1. 如何创建SQLite数据库

# 1. create database and table

'''
sqlite3
内置模块，不需要安装
'''
import sqlite3
import os

dbPath = 'data.sqlite'
if not os.path.exists(dbPath):
    conn = sqlite3.connect(dbPath)
    c = conn.cursor()
    c.execute('''create table persons
              (id int primary key not null, 
               name text not null,
               age int not null,
               address char(100),
               salary real);''')
    conn.commit()
    conn.close()
    print('创建数据库成功')
创建数据库成功

2. 如何向SQLite表中插入数据

# 2. insert
conn = sqlite3.connect(dbPath)
c = conn.cursor()
c.execute('delete from persons')
c.execute('''
            insert into persons(id, name, age, address, salary)
            values(1, 'Bill', 32, 'Colifornia', 20000);''')
c.execute('''
            insert into persons(id, name, age, address, salary)
            values(2, 'Mike', 30, 'China', 10000);''')
c.execute('''
            insert into persons(id, name, age, address, salary)
            values(3, 'Jhon', 12, 'Norway', 30000);''')
conn.commit()
print('insert success')
insert success

3. 如何查询SQLite表中的数据

# 3. select
persons = c.execute('select name, age, address, salary from persons order by age')
print(type(persons))
result = []
for person in persons:
    value = {}
    value['name'] = person[0]
    value['age'] = person[1]
    value['address'] = person[2]
    result.append(value)
conn.close()
print(type(result))
print(result)


import json
resultStr = json.dumps(result)
print(resultStr)
<class 'sqlite3.Cursor'>
<class 'list'>
[{'name': 'Jhon', 'age': 12, 'address': 'Norway'}, {'name': 'Mike', 'age': 30, 'address': 'China'}, {'name': 'Bill', 'age': 32, 'address': 'Colifornia'}]
[{"name": "Jhon", "age": 12, "address": "Norway"}, {"name": "Mike", "age": 30, "address": "China"}, {"name": "Bill", "age": 32, "address": "Colifornia"}]

​​44 - 操作MySQL数据库​​