Count method

CHANGELOG.md

@@ -2,6 +2,9 @@
 
 ## [Unreleased][unreleased]
 
+- New API methods for Database:
+  - async count(table, condition): number
+
 ## [1.1.5][] - 2021-07-04
 
 - Implement CRUD plugin

lib/database.js

@@ -173,6 +173,11 @@ class Database {
     return column;
   }
 
+  async count(table, ...conditions) {
+    const rows = await this.select(table, ...conditions);
+    return rows.length;
+  }
+
   async dict(table, fields, ...conditions) {
     const [keyField, valField] = fields;
     const obj = Object.create(null);

test/sql.js

@@ -124,6 +124,14 @@ metatests.test('Database.col', async (test) => {
   test.end();
 });
 
+metatests.test('Database.count', async (test) => {
+  const res1 = await db.count('Country');
+  test.strictEqual(res1, 4);
+  const res2 = await db.count('City', { name: 'Kiev' });
+  test.strictEqual(res2, 1);
+  test.end();
+});
+
 metatests.test('Database.dict', async (test) => {
   const res = await db.dict('City', ['name', 'countryId']);
   test.strictEqual(typeof res, 'object');

types/metasql.d.ts

@@ -1 +1,3 @@
-export class Database {}
+export class Database {
+  count(table: string, ...conditions: Array<object>): Promise<number>;
+}