[do_postgres] Revert "Added proper typecasting for doubles passed as …

…string"

* Coersion should take place at a DataMapper-level. I don't yet
  understand the use-case for this at a DataObjects-level.

This reverts commit a5f5c83.

Conflicts:

	do_sqlite3/spec/spec_helper.rb

[#1142 state:hold]

Signed-off-by: Alex Coles <alex@alexcolesportfolio.com>

do_postgres/ext-java/src/main/java/do_postgres/PostgresDriverDefinition.java

@@ -79,27 +79,11 @@ public void setPreparedStatementParam(PreparedStatement ps,
         case STRING:
             jdbcType = ps.getParameterMetaData().getParameterType(idx);
             switch (jdbcType) {
-            //  TODO
-            //  May be added in the future for optimization (String parameter -> String column)
-            //  in case we will have many 'cases' here
-            //  case Types.VARCHAR:
-            //  ps.setString(idx, arg.toString());
-            //  break;
             case Types.INTEGER:
                 // conversion for '.execute_reader("2")'
                 ps.setInt(idx, Integer.valueOf(arg.toString()));
                 break;
-            case Types.FLOAT:
-                // conversion for '.execute_reader("2.1")'
-                ps.setFloat(idx, Float.valueOf(arg.toString()));
-                break;
-            case Types.DOUBLE:
-                // conversion for '.execute_reader("2.1")'
-                ps.setDouble(idx, Double.valueOf(arg.toString()));
-                break;
             default:
-                // String parameter -> {String, other type} column
-                // XXX Please look at line #82
                 ps.setString(idx, arg.toString());
             }
             break;