Add classes and tests from common project

src/Query/Delete.php

@@ -0,0 +1,36 @@
+<?php declare(strict_types=1);
+
+namespace BitBadger\PDODocument\Query;
+
+use BitBadger\PDODocument\Field;
+use BitBadger\PDODocument\Query;
+
+/**
+ * Queries to delete documents
+ */
+class Delete
+{
+    /**
+     * Query to delete a document by its ID
+     *
+     * @param string $tableName The name of the table from which a document should be deleted
+     * @return string The DELETE statement to delete a document by its ID
+     */
+    public static function byId(string $tableName): string
+    {
+        return "DELETE FROM $tableName WHERE " . Query::whereById();
+    }
+
+    /**
+     * Query to delete documents using a comparison on JSON fields
+     *
+     * @param string $tableName The name of the table from which documents should be deleted
+     * @param Field[] $fields The field comparison to match
+     * @param string $conjunction How to handle multiple conditions (optional; defaults to `AND`)
+     * @return string The DELETE statement to delete documents via field comparison
+     */
+    public static function byFields(string $tableName, array $fields, string $conjunction = 'AND'): string
+    {
+        return "DELETE FROM $tableName WHERE " . Query::whereByFields($fields, $conjunction);
+    }
+}