javascript: Implement transactions API

bindings/javascript/compat.ts

@@ -38,6 +38,7 @@ class Database {
   db: NativeDB;
   memory: boolean;
   open: boolean;
+  private _inTransaction: boolean = false;
 
   /**
    * Creates a new database connection. If the database file pointed to by `path` does not exists, it will be created.
@@ -61,9 +62,7 @@ class Database {
 
     Object.defineProperties(this, {
       inTransaction: {
-        get() {
-          throw new Error("not implemented");
-        },
+        get: () => this._inTransaction,
       },
       name: {
         get() {
@@ -117,12 +116,15 @@ class Database {
     const wrapTxn = (mode) => {
       return (...bindParameters) => {
         db.exec("BEGIN " + mode);
+        db._inTransaction = true;
         try {
           const result = fn(...bindParameters);
           db.exec("COMMIT");
+          db._inTransaction = false;
           return result;
         } catch (err) {
           db.exec("ROLLBACK");
+          db._inTransaction = false;
           throw err;
         }
       };

bindings/javascript/promise.ts

@@ -38,6 +38,7 @@ class Database {
   db: NativeDB;
   memory: boolean;
   open: boolean;
+  private _inTransaction: boolean = false;
   /**
    * Creates a new database connection. If the database file pointed to by `path` does not exists, it will be created.
    *
@@ -65,9 +66,7 @@ class Database {
     this.memory = db.memory;
     Object.defineProperties(this, {
       inTransaction: {
-        get() {
-          throw new Error("not implemented");
-        },
+        get: () => this._inTransaction,
       },
       name: {
         get() {
@@ -121,12 +120,15 @@ class Database {
     const wrapTxn = (mode) => {
       return (...bindParameters) => {
         db.exec("BEGIN " + mode);
+        db._inTransaction = true;
         try {
           const result = fn(...bindParameters);
           db.exec("COMMIT");
+          db._inTransaction = false;
           return result;
         } catch (err) {
           db.exec("ROLLBACK");
+          db._inTransaction = false;
           throw err;
         }
       };

packages/turso-serverless/src/connection.ts

@@ -17,6 +17,7 @@ export class Connection {
   private session: Session;
   private isOpen: boolean = true;
   private defaultSafeIntegerMode: boolean = false;
+  private _inTransaction: boolean = false;
 
   constructor(config: Config) {
     if (!config.url) {
@@ -24,6 +25,19 @@ export class Connection {
     }
     this.config = config;
     this.session = new Session(config);
+    
+    // Define inTransaction property
+    Object.defineProperty(this, 'inTransaction', {
+      get: () => this._inTransaction,
+      enumerable: true
+    });
+  }
+
+  /**
+   * Whether the database is currently in a transaction.
+   */
+  get inTransaction(): boolean {
+    return this._inTransaction;
   }
 
   /**
@@ -143,6 +157,63 @@ export class Connection {
     this.defaultSafeIntegerMode = toggle === false ? false : true;
   }
 
+  /**
+   * Returns a function that executes the given function in a transaction.
+   * 
+   * @param fn - The function to wrap in a transaction
+   * @returns A function that will execute fn within a transaction
+   * 
+   * @example
+   * ```typescript
+   * const insert = await client.prepare("INSERT INTO users (name) VALUES (?)");
+   * const insertMany = client.transaction((users) => {
+   *   for (const user of users) {
+   *     insert.run([user]);
+   *   }
+   * });
+   * 
+   * await insertMany(['Alice', 'Bob', 'Charlie']);
+   * ```
+   */
+  transaction(fn: (...args: any[]) => any): any {
+    if (typeof fn !== "function") {
+      throw new TypeError("Expected first argument to be a function");
+    }
+
+    const db = this;
+    const wrapTxn = (mode: string) => {
+      return async (...bindParameters: any[]) => {
+        await db.exec("BEGIN " + mode);
+        db._inTransaction = true;
+        try {
+          const result = await fn(...bindParameters);
+          await db.exec("COMMIT");
+          db._inTransaction = false;
+          return result;
+        } catch (err) {
+          await db.exec("ROLLBACK");
+          db._inTransaction = false;
+          throw err;
+        }
+      };
+    };
+
+    const properties = {
+      default: { value: wrapTxn("") },
+      deferred: { value: wrapTxn("DEFERRED") },
+      immediate: { value: wrapTxn("IMMEDIATE") },
+      exclusive: { value: wrapTxn("EXCLUSIVE") },
+      database: { value: this, enumerable: true },
+    };
+
+    Object.defineProperties(properties.default.value, properties);
+    Object.defineProperties(properties.deferred.value, properties);
+    Object.defineProperties(properties.immediate.value, properties);
+    Object.defineProperties(properties.exclusive.value, properties);
+    
+    return properties.default.value;
+  }
+
   /**
    * Close the connection.
    * 

testing/javascript/__test__/async.test.js

@@ -145,16 +145,16 @@ test.serial("Database.pragma() after close()", async (t) => {
 // Database.transaction()
 // ==========================================================================
 
-test.skip("Database.transaction()", async (t) => {
+test.serial("Database.transaction()", async (t) => {
   const db = t.context.db;
 
   const insert = await db.prepare(
     "INSERT INTO users(name, email) VALUES (:name, :email)"
   );
 
-  const insertMany = db.transaction((users) => {
+  const insertMany = db.transaction(async (users) => {
     t.is(db.inTransaction, true);
-    for (const user of users) insert.run(user);
+    for (const user of users) await insert.run(user);
   });
 
   t.is(db.inTransaction, false);
@@ -166,12 +166,12 @@ test.skip("Database.transaction()", async (t) => {
   t.is(db.inTransaction, false);
 
   const stmt = await db.prepare("SELECT * FROM users WHERE id = ?");
-  t.is(stmt.get(3).name, "Joey");
-  t.is(stmt.get(4).name, "Sally");
-  t.is(stmt.get(5).name, "Junior");
+  t.is((await stmt.get(3)).name, "Joey");
+  t.is((await stmt.get(4)).name, "Sally");
+  t.is((await stmt.get(5)).name, "Junior");
 });
 
-test.skip("Database.transaction().immediate()", async (t) => {
+test.serial("Database.transaction().immediate()", async (t) => {
   const db = t.context.db;
   const insert = await db.prepare(
     "INSERT INTO users(name, email) VALUES (:name, :email)"

testing/javascript/__test__/sync.test.js

@@ -138,7 +138,7 @@ test.serial("Database.pragma() after close()", async (t) => {
 // Database.transaction()
 // ==========================================================================
 
-test.skip("Database.transaction()", async (t) => {
+test.serial("Database.transaction()", async (t) => {
   const db = t.context.db;
 
   const insert = db.prepare(
@@ -164,7 +164,7 @@ test.skip("Database.transaction()", async (t) => {
   t.is(stmt.get(5).name, "Junior");
 });
 
-test.skip("Database.transaction().immediate()", async (t) => {
+test.serial("Database.transaction().immediate()", async (t) => {
   const db = t.context.db;
   const insert = db.prepare(
     "INSERT INTO users(name, email) VALUES (:name, :email)"