Python2.7编程中SQLite3基本操作方法示例

# -*- coding: utf-8 -*-
#!/usr/bin/env python
import sqlite3
def mykey(x):
  return x[3]
conn=sqlite3.connect("D:\\demo\\my_db.db")
sql = "CREATE TABLE IF NOT EXISTS mytb ( a char , b int , c real, d DATE)"
# a char , b int , c real 表示该表有三个字段，
# a 是字符串类型， b 是整数类型, c 是实数类型。
conn.execute( sql )
cs = conn.cursor()
#cs.execute("DELETE FROM mytb WHERE A='张三' ")
cs.execute("DELETE FROM mytb  ")
#删除所有记录
'''''
cs.execute( "INSERT INTO mytb ( a,b,c,d ) values('Zhang San',25, 120, '2014-03-04')" )
cs.execute( "INSERT INTO mytb ( a,b,c,d ) values( 'Wang Wu',24, 110, '2014-05-01')" )
cs.execute( "INSERT INTO mytb ( a,b,c,d ) values( 'Li Si',23, 130, '2014-04-06')" )
'''
#批量注入，batchdata是一个列表，列表里每一个元素都是一个元组
batchdata=[('Zhang San',25, 120, '2014-03-04'),
      ( 'Wang Wu',24, 110, '2014-05-01'),
      ( 'Li Si',23, 130, '2014-04-06')]
cs.executemany('INSERT INTO mytb values (?,?,?,?)',batchdata)
conn.commit() #将加入的记录保存到磁盘，非常重要！
cs.execute("SELECT name, sql FROM sqlite_master WHERE type='table'")
recs = cs.fetchall( )
print ( recs )
cs.execute( "SELECT * FROM mytb ")#打开数据表
recs = cs.fetchall()#取出所有记录
print ( "there is ", len(recs)," notes." )
print recs
recs.sort(key = mykey)
print recs
cs.close()
conn.close()

sql="DELETE FROM my_table WHERE number='" + my_num + "'"
cs.execute(sql)

sql="SELECT name FROM my_table WHERE number ='" + my_num + "'"
cs.execute(sql)
the_name=(cs.fetchall())[0][0].decode('utf-8')

sql="INSERT OR REPLACE INTO "+my_table+" values (?,?,?,?,?,?,?) "
#假设my_table有7项

batch=[(stock_num, unicode(stock_name, "gbk") )]
cs.executemany( "INSERT OR REPLACE INTO my_table values (?,?) ",batch)