allow resetting query

Tests/Unit/Delete/DeleteQueryBuilderTest.php

@@ -96,4 +96,18 @@ class DeleteQueryBuilderTest extends TestCase
 				->getName()
 		);
 	}
+
+	/**
+	 * Test reset of builder
+	 *
+	 * @covers DeleteQueryBuilder::resetBuilder()
+	 * @covers DeleteQueryBuilder::$deleteQuery
+	 */
+	public function testResetOfBuilder()
+	{
+		$entryGenerator = $this->entryDeleteGeneratorFactory();
+		$newBuilder = new MySqlBuilder();
+		$entryGenerator->resetBuilder( $newBuilder );
+		$this->assertSame( $newBuilder, $entryGenerator->getBuilder( ) );
+	}
 }

Tests/Unit/Select/SelectQueryBuilderTest.php

@@ -109,4 +109,17 @@ class SelectQueryBuilderTest extends TestCase
 		$this->assertEquals(Entry::DESC, 'DESC');
 		$this->assertEquals(EntryValues::DESC, 'DESC');
 	}
+
+	/**
+	 * Test reset of builder
+	 *
+	 * @covers SelectQueryBuilder::resetBuilder()
+	 */
+	public function testResetOfBuilder()
+	{
+		$entryGenerator = $this->entryGeneratorFactory();
+		$newBuilder = new MySqlBuilder();
+		$entryGenerator->resetBuilder( $newBuilder );
+		$this->assertSame( $newBuilder, $entryGenerator->getBuilder( ) );
+	}
 }

src/CreatesSqlQueries.php

@@ -31,4 +31,12 @@ interface CreatesSqlQueries
 	 * @return MySqlBuilder
 	 */
 	public function getBuilder();
+
+	/**
+	 * Reset the query builder
+	 *
+	 * @param MySqlBuilder|null $builder New builder or null to use default empty
+	 * @return $this
+	 */
+	public function resetBuilder( MySqlBuilder $builder = null );
 }

src/QueryBuilder.php

@@ -44,6 +44,18 @@ abstract class QueryBuilder implements CreatesSqlQueries
 		$this->tableName = $tableName;
 	}
 
+	/** @inheritdoc */
+	public function resetBuilder(MySqlBuilder $builder = null)
+	{
+		if( ! $builder ){
+			$builder = new MySqlBuilder();
+		}
+
+		$this->builder = $builder;
+		return $this;
+
+	}
+
 	/**
 	 * @return AbstractBaseQuery
 	 */

src/Select/SelectQueryBuilder.php

@@ -47,4 +47,6 @@ abstract class SelectQueryBuilder extends QueryBuilder implements DoesSelectQuer
 		$this->getCurrentQuery()->orderBy($column, $order);
 		return $this;
 	}
+
+
 }