[GitHub] [shardingsphere] TeslaCN commented on issue #23614: Consider refactoring proxy-mysql-default-version

["TeslaCN (via GitHub)" <gi...@apache.org>]

TeslaCN commented on issue #23614:
URL: https://github.com/apache/shardingsphere/issues/23614#issuecomment-1515957638

   ```cpp
   #include <iostream>
   #include <map>
   #include <string>
   #include "set_var.h"
   #include "sys_vars.h"
   
   using namespace std;
   
   string generateFlag(const sys_var *v);
   
   string generateDefaultValue(sys_var *v);
   
   int main() {
     map<string, string> m;
     for (sys_var *v = all_sys_vars.first; v; v = v->next) {
       string name = v->name.str, generated;
       for (char c : name) {
         generated += (char)toupper(c);
       }
       generated += '(';
       string flag = generateFlag(v);
       generated += flag;
       generated += ", ";
       string def = generateDefaultValue(v);
       generated += def + ')';
       m[name] = ("\"TODO\"" == def ? "// " : "") + generated;
     }
     for (auto &iterator : m) {
       cout << iterator.second << "," << endl << endl;
     }
     return 0;
   }
   
   string generateFlag(const sys_var *v) {
     string flag;
     if (v->scope() & sys_var::GLOBAL) flag += " | Flag.GLOBAL";
     if (v->scope() & sys_var::SESSION) flag += " | Flag.SESSION";
     if (v->scope() & sys_var::ONLY_SESSION) flag += " | Flag.ONLY_SESSION";
     if (v->is_readonly()) flag += " | Flag.READONLY";
     if (v->not_visible()) flag += " | Flag.INVISIBLE";
     if (v->is_trilevel()) flag += " | Flag.TRI_LEVEL";
     if (v->is_hint_updateable()) flag += " | Flag.HINT_UPDATEABLE";
     if (v->is_persist_readonly()) flag += " | Flag.PERSIST_AS_READ_ONLY";
     if (v->is_sensitive()) flag += " | Flag.SENSITIVE";
     return flag.substr(3);
   }
   
   string generateDefaultValue(sys_var *v) {
     stringstream stream;
     stream << '"';
     switch (v->get_option()->var_type) {
       case GET_STR: {
         char *c = reinterpret_cast<char *>(v->get_option()->def_value);
         if (nullptr != c) stream << c;
         break;
       }
       case GET_INT:
       case GET_LONG:
       case GET_LL:
       case GET_UINT:
       case GET_ULONG:
       case GET_ULL:
       case GET_BOOL: {
         stream << v->get_option()->def_value;
         break;
       }
       case GET_DOUBLE: {
         stream << (double)v->get_option()->def_value;
         break;
       }
       default: {
         stream << "TODO";
       }
     }
     stream << '"';
     return stream.str();
   }
   ```


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