用Python创建一个mySQL数据库的函数

Question

我用Python和MySQL写了一个程序，这个程序可以创建一个数据库，并从文本文件中导入数据，把它们放到四个不同的列里。代码是能运行的，但我想改进一下，创建一些函数。

有没有人能帮我写一个创建MySQL数据库的函数？这是我现在的代码。非常感谢！

import MySQLdb 

 # Create connection to the MySQL database - Make sure host, user, 
 # passwd are consistent with the database you are trying to conect to

 def create_database():
     db_connection = MySQLdb.connect(host='localhost', user='root', passwd='password') 

     # Variable that exacutes Database calls with MySQL

     cursor = db_connection.cursor()

     # Create databse with MYSQL query - databasename

     cursor.execute('CREATE DATABASE inb104')

     # Select which database to use with MYSQL query - databasename

     cursor.execute('USE inb104')

     # Create database with MYSQL query - tablename & fields 

     cursor.execute('''CREATE TABLE popularity (
                       PersonNumber INT,
                       Value VARCHAR(70),
                       Category VARCHAR(25),
                       PRIMARY KEY (PersonNumber, Value, Category)
                       )
                   ''')




    cursor.execute("LOAD DATA LOCAL INFILE 'tv.txt' INTO TABLE popularity FIELDS TERMINATED BY '\\t' LINES TERMINATED BY '\\n' (PersonNumber, Value, Category) SET     Category='TV'")

    cursor.execute("LOAD DATA LOCAL INFILE 'actors.txt' INTO TABLE popularity FIELDS TERMINATED BY '\\t' LINES TERMINATED BY '\\n' (PersonNumber, Value, Category) SET Category='Actors'")

    cursor.execute("LOAD DATA LOCAL INFILE 'movies.txt' INTO TABLE popularity FIELDS TERMINATED BY '\\t' LINES TERMINATED BY '\\n' (PersonNumber, Value, Category) SET Category='Movies'")

    cursor.execute("LOAD DATA LOCAL INFILE 'sports.txt' INTO TABLE popularity FIELDS TERMINATED BY '\\t' LINES TERMINATED BY '\\n' (PersonNumber, Value, Category) SET Category='Sports'")

    cursor.execute("LOAD DATA LOCAL INFILE 'activities.txt' INTO TABLE popularity FIELDS TERMINATED BY '\\t' LINES TERMINATED BY '\\n' (PersonNumber, Value, Category) SET Category='Activities'")

    cursor.execute("LOAD DATA LOCAL INFILE 'musicians.txt' INTO TABLE popularity FIELDS TERMINATED BY '\\t' LINES TERMINATED BY '\\n' (PersonNumber, Value, Category) SET Category='Musicians'")

    cursor.execute("LOAD DATA LOCAL INFILE 'games.txt' INTO TABLE popularity FIELDS TERMINATED BY '\\t' LINES TERMINATED BY '\\n' (PersonNumber, Value, Category) SET Category='Games'")

    cursor.execute("LOAD DATA LOCAL INFILE 'books.txt' INTO TABLE popularity FIELDS TERMINATED BY '\\t' LINES TERMINATED BY '\\n' (PersonNumber, Value, Category) SET Category='Books'")



    # commit the changes to the database
    db_connection.commit()


    # close the cursor and connection
    cursor.close()

    db_connection.close()

---

好的，这是我目前的进展。

我遇到了这个错误：TypeError: data_entry() takes no arguments (1 given)

而且，数据也没有从文本文件插入到表格里。任何帮助都将非常感激！！

import MySQLdb 


def connect_to_database(user, password):

return MySQLdb.connect(host='localhost', user=user, passwd=password) 


def create_database(cursor):

cursor.execute('CREATE DATABASE inb104')

cursor.execute('USE inb104')

cursor.execute('''CREATE TABLE popularity (
                      PersonNumber INT,
                      Value VARCHAR(70),
                      Category VARCHAR(25),
                      PRIMARY KEY (PersonNumber, Value, Category)
                      )
                      ''')

def load_file(cursor, *files):
"""Load the files given in (filename, category) format."""
sql = '''LOAD DATA LOCAL INFILE '%s' INTO TABLE popularity 
         FIELDS TERMINATED BY '\\t' 
         LINES TERMINATED BY '\\n' 
         (PersonNumber, Value, Category) 
         SET Category='%s'")
     '''
for filename, category in files:
    cursor.execute(sql, (filename, category))


def data_entry():
"""Connect to the DB server, create the DB and table and load the table with records
""" 
db = connect_to_database('root', 'password')
cursor = db.cursor()
create_database(cursor)
load_files(cursor,('tv.txt', 'TV'), ('actors.txt', 'Actors'), 
           ('movies.txt', 'Movies'))
db.commit()
cursor.close()
db.close()

Answer 1

你用来加载数据的SQL语句应该是：

sql = '''LOAD DATA LOCAL INFILE %s INTO TABLE popularity 
         FIELDS TERMINATED BY ';' 
         LINES TERMINATED BY '\\n' 
         (PersonNumber, Value, Category) 
         SET Category=%s
     '''

+ %s --> '%s'
+ remove " at the end

这样应该就能正常工作了。还有，load_files 应该改成 load_file。