Python+PyQt 数据库基本操作

Sqlite:

使用Python的sqlite3：

需要注意下commit方式与qt稍有不同

import sqlite3



class DBManager():

    def __init__(self):

        self.db = sqlite3.connect("core.db")

        self.query = self.db.cursor()  

        ...

        self._initTable()

        ...



    ## Create table["webpower"] if not exists

    def _initTable(self):

        self.query.execute("create table if not exists webpower (id integer primary key,name TEXT,state integer)")

        self.db.commit()



    ...

 

使用QtSql:

 1 from PyQt4.QtSql import QSqlQuery,QSqlDatabase

 2 

 3 class DBManager():

 4     def __init__(self):

 5         self.db = QSqlDatabase.addDatabase("QSQLITE") #select database type

 6         self.db.setDatabaseName("core.db") # set database name

 7         self.db.open()  #connect to or create database  

 8         self.query = QSqlQuery() #sql handler

 9         ...    

10     

11     ...

 

Mysql:

from PyQt4.QtSql import QSqlQuery,QSqlDatabase



class DBManager():

    def __init__(self):

        self.db = QSqlDatabase.addDatabase("QMYSQL")  #select database type

        self.db.setHostName("localhost")  #set address

        self.db.setUserName("root"); #set user name

        self.db.setPassword("root"); #set user pwd

        self._trytoConnect() #check connection

        self.query = QSqlQuery()



        ## create database

        self.query.exec_("CREATE DATABASE test1")



        ## Choose database

        self.db.setDatabaseName("test1")

        self._trytoConnect()

        #also can be :self.query.exec_("USE test1")



    ## Connect and check connection state

    def _trytoConnect(self):

        if (self.db.open()):     

            print "Success"

        else:

            print "Failed to connect to mysql"



    ...

 

常用SQL：

--create table

create table if not exists test2 (id integer primary key,time real,powers real);



--clear table

delete from test2;



--insert

insert into t1 values(1,0.1,0.2);



--select

select * from test1



--delete table

drop table test4