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@@ -0,0 +1,110 @@
+```
+import streamlit as st
+import pandas as pd
+import sqlite3
+
+st.set_page_config(page_title="图书管理系统")
+
+def init_db():
+    conn = sqlite3.connect('library.db')
+    conn.execute("""
+        CREATE TABLE IF NOT EXISTS books(
+        id INTEGER PRIMARY KEY AUTOINCREMENT,
+        book_name TEXT NOT NULL,
+        author TEXT NOT NULL,
+        price REAL NOT NULL
+        )
+    """)
+    conn.commit()
+    conn.close()
+def add_book(book_name, author, price):
+    conn = sqlite3.connect('library.db')
+    conn.execute(
+        "INSERT INTO books (book_name, author, price) VALUES (?, ?, ?)",
+        (book_name, author, price)
+    )
+    conn.commit()
+    conn.close()
+def delete_book(id):
+    # 3.1.创建连接
+    conn = sqlite3.connect("library.db")
+    # 3.2.执行SQL
+    conn.execute("delete from books where id = ?", (id,))
+    # 3.3.提交 
+    conn.commit()
+    # 3.4.关闭连接
+    conn.close()
+# 查询所有图书
+def show_books():
+    conn = sqlite3.connect('library.db')
+    data = conn.execute("SELECT * FROM books")
+    df = pd.DataFrame(data, columns=["id", "book_name", "author", "price"])
+    conn.close()
+    return df
+
+# 初始化数据表
+init_db()
+
+# 登录状态
+if "logged_in" not in st.session_state:
+    st.session_state.logged_in = False
+
+# 登录页面
+if not st.session_state.logged_in:
+    st.title("图书管理系统")
+    st.subheader("用户登录")
+    with st.form("login_form"):
+        username = st.text_input("用户名", placeholder="请输入用户名")
+        password = st.text_input("密码", placeholder="请输入密码", type="password")
+        login_btn = st.form_submit_button("登录", use_container_width=True)
+        if login_btn:
+            if username == "admin" and password == "666":
+                st.session_state.logged_in = True
+                st.success("登录成功！")
+                st.rerun()
+            else:
+                st.error("用户名或密码错误！")
+    st.stop()
+
+# 登录后侧边菜单
+with st.sidebar:
+    st.title("=== 菜单 ===")
+    st.markdown("---")
+    menu = st.selectbox("请选择功能", ["查看所有图书", "添加图书"])
+
+if menu == "查看所有图书":
+    st.title("📚 图书列表")
+    st.markdown("---")
+    books = show_books()
+    if len(books)>0:
+        cols = st.columns([1,5,3,1,2])
+        cols[0].write("序号")
+        cols[1].write("书名")
+        cols[2].write("作者")
+        cols[3].write("价格")
+        cols[4].write("操作")
+        for idx, book in books.iterrows():
+            cols = st.columns([1,5,3,1,2])
+            cols[0].write(idx + 1)
+            cols[1].write(book["book_name"])
+            cols[2].write(book["author"])
+            cols[3].write(book["price"])
+            cols[4].button("删除",key=f"{idx}",on_click=delete_book,args=(book["id"],))
+
+elif menu == "添加图书":
+    st.title(" 添加新图书")
+    st.markdown("---")
+    with st.form("add_book_form", clear_on_submit=True):
+        name = st.text_input("书名")
+        author = st.text_input("作者")
+        price = st.number_input("价格")
+        submit = st.form_submit_button("提交添加")
+        if submit:
+            
+            if not name or not author:
+                st.warning("书名和作者不能为空！")
+            else:
+                add_book(name, author, price)
+                st.success("图书添加成功！")
+                st.rerun()
+```
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