SQL内部代码或过程？

Question

This is a very straight forward question regarding how to insert or select data from/to a database ? Since i'm trying to keep my code as clean as possible, this is how i'm actually performing queries and inserts/updates:

import sys
import MySQLdb
from ConfigParser import SafeConfigParser

#------------------------------------------------------------
# Select and insert
# this func should be called like:
# db_call('c:\dbconf.cfg','select * from something') 
# or insert / update statement.
#------------------------------------------------------------
def db_call(cfgFile, sql):
    parser = SafeConfigParser()
    parser.read(cfgFile)
    dbType = parser.get('database', 'db_type')
    db_host = parser.get('database', 'db_host')
    db_name = parser.get('database', 'db_name')
    db_user = parser.get('database', 'db_login')
    db_pass = parser.get('database', 'db_pass')

    con = MySQLdb.connect(host=db_host, db=db_name,
                          user=db_user, passwd=db_pass
                          )
    cur = con.cursor()
    try:
        try:
            cur.execute(sql)
            if re.match(r'INSERT|insert|UPDATE|update|DELETE|delete', sql):
                con.commit()
            else:
                data = cur.fetchall()
                resultList = []
                for data_out in data:
                    resultList.append(data_out)
                return resultList
        except MySQLdb.Error, e:
            con.rollback()
            print "Error "
            print e.args
            sys.exit(1)
        else:
            con.commit()
    finally:
        con.close()

But, using this method i have to keep all the queries inside my main class, where that can be a problem if any change happens into the table structure,

But, going for sp call, i can have the code more clean, passing only the sp name and fields. But sometimes this could lead me to have one python function for more specific cases, ( as an example, sp that receives 2,3 or 4 inputs must have diferent python functions for each )

import sys
import MySQLdb
from ConfigParser import SafeConfigParser


#------------------------------------------------------------
# Select only!!!!!!
# this func should be called like:
# db_call('fn_your_function','field_a','field_b') 
# or insert / update statement.
#------------------------------------------------------------
def db_call(self, cfgFile, query):
    parser = SafeConfigParser()
    parser.read(cfgFile)
    dbType = parser.get('database', 'db_type')
    db_host = parser.get('database', 'db_host')
    db_name = parser.get('database', 'db_name')
    db_user = parser.get('database', 'db_login')
    db_pass = parser.get('database', 'db_pass')

    con = MySQLdb.connect(host=db_host, db=db_name,
                          user=db_user, passwd=db_pass
                          )
    cur = con.cursor()

    try:
        cur.callproc(query[0], (query[1],query[2]))
        data = cur.fetchall()
        resultList = []
        for data_out in data:
            resultList.append(data_out)
        return resultList
        con.close()
    except MySQLdb.Error, e:
        con.rollback()
        print "Error "
        print e.args
        sys.exit(1)

Im not sure if here is the right place to ask this, but before voting to close it (if is the case ) please reply with the information where i could ask this kind of question :)

Thanks in advance.

Answer 1

If your goal is to abstract away the schema of your DB from your objects' implementations, you should probably be looking at ORMs/persistence frameworks. There are a number of them in Python. As examples, SQLAlchemy is popular and Django, a popular web framework, has one built in.