基於python的-SQlite數據庫練習

# -*- coding:utf-8 -*-

import sqlite3
connect = sqlite3.connect('test.db')
cursor = connect.cursor()

# 1,創建一個學生成績表 Grades，學號  姓名  成績  名次
sql = 'CREATE TABLE Grades(num INTEGER PRIMARY KEY, name TEXT, grade INTEGER, rank INTEGER )'
# cursor.execute(sql)

# 2，往表中插入10數據
sql = 'INSERT INTO Grades(num,name,grade,rank) VALUES(8,"吼吼",50,89)'
# cursor.execute(sql)
# connect.commit()

# 3，查詢成績大於60分的人的名字
sql = 'SELECT name,grade FROM Grades WHERE grade > 60'
# rs = cursor.execute(sql)
# for x in rs:
#     print(x)

# 4，查詢成績小於60分的人的個數
sql = 'SELECT COUNT(*) FROM Grades WHERE grade < 60'
# rs = cursor.execute(sql)
# for x in rs:
#     print(x)
# connect.commit()

# 5，把成績小於60分的人的成績修改爲60分
sql = 'UPDATE Grades SET grade = 60 WHERE grade < 60'
# cursor.execute(sql)
# connect.commit()

# 6，刪除所有學號小於100的人的信息
sql = 'DELETE FROM Grades WHERE num < 100'
# cursor.execute(sql)
# connect.commit()

# 7，查詢姓“張”的人的所有信息
sql = 'SELECT * FROM Grades WHERE name LIKE "張%"'
# rs = cursor.execute(sql)
# for x in rs:
#     print(x)
# connect.commit()

# 8，查詢所有人的成績，按照成績從高到低排列
sql = 'SELECT grade FROM Grades ORDER BY grade DESC'
# rs = cursor.execute(sql)
# for x in rs:
#     print(x)
# connect.commit()

# 9，查詢所有人的成績，按照名次從小到大排列
sql = 'SELECT rank FROM Grades ORDER BY rank ASC'
# rs = cursor.execute(sql)
# for x in rs:
#     print(x)
# connect.commit()

# 關閉遊標
cursor.close()
# # 關閉數據庫連接
connect.close()