Add built-in database migration support

database/database.js

@@ -27,17 +27,40 @@ async function Initialize() {
 
 
 async function checkForDatabaseInitialization() {
-    const scoresSchemaExistsQuery = `SELECT schema_name FROM information_schema.schemata WHERE schema_name = 'scores'`;
-    let result = await executeQuery(scoresSchemaExistsQuery);
+    const databaseIsSetupQuery = `SELECT schema_name FROM information_schema.schemata WHERE schema_name = 'scores'`;
+    let result = await executeQuery(databaseIsSetupQuery);
     
-    const scoresSchemaExists = result.length !== 0;
+    const databaseIsSetup = result.length !== 0;
 
-    if(!scoresSchemaExists) {
+    if(!databaseIsSetup) {
         await Initialize();
     }
+
+
+    let latestMigration;
+    try {
+        const latestMigrationQuery = `SELECT value FROM metadata WHERE property = 'latest_migration';`;
+        latestMigration = (await executeQuery(latestMigrationQuery))[0][0];
+    } catch {
+        latestMigration = 0;
+    }
+
+
+    await performMigrations(latestMigration);
 }
 const initializationStatus = checkForDatabaseInitialization();
 
+async function performMigrations(currentMigration) {
+    const migrationFileList = fs.readdirSync('database/migrations');
+    const latestMigration = +migrationFileList[migrationFileList.length - 1].slice(0, 1);
+
+    for(let i = currentMigration + 1; i <= latestMigration; i++) {
+        const sql = fs.readFileSync(`database/migrations/${i}.sql`).toString();
+        await executeQuery(sql);
+        console.log(`Performed database migration ${i}`);
+    }
+}
+
 
 
 

database/migrations/1.sql

@@ -1,3 +1,5 @@
+/* ADD METADATA TABLE */
+
 BEGIN;
 
 CREATE TABLE IF NOT EXISTS metadata(
@@ -6,6 +8,6 @@ CREATE TABLE IF NOT EXISTS metadata(
 );
 
 INSERT INTO metadata(property, value)
-    VALUES("latest_migration", "1");
+    VALUES('latest_migration', '1');
 
 COMMIT;

database/migrations/2.sql

@@ -1,3 +1,5 @@
+/* ADD ACCOUNT NAME COLUMN */
+
 BEGIN;
 
 ALTER TABLE accounts.users
@@ -5,6 +7,6 @@ ADD COLUMN full_name TEXT;
 
 UPDATE metadata
 SET value = '2'
-WHERE property = "latest_migration";
+WHERE property = 'latest_migration';
 
 COMMIT;