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| import random
from flask import Blueprint, render_template, request, url_for, redirect
from app.models import Student, db
from sqlalchemy import and_, not_, or_
blue = Blueprint('app', __name__)
@blue.route('/')
def hello():
return 'hello'
@blue.route('/list/', methods=['GET'])
def stu_list():
# students = Student.query.all()
# 分页
# pre_page:一页多少条
page = int(request.args.get('page', 1))
pre_page = 5
paginate = Student.query.paginate(page, pre_page)
# paginate.items 获取当前页面的内容
students = paginate.items
return render_template('list.html', paginate=paginate, students=students)
@blue.route('/add/', methods=['GET', 'POST'])
def stu_add():
if request.method == 'GET':
return render_template('add.html')
if request.method == 'POST':
# 创建学生信息
# 1.获取数据
username = request.form.get('username')
phone = request.form.get('phone')
age = request.form.get('age')
# 2.保存
stu = Student()
stu.s_name = username
stu.s_phone = phone
stu.s_age = age
db.session.add(stu)
db.session.commit()
return redirect(url_for('app.stu_list'))
@blue.route('/edit/<int:id>/', methods=['GET', 'POST'])
def stu_edit(id):
if request.method == 'GET':
# stu = Student.query.filter(Student.id == id).first()
stu = Student.query.filter_by(id=id).first()
return render_template('add.html', stu=stu)
if request.method == 'POST':
# 1.获取页面的参数
username = request.form.get('username')
phone = request.form.get('phone')
age = request.form.get('age')
# 2.获取对象
# stu = Student.query.filter(Student.id == id).first()
stu = Student.query.filter_by(id=id).first()
# 3.修改属性
stu.s_name = username
stu.s_phone = phone
stu.s_age = age
db.session.add(stu)
db.session.commit()
return redirect(url_for('app.stu_list'))
@blue.route('/del/<int:id>/', methods=['GET'])
def stu_del(id):
if request.method == 'GET':
# 获取删除对象
# stu = Student.query.filter(Student.id == id).first()
stu = Student.query.filter_by(id=id).first()
# 使用delete(对象)
db.session.delete(stu)
db.session.commit()
return redirect(url_for('app.stu_list'))
@blue.route('/add_all/', methods=['GET'])
# 批量创建
def add_all():
stus = []
for i in range(10):
stu = Student()
stu.s_age = random.randint(18,28)
stu.s_name = '小明%s' % random.randint(0,10000)
stu.s_phone = '12345678911'
stus.append(stu)
# db.session.add(stu)
db.session.add_all(stus)
db.session.commit()
return '创建成功'
@blue.route('/change_stu/', methods=['GET'])
# 修改时db.session.add(对象)可以不用写
def change_stu():
stu = Student.query.filter(Student.id == 8).first()
stu.s_name = '小花'
# db.session.add(stu)
db.session.commit()
return '修改成功'
@blue.route('sel_stu', methods=['GET'])
def sel_stu():
# 查询id为6的信息
# first(): 获取第一个
stu = Student.query.filter(Student.id == 3).first()
stu = Student.query.filter_by(id=3).first()
# get(主键)：只能获取主键那一行的信息
stu = Student.query.get(5)
# 查询所有数据
# all()返回所有数据的列表结果
stus = Student.query.all()
# 排序:升序
stus = Student.query.order_by('s_age')
stus = Student.query.order_by('s_age asc')
# 排序：降序
stus = Student.query.order_by('-s_age')
stus = Student.query.order_by('s_age desc')
# 实现分页 offset(跳过几个参数) limit(截取几条数据):
stu = Student.query.offset(0).limit(2)
# 模糊查询contains
stus = Student.query.filter(Student.s_name.contains('小花')).all()
# 以小开头的学生信息 startswith
stus = Student.query.filter(Student.s_name.startswith('小')).all()
# 以3结尾的学生信息
stus = Student.query.filter(Student.s_name.endswith('3')).all()
# 第二位为‘明’ 的学生信息, like '_明%'
stus = Student.query.filter(Student.s_name.like('_明%')).all()
# 查询id为1,2,3，4,5,的学生信息 in_([1,2,3,4,5])
stus = Student.query.filter(Student.id.in_([1, 2, 3, 4, 5]))
# 查询年龄小于21的信息
# 小于/小于等于 lt le 大于/大于等于 gt/ge
stus = Student.query.filter(Student.s_age.__le__(21)).all()
stus = Student.query.filter(Student.s_age <= 21).all()
# 查询年龄小于22且姓名以6结束
stus = Student.query.filter(Student.s_age<22).filter(Student.s_name.endswith('6')).all()
stus = Student.query.filter(Student.s_age<22, Student.s_name.endswith('6')).all()
# and_
stus = Student.query.filter(and_(Student.s_age < 22, Student.s_name.endswith('6'))).all()
# or_
stus = Student.query.filter(or_(Student.s_age < 22, Student.s_name.endswith('6'))).all()
# not_
stus = Student.query.filter(not_(Student.s_age < 22)).all()
# 分页
stus = Student.query.paginate(1, 5)
names = [stu.s_name for stu in stus]
print(names)
return '查询成功'
|