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+# Use the official Python 3.10.9 image
+FROM python:3.12.7
+
+# Copy the current directory contents into the container at .
+COPY . .
+
+# Set the working directory to /
+WORKDIR /
+
+# Install requirements.txt 
+RUN pip install --no-cache-dir --upgrade -r /requirements.txt
+
+# Start the FastAPI app on port 7860, the default port expected by Spaces
+CMD ["uvicorn", "app:app", "--host", "0.0.0.0", "--port", "7860"]

app.py

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+#!/usr/bin/env python
+# coding: utf-8
+# # Bibliothek
+#!pip install PyMySQL
+
+
+import pprint
+import json
+import pymysql.cursors
+from fastapi import FastAPI
+from fastapi.responses import JSONResponse
+import os
+
+# Connect to the database
+connection = pymysql.connect(host='134.0.14.99',
+                            user='marcadm',
+                            password=os.environ['MURMEL_DB_PASSWORD'],
+                            database='murmel',
+                            cursorclass=pymysql.cursors.DictCursor)
+
+app = FastAPI()
+
+
+@app.get("/groups")
+def get_groups():
+    with connection.cursor() as cursor:
+        # Read a single record
+        sql = "SELECT Gruppe, idGruppe FROM `gruppe` WHERE aktuell is True ORDER BY idGruppe ASC;"
+        cursor.execute(sql, ())
+        result = cursor.fetchall()
+        #pprint.pprint(result)
+    return result
+
+@app.get("/students/{idGruppe}")
+def get_students(idGruppe):
+    with connection.cursor() as cursor:
+        #sql = "SELECT Gruppe, idGruppe FROM `gruppe` WHERE idGruppe=%s ORDER BY name ASC;"
+        sql = "select concat(`ki`.`Vorname`,' ',`ki`.`Nachnamen`) AS `Kind`, `ki`.`idKind` AS `idKind` from (((`kind` `ki` join `gruppe` `gr`) join `kind_x_gruppe_x_schuljahr` `kgs`) join `schuljahr` `sch`) where `ki`.`idKind` = `kgs`.`x_kind` and `sch`.`idschuljahr` = `kgs`.`x_schuljahr` and `gr`.`idGruppe` =  `kgs`.`x_gruppe` and `sch`.`aktuell` = 1 and (`gr`.`Gruppe` = %s or `gr`.`idGruppe` =  %s) order by 1"
+        cursor.execute(sql, (idGruppe,idGruppe))
+        result = cursor.fetchall()
+        #pprint.pprint(result)
+    return result
+
+@app.get("/return/{idBuch}")
+def rueckgabe(idBuch, grund='rueckgabe'):
+    """
+    Updates the database to mark a book as returned.
+
+    Parameters:
+    - idBuch (int): The ID of the book to be returned.
+    - grund (str): The reason for the return (default: 'rueckgabe').
+
+    Returns:
+    - int: 0 if the book was not found or already returned.
+
+    """
+    with connection.cursor() as cursor:
+        # check if the book is already returned
+        sql = "SELECT `idBuch`, `idKind`, `ausleihe`, `rueckgabe`, `rueckGrund` FROM `ausleihe` WHERE `idBuch` = %s AND `rueckgabe` is NULL;"
+        cursor.execute(sql, (idBuch,))
+        result = cursor.fetchall()
+        if len(result) == 0:
+            return 0
+        # return the book
+        sql = "UPDATE `ausleihe` SET `rueckgabe` = NOW(), `rueckGrund` = %s WHERE `idBuch` = %s AND `rueckgabe` is NULL;"
+        cursor.execute(sql, (grund, idBuch))
+        connection.commit()
+        #pprint.pprint(result)
+        # return if the book was returned or not and who had it before
+        return result
+
+@app.get("/borrow/{idBuch}/{idKind}")
+def ausleihe(idBuch, idKind):
+    """
+    Performs a book loan operation by inserting a new record into the 'ausleihe' table.
+
+    Parameters:
+    - idBuch (int): The ID of the book being loaned.
+    - idKind (int): The ID of the child borrowing the book.
+
+    Returns:
+    - rueckgabe_result (str): The result of the book return operation, indicating if the book was returned or not and who had it before, or if there was an error.
+    """
+    rueckgabe_result = rueckgabe(idBuch, grund="neu-ausleihe") # Buch kann nicht durch andere ausgeliehen sein        
+    sql = "INSERT INTO `ausleihe` (`idBuch`, `idKind`, `ausleihe`) VALUES (%s, %s, NOW());"
+    with connection.cursor() as cursor:
+        cursor.execute(sql, (idBuch, idKind))
+        connection.commit()
+        #pprint.pprint(result)
+    # return if the book was returned or not and who had it before or if there was an error
+    return rueckgabe_result
+    
+@app.get("/borrowed/{idKind}")
+def ausgeliehen(idKind):
+    """
+    Retrieves the books that are currently borrowed by a specific child.
+
+    Args:
+        idKind (int): The ID of the child.
+
+    Returns:
+        list: A list of tuples containing the book ID and the borrowing date for each book that is currently borrowed by the child.
+    """
+    with connection.cursor() as cursor:
+        sql = "SELECT `idBuch`, `ausleihe` FROM `ausleihe` WHERE `idKind` = %s AND `rueckgabe` IS NULL;"
+        cursor.execute(sql, (idKind,))
+        result = cursor.fetchall()
+        #pprint.pprint(result)
+    return result
+
+
+# run the app
+if __name__ == '__main__':
+    app.run(host='localhost', port=5000)
+
+# %%

index.html

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+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Library App</title>
+</head>
+<body>
+    <h1>Library App</h1>
+
+    <!-- Borrow a Book -->
+    <section id="borrow-section">
+        <h2>Borrow a Book</h2>
+        <button onclick="loadGroups('borrow')">Select Group</button>
+        <div id="borrow-controls" style="display: none;">
+            <select id="group-select-borrow" onchange="loadStudents('borrow')"></select>
+            <select id="student-select-borrow"></select>
+            <input type="text" id="book-id-borrow" placeholder="Enter Book ID">
+            <button onclick="borrowBook()">Borrow Book</button>
+        </div>
+        <div id="borrow-result"></div>
+    </section>
+
+    <!-- Return Books -->
+    <section id="return-section">
+        <h2>Return Books</h2>
+        <input type="text" id="book-id-return" placeholder="Enter Book ID">
+        <button onclick="returnBook()">Return Book</button>
+        <div id="return-result"></div>
+    </section>
+
+    <!-- List Outstanding Books -->
+    <section id="list-section">
+        <h2>List Outstanding Books</h2>
+        <button onclick="loadGroups('list')">Select Group</button>
+        <div id="list-controls" style="display: none;">
+            <select id="group-select-list" onchange="loadStudents('list')"></select>
+            <select id="student-select-list"></select>
+            <button onclick="listOutstandingBooks()">Show Outstanding Books</button>
+        </div>
+        <div id="list-result"></div>
+    </section>
+
+    <!-- Inventory -->
+    <section id="inventory-section">
+        <h2>Inventory</h2>
+        <input type="text" id="book-id-inventory" placeholder="Enter Book ID">
+        <button onclick="inventoryBook()">Inventory Book</button>
+        <div id="inventory-result"></div>
+    </section>
+
+    <script>
+        const apiUrl = 'http://localhost:8000'; // Replace with your actual API URL
+
+        // Load groups for selection
+        function loadGroups(mode) {
+            fetch(`${apiUrl}/groups`)
+                .then(response => response.json())
+                .then(groups => {
+                    let groupSelect = document.getElementById(`group-select-${mode}`);
+                    groupSelect.innerHTML = '<option value="">Select Group</option>';
+                    groups.forEach(group => {
+                        groupSelect.innerHTML += `<option value="${group.id}">${group.name}</option>`;
+                    });
+                    document.getElementById(`${mode}-controls`).style.display = 'block';
+                });
+        }
+
+        // Load students based on selected group
+        function loadStudents(mode) {
+            const groupId = document.getElementById(`group-select-${mode}`).value;
+            if (groupId) {
+                fetch(`${apiUrl}/students/${groupId}`)
+                    .then(response => response.json())
+                    .then(students => {
+                        let studentSelect = document.getElementById(`student-select-${mode}`);
+                        studentSelect.innerHTML = '<option value="">Select Student</option>';
+                        students.forEach(student => {
+                            studentSelect.innerHTML += `<option value="${student.id}">${student.name}</option>`;
+                        });
+                    });
+            }
+        }
+
+        // Borrow a book
+        function borrowBook() {
+            const studentId = document.getElementById('student-select-borrow').value;
+            const bookId = document.getElementById('book-id-borrow').value;
+            if (studentId && bookId) {
+                fetch(`${apiUrl}/borrow/${bookId}/${studentId}`)
+                    .then(response => response.json())
+                    .then(result => {
+                        document.getElementById('borrow-result').innerText = JSON.stringify(result);
+                    });
+            } else {
+                alert('Please select a student and enter a book ID.');
+            }
+        }
+
+        // Return a book
+        function returnBook() {
+            const bookId = document.getElementById('book-id-return').value;
+            if (bookId) {
+                fetch(`${apiUrl}/return/${bookId}?grund=rueckgabe`)
+                    .then(response => response.json())
+                    .then(result => {
+                        document.getElementById('return-result').innerText = JSON.stringify(result);
+                    });
+            } else {
+                alert('Please enter a book ID.');
+            }
+        }
+
+        // List outstanding books
+        function listOutstandingBooks() {
+            const studentId = document.getElementById('student-select-list').value;
+            if (studentId) {
+                fetch(`${apiUrl}/borrowed/${studentId}`)
+                    .then(response => response.json())
+                    .then(result => {
+                        document.getElementById('list-result').innerText = JSON.stringify(result);
+                    });
+            } else {
+                alert('Please select a student.');
+            }
+        }
+
+        // Inventory a book
+        function inventoryBook() {
+            const bookId = document.getElementById('book-id-inventory').value;
+            if (bookId) {
+                fetch(`${apiUrl}/return/${bookId}?grund=inventory`)
+                    .then(response => response.json())
+                    .then(result => {
+                        document.getElementById('inventory-result').innerText = JSON.stringify(result);
+                    });
+            } else {
+                alert('Please enter a book ID.');
+            }
+        }
+    </script>
+</body>
+</html>

requirements.txt

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+aiohttp==3.9.5
+aiosignal==1.3.1
+aiosqlite==0.20.0
+annotated-types==0.7.0
+anyio==4.3.0
+appnope==0.1.4
+argon2-cffi==23.1.0
+argon2-cffi-bindings==21.2.0
+arrow==1.3.0
+asttokens==2.4.1
+async-lru==2.0.4
+async-timeout==4.0.3
+attrs==23.2.0
+Babel==2.15.0
+beautifulsoup4==4.12.3
+bleach==6.1.0
+certifi==2024.2.2
+cffi==1.16.0
+charset-normalizer==3.3.2
+click==8.1.7
+cloudpickle==3.0.0
+comm==0.2.2
+contourpy==1.2.1
+cycler==0.12.1
+dask==2024.6.0
+dataclasses-json==0.6.7
+debugpy==1.8.1
+decorator==5.1.1
+deepmerge==1.1.1
+defusedxml==0.7.1
+distributed==2024.6.0
+dnspython==2.6.1
+email_validator==2.2.0
+exceptiongroup==1.2.1
+executing==2.0.1
+faiss-cpu==1.8.0
+fastapi==0.112.2
+fastapi-cli==0.0.5
+fastjsonschema==2.19.1
+fonttools==4.51.0
+fqdn==1.5.1
+frozenlist==1.4.1
+fsspec==2024.6.0
+h11==0.14.0
+httpcore==1.0.5
+httptools==0.6.1
+httpx==0.27.0
+idna==3.7
+importlib_metadata==7.1.0
+importlib_resources==6.4.0
+ipykernel==6.29.4
+ipython==8.18.1
+ipywidgets==8.1.2
+isoduration==20.11.0
+jedi==0.19.1
+Jinja2==3.1.4
+json5==0.9.25
+jsonpatch==1.33
+jsonpath-ng==1.6.1
+jsonpointer==2.4
+jsonschema==4.22.0
+jsonschema-specifications==2023.12.1
+jupyter==1.0.0
+jupyter-console==6.6.3
+jupyter-events==0.10.0
+jupyter-lsp==2.2.5
+jupyter_ai==2.17.0
+jupyter_ai_magics==2.17.0
+jupyter_client==8.6.1
+jupyter_core==5.7.2
+jupyter_server==2.14.0
+jupyter_server_terminals==0.5.3
+jupyterlab==4.1.8
+jupyterlab_pygments==0.3.0
+jupyterlab_server==2.27.1
+jupyterlab_widgets==3.0.10
+kiwisolver==1.4.5
+lab==8.2
+langchain==0.1.20
+langchain-community==0.0.38
+langchain-core==0.1.52
+langchain-text-splitters==0.0.2
+langsmith==0.1.77
+locket==1.0.0
+markdown-it-py==3.0.0
+MarkupSafe==2.1.5
+marshmallow==3.21.3
+matplotlib==3.8.4
+matplotlib-inline==0.1.7
+mdurl==0.1.2
+mistune==3.0.2
+msgpack==1.0.8
+multidict==6.0.5
+mypy-extensions==1.0.0
+nbclient==0.10.0
+nbconvert==7.16.4
+nbformat==5.10.4
+nest-asyncio==1.6.0
+notebook==7.1.3
+notebook_shim==0.2.4
+numpy==1.26.4
+orjson==3.10.5
+overrides==7.7.0
+packaging==23.2
+pandocfilters==1.5.1
+parso==0.8.4
+partd==1.4.2
+pexpect==4.9.0
+pillow==10.3.0
+platformdirs==4.2.1
+ply==3.11
+prometheus_client==0.20.0
+prompt-toolkit==3.0.43
+psutil==5.9.8
+ptyprocess==0.7.0
+pure-eval==0.2.2
+pycparser==2.22
+pydantic==2.7.4
+pydantic_core==2.18.4
+Pygments==2.18.0
+PyMySQL==1.1.0
+pyparsing==3.1.2
+python-dateutil==2.9.0.post0
+python-dotenv==1.0.1
+python-json-logger==2.0.7
+python-multipart==0.0.9
+PyYAML==6.0.1
+pyzmq==26.0.3
+qtconsole==5.5.2
+QtPy==2.4.1
+referencing==0.35.1
+requests==2.31.0
+rfc3339-validator==0.1.4
+rfc3986-validator==0.1.1
+rich==13.8.0
+rpds-py==0.18.1
+Send2Trash==1.8.3
+shellingham==1.5.4
+simplejson==3.19.2
+six==1.16.0
+sniffio==1.3.1
+sortedcontainers==2.4.0
+soupsieve==2.5
+SQLAlchemy==2.0.30
+stack-data==0.6.3
+starlette==0.38.4
+tblib==3.0.0
+tenacity==8.3.0
+terminado==0.18.1
+tinycss2==1.3.0
+tomli==2.0.1
+toolz==0.12.1
+tornado==6.4
+traitlets==5.14.3
+txt2tags==3.9
+typer==0.12.5
+types-python-dateutil==2.9.0.20240316
+typing-inspect==0.9.0
+typing_extensions==4.11.0
+uri-template==1.3.0
+urllib3==2.2.1
+uvicorn==0.30.6
+uvloop==0.20.0
+watchfiles==0.24.0
+wcwidth==0.2.13
+webcolors==1.13
+webencodings==0.5.1
+websocket-client==1.8.0
+websockets==13.0.1
+widgetsnbextension==4.0.10
+yarl==1.9.4
+zict==3.0.0
+zipp==3.18.1