1) Fit the precision of floating point to that of server side

(fix by Hiroki kataoka).
2) Ensure the definition of atof()(#include stdlib.h).
  (suggestion by Masaaki Sakaida).

src/interfaces/odbc/convert.c

@@ -42,6 +42,7 @@
 
 #include <time.h>
 #include <math.h>
+#include <stdlib.h>
 #include "convert.h"
 #include "statement.h"
 #include "qresult.h"
@@ -892,12 +893,12 @@ copy_statement_with_parameters(StatementClass *stmt)
 				break;
 
 			case SQL_C_DOUBLE:
-				sprintf(param_string, "%f",
+				sprintf(param_string, "%15g",
 						*((SDOUBLE *) buffer));
 				break;
 
 			case SQL_C_FLOAT:
-				sprintf(param_string, "%f",
+				sprintf(param_string, "%6g",
 						*((SFLOAT *) buffer));
 				break;