_x1y1 = round(degrees_final_x1y1/45)
round_x2y2 = round(degrees_final_x2y2/45)
round_x3y3 = round(degrees_final_x3y3/45)
round_x4y4 = round(degrees_final_x4y4/45)

7.获取最终度值的最终基本方向

final_direction_x1y1 = direction_brackets[round_x1y1]
final_direction_x2y2 = direction_brackets[round_x2y2]
final_direction_x3y3 = direction_brackets[round_x3y3]
final_direction_x4y4 = direction_brackets[round_x4y4]

8.返回最终的基数方向值

 return final_direction_x1y1,final_direction_x2y2, final_direction_x3y3, final_direction_x4y4

9.创建一个名为directions_list的列表变量，以收集direction_finder函数返回的最终基本方向值。

direction_list = []
direction_list= direction_lookup(coordinates)

10.从“direction_list”变量中获取最终的基本方向。

direction_x1y1 = direction_list[0]
direction_x2y2 = direction_list[1]
direction_x3y3 = direction_list[2]
direction_x4y4 = direction_list[3]

在实现代码之后，我必须创建数据库连接来在PHPMyAdmin数据库中存储最终的基本方向，我创建了一个数据库和一个单独的表来存储最终的基本方向。这些STPE的代码如下所示。

connection = pymysql.connect(host="localhost", user="root", passwd="", database="directions")
cursor = connection.cursor()
directionsCollect= """Create Table directions_store(
    id Int(11) Primary Key Auto_Increment,
    cardinal_directions Varchar(255),
)"""


cursor.execute(directionsCollect)

之后，我实现了insert命令，向创建的表插入一个方向。

record_x1y1 = """Insert Into directions_store(id, cardinal_directions)
Values(%(cardinal_directions)s)""",
{
   'cardinal_directions': direction_x1y1
}

cursor.execute(record_x1y1)

#commit the connection
connection.commit()

#close the connection
connection.close() 

但问题是插入没有发生。错误如下所示。

Traceback (most recent call last):
File "floor_plan_detector.py", line 320, in <module>
 cursor.execute(record_x1y1)
  File "/home/sameera/anaconda3/lib/python3.7/site-packages/pymysql/cursors.py", line 163,    in execute
  result = self._query(query)
  File "/home/sameera/anaconda3/lib/python3.7/site-packages/pymysql/cursors.py", line 321, in _query
  conn.query(q)
 File "/home/sameera/anaconda3/lib/python3.7/site-packages/pymysql/connections.py", line 504, in query
  self._execute_command(COMMAND.COM_QUERY, sql)
  File "/home/sameera/anaconda3/lib/python3.7/site-packages/pymysql/connections.py", line 762, in _execute_command
  packet = prelude + sql[:packet_size-1]
  TypeError: can't concat tuple to bytes

错误表示类型错误。有人能解释一下这里出了什么问题吗？。

Answer 1

先不说你是怎么做的，

在你的台词里:

record_x1y1 = """Insert Into directions_store(id, cardinal_directions)
Values(%(cardinal_directions)s)""",
{
   'cardinal_directions': direction_x1y1
}

cursor.execute(record_x1y1)

您正在创建一个tuple（str，dict）类型的tuple:record_x1y1，然后将它传递给这样的函数。

然后，PyMySQL的Cursor.execute尝试对它执行某些操作，但它并不知道，因此出现了错误。

您应该做的是分别定义查询和参数:

record_x1y1 = """Insert Into directions_store(id, cardinal_directions)
Values(%(cardinal_directions)s)"""

params = {
   'cardinal_directions': direction_x1y1
}

cursor.execute(record_x1y1, params)

也可以将元组解包为args:

record_x1y1 = """Insert Into directions_store(id, cardinal_directions)
Values(%(cardinal_directions)s)""",
{
   'cardinal_directions': direction_x1y1
}

cursor.execute(*record_x1y1)