added db functionality

frontend/learnlink/package-lock.json

@@ -12,6 +12,7 @@
         "@testing-library/jest-dom": "^6.6.3",
         "@testing-library/react": "^16.2.0",
         "@testing-library/user-event": "^13.5.0",
+        "neo4j-driver": "^5.28.1",
         "react": "^19.0.0",
         "react-dom": "^19.0.0",
         "react-scripts": "5.0.1",
@@ -5177,6 +5178,26 @@
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       "license": "MIT"
     },
+    "node_modules/base64-js": {
+      "version": "1.5.1",
+      "resolved": "https://registry.npmjs.org/base64-js/-/base64-js-1.5.1.tgz",
+      "integrity": "sha512-AKpaYlHn8t4SVbOHCy+b5+KKgvR4vrsD8vbvrbiQJps7fKDTkjkDry6ji0rUJjC0kzbNePLwzxq8iypo41qeWA==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/feross"
+        },
+        {
+          "type": "patreon",
+          "url": "https://www.patreon.com/feross"
+        },
+        {
+          "type": "consulting",
+          "url": "https://feross.org/support"
+        }
+      ],
+      "license": "MIT"
+    },
     "node_modules/batch": {
       "version": "0.6.1",
       "resolved": "https://registry.npmjs.org/batch/-/batch-0.6.1.tgz",
@@ -5362,6 +5383,30 @@
         "node-int64": "^0.4.0"
       }
     },
+    "node_modules/buffer": {
+      "version": "6.0.3",
+      "resolved": "https://registry.npmjs.org/buffer/-/buffer-6.0.3.tgz",
+      "integrity": "sha512-FTiCpNxtwiZZHEZbcbTIcZjERVICn9yq/pDFkTl95/AxzD1naBctN7YO68riM/gLSDY7sdrMby8hofADYuuqOA==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/feross"
+        },
+        {
+          "type": "patreon",
+          "url": "https://www.patreon.com/feross"
+        },
+        {
+          "type": "consulting",
+          "url": "https://feross.org/support"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "base64-js": "^1.3.1",
+        "ieee754": "^1.2.1"
+      }
+    },
     "node_modules/buffer-from": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/buffer-from/-/buffer-from-1.1.2.tgz",
@@ -9162,6 +9207,26 @@
         "node": ">=4"
       }
     },
+    "node_modules/ieee754": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/ieee754/-/ieee754-1.2.1.tgz",
+      "integrity": "sha512-dcyqhDvX1C46lXZcVqCpK+FtMRQVdIMN6/Df5js2zouUsqG7I6sFxitIC+7KYK29KdXOLHdu9zL4sFnoVQnqaA==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/feross"
+        },
+        {
+          "type": "patreon",
+          "url": "https://www.patreon.com/feross"
+        },
+        {
+          "type": "consulting",
+          "url": "https://feross.org/support"
+        }
+      ],
+      "license": "BSD-3-Clause"
+    },
     "node_modules/ignore": {
       "version": "5.3.2",
       "resolved": "https://registry.npmjs.org/ignore/-/ignore-5.3.2.tgz",
@@ -11558,6 +11623,34 @@
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       "license": "MIT"
     },
+    "node_modules/neo4j-driver": {
+      "version": "5.28.1",
+      "resolved": "https://registry.npmjs.org/neo4j-driver/-/neo4j-driver-5.28.1.tgz",
+      "integrity": "sha512-jbyBwyM0a3RLGcP43q3hIxPUPxA+1bE04RovOKdNAS42EtBMVCKcPSeOvWiHxgXp1ZFd0a8XqK+7LtguInOLUg==",
+      "license": "Apache-2.0",
+      "dependencies": {
+        "neo4j-driver-bolt-connection": "5.28.1",
+        "neo4j-driver-core": "5.28.1",
+        "rxjs": "^7.8.1"
+      }
+    },
+    "node_modules/neo4j-driver-bolt-connection": {
+      "version": "5.28.1",
+      "resolved": "https://registry.npmjs.org/neo4j-driver-bolt-connection/-/neo4j-driver-bolt-connection-5.28.1.tgz",
+      "integrity": "sha512-nY8GBhjOW7J0rDtpiyJn6kFdk2OiNVZZhZrO8//mwNXnf5VQJ6HqZQTDthH/9pEaX0Jvbastz1xU7ZL8xzqY0w==",
+      "license": "Apache-2.0",
+      "dependencies": {
+        "buffer": "^6.0.3",
+        "neo4j-driver-core": "5.28.1",
+        "string_decoder": "^1.3.0"
+      }
+    },
+    "node_modules/neo4j-driver-core": {
+      "version": "5.28.1",
+      "resolved": "https://registry.npmjs.org/neo4j-driver-core/-/neo4j-driver-core-5.28.1.tgz",
+      "integrity": "sha512-14vN8TlxC0JvJYfjWic5PwjsZ38loQLOKFTXwk4fWLTbCk6VhrhubB2Jsy9Rz+gM6PtTor4+6ClBEFDp1q/c8g==",
+      "license": "Apache-2.0"
+    },
     "node_modules/no-case": {
       "version": "3.0.4",
       "resolved": "https://registry.npmjs.org/no-case/-/no-case-3.0.4.tgz",
@@ -14471,6 +14564,15 @@
         "queue-microtask": "^1.2.2"
       }
     },
+    "node_modules/rxjs": {
+      "version": "7.8.2",
+      "resolved": "https://registry.npmjs.org/rxjs/-/rxjs-7.8.2.tgz",
+      "integrity": "sha512-dhKf903U/PQZY6boNNtAGdWbG85WAbjT/1xYoZIC7FAY0yWapOBQVsVrDl58W86//e1VpMNBtRV4MaXfdMySFA==",
+      "license": "Apache-2.0",
+      "dependencies": {
+        "tslib": "^2.1.0"
+      }
+    },
     "node_modules/safe-array-concat": {
       "version": "1.1.3",
       "resolved": "https://registry.npmjs.org/safe-array-concat/-/safe-array-concat-1.1.3.tgz",

frontend/learnlink/package.json

@@ -7,6 +7,7 @@
     "@testing-library/jest-dom": "^6.6.3",
     "@testing-library/react": "^16.2.0",
     "@testing-library/user-event": "^13.5.0",
+    "neo4j-driver": "^5.28.1",
     "react": "^19.0.0",
     "react-dom": "^19.0.0",
     "react-scripts": "5.0.1",

frontend/learnlink/src/App.js

 import logo from './logo.svg';
 import './App.css';
+import {getAllUsers} from './lib/db';
 
 function App() {
+
+  const onClick = async () => {
+    const data = await getAllUsers()
+    console.log(data)
+  }
+
   return (
     <div className="App">
-      <header className="App-header">
-        <img src={logo} className="App-logo" alt="logo" />
-        <p>
-          Edit <code>src/App.js</code> and save to reload.
-        </p>
-        <a
-          className="App-link"
-          href="https://reactjs.org"
-          target="_blank"
-          rel="noopener noreferrer"
-        >
-          Learn React
-        </a>
-      </header>
+      <button onClick={onClick}>Get User</button>
     </div>
   );
 }

frontend/learnlink/src/lib/db.js

+import neo4j from 'neo4j-driver';
+
+const uri = 'neo4j://localhost:7687'; // oder remote URI
+const user = 'neo4j';
+const password = 'sml12345';
+
+const driver = neo4j.driver(uri, neo4j.auth.basic(user, password));
+const session = driver.session({ database: 'learnlink' });
+
+export const createUser = async (id, name, email, location) => {
+    const query = `CREATE (u:User {id: $id, name: $name, email: $email, location: $location}) RETURN u`;
+    return session.run(query, { id, name, email, location });
+};
+
+export const createCompany = async (id, name) => {
+    const query = `CREATE (c:Company {id: $id, name: $name}) RETURN c`;
+    return session.run(query, { id, name });
+};
+
+export const createJob = async (id, title, location) => {
+    const query = `CREATE (j:Job {id: $id, title: $title, location: $location}) RETURN j`;
+    return session.run(query, { id, title, location });
+};
+
+export const updateUser = async (id, email, location) => {
+    const query = `MATCH (u:User {id: $id}) SET u.email = $email, u.location = $location RETURN u`;
+    return session.run(query, { id, email, location });
+};
+
+export const updateCompany = async (id, name, industry) => {
+    const query = `MATCH (c:Company {id: $id}) SET c.name = $name, c.industry = $industry RETURN c`;
+    return session.run(query, { id, name, industry });
+};
+
+export const updateJob = async (id, title, location) => {
+    const query = `MATCH (j:Job {id: $id}) SET j.title = $title, j.location = $location RETURN j`;
+    return session.run(query, { id, title, location });
+};
+
+export const deleteUser = async (id) => {
+    const query = `MATCH (u:User {id: $id}) DETACH DELETE u`;
+    return session.run(query, { id });
+};
+
+export const deleteCompany = async (id) => {
+    const query = `MATCH (c:Company {id: $id}) DETACH DELETE c`;
+    return session.run(query, { id });
+};
+
+export const deleteJob = async (id) => {
+    const query = `MATCH (j:Job {id: $id}) DETACH DELETE j`;
+    return session.run(query, { id });
+};
+
+export const getUser = async (name) => {
+    const query = `MATCH (u:User {name: $name}) RETURN u`;
+    return session.run(query, { name });
+};
+
+export const getAllUsers = async () => {
+    const query = `MATCH (u:User) RETURN u`;
+    return session.run(query);
+};
+
+export const getUserRelationships = async (name) => {
+    const query = `MATCH (u:User {name: $name})-[r]-() RETURN r`;
+    return session.run(query, { name });
+};
+
+export const getUserCompany = async (name) => {
+    const query = `MATCH (u:User {name: $name})-[:WORKS_FOR]->(c:Company) RETURN c`;
+    return session.run(query, { name });
+};
+
+export const getRemoteJobs = async () => {
+    const query = `MATCH (j:Job) WHERE j.location = 'Remote' RETURN j`;
+    return session.run(query);
+};
+
+export const closeConnection = () => {
+    session.close();
+    driver.close();
+};
\ No newline at end of file