alpha2 (#2)

- Change multiple field matching to enum
- Implement auto-generated IDs

Reviewed-on: #2

src/Query/Exists.php

@@ -2,7 +2,7 @@
 
 namespace BitBadger\PDODocument\Query;
 
-use BitBadger\PDODocument\{Field, Query};
+use BitBadger\PDODocument\{DocumentException, Field, FieldMatch, Query};
 
 /**
  * Queries to determine document existence
@@ -26,6 +26,7 @@ class Exists
      *
      * @param string $tableName The name of the table in which document existence should be checked
      * @return string The query to determine document existence by ID
+     * @throws DocumentException If the database mode has not been set
      */
     public static function byId(string $tableName): string
     {
@@ -37,11 +38,12 @@ class Exists
      *
      * @param string $tableName The name of the table in which document existence should be checked
      * @param Field[] $fields The field comparison to match
-     * @param string $conjunction How to handle multiple conditions (optional; defaults to `AND`)
+     * @param FieldMatch|null $match How to handle multiple conditions (optional; defaults to All)
      * @return string The query to determine document existence by field comparison
+     * @throws DocumentException If the database mode has not been set
      */
-    public static function byFields(string $tableName, array $fields, string $conjunction = 'AND'): string
+    public static function byFields(string $tableName, array $fields, ?FieldMatch $match = null): string
     {
-        return self::query($tableName, Query::whereByFields($fields, $conjunction));
+        return self::query($tableName, Query::whereByFields($fields, $match));
     }
 }