extend sqlite with time (as text) support.

spec/driver_spec.cr

@@ -25,6 +25,7 @@ def sqlite_type_for(v)
   when String          ; "text"
   when Int32, Int64    ; "int"
   when Float32, Float64; "float"
+  when Time            ; "text"
   else
     raise "not implemented for #{typeof(v)}"
   end
@@ -200,6 +201,24 @@ describe Driver do
     end
   end
 
+  it "insert/get value date from table" do
+    with_db do |db|
+      value = Time.new(2016, 7, 22, 15, 0, 0, 0)
+      db.exec "create table table1 (col1 #{sqlite_type_for(value)})"
+      db.exec %(insert into table1 values (?)), value
+
+      db.query "select col1 from table1" do |rs|
+        rs.move_next
+        rs.read(Time).should eq(value)
+      end
+
+      db.query "select col1 from table1" do |rs|
+        rs.move_next
+        rs.read?(Time).should eq(value)
+      end
+    end
+  end
+
   it "raises on unsupported param types" do
     with_db do |db|
       expect_raises Exception, "SQLite3::Statement does not support NotSupportedType params" do

src/sqlite3.cr

@@ -1,2 +1,6 @@
 require "db"
 require "./sqlite3/**"
+
+module SQLite3
+  DATE_FORMAT = "%F %H:%M:%S.%L"
+end

src/sqlite3/result_set.cr

@@ -22,7 +22,7 @@ class SQLite3::ResultSet < DB::ResultSet
     end
   end
 
-  {% for t in DB::TYPES %}
+  macro nilable_read_for(t)
     def read?(t : {{t}}.class) : {{t}}?
       if read_nil?
         moving_column { nil }
@@ -30,6 +30,10 @@ class SQLite3::ResultSet < DB::ResultSet
         read(t)
       end
     end
+  end
+
+  {% for t in DB::TYPES %}
+    nilable_read_for({{t}})
   {% end %}
 
   def read(t : String.class) : String
@@ -62,6 +66,12 @@ class SQLite3::ResultSet < DB::ResultSet
     end
   end
 
+  def read(t : Time.class) : Time
+    Time.parse read(String), SQLite3::DATE_FORMAT
+  end
+
+  nilable_read_for Time
+
   def column_count
     LibSQLite3.column_count(self)
   end

src/sqlite3/statement.cr

@@ -56,6 +56,10 @@ class SQLite3::Statement < DB::Statement
     check LibSQLite3.bind_blob(self, index, value, value.size, nil)
   end
 
+  private def bind_arg(index, value : Time)
+    bind_arg(index, value.to_s(SQLite3::DATE_FORMAT))
+  end
+
   private def bind_arg(index, value)
     raise "#{self.class} does not support #{value.class} params"
   end