feat: support literal in where options (#118)

README.md

@@ -201,7 +201,7 @@ const options = [{
     email: 'm@fengmk2_2.com',
     otherField: 'other field value2',
     modifiedAt: db.literals.now, // `now()` on db server
-  }, 
+  },
   where: {
     id: 124,
     name: 'fengmk2_2',
@@ -408,6 +408,12 @@ INSERT INTO `user` SET `name` = 'fengmk2', `createdAt` = now()
 const session = new db.literals.Literal('session()');
 ```
 
+```js
+const row = await db.get('table-name', { deletedAt: new db.literals.Literal('IS NOT NULL') });
+
+=> SELECT * FROM `table-name` WHERE `deletedAt` IS NOT NULL
+```
+
 ## Class Relation
 
 ```txt

src/operator.ts

@@ -366,6 +366,8 @@ export abstract class Operator {
       const value = where[key];
       if (Array.isArray(value)) {
         wheres.push('?? IN (?)');
+      } else if (value instanceof literals.Literal) {
+        wheres.push('?? ?');
       } else {
         if (value === null || value === undefined) {
           wheres.push('?? IS ?');

test/client.test.ts

@@ -81,7 +81,7 @@ describe('test/client.test.ts', () => {
 
   describe('query(), queryOne()', () => {
     before(async () => {
-      await db.query(`insert into ??(name, email, gmt_create, gmt_modified) 
+      await db.query(`insert into ??(name, email, gmt_create, gmt_modified)
         values(?, ?, now(), now())`, [ table, prefix + 'fengmk2', prefix + '[email protected]' ]);
       await db.query(`insert into ??(name, email, gmt_create, gmt_modified)
         values(?, ?, now(), now())`, [ table, prefix + 'fengmk3', prefix + '[email protected]' ]);

test/operator.test.ts

@@ -1,5 +1,6 @@
 import { strict as assert } from 'node:assert';
 import { Operator } from '../src/operator';
+import { Literal } from '../src/literals';
 
 class CustomOperator extends Operator {}
 
@@ -21,6 +22,7 @@ describe('test/operator.test.ts', () => {
       assert.equal(op._where({ id: 1, name: 'foo\'\"' }), ' WHERE `id` = 1 AND `name` = \'foo\\\'\\\"\'');
       assert.equal(op._where({ id: 1, name: 'foo\'\"', user: 'fengmk2' }),
         ' WHERE `id` = 1 AND `name` = \'foo\\\'\\\"\' AND `user` = \'fengmk2\'');
+      assert.equal(op._where({ name: new Literal('IS NOT NULL') }), ' WHERE `name` IS NOT NULL');
     });
   });