From 8a8b86e31a3be7a981e26015a38af24192ca8318 Mon Sep 17 00:00:00 2001
From: "Brian J. Cardiff" <bcardiff@manas.com.ar>
Date: Fri, 29 Jan 2016 17:13:05 -0300
Subject: [PATCH] arguments support

---
 spec/std/db/dummy_driver.cr | 10 +++++++++-
 src/db/statement.cr         | 26 +++++++++++++++++++++++++-
 2 files changed, 34 insertions(+), 2 deletions(-)

diff --git a/spec/std/db/dummy_driver.cr b/spec/std/db/dummy_driver.cr
index 2aac908..13cbbe6 100644
--- a/spec/std/db/dummy_driver.cr
+++ b/spec/std/db/dummy_driver.cr
@@ -8,7 +8,15 @@ class DummyDriver < DB::Driver
       super(driver)
     end
 
-    def exec(*args)
+    protected def add_parameter(index : Int32, value)
+      raise "not implemented"
+    end
+
+    protected def add_parameter(name : String, value)
+      raise "not implemented"
+    end
+
+    protected def execute
       DummyResultSet.new self, @items.each
     end
   end
diff --git a/src/db/statement.cr b/src/db/statement.cr
index 3bf6ff5..c9c4e40 100644
--- a/src/db/statement.cr
+++ b/src/db/statement.cr
@@ -5,6 +5,30 @@ module DB
     def initialize(@driver)
     end
 
-    abstract def exec(*args) : ResultSet
+    def exec(*args) : ResultSet
+      exec args
+    end
+
+    def exec(args : Enumerable)
+      before_execute
+      args.each_with_index(1) do |arg, index|
+        if arg.is_a?(Hash)
+          arg.each do |key, value|
+            add_parameter key.to_s, value
+          end
+        else
+          add_parameter index, arg
+        end
+      end
+      execute
+    end
+
+    protected def before_execute
+    end
+
+    # 1-based positional arguments
+    protected abstract def add_parameter(index : Int32, value)
+    protected abstract def add_parameter(name : String, value)
+    protected abstract def execute : ResultSet
   end
 end