feat: pass null to reset statements (#31)

README.md

@@ -5,10 +5,10 @@ This library provides abstraction methods for common operations on MySQL-like da
 For example:
 ```php
 MySQL->for(string $table)
-  ->with(array $model)
-  ->where(array $filters)
-  ->order(array $order_by)
-  ->limit(int|array $limit)
+  ->with(?array $model)
+  ->where(?array ...$conditions)
+  ->order(?array $order_by)
+  ->limit(int|array|null $limit)
   ->select(array $columns): array|bool;
 ```
 which would be equivalent to the following in MySQL:
@@ -142,7 +142,7 @@ true
 Modify existing rows with `MySQL->update()`
 
 ```php
-MySQL->get(
+MySQL->update(
   // Key, value array of column names and values to update
   array $fields,
 ): mysqli_result|bool;
@@ -164,6 +164,12 @@ In most cases you probably want to UPDATE against a constaint. Chain a [`where()
 
 Filter a `select()` or `update()` method by chaining the `MySQL->where()` method anywhere before it.
 
+```php
+MySQL->where(
+  ?array ...$conditions
+): self;
+```
+
 ### Example
 ```php
 $coffee = MySQL->for("beverages")->where(["beverage_type" => "coffee"])->select(["beverage_name", "beverage_size"]); // SELECT beverage_name, beverage_size FROM beverages WHERE (beverage_type = "coffee");
@@ -225,6 +231,12 @@ WHERE (beverage_type = 'coffee' AND beverage_size = 15) OR (beverage_type = 'tea
 
 Chain the `order()` method before a `select()` statement to order by a specific column
 
+```php
+MySQL->order(
+  ?array $order_by
+): self;
+```
+
 ```php
 $coffee = MySQL->for("beverages")->order(["beverage_name" => "ASC"])->select(["beverage_name", "beverage_size"]); // SELECT beverage_name, beverage_size FROM beverages ORDER BY beverage_name ASC
 ```
@@ -246,6 +258,12 @@ $coffee = MySQL->for("beverages")->order(["beverage_name" => "ASC"])->select(["b
 
 Chain the `limit()` method before a `select()` statement to limit the amount of columns returned
 
+```php
+MySQL->limit(
+  int|array|null $limit
+): self;
+```
+
 > **Note**
 > You can also flatten to a single dimensional array from the first entity by chaining [`MySQL->flatten()`](#flatten-array-to-single-dimension)
 

src/MySQL.php

@@ -94,7 +94,15 @@
 		}
 
 		// Create a WHERE statement from filters
-		public function where(array ...$conditions): self {
+		public function where(?array ...$conditions): self {
+			// Unset filters if null was passed
+			if ($conditions === null) {
+				$this->filter_sql = null;
+				$this->filter_values = null;
+
+				return $this;
+			}
+
 			$values = [];
 			$filters = [];
 
@@ -143,7 +151,13 @@
 		}
 
 		// Return SQL LIMIT string from integer or array of [offset => limit]
-		public function limit(int|array $limit): self {
+		public function limit(int|array|null $limit): self {
+			// Unset row limit if null was passed
+			if ($limit === null) {
+				$this->limit = null;
+				return $this;
+			}
+
 			// Set LIMIT without range directly as integer
 			if (is_int($limit)) {
 				$this->limit = $limit;
@@ -167,7 +181,13 @@
 		}
 
 		// Return SQL SORT BY string from assoc array of columns and direction
-		public function order(array $order_by): self {
+		public function order(?array $order_by): self {
+			// Unset row order by if null was passed
+			if ($order_by === null) {
+				$this->order_by = null;
+				return $this;
+			}
+
 			// Create CSV from columns
 			$sql = implode(",", array_keys($order_by));
 			// Create pipe DSV from values