用phy写一个增删改查

这里给您提供一个用 Python 的 Flask 框架实现增删改查的示例代码：

from flask import Flask, request, jsonify

app = Flask(__name__)

# 模拟一个数据库，存储学生信息
students = [
    {"id": 1, "name": "Tom", "age": 20},
    {"id": 2, "name": "Jerry", "age": 21},
    {"id": 3, "name": "Mike", "age": 22}
]

# 查询所有学生信息
@app.route('/students', methods=['GET'])
def get_students():
    return jsonify(students)

# 根据 id 查询学生信息
@app.route('/students/<int:student_id>', methods=['GET'])
def get_student(student_id):
    for student in students:
        if student['id'] == student_id:
            return jsonify(student)
    return jsonify({"message": "Student not found"})

# 添加学生信息
@app.route('/students', methods=['POST'])
def add_student():
    new_student = {
        "id": request.json['id'],
        "name": request.json['name'],
        "age": request.json['age']
    }
    students.append(new_student)
    return jsonify({"message": "Student added successfully"})

# 根据 id 更新学生信息
@app.route('/students/<int:student_id>', methods=['PUT'])
def update_student(student_id):
    for student in students:
        if student['id'] == student_id:
            student['name'] = request.json['name']
            student['age'] = request.json['age']
            return jsonify({"message": "Student updated successfully"})
    return jsonify({"message": "Student not found"})

# 根据 id 删除学生信息
@app.route('/students/<int:student_id>', methods=['DELETE'])
def delete_student(student_id):
    for student in students:
        if student['id'] == student_id:
            students.remove(student)
            return jsonify({"message": "Student deleted successfully"})
    return jsonify({"message": "Student not found"})

if __name__ == '__main__':
    app.run(debug=True)

这个示例代码实现了一个简单的增删改查功能，使用 Flask 框架搭建 Web 服务，模拟了一个简单的数据库，包括了查询所有学生信息、根据 id 查询学生信息、添加学生信息、根据 id 更新学生信息、根据 id 删除学生信息等功能。您可以根据自己的需要修改或扩展这个示例代码。