SELECT * FROM your_table WHERE your_date_column = TO_DATE('2023-40-01', 'YYYY-MM-DD');

SELECT * FROM your_table WHERE your_date_column = TO_DATE('2023-04-01', 'YYYY-MM-DD');

from django.contrib.auth import authenticate, login
from django.contrib.auth.forms import AuthenticationForm
from django.shortcuts import render

def custom_login(request):
    if request.method == 'POST':
        form = AuthenticationForm(data=request.POST)
        if form.is_valid():
            user = authenticate(username=form.cleaned_data.get('username'),
                                password=form.cleaned_data.get('password'))
            if user is not None:
                login(request, user)
                return render(request, 'logged_in.html')  # 重定向到登录后的页面
    else:
        form = AuthenticationForm()
    return render(request, 'login.html', {'form': form})

<form method="post" action="{% url 'login' %}">
    {% csrf_token %}
    {{ form.as_p }}
    <button type="submit">Log in</button>
</form>

<p>You are logged in!</p>

from django.urls import path
from .views import custom_login

urlpatterns = [
    # ... 其他 URL 配置 ...
    path('login/', custom_login, name='login'),
]

-- 创建数据库
CREATE DATABASE mydatabase;

-- 创建表
CREATE TABLE mytable (
  id INT PRIMARY KEY,
  name VARCHAR(50),
  age INT
);

-- 修改表结构
ALTER TABLE mytable ADD COLUMN email VARCHAR(100);

-- 删除表
DROP TABLE mytable;

-- 插入数据
INSERT INTO mytable (id, name, age) VALUES (1, 'Alice', 25);

-- 更新数据
UPDATE mytable SET age = 26 WHERE id = 1;

-- 删除数据
DELETE FROM mytable WHERE id = 1;

-- 查询数据
SELECT * FROM mytable;

-- 授权用户
GRANT SELECT, INSERT ON mydatabase.* TO 'user'@'localhost';

-- 撤销权限
REVOKE INSERT ON mydatabase.* FROM 'user'@'localhost';

-- 计算总数
SELECT COUNT(*) FROM mytable;

-- 计算年龄总和
SELECT SUM(age) FROM mytable;

-- 计算平均年龄
SELECT AVG(age) FROM mytable;

import psycopg2

# 连接到PostgreSQL数据库
conn = psycopg2.connect(
    dbname="your_db_name",
    user="your_username",
    password="your_password",
    host="your_host"
)

# 创建一个cursor对象以执行SQL命令
cur = conn.cursor()

# 创建BIM数据表
cur.execute("""
CREATE TABLE IF NOT EXISTS bim_data (
    id SERIAL PRIMARY KEY,
    object_id VARCHAR(255) NOT NULL,
    object_type VARCHAR(255) NOT NULL,
    data JSONB NOT NULL
);
""")

# 插入BIM数据
cur.execute("""
INSERT INTO bim_data (object_id, object_type, data)
VALUES (%s, %s, %s)
ON CONFLICT (object_id) DO UPDATE SET
    object_type = EXCLUDED.object_type,
    data = EXCLUDED.data;
""",
            ('unique_identifier', 'Space', '{"name": "My Room", "area": 100}'))

# 查询BIM数据
cur.execute("SELECT * FROM bim_data WHERE object_id = %s", ('unique_identifier',))
rows = cur.fetchall()
for row in rows:
    print(row)

# 提交事务并关闭cursor和connection
conn.commit()
cur.close()
conn.close()

SELECT value AS diag_trace_location
FROM v$diag_info
WHERE name = 'Diag Trace';

import os

# 获取Oracle诊断文件路径
diag_trace_location = os.popen('sqlplus -S / as sysdba <<EOF\nSET HEADING OFF;\nSET FEEDBACK OFF;\nSELECT value FROM v\\$diag_info WHERE name = 'Diag Trace';\nEXIT;\nEOF').read().strip()

# 读取诊断文件
with open(os.path.join(diag_trace_location, 'alert_your_dbname.log'), 'r') as file:
    print(file.read())

pip install cx_Oracle pymysql

import cx_Oracle
import pymysql

# 连接Oracle数据库
oracle_conn = cx_Oracle.connect('username/password@localhost/orcl')
oracle_cursor = oracle_conn.cursor()

# 连接MySQL数据库
mysql_conn = pymysql.connect(host='localhost', user='root', password='password', db='testdb')
mysql_cursor = mysql_conn.cursor()

# 查询Oracle数据库
oracle_cursor.execute("SELECT * FROM employees WHERE rownum <= 5")
for row in oracle_cursor:
    print(row)

# 查询MySQL数据库
mysql_cursor.execute("SELECT * FROM users WHERE id <= 5")
for row in mysql_cursor:
    print(row)

# 关闭游标和连接
oracle_cursor.close()
oracle_conn.close()
mysql_cursor.close()
mysql_conn.close()

import sqlite3

# 连接到SQLite数据库
# 数据库文件是 test.db，如果文件不存在，会自动在当前目录创建:
conn = sqlite3.connect('test.db')

# 创建一个Cursor:
cursor = conn.cursor()

# 执行一条SQL语句，创建user表:
cursor.execute('CREATE TABLE IF NOT EXISTS user (id VARCHAR(20) PRIMARY KEY, name VARCHAR(20))')

# 关闭Cursor:
cursor.close()

# 使用INSERT语句向表中插入记录:
conn.execute('INSERT INTO user (id, name) VALUES (\'1\', \'Michael\')')
conn.execute('INSERT INTO user (id, name) VALUES (\'2\', \'John\')')
conn.execute('INSERT INTO user (id, name) VALUES (\'3\', \'Sarah\')')

# 使用COMMIT语句保存对数据库所做的更改:
conn.commit()

# 关闭连接:
conn.close()

pip install django-simple-captcha

INSTALLED_APPS = [
    # ...
    'captcha',
]

python manage.py migrate captcha

from django import forms
from captcha.fields import CaptchaField

class ContactForm(forms.Form):
    # ... 其他字段 ...
    captcha = CaptchaField()

from django.shortcuts import render
from .forms import ContactForm

def contact(request):
    if request.method == 'POST':
        form = ContactForm(request.POST)
        if form.is_valid():
            # 表单验证通过，处理后续逻辑
            pass
    else:
        form = ContactForm()
    return render(request, 'contact.html', {'form': form})

<form method="post" action="{% url 'contact' %}">
    {% csrf_token %}
    {{ form.as_p }}
    <input type="submit" value="Submit">
</form>