python-简单的sqlite3使用

Posted 2020-11-19 小L

 1 # 导入SQLite驱动:
 2 >>> import sqlite3
 3 # 连接到SQLite数据库
 4 # 数据库文件是test.db
 5 # 如果文件不存在，会自动在当前目录创建:
 6 >>> conn = sqlite3.connect(‘test.db‘)
 7 # 创建一个Cursor:
 8 >>> cursor = conn.cursor()
 9 # 执行一条SQL语句，创建user表:
10 >>> cursor.execute(‘create table user (id varchar(20) primary key, name varchar(20))‘)
11 <sqlite3.Cursor object at 0x10f8aa260>
12 # 继续执行一条SQL语句，插入一条记录:
13 >>> cursor.execute(‘insert into user (id, name) values (‘1‘, ‘Michael‘)‘)
14 <sqlite3.Cursor object at 0x10f8aa260>
15 # 通过rowcount获得插入的行数:
16 >>> cursor.rowcount
17 1
18 # 关闭Cursor:
19 >>> cursor.close()
20 # 提交事务:
21 >>> conn.commit()
22 # 关闭Connection:
23 >>> conn.close()
24 
25 
26 
27 >>> conn = sqlite3.connect(‘test.db‘)
28 >>> cursor = conn.cursor()
29 # 执行查询语句:
30 >>> cursor.execute(‘select * from user where id=?‘, (‘1‘,))
31 <sqlite3.Cursor object at 0x10f8aa340>
32 # 获得查询结果集:
33 >>> values = cursor.fetchall()
34 >>> values
35 [(‘1‘, ‘Michael‘)]
36 >>> cursor.close()
37 >>> conn.close()