宏定义小方法

#define WRITE_MSG "cmd=write&"
#define READ_MSG "cmd=read&"

#define SET_VALUE(index, value) WRITE_MSG #index "=" #value

#define DATABASE_TABLE "system"

#define QUERY_SQLITE(index) \ "SELECT * FROM" DATABASE_TABLE "WHERE ID=\'" #index "\'"

#define UPDATE_SQLITE(index, value) \ "UPDATE " DATABASE_TABLE " SET VALUE =" #value " WHERE ID=" #index