Implement UpdateQuery

closes #4

src/Query/DeleteQuery.php

@@ -3,7 +3,7 @@
 
 class DeleteQuery extends SqlQuery {
 	public function __toString():string {
-		$query = $this->processClauseList([
+		return $this->processClauseList([
 			self::PRE_QUERY_COMMENT => $this->preQuery(),
 			"delete from" => $this->from(),
 			"partition" => $this->partition(),
@@ -12,8 +12,6 @@ public function __toString():string {
 			"limit" => $this->limit(),
 			self::POST_QUERY_COMMENT => $this->postQuery(),
 		]);
-
-		return $query;
 	}
 
 	public function from():array {

src/Query/UpdateQuery.php

@@ -0,0 +1,50 @@
+<?php
+namespace Gt\SqlBuilder\Query;
+
+class UpdateQuery extends SqlQuery {
+	public function __toString():string {
+		return $this->processClauseList([
+			self::PRE_QUERY_COMMENT => $this->preQuery(),
+			"update" => $this->update(),
+			"set" => $this->normaliseSet($this->set()),
+			"where" => $this->where(),
+			"order by" => $this->orderBy(),
+			"limit" => $this->limit(),
+			self::POST_QUERY_COMMENT => $this->postQuery(),
+		]);
+	}
+
+	public function update():array {
+		return [];
+	}
+
+	public function set():array {
+		return [];
+	}
+
+	public function where():array {
+		return [];
+	}
+
+	public function orderBy():array {
+		return [];
+	}
+
+	public function limit():array {
+		return [];
+	}
+
+	protected function normaliseSet(array $setData):array {
+		$normalised = [];
+		foreach($setData as $i => $name) {
+			if(is_int($i)) {
+				$normalised[$name] = ":$name";
+			}
+			else {
+				$normalised[$i] = $name;
+			}
+		}
+
+		return $normalised;
+	}
+}

test/phpunit/Helper/Query/UpdateExample.php

@@ -0,0 +1,18 @@
+<?php
+namespace Gt\SqlBuilder\Test\Helper\Query;
+
+use Gt\SqlBuilder\Query\UpdateQuery;
+
+class UpdateExample extends UpdateQuery {
+	public function update():array {
+		return [
+			"student",
+		];
+	}
+
+	public function set():array {
+		return [
+			"processedAt",
+		];
+	}
+}

test/phpunit/Helper/Query/UpdateExtendsExample.php

@@ -0,0 +1,11 @@
+<?php
+namespace Gt\SqlBuilder\Test\Helper\Query;
+
+class UpdateExtendsExample extends UpdateExample {
+	public function where():array {
+		return [
+			...parent::where(),
+			"createdAt > date_sub(now(), interval 30 day)"
+		];
+	}
+}

test/phpunit/Query/UpdateQueryTest.php

@@ -0,0 +1,20 @@
+<?php
+namespace Gt\SqlBuilder\Test\Query;
+
+use Gt\SqlBuilder\Test\Helper\Query\UpdateExample;
+use Gt\SqlBuilder\Test\Helper\Query\UpdateExtendsExample;
+use Gt\SqlBuilder\Test\QueryTestCase;
+
+class UpdateQueryTest extends QueryTestCase {
+	public function testUpdateSimple() {
+		$sut = new UpdateExample();
+		$sql = self::normalise($sut);
+		self::assertEquals("update student set processedAt = :processedAt", $sql);
+	}
+
+	public function testUpdateExtends() {
+		$sut = new UpdateExtendsExample();
+		$sql = self::normalise($sut);
+		self::assertEquals("update student set processedAt = :processedAt where createdAt > date_sub(now(), interval 30 day)", $sql);
+	}
+}