SQLite in Python: 如何在Python中使用SQLite数据库

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SQLite in Python: 如何在Python中使用SQLite数据库

SQLite3 可使用 sqlite3 模块与 Python 进行集成。sqlite3 模块是由 Gerhard Haring 编写的。它提供了一个与 PEP 249 描述的 DB-API 2.0 规范兼容的 SQL 接口。您不需要单独安装该模块，因为 Python 2.5.x 以上版本默认自带了该模块。

使用sqlite tutorial提供的 “chinook” sample database 数据库chinook.db，下载地址：https://www.sqlitetutorial.net/sqlite-sample-database/

同时提供了数据库的ER-Diagram实体关系图, 可以使用数据库提供的11张表进行一些练习。

import sqlite3

conn = sqlite3.connect('chinook.db')

cur = conn.cursor()

# treat the cursor object cur as an iterator
cur.execute('SELECT * from albums')

# call fetchone() method / or fetchall() method
print(cur.fetchone())

# iterating over each rows
for row in cur.execute('SELECT * from albums'):
    print(row)

cur.execute('SELECT * from customers')
print(cur.fetchone())

# add where clause 
ArtistId = ('272',)

# using ? is more secure than using %s
cur.execute('SELECT * from albums where ArtistId = ?',ArtistId)
print(cur.fetchall())

# using %s
ArtistId = ('272',)

# using ? is more secure than using %s
cur.execute('SELECT * from albums where ArtistId = %s' % ArtistId)
print(cur.fetchall())

cur.execute('SELECT * from artists')
print(cur.fetchall())

# insert value
cur.execute('INSERT OR REPLACE INTO artists values (276, "Jay Zhou")')
cur.execute('SELECT * from artists')
print(cur.fetchall())

# insert a list of records -- here we use executemany to insert another 3 singers
newArtists = [(278, 'Eason Chan'),
              (279, 'Yoga Lin'),
              (280, 'Jane Zhang'),]

# print(type(newArtists))
cur.executemany('INSERT OR IGNORE INTO artists values (? , ?)' , newArtists)
for row in cur.execute('SELECT * from artists'):
    print(row)

# using commit() to save those transactions / commiting those transations
conn.commit()
conn.close()

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SQLite in Python: 如何在Python中使用SQLite数据库

SQLite in Python: 如何在Python中使用SQLite数据库