python操作sqlite3数据库完全代码

# Name: pySnipnix.py
# Author: pantuts
# Email: pantuts@gmail.com
# Description: Saving your snippets to sqlite3 database.
# Agreement: You can use, modify, or redistribute this tool under
# the terms of GNU General Public License (GPLv3).
# This tool is for educational purposes only. Any damage you make will not affect the author.
# first run: python pySnipnix.py
 
#!/usr/bin/python
 
import argparse
import sqlite3
import re
import sys
 
# important, create the file
fileN = open('database.db', 'a+')
 
def main():
     
    # add all arguments needed
    # for argument that need FILE use [ type=argparse.FileType('r') ]
    parser = argparse.ArgumentParser(description=None, usage='python %(prog)s -h --help -f file -s search -a \'title\' \'code here\' -e id -d id -v --version')
    parser.add_argument('-f', metavar='filename', type=argparse.FileType('r'), dest='filename', help='File for database')
    parser.add_argument('-s', metavar='string', dest='search', help='Search for string in database')
    parser.add_argument('-a', metavar='string', dest='add', nargs=2, help='Add snippet. You should use \'\' for long string')
    parser.add_argument('-e', metavar='id', type=int, dest='edit', help='Edit snippet')
    parser.add_argument('-d', metavar='id', type=int, dest='delete', help='Delete from database')
    parser.add_argument('-S', dest='show', action='store_true', help='Show all records')
    parser.add_argument('-v', '--version', action='version', version='%(prog)s 1.0', help='Print version')
     
    # parse all arguments to 'args'
    args = parser.parse_args()
     
    # database connection
    conn = sqlite3.connect('database.db')
    cur = conn.cursor()
     
    def createTable():
        cmd = 'CREATE TABLE IF NOT EXISTS snippets (id INTEGER PRIMARY KEY AUTOINCREMENT, title VARCHAR(50), code VARCHAR NOT NULL)'
        cur.execute(cmd)
        conn.commit()
         
    def insertSnippets():
        # convert the string to lowercase and then execute
        lst = [args.add[0].lower() , args.add[1].lower()]
        cmd = 'INSERT INTO snippets VALUES (NULL, ?, ?)'
        cur.execute(cmd, lst)
        conn.commit()
         
        print('\nNew Snippet...')
        print('Snippet Title: \t%s' % args.add[0])
        print('Code: \t\t%s' % args.add[1])
         
    def editSnippets():
        cur.execute('SELECT * FROM snippets where id=%s' % str(args.edit))
        res = cur.fetchone()
        if res is None:
            print('No record to edit!')
        else:
            resl = [result for result in res]
            print('Current title >> ' + resl[1])
            ed1 = input('Title (Leave black, same title): ')
            print('Current snippet >> ' + resl[2])
            ed2 = input('Code: ')
            if ed1 is '':
                ed1 = resl[1]
            cur.executemany('UPDATE snippets SET title=\'%s\', code=\'%s\' WHERE id=?' % (ed1.lower(), ed2.lower()), str(resl[0]))
            conn.commit()
            print('Done!\n')
     
    def deleteSnippets():
        print('\nDeleting record with ID %s ...' % str(args.delete))
         
        # first find if record exists and return false if not found
        cur.execute('SELECT * FROM snippets where id=%s' % str(args.delete))
        res = cur.fetchone()
        if res is None:
            print('No record to delete!')
        else:
            cmd = 'DELETE FROM snippets where id=%s' % str(args.delete)
            cur.execute(cmd)
            conn.commit()
            print('Deleted!\n')
     
    def showOrSearch(cmd):
        # creating conn.create_function explanation: 1st(string to be used inside SQL), 2nd(count of arguments), 3rd(the function created)
        def matchPattern(pattern, columnName):
            pat = re.compile(pattern)
            return pat.search(columnName) is not None
        conn.create_function('matchPattern', 2, matchPattern)
         
        if cmd == 2:
            cur.execute('SELECT * FROM snippets WHERE matchPattern(\'%s\', title)' % str(args.search.lower()))
        else:
            cmd = 1
            cur.execute('SELECT * FROM snippets')
        res = cur.fetchall()
        # create empty dict, process filter keys and values
        s = {'id':{}, 'title':{}, 'code':{}}
        print('\nRecords result...')
        for result in res:
            s['id'] = result[0]
            s['title'] = result[1]
            s['code'] = result[2]
            print('[%s]\t[ %s ]---------->[ %s ]\n' % (s['id'], s['title'], s['code']))
         
    # invoke creation of table
    createTable()
     
    if len(sys.argv) < 1:
        parser.print_help()
     
    # do filtering when -f 'filename' is correct
    if args.filename is not None:
         
        if args.show:
            if args.add or args.delete or args.search or args.edit:
                print('\nYou can\'t use other options with -S option')
                exit()
            else:
                args.add = None
                args.delete = None
                args.search = None
                args.edit = None
                showOrSearch(1)
         
        elif args.edit:
            if args.add or args.delete or args.search:
                print('\nYou can\'t use other options with -e option')
                exit()
            else:
                args.search = None
                args.add = None
                args.delete = None
                editSnippets()
         
        else:
            if args.add is None and args.delete is None and args.search is None:
                print('\n!!!!!You need to specify addional arguments to process the database!!!!!\n')
                parser.print_help()
             
            if args.search:
                args.edit = None           
                showOrSearch(2)
             
            if args.add:
                args.edit = None
                args.search = None             
                insertSnippets()
                 
            if args.delete:
                args.search = None
                args.edit = None
                deleteSnippets()
                 
     
    else:
        parser.print_help()
     
    # close our connection to the database
    conn.commit()
    conn.close()   
     
def by():
    print('\n[Script by: pantuts]')
    print('[email: pantuts@gmail.com]')
 
if __name__=="__main__":
    main()
    # close our file
    fileN.close()

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