mysql的参数绑定

import mysql.connector

# 连接到MySQL数据库
db = mysql.connector.connect(
    host="localhost",
    user="yourusername",
    password="yourpassword",
    database="yourdatabase"
)

cursor = db.cursor()

# 使用位置参数绑定
sql = "SELECT * FROM users WHERE id = %s"
user_id = 1
cursor.execute(sql, (user_id,))

# 获取查询结果
result = cursor.fetchall()
for row in result:
    print(row)

# 关闭连接
cursor.close()
db.close()

import mysql.connector

# 连接到MySQL数据库
db = mysql.connector.connect(
    host="localhost",
    user="yourusername",
    password="yourpassword",
    database="yourdatabase"
)

cursor = db.cursor()

# 使用命名参数绑定
sql = "SELECT * FROM users WHERE id = %s"
user_id = 1
cursor.execute(sql, {'id': user_id})

# 获取查询结果
result = cursor.fetchall()
for row in result:
    print(row)

# 关闭连接
cursor.close()
db.close()

import mysql.connector

# 连接到MySQL数据库
db = mysql.connector.connect(
    host="localhost",
    user="yourusername",
    password="yourpassword",
    database="yourdatabase"
)

cursor = db.cursor()

# 使用位置参数绑定
sql = "SELECT * FROM users WHERE name = %s"
user_name = "John Doe"
cursor.execute(sql, (user_name,))

# 获取查询结果
result = cursor.fetchall()
for row in result:
    print(row)

# 关闭连接
cursor.close()
db.close()