PyMySQL安装:
pip install pymysql
连接数据库:
基本操作:
# 导入pymysql模块 import pymysql # 连接database conn = pymysql.connect(host=“你的数据库地址”, user=“用户名”,password=“密码”,database=“数据库名”,charset=“utf8”) # 1.得到一个可以执行SQL语句的光标对象 cursor = conn.cursor()
# 2.得到一个可以执行SQL语句并且将结果作为字典返回的游标 cursor = conn.cursor(cursor=pymysql.cursors.DictCursor)
# 定义要执行的SQL语句
sql = """CREATE TABLE USER1 ( id INT auto_increment PRIMARY KEY ,
name CHAR(10) NOT NULL UNIQUE,
age TINYINT NOT NULL )ENGINE=innodb
DEFAULT CHARSET=utf8; """
# 执行SQL语句
cursor.execute(sql)
# 关闭光标对象
cursor.close()
# 关闭数据库连接
conn.close()
增删改查操作:
增:
sql = "INSERT INTO USER1(name, age) VALUES (%s, %s);" username = "Alex" age = 18
插入数据失败回滚:
sql = "INSERT INTO USER1(name, age) VALUES (%s, %s);"
username = "Alex"
age = 18
try:
# 执行SQL语句
cursor.execute(sql, [username, age])
# 提交事务
conn.commit()
except Exception as e:
# 有异常，回滚事务
conn.rollback()
获取插入数据ID:
sql = "INSERT INTO USER1(name, age) VALUES (%s, %s);"
username = "Alex"
age = 18
try:
# 执行SQL语句
cursor.execute(sql, [username, age])
# 提交事务
conn.commit()
# 提交之后，获取刚插入的数据的ID
last_id = cursor.lastrowid
except Exception as e:
# 有异常，回滚事务
conn.rollback()
删:
sql = "DELETE FROM USER1 WHERE id=%s;"
改:
sql = "UPDATE USER1 SET age=%s WHERE name=%s;"
username = "Alex"
age = 80
try:
# 执行SQL语句
cursor.execute(sql, [age, username])
# 提交事务
conn.commit()
except Exception as e:
# 有异常，回滚事务
conn.rollback()
查:
# 查询数据的SQL语句 sql = "SELECT id,name,age from USER1 WHERE id=1;" # 执行SQL语句 cursor.execute(sql) # 获取单条查询数据 ret = cursor.fetchone()
