Fix building agains pre mysql 5.7

Author: silvakid

driver/mysql_connection_options.h

@@ -54,9 +54,11 @@ enum MySQL_Connection_Options
   MYSQL_ENABLE_CLEARTEXT_PLUGIN,
   MYSQL_OPT_CAN_HANDLE_EXPIRED_PASSWORDS,
   MYSQL_OPT_SSL_ENFORCE,
+#if LIBMYSQL_VERSION_ID > 50700
   MYSQL_OPT_MAX_ALLOWED_PACKET, MYSQL_OPT_NET_BUFFER_LENGTH,
   MYSQL_OPT_TLS_VERSION,
   MYSQL_OPT_SSL_MODE
+#endif //LIBMYSQL_VERSION_ID > 50700
 };
 
 }

driver/mysql_resultbind.cpp

@@ -86,8 +86,10 @@ static struct st_buffer_size_type
     case MYSQL_TYPE_BLOB:
     case MYSQL_TYPE_STRING:
     case MYSQL_TYPE_VAR_STRING:
+#if LIBMYSQL_VERSION_ID > 50700
     case MYSQL_TYPE_JSON:
       return st_buffer_size_type(new char[field->max_length + 1], field->max_length + 1, field->type);
+#endif //LIBMYSQL_VERSION_ID > 50700
 
     case MYSQL_TYPE_DECIMAL:
     case MYSQL_TYPE_NEWDECIMAL:

driver/mysql_util.cpp

@@ -431,8 +431,10 @@ mysql_type_to_datatype(const MYSQL_FIELD * const field)
       return sql::DataType::SET;
     case MYSQL_TYPE_GEOMETRY:
       return sql::DataType::GEOMETRY;
+#if LIBMYSQL_VERSION_ID > 50700
     case MYSQL_TYPE_JSON:
       return sql::DataType::JSON;
+#endif //LIBMYSQL_VERSION_ID > 50700
     default:
       return sql::DataType::UNKNOWN;
   }
@@ -645,8 +647,10 @@ mysql_type_to_string(const MYSQL_FIELD * const field, boost::shared_ptr< sql::my
       return "SET";
     case MYSQL_TYPE_GEOMETRY:
       return "GEOMETRY";
+#if LIBMYSQL_VERSION_ID > 50700
     case MYSQL_TYPE_JSON:
       return "JSON";
+#endif //LIBMYSQL_VERSION_ID > 50700
     default:
       return "UNKNOWN";
   }