Initial SQLite development (#1)

Reviewed-on: #1

src/Query/Count.php

@@ -0,0 +1,35 @@
+<?php declare(strict_types=1);
+
+namespace BitBadger\PDODocument\Query;
+
+use BitBadger\PDODocument\{Field, Query};
+
+/**
+ * Queries for counting documents
+ */
+class Count
+{
+    /**
+     * Query to count all documents in a table
+     *
+     * @param string $tableName The name of the table in which documents should be counted
+     * @return string The query to count all documents in a table
+     */
+    public static function all(string $tableName): string
+    {
+        return "SELECT COUNT(*) FROM $tableName";
+    }
+
+    /**
+     * Query to count matching documents using a text comparison on JSON fields
+     *
+     * @param string $tableName The name of the table in which documents should be counted
+     * @param Field[] $fields The field comparison to match
+     * @param string $conjunction How to handle multiple conditions (optional; defaults to `AND`)
+     * @return string The query to count documents using a field comparison
+     */
+    public static function byFields(string $tableName, array $fields, string $conjunction = 'AND'): string
+    {
+        return self::all($tableName) . ' WHERE ' . Query::whereByFields($fields, $conjunction);
+    }
+}