query(50%)

build.sh

@@ -1 +1 @@
-g++ -o demo main.cc -I/usr/include/mysql -lmysqlclient -std=c++23 -g
+g++ -o sqlconn main.cc -I/usr/include/mysql -lmysqlclient -std=c++23 -g && ./sqlconn

main.cc

@@ -1,6 +1,15 @@
 #include "sqlConnection.h"
+#include <iostream>
+#include <ranges>
+namespace ranges = std::ranges;
+namespace views = std::ranges::views;
+using namespace std;
 
 int main(int argc, char** const argv){
     SqlConnection conn{};
+    auto resp = conn.Connect("192.168.1.17", "3306", "root", "", "mysql");
+//    resp.or_else([](auto err_msg){cout<<err_msg<<"\n";});
+    auto table_result = conn.GetTables();
+    ranges::for_each(table_result, [](auto item){cout<<item<<endl;});
     return 0;
 }

sqlConnection.h

@@ -3,6 +3,8 @@
 #include <algorithm>
 #include <string_view>
 #include <expected>
+#include <format>
+#include <map>
 
 #include "mysql.h"
 
@@ -10,6 +12,31 @@
 
 using util::_support_string;
 
+struct RowItem{
+    std::vector<std::string_view> row;
+};
+
+//Not Implemented;
+class Result{
+    std::vector<std::string_view> fields;
+    std::map<std::string_view, std::vector<std::string_view>> datas;
+    
+public:
+    //get size;
+    size_t size() const{
+        size_t size = 0;
+        for(auto&& [key, value] : datas){
+            if(datas.size() > size) size = datas.size();
+        }
+        return size;
+    }
+    //return fields
+    const std::vector<std::string_view>& get_fields() const {
+        return fields;
+    }
+    
+};
+
 class SqlConnection{
 private:
     MYSQL mysql_client;
@@ -59,8 +86,7 @@ public:
         this->password = util::to_char(_password);
         this->database_name = util::to_char(_database_name);
         if(mysql_real_connect(&mysql_client, ip, username, password, database_name, std::stoi(port), nullptr, 0) == nullptr){
-            auto error_msg = get_error_msg();
+            return std::unexpected(get_error_msg());
-            return std::unexpected(error_msg);
         }
         return true;
     }
@@ -69,9 +95,39 @@ public:
         mysql_close(&mysql_client);
     }
     
-    std::optional<std::vector<std::string_view>> Query(std::string_view command){
+    std::vector<std::string_view> get_fields(std::string_view table_name){
+        std::vector<std::string_view> really_result;
+        std::string command;
+        std::format_to(std::back_inserter(command), "SHOW COLUMNS FROM %s;", table_name);
+        auto _ = mysql_query(&mysql_client, command.c_str());
+        if(auto mysql_result = mysql_store_result(&mysql_client); mysql_result != nullptr){
+            auto field_length = mysql_num_fields(mysql_result);
+            auto row = mysql_fetch_row(mysql_result);
+            for(int i=0; i<field_length; i++){
+                really_result.emplace_back(row[i]);
+            }
+            mysql_free_result(mysql_result);
+        }
+        return really_result;
+    }
+    
+    std::expected<std::map<std::string_view, std::vector<std::string_view>>, std::string_view> Query(std::string_view command){
         //Not Implemented;
-        return std::nullopt;
+        std::map<std::string_view, std::vector<std::string_view>> really_result;
+        mysql_query(&mysql_client, command.data());
+        if(auto mysql_result = mysql_store_result(&mysql_client); mysql_result != nullptr){
+            auto row_length = mysql_fetch_lengths(mysql_result);
+            auto field_length = mysql_num_fields(mysql_result);	
+            while(auto row = mysql_fetch_row(mysql_result)){
+                for(int i=0; i<field_length; i++){
+                    
+                }
+            }
+            
+            mysql_free_result(mysql_result);
+        }
+        
+        return std::unexpected(get_error_msg());
     }
     
     bool Execute(std::string_view command){
@@ -80,8 +136,17 @@ public:
     }
     
     std::vector<std::string_view> GetTables(){
-        //Not Implemented;
+        std::vector<std::string_view> really_result;
-        return std::vector<std::string_view>{};
+        mysql_query(&mysql_client, "SHOW TABLES;");
+        if(auto mysql_result = mysql_store_result(&mysql_client); mysql_result != nullptr){
+            auto row_length = mysql_fetch_lengths(mysql_result);
+            while(auto row = mysql_fetch_row(mysql_result)){
+                really_result.emplace_back(row[0]);
+            }
+            mysql_free_result(mysql_result);
+        }
+
+        return really_result;
     };
     
 };