[pymysql]查询基础

import pymysql

# 获取连接
conn = pymysql.connect(
    host='10.105.212.1',
    port=3306,
    user='root',
    password='DemoDemo',
    database='db',
    charset='utf8'
)

# 获取游标
# 字典方式显示 pymysql.cursors.DictCursor {'id': 1, 'name': 'liuxu', 'password': '12345'}
cursor = conn.cursor(pymysql.cursors.DictCursor)
# cursor = conn.cursor()


# 准备SQL语句
sql = 'select * from users;'


print(cursor.execute(sql))		# 返回受影响的函数
print(cursor.fetchone())        # 取出一行数据，	(1, 'liuxu', '12345')
print(cursor.fetchmany(2))      # 取出N行数据
print(cursor.fetchall())        # 取出剩下所有数据
"""
4
{'id': 1, 'name': 'liuxu', 'password': '12345'}
[{'id': 2, 'name': 'liuxu2', 'password': '12345'}, {'id': 3, 'name': 'liuxu3', 'password': '12345'}]
[{'id': 4, 'name': 'liuxu4', 'password': '12345'}]
"""