feat: basic database setup

.gitignore

@@ -94,3 +94,4 @@ coverage/
 
 # Misc
 *.local
+.env

app.code-workspace

@@ -0,0 +1,12 @@
+{
+	"_comment": "Datei wurde mit absicht commited - öffne das Project als workspace und nicht als normalen Ordner für Intellisense usw",
+	"folders": [
+		{
+			"path": "backend"
+		},
+		{
+			"path": "frontend"
+		}
+	],
+	"settings": {}
+}

backend/package-lock.json

@@ -0,0 +1,160 @@
+{
+  "name": "backend",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "backend",
+      "version": "1.0.0",
+      "license": "MIT",
+      "dependencies": {
+        "dotenv": "^17.2.2",
+        "mysql2": "^3.14.5"
+      }
+    },
+    "node_modules/aws-ssl-profiles": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/aws-ssl-profiles/-/aws-ssl-profiles-1.1.2.tgz",
+      "integrity": "sha512-NZKeq9AfyQvEeNlN0zSYAaWrmBffJh3IELMZfRpJVWgrpEbtEpnjvzqBPf+mxoI287JohRDoa+/nsfqqiZmF6g==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 6.0.0"
+      }
+    },
+    "node_modules/denque": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/denque/-/denque-2.1.0.tgz",
+      "integrity": "sha512-HVQE3AAb/pxF8fQAoiqpvg9i3evqug3hoiwakOyZAwJm+6vZehbkYXZ0l4JxS+I3QxM97v5aaRNhj8v5oBhekw==",
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=0.10"
+      }
+    },
+    "node_modules/dotenv": {
+      "version": "17.2.2",
+      "resolved": "https://registry.npmjs.org/dotenv/-/dotenv-17.2.2.tgz",
+      "integrity": "sha512-Sf2LSQP+bOlhKWWyhFsn0UsfdK/kCWRv1iuA2gXAwt3dyNabr6QSj00I2V10pidqz69soatm9ZwZvpQMTIOd5Q==",
+      "license": "BSD-2-Clause",
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://dotenvx.com"
+      }
+    },
+    "node_modules/generate-function": {
+      "version": "2.3.1",
+      "resolved": "https://registry.npmjs.org/generate-function/-/generate-function-2.3.1.tgz",
+      "integrity": "sha512-eeB5GfMNeevm/GRYq20ShmsaGcmI81kIX2K9XQx5miC8KdHaC6Jm0qQ8ZNeGOi7wYB8OsdxKs+Y2oVuTFuVwKQ==",
+      "license": "MIT",
+      "dependencies": {
+        "is-property": "^1.0.2"
+      }
+    },
+    "node_modules/iconv-lite": {
+      "version": "0.7.0",
+      "resolved": "https://registry.npmjs.org/iconv-lite/-/iconv-lite-0.7.0.tgz",
+      "integrity": "sha512-cf6L2Ds3h57VVmkZe+Pn+5APsT7FpqJtEhhieDCvrE2MK5Qk9MyffgQyuxQTm6BChfeZNtcOLHp9IcWRVcIcBQ==",
+      "license": "MIT",
+      "dependencies": {
+        "safer-buffer": ">= 2.1.2 < 3.0.0"
+      },
+      "engines": {
+        "node": ">=0.10.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
+      }
+    },
+    "node_modules/is-property": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/is-property/-/is-property-1.0.2.tgz",
+      "integrity": "sha512-Ks/IoX00TtClbGQr4TWXemAnktAQvYB7HzcCxDGqEZU6oCmb2INHuOoKxbtR+HFkmYWBKv/dOZtGRiAjDhj92g==",
+      "license": "MIT"
+    },
+    "node_modules/long": {
+      "version": "5.3.2",
+      "resolved": "https://registry.npmjs.org/long/-/long-5.3.2.tgz",
+      "integrity": "sha512-mNAgZ1GmyNhD7AuqnTG3/VQ26o760+ZYBPKjPvugO8+nLbYfX6TVpJPseBvopbdY+qpZ/lKUnmEc1LeZYS3QAA==",
+      "license": "Apache-2.0"
+    },
+    "node_modules/lru-cache": {
+      "version": "7.18.3",
+      "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-7.18.3.tgz",
+      "integrity": "sha512-jumlc0BIUrS3qJGgIkWZsyfAM7NCWiBcCDhnd+3NNM5KbBmLTgHVfWBcg6W+rLUsIpzpERPsvwUP7CckAQSOoA==",
+      "license": "ISC",
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/lru.min": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/lru.min/-/lru.min-1.1.2.tgz",
+      "integrity": "sha512-Nv9KddBcQSlQopmBHXSsZVY5xsdlZkdH/Iey0BlcBYggMd4two7cZnKOK9vmy3nY0O5RGH99z1PCeTpPqszUYg==",
+      "license": "MIT",
+      "engines": {
+        "bun": ">=1.0.0",
+        "deno": ">=1.30.0",
+        "node": ">=8.0.0"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/wellwelwel"
+      }
+    },
+    "node_modules/mysql2": {
+      "version": "3.14.5",
+      "resolved": "https://registry.npmjs.org/mysql2/-/mysql2-3.14.5.tgz",
+      "integrity": "sha512-40hDf8LPUsuuJ2hFq+UgOuPwt2IFLIRDvMv6ez9hKbXeYuZPxDDwiJW7KdknvOsQqKznaKczOT1kELgFkhDvFg==",
+      "license": "MIT",
+      "dependencies": {
+        "aws-ssl-profiles": "^1.1.1",
+        "denque": "^2.1.0",
+        "generate-function": "^2.3.1",
+        "iconv-lite": "^0.7.0",
+        "long": "^5.2.1",
+        "lru.min": "^1.0.0",
+        "named-placeholders": "^1.1.3",
+        "seq-queue": "^0.0.5",
+        "sqlstring": "^2.3.2"
+      },
+      "engines": {
+        "node": ">= 8.0"
+      }
+    },
+    "node_modules/named-placeholders": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/named-placeholders/-/named-placeholders-1.1.3.tgz",
+      "integrity": "sha512-eLoBxg6wE/rZkJPhU/xRX1WTpkFEwDJEN96oxFrTsqBdbT5ec295Q+CoHrL9IT0DipqKhmGcaZmwOt8OON5x1w==",
+      "license": "MIT",
+      "dependencies": {
+        "lru-cache": "^7.14.1"
+      },
+      "engines": {
+        "node": ">=12.0.0"
+      }
+    },
+    "node_modules/safer-buffer": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/safer-buffer/-/safer-buffer-2.1.2.tgz",
+      "integrity": "sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg==",
+      "license": "MIT"
+    },
+    "node_modules/seq-queue": {
+      "version": "0.0.5",
+      "resolved": "https://registry.npmjs.org/seq-queue/-/seq-queue-0.0.5.tgz",
+      "integrity": "sha512-hr3Wtp/GZIc/6DAGPDcV4/9WoZhjrkXsi5B/07QgX8tsdc6ilr7BFM6PM6rbdAX1kFSDYeZGLipIZZKyQP0O5Q=="
+    },
+    "node_modules/sqlstring": {
+      "version": "2.3.3",
+      "resolved": "https://registry.npmjs.org/sqlstring/-/sqlstring-2.3.3.tgz",
+      "integrity": "sha512-qC9iz2FlN7DQl3+wjwn3802RTyjCx7sDvfQEXchwa6CWOx07/WVfh91gBmQ9fahw8snwGEWU3xGzOt4tFyHLxg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.6"
+      }
+    }
+  }
+}

backend/package.json

@@ -8,5 +8,9 @@
   "main": "src/index.js",
   "scripts": {
     "start": "node src/index.js"
+  },
+  "dependencies": {
+    "dotenv": "^17.2.2",
+    "mysql2": "^3.14.5"
   }
 }

backend/src/db.js

@@ -0,0 +1,70 @@
+// copied from one of my older projects
+const mysql = require('mysql2/promise');
+
+function getEnvVar(name) {
+  const value = process.env[name];
+  if (value === null) {
+    throw new Error(`Environment variable ${name} is not defined`);
+  }
+  return value;
+}
+
+const pool = mysql.createPool({
+  host: getEnvVar('MYSQL_HOST'),
+  user: getEnvVar('MYSQL_USER'),
+  password: getEnvVar('MYSQL_PASSWORD'),
+  database: getEnvVar('MYSQL_DB'),
+});
+
+const migrations = [
+  {
+    name: "init_dart_table",
+    up: async (conn) => {
+      await conn.query(`
+        CREATE TABLE dart (
+          id INT PRIMARY KEY AUTO_INCREMENT
+        )
+      `);
+    }
+  }
+];
+
+async function initDB() {
+  await pool.query(`
+    CREATE TABLE IF NOT EXISTS migrations (
+      id INT PRIMARY KEY AUTO_INCREMENT,
+      name VARCHAR(255) NOT NULL UNIQUE
+    );
+  `);
+
+  for (const m of migrations) {
+    const conn = await pool.getConnection();
+
+    try {
+      await conn.beginTransaction();
+
+      const [rows] = await conn.query(
+        `SELECT 1 FROM migrations WHERE name = ? LIMIT 1 FOR UPDATE`,
+        [m.name]
+      );
+
+      if (rows.length === 0) {
+        console.log(`Running migration: ${m.name}`);
+        await m.up(conn);
+        await conn.query(`INSERT INTO migrations (name) VALUES (?)`, [m.name]);
+      }
+
+      await conn.commit();
+    } catch (err) {
+      await conn.rollback();
+      throw err;
+    } finally {
+      conn.release();
+    }
+  }
+}
+
+module.exports = {
+  pool,
+  initDB
+};

backend/src/index.js

@@ -0,0 +1,4 @@
+require('dotenv').config()
+const db = require('./db');
+
+db.initDB();