将Mysql表写入csv文件

Question

我试图将一个Mysql表写入一个csv文件，当我这样做时，表中的某些行丢失了（它们在哪里消失了？）。当我将Mysql表写入txt文件时，没有丢失任何行。这是代码：

import pymysql
import csv


db1 = pymysql.connect(host="localhost",
                    user="root",
                    password='secret',
                    port=3306,
                    db='world'
                    )


try :
    with db1.cursor() as cursor:
    # Read all 4079 lines
        sql = 'select * from city;'
        cursor.execute(sql)
        result = cursor.fetchall()
        #csv file contains 4063 lines instead of 4079
        c = csv.writer(open("db_csv.csv", "w", newline='\n', encoding='UTF-8'))
        c.writerows(result)
        #txt file contains 4079 lines
        with open('db_txt.txt', 'w') as file:
            for row in result:
                file.write(str(row))



finally:
    db1.close()