fix: use isset() when checking table property value (#52)

We can't access the `$this->table` property before initialization, so let's use `isset()` to check if the property has a value.

Reviewed-on: https://codeberg.org/vlw/php-mysql/pulls/52

README.md

@@ -1,33 +1,36 @@
-# php-libmysqldriver
+# php-mysql
 
-This library provides abstraction methods for common operations on MySQL-like databases like `SELECT`, `UPDATE`, and `INSERT` using method chaining for the various MySQL features.
+This is a simple abstraction library for MySQL DML operations.
 
 For example:
 ```php
-$db->for(string $table)
+MySQL->from(string $table)
-->with(array $model)
+  ->where(?array ...$conditions)
-->where(array $filters)
+  ->order(?array $order_by)
-->order(array $order_by)
+  ->limit(?int $limit = null, ?int $offset = null)
-->limit(1)
+  ->select(string|array|null $columns = null): mysqli_result|bool;
-->select(array $columns): array|bool;
 ```
 which would be equivalent to the following in MySQL:
 ```sql
-SELECT $columns FROM $table WHERE $filter ORDER BY $order_by LIMIT $limit;
+SELECT `columns` FROM `table` WHERE `filter` ORDER BY `order_by` LIMIT `limit`;
 ```
 
-This library is built on top of the PHP [`MySQL Improved`](https://www.php.net/manual/en/book.mysqli.php) extension.
+- All methods can be chained in any order (even multiple times) after a [`from()`](#from) as long as a [`select()`](#select), [`insert()`](#insert), [`update()`](#update), or [`delete()`](#delete) is the last method.
+- Chaining the same method more than once will override its previous value. Passing `null` to any method that accepts it will unset its value completely.
 
 ## Install from composer
 
 ```
-composer require victorwesterlund/libmysqldriver
+composer require vlw/mysql
 ```
 
 ```php
-use libmysqldriver/MySQL;
+use vlw\MySQL\MySQL;
 ```
 
+> [!IMPORTANT]
+> This library requires the [`MySQL Improved`](https://www.php.net/manual/en/book.mysqli.php) extension and PHP 8.0 or newer.
+
 # Example / Documentation
 
 Available statements
@@ -36,11 +39,12 @@ Statement|Method
 `SELECT`|[`select()`](#select)
 `UPDATE`|[`update()`](#update)
 `INSERT`|[`insert()`](#insert)
+`DELETE`|[`delete()`](#delete)
 `WHERE`|[`where()`](#where)
 `ORDER BY`|[`order()`](#order-by)
 `LIMIT`|[`limit()`](#limit)
 
----
+----
 
 `Example table name: beverages`
 id|beverage_type|beverage_name|beverage_size
@@ -51,30 +55,46 @@ id|beverage_type|beverage_name|beverage_size
 3|tea|black|15
 
 ```php
-use libmysqldriver\MySQL;
+use vlw\MySQL\MySQL;
 
 // Pass through: https://www.php.net/manual/en/mysqli.construct.php
 $db = new MySQL($host, $user, $pass, $db);
 ```
 
-# SELECT
+All executor methods [`select()`](#select), [`update()`](#update), and [`insert()`](#insert) will return a [`mysqli_result`](https://www.php.net/manual/en/class.mysqli-result.php) object or boolean.
 
-Use `MySQL->select()` to retrieve columns from a database table
+# FROM
 
 ```php
-$db->select(
+MySQL->from(
-  // Sequential array of string with column names to retrieve
+  string $table
-  // Or null to retrieve a bool if rows were matched
+): self;
-  ?array $columns
+```
-): array|bool;
+
-// Returns array of arrays for each row, or bool if no columns were defined
+All queries start by chaining the `from(string $table)` method. This will define which database table the current query should be executed on.
+
+*Example:*
+```php
+MySQL->from("beverages")->select("beverage_type");
+```
+
+# SELECT
+
+Chain `MySQL->select()` anywhere after a [`MySQL->from()`](#from) to retrieve columns from a database table.
+
+Pass an associative array of strings, CSV string, or null to this method to filter columns.
+
+```php
+MySQL->select(
+  string|array|null $columns
+): mysqli_result|bool;
 ```
 
 In most cases you probably want to select with a constraint. Chain the [`where()`](#where) method before `select()` to filter the query
 
 ### Example
 ```php
-$beverages = $db->for("beverages")->select(["beverage_name", "beverage_size"]); // SELECT beverage_name, beverage_size FROM beverages
+$`beverages` = MySQL->from("beverages")->select(["beverage_name", "beverage_size"]); // SELECT `beverage_name`, `beverage_size` FROM beverages
 ```
 ```
 [
@@ -92,10 +112,12 @@ $beverages = $db->for("beverages")->select(["beverage_name", "beverage_size"]);
 
 # INSERT
 
-Use `MySQL->insert()` to append a new row to a database table
+Chain `MySQL->insert()` anywhere after a [`MySQL->from()`](#from) to append a new row to a database table.
+
+Passing a sequential array to `insert()` will assume that you wish to insert data for all defined columns in the table. Pass an associative array of `[column_name => value]` to INSERT data for specific columns (assuming the other columns have a [DEFAULT](https://dev.mysql.com/doc/refman/8.0/en/data-type-defaults.html) value defined).
 
 ```php
-$db->insert(
+MySQL->insert(
   // Array of values to INSERT
   array $values
 ): bool
@@ -105,13 +127,38 @@ $db->insert(
 #### Example
 
 ```php
-$db->for("beverages")->insert([
+MySQL->from("beverages")->insert([
   null,
   "coffee",
   "latte",
   10
 ]);
-// INSERT INTO beverages VALUES (null, "coffee", "latte", 10);
+// INSERT INTO `beverages` VALUES (null, "coffee", "latte", 10);
+```
+```
+true
+```
+
+# DELETE
+
+Chain `MySQL->delete()` anywhere after a [`MySQL->from()`](#from) to remove a row or rows from the a database table.
+
+```php
+MySQL->delete(
+  array ...$conditions
+): bool
+// Returns true if at least one row was deleted
+```
+
+This method takes at least one [`MySQL->where()`](#where)-syntaxed argument to determine which row or rows to delete. Refer to the [`MySQL->where()`](#where) section for more information.
+
+#### Example
+
+```php
+MySQL->from("beverages")->delete([
+  "beverage_name" => "coffee",
+]);
+// DELETE FROM `beverages` WHERE `beverage_name` = "coffee";
 ```
 ```
 true
@@ -119,34 +166,42 @@ true
 
 # UPDATE
 
-Modify existing rows with `MySQL->update()`
+Chain `MySQL->update()` anywhere after a [`MySQL->from()`](#from) to modify existing rows in a database table.
 
 ```php
-$db->get(
+MySQL->update(
   // Key, value array of column names and values to update
   array $fields,
-): bool;
+): mysqli_result|bool;
 // Returns true if at least 1 row was changed
 ```
 
 ### Example
 ```php
-$db->for("beverages")->update(["beverage_size" => 10]); // UPDATE beverages SET beverage_size = 10
+MySQL->from("beverages")->update(["beverage_size" => 10]); // UPDATE `beverages` SET `beverage_size` = 10
 ```
 ```php
 true
 ```
 
-In most cases you probably want to UPDATE against a constaint. Chain a [`where()`](#where) method before `update()` to set constraints
+In most cases you probably want to UPDATE against a constaint. Chain a [`where()`](#where) method before [`MySQL->update()`](#update) to set constraints
 
 
 # WHERE
 
-Filter a `select()` or `update()` method by chaining the `MySQL->where()` method anywhere before it.
+Filter a [`MySQL->select()`](#select) or [`MySQL->update()`](#update) method by chaining the `MySQL->where()` method anywhere before it. The [`MySQL->delete()`](#delete) executor method also uses the same syntax for its arguments.
+
+Each key, value pair will be `AND` constrained against each other.
+
+```php
+MySQL->where(
+  ?array ...$conditions
+): self;
+```
 
 ### Example
 ```php
-$coffee = $db->for("beverages")->where(["beverage_type" => "coffee"])->select(["beverage_name", "beverage_size"]); // SELECT beverage_name, beverage_size FROM beverages WHERE (beverage_type = "coffee");
+$coffee = MySQL->from("beverages")->where(["beverage_type" => "coffee"])->select(["beverage_name", "beverage_size"]); // SELECT `beverage_name`, `beverage_size` FROM `beverages` WHERE (`beverage_type` = "coffee");
 ```
 ```php
 [
@@ -161,9 +216,7 @@ $coffee = $db->for("beverages")->where(["beverage_type" => "coffee"])->select(["
 ]
 ```
 
-## Advanced filtering
+## Capture groups
-
-You can do more detailed filtering by passing more constraints into the same array, or even futher by passing multiple arrays each with filters.
 
 ### AND
 
@@ -176,7 +229,7 @@ MySQL->where([
 ]);
 ```
 ```sql
-WHERE (beverage_type = 'coffee' AND beverage_size = 15)
+WHERE (`beverage_type` = 'coffee' AND `beverage_size` = 15)
 ```
 
 ### OR
@@ -197,16 +250,41 @@ $filter2 = [
 MySQL->where($filter1, $filter2, ...);
 ```
 ```sql
-WHERE (beverage_type = 'coffee' AND beverage_size = 15) OR (beverage_type = 'tea' AND beverage_name = 'black')
+WHERE (`beverage_type` = 'coffee' AND `beverage_size` = 15) OR (`beverage_type` = 'tea' AND `beverage_name` = 'black')
 ```
 
+## Define custom operators
+
+By default, all values in an the assoc array passed to `where()` will be treated as an `EQUALS` (=) operator.
+
+```php
+MySQL->where(["column" => "euqals_this_value"]);
+```
+
+Setting the value of any key to another assoc array will allow for more "advanced" filtering by defining your own [`Operators`](https://github.com/VictorWesterlund/php-libmysqldriver/blob/master/src/Operators.php).
+
+The key of this subarray can be any MySQL operator string, or the **->value** of any case in the [`Operators`](https://github.com/VictorWesterlund/php-libmysqldriver/blob/master/src/Operators.php) enum.
+
+```php
+MySQL->where([
+  "beverage_name" => [
+    Operators::LIKE->value => "%wildcard_contains%"
+  ]
+]);
+```
 
 # ORDER BY
 
-Chain the `order()` method before a `select()` statement to order by a specific column
+Chain the `MySQL->order()` method before a [`MySQL->select()`](#select) statement to order by a specific column
 
 ```php
-$coffee = $db->for("beverages")->order(["beverage_name" => "ASC"])->select(["beverage_name", "beverage_size"]); // SELECT beverage_name, beverage_size FROM beverages ORDER BY beverage_name ASC
+MySQL->order(
+  ?array $order_by
+): self;
+```
+
+```php
+$coffee = MySQL->from("beverages")->order(["beverage_name" => "ASC"])->select(["beverage_name", "beverage_size"]); // SELECT `beverage_name`, `beverage_size` FROM `beverages` ORDER BY `beverage_name` ASC
 ```
 ```php
 [
@@ -218,35 +296,41 @@ $coffee = $db->for("beverages")->order(["beverage_name" => "ASC"])->select(["bev
     "beverage_name" => "tea",
     "beverage_size" => 15
   ],
-  // ...etc for "beverage_name = coffee"
+  // ...etc for "`beverage_name` = coffee"
 ]
 ```
 
 # LIMIT
 
-Chain the `limit()` method before a `select()` statement to limit the amount of columns returned
+Chain the `limit()` method before a [`MySQL->select()`](#select) statement to limit the amount of columns returned
 
-> **Note**
+```php
-> Passing (int) `1` will flatten the returned array from a `select()` statement to two dimensions (k => v)
+MySQL->limit(
+  ?int $limit,
+  ?int $offset = null
+): self;
+```
 
-## Passing an integer to LIMIT
+## Passing a single integer argument
 This will simply `LIMIT` the results returned to the integer passed
 
 ```php
-$coffee = $db->for("beverages")->limit(1)->select(["beverage_name", "beverage_size"]); // SELECT beverage_name, beverage_size FROM beverages WHERE beverage_type = "coffee" LIMIT 1
+$coffee = MySQL->from("beverages")->limit(1)->select(["beverage_name", "beverage_size"]); // SELECT `beverage_name`, `beverage_size` FROM `beverages` WHERE `beverage_type` = "coffee" LIMIT 1
 ```
 ```php
 [
-  "beverage_name" => "cappuccino",
+  [
-  "beverage_size" => 10
+    "beverage_name" => "cappuccino",
+    "beverage_size" => 10
+  ]
 ]
 ```
 
-## Passing an associative array to LIMIT
+## Passing two integer arguments
-This will `OFFSET` and `LIMIT` the results returned from the first key of the array as `OFFSET` and the value of that key as `LIMIT`
+This will `OFFSET` and `LIMIT` the results returned. The first argument will be the `LIMIT` and the second argument will be its `OFFSET`.
 
 ```php
-$coffee = $db->for("beverages")->limit([3 => 2])->select(["beverage_name", "beverage_size"]); // SELECT beverage_name, beverage_size FROM beverages LIMIT 3 OFFSET 2
+$coffee = MySQL->from("beverages")->limit(3, 2)->select(["beverage_name", "beverage_size"]); // SELECT `beverage_name`, `beverage_size` FROM `beverages` LIMIT 3 OFFSET 2
 ```
 ```php
 [

composer.json

@@ -1,18 +1,18 @@
 {
-    "name": "victorwesterlund/libmysqldriver",
+    "name": "vlw/mysql",
-    "description": "Abstraction library for common mysqli features",
+    "description": "Abstraction library for common MySQL/MariaDB DML operations with php-mysqli",
     "type": "library",
-    "license": "GPL-3.0-only",
+    "license": "GPL-3.0-or-later",
     "authors": [
         {
             "name": "Victor Westerlund",
-            "email": "victor.vesterlund@gmail.com"
+            "email": "victor@vlw.se"
         }
     ],
     "minimum-stability": "dev",
     "autoload": {
         "psr-4": {
-            "libmysqldriver\\": "src/"
+            "vlw\\MySQL\\": "src/"
         }
     },
     "require": {}

src/DatabaseDriver.php

@@ -1,98 +0,0 @@
-<?php
-
-	namespace libmysqldriver\Driver;
-
-	use \mysqli;
-	use \mysqli_stmt;
-	use \mysqli_result;
-
-	// MySQL query builder and executer abstractions
-	class DatabaseDriver extends mysqli {
-		// Passing arguments to https://www.php.net/manual/en/mysqli.construct.php
-		function __construct() {
-			parent::__construct(...func_get_args());
-		}
-
-		// Bind SQL statements
-		private function bind_params(mysqli_stmt &$stmt, mixed $params): bool {
-			// Convert single value parameter to array
-			$params = is_array($params) ? $params : [$params];
-			if (empty($params)) {
-				return true;
-			}
-
-			// Concatenated string with types for each parameter
-			$types = "";
-
-			// Convert PHP primitves to SQL primitives
-			foreach ($params as $param) {
-				switch (gettype($param)) {
-					case "integer":
-					case "double":
-					case "boolean":
-						$types .= "i";
-						break;
-
-					case "string":
-					case "array":
-					case "object":
-						$types .= "s";
-						break;
-
-					default:
-						$types .= "b";
-						break;
-				}
-			}
-
-			return $stmt->bind_param($types, ...$params);
-		}
-
-		// Execute an SQL query with a prepared statement
-		private function run_query(string $sql, mixed $params = null): mysqli_result|bool {
-			$stmt = $this->prepare($sql);
-
-			// Bind parameters if provided
-			if ($params !== null) {
-				$this->bind_params($stmt, $params);
-			}
-
-			// Execute statement and get retrieve changes
-			$query = $stmt->execute();
-			$res = $stmt->get_result();
-
-			// Return true if an INSERT, UPDATE or DELETE was sucessful (no rows returned)
-			if (!empty($query) && empty($res)) {
-				return true;
-			}
-
-			// Return mysqli_result object
-			return $res;
-		}
-
-		/* ---- */
-
-		// Execute SQL query with optional prepared statement and return array of affected rows
-		public function exec(string $sql, mixed $params = null): array {
-			$query = $this->run_query($sql, $params);
-			$res = [];
-
-			// Fetch rows into sequential array
-			while ($row = $query->fetch_assoc()) {
-				$res[] = $row;
-			}
-
-			return $res;
-		}
-
-		// Execute SQL query with optional prepared statement and return true if query was successful
-		public function exec_bool(string $sql, mixed $params = null): bool {
-			$query = $this->run_query($sql, $params);
-
-			return gettype($query) === "boolean"
-				// Type is already a bool, so return it as is
-				? $query
-				// Return true if rows were matched
-				: $query->num_rows > 0;
-		}
-	}

src/MySQL.php

@@ -1,71 +1,100 @@
 <?php
 
-	namespace libmysqldriver;
+	namespace vlw\MySQL;
 
-	use \Exception;
+	use Exception;
-	use \victorwesterlund\xEnum;
 	
-	use libmysqldriver\Driver\DatabaseDriver;
+	use mysqli;
+	use mysqli_stmt;
+	use mysqli_result;
 
-	require_once "DatabaseDriver.php";
+	use vlw\MySQL\Order;
+	use vlw\MySQL\Operators;
+
+	require_once "Order.php";
+	require_once "Operators.php";
 
 	// Interface for MySQL_Driver with abstractions for data manipulation
-	class MySQL extends DatabaseDriver {
+	class MySQL extends mysqli {
-		private string $table;
+		public ?array $columns = null;
-		private array $model;
 		
-		private ?string $order_by = null;
+		protected string $table;
-		private ?string $filter_sql = null;
+		protected ?string $limit = null;
-		private array $filter_values = [];
+		protected ?string $order_by = null;
-		private int|string|null $limit = null;
+		protected array $filter_columns = [];
+		protected array $filter_values = [];
+		protected ?string $filter_sql = null;
 
 		// Pass constructor arguments to driver
-		function __construct(string $table) {
+		function __construct() {
 			parent::__construct(...func_get_args());
 		}
 
+		/*
+			# Helper methods
+		*/
+
 		private function throw_if_no_table() {
-			if (!$this->table) {
+			if (!isset($this->table)) {
 				throw new Exception("No table name defined");
 			}
 		}
 
-		// Return value(s) that exist in $this->model
+		// Coerce input to single dimensional array
-		private function in_model(string|array $columns): ?array {
+		private static function to_list_array(mixed $input): array {
-			// Place string into array
+			return array_values(is_array($input) ? $input : [$input]);
-			$columns = is_array($columns) ? $columns : [$columns];
-			// Return columns that exist in table model
-			return array_filter($columns, fn($col): string => in_array($col, $this->model));
 		}
 
-		/* ---- */
+		// Convert value to MySQL tinyint
+		private static function filter_boolean(mixed $value): int {
+			return (int) filter_var($value, FILTER_VALIDATE_BOOLEAN);
+		}
+
+		// Convert all boolean type values to tinyints in array
+		private static function filter_booleans(array $values): array {
+			return array_map(fn(mixed $v): mixed => gettype($v) === "boolean" ? self::filter_boolean($v) : $v, $values);
+		}
+
+		private static function array_wrap_accents(array $input): array {
+			return array_map(fn(mixed $v): string => "`{$v}`", $input);
+		}
+
+		/*
+			# Definers
+			These methods are used to build an SQL query by chaining methods together.
+			Defined parameters will then be executed by an Executer method.
+		*/
 
 		// Use the following table name
-		public function for(string $table): self {
+		public function from(string $table): self {
+			// Reset all definers when a new query begins
+			$this->where();
+			$this->limit();
+			$this->order();
+
 			$this->table = $table;
 			return $this;
 		}
 
-		// Restrict query to array of column names
+		#[\Deprecated(
-		public function with(array $model): self {
+			message: "use MySQL->from() instead",
-			// Reset table model
+			since: "3.5.7",
-			$this->model = [];
+		)]
-
+		public function for(string $table): self {
-			foreach ($model as $k => $v) {
+			return $this->from($table);
-				// Column values must be strings
-				if (!is_string($v)) {
-					throw new Exception("Key {$k} must have a value of type string");
-				}
-
-				// Append column to model
-				$this->model[] = $v;
-			}
-
-			return $this;
 		}
 
 		// Create a WHERE statement from filters
 		public function where(?array ...$conditions): self {
+			// Unset filters if null was passed
+			if ($conditions === null) {
+				$this->filter_sql = null;
+				$this->filter_columns = null;
+				$this->filter_values = null;
+
+				return $this;
+			}
+
 			$values = [];
 			$filters = [];
 
@@ -73,22 +102,51 @@
 			foreach ($conditions as $condition) {
 				$filter = [];
 
+				// Move along if the condition is empty
+				if (empty($condition)) {
+					continue;
+				}
+
 				// Create SQL string and append values to array for prepared statement
-				foreach ($condition as $col => $value) {
+				foreach ($condition as $col => $operation) {
-					if ($this->model && !$this->in_model($col)) {
+					$this->filter_columns[] = $col;
-						continue;
+
+					// Assume we want an equals comparison if value is not an array
+					if (!is_array($operation)) {
+						$operation = [Operators::EQUALS->value => $operation];
 					}
 
-					// Create SQL for prepared statement
+					// Resolve all operator enum values in inner array
-					$filter[] = "`{$col}` = ?";
+					foreach ($operation as $operator => $value) {
-					// Append value to array with all other values
+						// Null values have special syntax
-					$values[] = $value;
+						if (is_null($value)) {
+							// Treat anything that isn't an equals operator as falsy
+							if ($operator !== Operators::EQUALS->value) {
+								$filter[] = "`{$col}` IS NOT NULL";
+								continue;
+							}
+
+							$filter[] = "`{$col}` IS NULL";	
+							continue;
+						}
+
+						// Create SQL for prepared statement
+						$filter[] = "`{$col}` {$operator} ?";
+						
+						// Append value to array with all other values
+						$values[] = $value;
+					}
 				}
 
 				// AND together all conditions into a group
 				$filters[] = "(" . implode(" AND ", $filter) . ")";
 			}
 
+			// Do nothing if no filters were set
+			if (empty($filters)) {
+				return $this;
+			}
+
 			// OR all filter groups
 			$this->filter_sql = implode(" OR ", $filters);
 			// Set values property
@@ -97,48 +155,53 @@
 			return $this;
 		}
 
-		// Return SQL LIMIT string from integer or array of [offset => limit]
+		// SQL LIMIT string
-		public function limit(int|array $limit): self {
+		public function limit(?int $limit = null, ?int $offset = null): self {
-			// Set LIMIT without range directly as integer
+			// Unset row limit if null was passed
-			if (is_int($limit)) {
+			if ($limit === null) {
-				$this->limit = $limit;
+				$this->limit = null;
 				return $this;
 			}
 
-			// Use array key as LIMIT range start value
+			// Coerce offset to zero if no offset is defined
-			$offset = (int) array_keys($limit)[0];
+			$offset = $offset ?? 0;
-			// Use array value as LIMIT range end value
-			$limit = (int) array_values($limit)[0];
 
-			// Set limit as SQL CSV
+			// Set limit and offset as SQL CSV
 			$this->limit = "{$offset},{$limit}";
 			return $this;
 		}
 
 		// 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 = null): self {
-			// Create CSV from columns
+			// Unset row order by if null was passed
-			$sql = implode(",", array_keys($order_by));
+			if ($order_by === null) {
-			// Create pipe DSV from values 
+				$this->order_by = null;
-			$sql .= " " . implode("|", array_values($order_by));
+				return $this;
+			}
 
-			$this->order_by = $sql;
+			// Assign Order Enum entries from array of arrays<Order|string>
+			$orders = array_map(fn(Order|string $order): Order => $order instanceof Order ? $order : Order::tryFrom($order), array_values($order_by));
+			// Create CSV string with Prepared Statement abbreviations from length of fields array.
+			$sql = array_map(fn(string $column, Order|string $order): string => "`{$column}` " . $order->value, array_keys($order_by), $orders);
+
+			$this->order_by = implode(",", $sql);
 			return $this;
 		}
 
-		/* ---- */
+		/*
+			# Executors
+			These methods execute various statements that each return a mysqli_result
+		*/
 
 		// Create Prepared Statament for SELECT with optional WHERE filters
-		public function select(?array $columns = null): array|bool {
+		public function select(array|string|null $columns = null): mysqli_result|bool {
 			$this->throw_if_no_table();
 
-			// Filter columns that aren't in the model if defiend
+			// Create array of columns from CSV
-			if ($columns && $this->model) {
+			$this->columns = is_array($columns) || is_null($columns) ? $columns : explode(",", $columns);
-				$columns = $this->in_model($columns);
-			}
 
 			// Create CSV from columns or default to SQL NULL as a string
-			$columns_sql = $columns ? implode(",", $columns) : "NULL";
+			$columns_sql = $this->columns ? implode(",", self::array_wrap_accents($this->columns)) : "NULL";
 
 			// Create LIMIT statement if argument is defined
 			$limit_sql = !is_null($this->limit) ? " LIMIT {$this->limit}" : "";
@@ -150,67 +213,74 @@
 			$filter_sql = !is_null($this->filter_sql) ? " WHERE {$this->filter_sql}" : "";
 
 			// Interpolate components into an SQL SELECT statmenet and execute
-			$sql = "SELECT {$columns_sql} FROM {$this->table}{$filter_sql}{$order_by_sql}{$limit_sql}";
+			$sql = "SELECT {$columns_sql} FROM `{$this->table}`{$filter_sql}{$order_by_sql}{$limit_sql}";
-
+			// Return mysqli_response of matched rows
-			$test = $this->model;
+			return $this->execute_query($sql, self::to_list_array($this->filter_values));
-
-			// No columns were specified, return true if query matched rows
-			if (!$columns) {
-				return $this->exec_bool($sql, $this->filter_values);
-			}
-
-			// Return array of matched rows
-			$exec = $this->exec($sql, $this->filter_values);
-			// Flatten array if LIMIT is 1
-			return empty($exec) || $this->limit !== 1 ? $exec : $exec[0];
 		}
 
 		// Create Prepared Statement for UPDATE using PRIMARY KEY as anchor
-		public function update(array $entity): bool {
+		public function update(array $entity): mysqli_result|bool {
 			$this->throw_if_no_table();
 
-			// Make constraint for table model if defined
-			if ($this->model) {
-				foreach (array_keys($entity) as $col) {
-					// Throw if column in entity does not exist in defiend table model
-					if (!in_array($col, $this->model)) {
-						throw new Exception("Column key '{$col}' does not exist in table model");
-					}
-				}
-			}
-
 			// Create CSV string with Prepared Statement abbreviations from length of fields array.
-			$changes = array_map(fn($column) => "{$column} = ?", array_keys($entity));
+			$changes = array_map(fn($column) => "`{$column}` = ?", array_keys($entity));
 			$changes = implode(",", $changes);
 
 			// Get array of SQL WHERE string and filter values
 			$filter_sql = !is_null($this->filter_sql) ? " WHERE {$this->filter_sql}" : "";
 
-			$values = array_values($entity);
+			// Get values from entity and convert booleans to tinyint
-			// Append filter values if defined
+			$values = self::filter_booleans(array_values($entity));
+			
+			// Append values to filter property if where() was chained
 			if ($this->filter_values) {
 				array_push($values, ...$this->filter_values);
 			}
 
 			// Interpolate components into an SQL UPDATE statement and execute
-			$sql = "UPDATE {$this->table} SET {$changes} {$filter_sql}";
+			$sql = "UPDATE `{$this->table}` SET {$changes} {$filter_sql}";
-			return $this->exec_bool($sql, $values);
+			return $this->execute_query($sql, self::to_list_array($values));
 		}
 
 		// Create Prepared Statemt for INSERT
-		public function insert(array $values): bool {
+		public function insert(array $values): mysqli_result|bool {
 			$this->throw_if_no_table();
 
-			// A value for each column in table model must be provided
+			/*
-			if ($this->model && count($values) !== count($this->model)) {
+				Use array keys from $values as columns to insert if array is associative.
-				throw new Exception("Values length does not match columns in model");
+				Treat statement as an all-columns INSERT if the $values array is sequential.
-			}
+			*/
+			$columns = !array_is_list($values) ? "(" . implode(",", array_keys($values)) . ")" : "";
+
+			// Convert booleans to tinyint
+			$values = self::filter_booleans($values);
 
 			// Create CSV string with Prepared Statement abbreviatons from length of fields array.
 			$values_stmt = implode(",", array_fill(0, count($values), "?"));
 
 			// Interpolate components into an SQL INSERT statement and execute
-			$sql = "INSERT INTO {$this->table} VALUES ({$values_stmt})";
+			$sql = "INSERT INTO `{$this->table}` {$columns} VALUES ({$values_stmt})";
-			return $this->exec_bool($sql, $values);
+			return $this->execute_query($sql, self::to_list_array($values));
+		}
+
+		// Create Prepared Statemente for DELETE with WHERE condition(s)
+		public function delete(array ...$conditions): mysqli_result|bool {
+			$this->throw_if_no_table();
+
+			// Set DELETE WHERE conditions from arguments
+			if ($conditions) {
+				$this->where(...$conditions);
+			}
+
+			// Get array of SQL WHERE string and filter values
+			$filter_sql = !is_null($this->filter_sql) ? " WHERE {$this->filter_sql}" : "";
+
+			$sql = "DELETE FROM `{$this->table}`{$filter_sql}";
+			return $this->execute_query($sql, self::to_list_array($this->filter_values));
+		}
+
+		// Execute SQL query with optional prepared statement and return mysqli_result
+		public function exec(string $sql, mixed $params = null): mysqli_result {
+			return $this->execute_query($sql, self::to_list_array($params));
 		}
 	}

src/Operators.php

@@ -0,0 +1,46 @@
+<?php
+
+	namespace vlw\MySQL;
+
+	enum Operators: string {
+		// Logical
+		case ALL     = "ALL";
+		case AND     = "AND";
+		case ANY     = "ANY";
+		case BETWEEN = "BETWEEN";
+		case EXISTS  = "EXISTS";
+		case IN      = "IN";
+		case LIKE    = "LIKE";
+		case NOT     = "NOT";
+		case OR      = "OR";
+		case SOME    = "SOME";
+
+		// Comparison
+		case EQUALS = "=";
+		case GT     = ">";
+		case LT     = "<";
+		case GTE    = ">=";
+		case LTE    = "<=";
+		case NOTE   = "<>";
+
+		// Arithmetic
+		case ADD      = "+";
+		case SUBTRACT = "-";
+		case MULTIPLY = "*";
+		case DIVIDE   = "/";
+		case MODULO   = "%"; 
+
+		// Bitwise
+		case BS_AND = "&";
+		case BS_OR  = "|";
+		case BS_XOR = "^";
+
+		// Compound
+		case ADDE    = "+=";
+		case SUBE    = "-=";
+		case DIVE    = "/=";
+		case MODE    = "%=";
+		case BS_ANDE = "&=";
+		case BS_ORE  = "|*=";
+		case BS_XORE = "^-=";
+	}

src/Order.php

@@ -0,0 +1,8 @@
+<?php
+
+	namespace vlw\MySQL;
+
+	enum Order: string {
+		case ASC  = "ASC";
+		case DESC = "DESC";
+	}