python - 在python中读取数据库并写入文件

Question

我连接到 mysql 数据库并使用它进行查询，但我需要它们立即写入文件，执行此操作的简单方法是什么？

conn = MySQLdb.connect(host="localhost",user="root",passwd="",db="mydb")
cursor = conn.cursor(MySQLdb.cursors.DictCursor)
cursor.execute("SELECT * FROM books")

..

Answer 1

您可以使用上面的代码:(每行插入为新行)

 conn = MySQLdb.connect(host="localhost",user="root",passwd="",db="mydb")
    cursor = conn.cursor(MySQLdb.cursors.DictCursor)
    cursor.execute("SELECT * FROM books")
    result_set = cursor.fetchall()    
    field_names = [val[0] for val in cursor.description]

with open('yourfile.txt', 'a') as f:
    for row in result_set:
       line = ','.join(row[field_name] for field_name in field_names)
       f.write(line)