Added #changes and #reset to the sqlite3 driver

lib/sqlite3/database.rb

@@ -260,9 +260,14 @@ def last_insert_row_id
     # Returns the number of changes made to this database instance by the last
     # operation performed. Note that a "delete from table" without a where
     # clause will not affect this value.
-    # def changes
-    #   @driver.changes(@handle)
-    # end
+    def changes
+      @driver.changes(@handle)
+    end
+
+    # Resets a prepared statement object
+    def reset
+      @driver.reset(@handle)
+    end
 
     # Returns the total number of changes made to this database instance
     # since it was opened.

lib/sqlite3/driver/ffi/api.rb

@@ -35,10 +35,10 @@ module API
         attach_function :sqlite3_prepare, [:pointer, :string, :int, :pointer, :pointer], :int
         # attach_function :sqlite3_prepare16, [:pointer, :pointer, :int, :pointer, :pointer], :int
         attach_function :sqlite3_finalize, [:pointer], :int
-        # attach_function :sqlite3_reset, [:pointer], :int
+        attach_function :sqlite3_reset, [:pointer], :int
         attach_function :sqlite3_step, [:pointer], :int
         attach_function :sqlite3_last_insert_rowid, [:pointer], :int64
-        # attach_function :sqlite3_changes, [:pointer], :int
+        attach_function :sqlite3_changes, [:pointer], :int
         # attach_function :sqlite3_total_changes, [:pointer], :int
         # attach_function :sqlite3_interrupt, [:pointer], :void
         # attach_function :sqlite3_complete, [:string], :int

lib/sqlite3/driver/ffi/driver.rb

@@ -146,7 +146,7 @@ def self.api_delegate(name)
         api_delegate :bind_parameter_index
         api_delegate :bind_parameter_name
         api_delegate :busy_timeout
-        # api_delegate :changes
+        api_delegate :changes
         api_delegate :close
         # api_delegate :column_bytes
         # api_delegate :column_bytes16
@@ -161,7 +161,7 @@ def self.api_delegate(name)
         # api_delegate :interrupt
         api_delegate :last_insert_rowid
         api_delegate :libversion
-        # api_delegate :reset
+        api_delegate :reset
         # api_delegate :result_error
         api_delegate :step
         # api_delegate :total_changes

test/test_database_queries_utf_8.rb

@@ -27,6 +27,29 @@ def test_execute
     assert_nil row[5]
   end
 
+  def test_changes
+    assert_equal 0, @db.changes
+    @db.execute("INSERT INTO t1 VALUES(NULL, 'text1', 1.22, 42, 4294967296, NULL)")
+    @db.execute("INSERT INTO t1 VALUES(NULL, 'text1', 1.22, 42, 4294967296, NULL)")
+    assert_equal 1, @db.changes
+    @db.execute("update t1 set t = null")
+    assert_equal 2, @db.changes
+
+    last_id = @db.execute("select id from t1 limit 1")[0]
+    @db.execute("delete from t1 where id=?", last_id)
+    assert_equal 1, @db.changes
+
+    @db.execute("delete from t1")
+    assert_equal 0, @db.changes
+  end
+
+  # This test requires the existence of the reset method
+  def test_reset
+    query = "INSERT INTO t1 VALUES(1, 'text1', 1.22, 42, 4294967296, NULL)"
+    @db.execute(query)
+    assert_raise(SQLite3::SQLException) { @db.execute(query) }
+  end
+
   def test_execute_with_bindings
     blob = open("test/fixtures/SQLite.gif", "rb").read
     @db.execute("INSERT INTO t1 VALUES(?, ?, ?, ?, ?, ?)", nil, "text1", 1.22, 42, 4294967296, blob)