doc(README.md) add missing doc entries

README.md

@@ -68,6 +68,9 @@ composer require stellarwp/db
 - [Inherited from `$wpdb`](#inherited-from-wpdb)
   - [`get_var()`](#get_var)
   - [`get_col()`](#get_col)
+  - [`generate_col()`](#get_col)
+  - [`get_results()`](#get_results)
+  - [`generate_results()`](#generate_results)
   - [`esc_like()`](#esc_like)
   - [`remove_placeholder_escape()`](#remove_placeholder_escape)
 
@@ -930,6 +933,55 @@ $meta_values = DB::get_col(
 );
 ```
 
+### `generate_col()`
+
+Returns a Generator that will produce an array of values for the column for the given query.  
+Differrently from the `get_col()` method, this method will run unbounded queries (queries without a `LIMIT` set) in batches, ensuring as-efficient-as-possible use of the database and memory.
+
+```php
+$meta_values = DB::generate_col(
+	DB::table( 'postmeta' )
+		->select( 'meta_value' )
+		->where( 'meta_key', 'some_key' )
+		->getSQL()
+);
+
+foreach( $meta_values as $meta_value ) {
+    // Do something with the meta value.
+}
+```
+
+### `get_results()`
+
+Returns an array of rows for for the given query.
+
+```php
+$private_posts = DB::get_results(
+	DB::table( 'posts' )
+		->select( '*' )
+		->where( 'post_status', 'private' )
+		->getSQL()
+);
+```
+
+### `generate_results()`
+
+Returns a Generator that will produce an array of rows for the given query.  
+Differrently from the `get_results()` method, this method will run unbounded queries (queries without a `LIMIT` set) in batches, ensuring as-efficient-as-possible use of the database and memory.
+
+```php
+$private_posts = DB::generate_results(
+	DB::table( 'posts' )
+		->select( '*' )
+		->where( 'post_status', 'private' )
+		->getSQL()
+);
+
+foreach( $private_posts as $private_post ) {
+    // Do something with the post.
+}
+```
+
 ### `esc_like()`
 
 Escapes a string with a percent sign in it so it can be safely used with [Where LIKE](#where-like-clauses) without the percent sign being interpreted as a wildcard character.