Python 将列名写入文件

我有一个SQLite DB文件，我正在将DB表中每一列的数据解析为一个.txt文件。目前，它正在将列内容写入文件，但不会提取列名称并写入这些内容。我怎样才能做到这一点，因为我已经尝试使用这个指南，但我似乎无法让它发挥作用。下面是我试图从表中提取列名的代码

import sqlite3
from sqlite3 import Error


# create a database connection to the SQLite database specified by the db_file
def create_connection(db_file,detect_types=sqlite3.PARSE_DECLTYPES):
    try:
        conn = sqlite3.connect(db_file)
        return conn
    except Error as e:
        print(e)

    return None

# Query specific rows in the sms table
def select_data(conn):
    cur = conn.cursor()

    cur.execute("SELECT _id, address, strftime('%d-%m-%Y', date / 1000, 'unixepoch'),read, type, body, seen FROM sms")
    print("Writing the contents of the sms table to an evidence file")
    print("\t")

# Trying to pull out column names from db table
def get_col_names():
    conn = sqlite3.connect("mmssms.db")
    c = conn.cursor()
    c.execute("SELECT _id, address, strftime('%d-%m-%Y', date / 1000, 'unixepoch'),read, type, body, seen FROM sms")
    return [member[0] for member in c.description]



    # Write the data to a smsEvidence.txt file
    with open('EvidenceExtractionFiles/smsInfo.txt', 'a+') as f:
        rows = cur.fetchall()
        for row in rows:
            #print(row)

            f.write("%s\n" % str(row))
        print("SMS Data is written to the evidence File")



# path to where the db files are stored
def main():
    database = "H:\College Fourth Year\Development Project\Final Year Project 2018\mmssms.db"

     # create a database connection
    conn = create_connection(database)
    with conn:

        # print("Query specific columns")
        select_data(conn)
    # close db connection
    if(conn):
        conn.close()
        print("Database closed")


if __name__ == '__main__':
    main()

---

您可以使用

光标。description

保存有关列名的信息：

[……]

cur = cursor.execute('SELECT * FROM test_table LIMIT 100')
col_names = [ name[0] for name in cur.description ]
print (col_names)

---

[…]

光标的输出是什么。您现在得到的描述是什么？根本没有输出，它现在不再写入文件。您没有在任何地方调用

get\u col\u names

，因此您没有输出。您的文件写入代码现在位于

get\u col\u names

的

return

语句之后，因此它永远不会到达，因此没有文件被写入。它现在正在工作。我设法从DB表中提取每个列名并将其写入文件。然后，我能够提取列数据并在之后将其写入文件。现在开始工作了，谢谢。

cur = cursor.execute('SELECT * FROM test_table LIMIT 100')
col_names = [ name[0] for name in cur.description ]
print (col_names)