TypeError：并非使用MySQL和Python在字符串格式化期间转换所有参数

Question

I am importing text file to mysql database by using python script, but I get a weird error and search for it over internet but could'nt find exact solution. I want to create columns and some columns will store data in decimal with negative sign like this

Alarmdata    fuAlarm
-1585.4       -35.3
-343.32       -54.3

I get the following error

_mysql_exceptions.ProgrammingError: (1064, "You have an error in your
SQL syntax; check the manual that corresponds to your MySQL server
version for the right syntax to use near '                 Alarmdata,
fuel_in_l DECIMAL(5,2), fuAlarm DECIMAL(4,3),        ' at line 1")

I solved this issue by giving data type to blank data but now I am facing this error.

TypeError: not all arguments converted during string formatting

My code is below

import os
import sys
import csv
import MySQLdb as mdb

con = mdb.connect('localhost' , 'root' , 'kami' , 'tempdat')

cursor = con.cursor()
cursor.execute('CREATE TABLE Datatmp (id INT NOT NULL PRIMARY KEY     AUTO_INCREMENT, \
            timestamp INT(12), pomode INT(3), modeAlarm INT(3), \
            temperature_C DECIMAL(2,1), temperatureAlarm INT(3), \
            switch INT(3), Powerswitch INT(3), SIM_dollar INT , \
            Alarmdata INT, fuel_in_l DECIMAL(5,2), fuAlarm DECIMAL(4,3), \
            next_maint DECIMAL(5,2), next_maintenanceAlarm INT(2) )');

con.commit()             

file = open('//home/mysql/kami.txt', 'rb')
creader = csv.reader(txtfile.readlines()[3:], delimiter='\t')

for t in creader:
    cursor.execute('INSERT INTO Datatmp(timestamp, pomode, modeAlarm,\
                    temperature_C, temperatureAlarm, \
                    switch, Powerswitch, SIM_dollar, \
                    Alarmdata, fuel_in_l, fuAlarm \   
                    next_maint,  next_maintenanceAlarm)\
                    Values(%s,%s,%s,%s,%s,%s,NULL,NULL,%s,%s,%s,\
                    %s,%s,%s,%s,%s,%s)', t) 

file.close()
con.commit()
con.close()

Type error mean that I didn't pass enough %s , but I passed the same number and it should not display this error. I am new to MySQL and python as well, so I didn't solve.

Answer 1

In MySQL, INT datatype can have the value ranges from -2147483648 to 2147483647 . So you can simply put the datatype INT there. Rest everything will be by taken care by MySQL.

Answer 2

(Posted on behalf of the OP) .

I solved this problem. The issue is that blank spaces are read by Python if we convert them to type of None.

Answer 3

import os
import sys
import csv
import MySQLdb as mdb


con = mdb.connect('localhost' , 'root' , 'kami' , 'tempdat')

cursor = con.cursor()
cursor.execute('CREATE TABLE Datatmp (timestamp INT(12), pomode INT(3), \
            modeAlarm INT(3), temperature_C DECIMAL(2,1),temperatureAlarm INT(3), \
            switch INT(3), Powerswitch INT(3),SIM_dollar INT(3), \
            Alarmdata INT(5),fuel_in_l DECIMAL(5,2), fuAlarm DECIMAL(4,3), \
            next_maint DECIMAL(5,2), next_maintenanceAlarm INT(2))');




con.commit()             

file = open('//home/mysql/kami.txt', 'rb')
creader = csv.reader(txtfile.readlines()[3:], delimiter='\t')



# now insert values in database
i = 0;

# read and store the values in database and also replace empty data 

for t in creader:
    print t
    for idx, v in enumerate(t):
        if v == ' ':
            t[idx] = None                   
    cursor.execute('INSERT INTO Data_121_RAPI_txt VALUES(%s,%s,%s,%s,%s,%s, \
                %s,%s,%s,%s,%s,%s, %s)', t)                
 i = i + 1



file.close()
con.commit()
con.close()

Here I face two problems. 1) if there are empty columns like Alarmdata, I still need to pass datatype and here I pass INT datatype so this error can easily be removed.

 2)   TypeError: not all arguments converted during string formatting     

Here the problem was that I pass NULL in cursor.execute and it gives error, so I make code which turn every empty space and write there None. and in palceholder I didn't provide NULL but simply normal palceholder, and also providing correct number of placeholders , the issue is solved.

I hope it will help people.