Question

我有以下程序名为 DBAccess.h

#ifndef DBAccess1_HH
#define DBAccess1_HH

#include <iostream>
#include <sqlite3.h>
#include <string>
#include <list>
#include <iterator>
#include <algorithm>
#include <string>
#include <cstring>

using namespace std;

struct InOut_Schedular_Settings
{
    string inout_ID;
    string inout_FromTime; 
    string inout_ToTime;
    string inout_InOutMode;
};

class sqliteDB {

    public:
        int rc;
        char *zErrMsg;
        sqlite3 *db;
        const char *sql;
        sqlite3_stmt * stmt;

const char* InOut_Schedular_Settings(const char* buffer1,const char* buffer2, const char* buffer3)
{
        //====SOME CODE TO ACCESS SQLITE DATABASE====//
}


231    list<InOut_Schedular_Settings> GET_InOut_Schedular_Settings(const char* buffer1)
232     {

238    list<InOut_Schedular_Settings> InOut_Schedular_Settings_list;

       int rc = sqlite3_open("/DBsqlite3/empdbv3.db", &db);

       sql = "SELECT * FROM InOutTimeM WHERE ID= @ID;";

       rc = sqlite3_prepare_v2(db, sql, -1, &stmt, 0);

       int Code_x1 = sqlite3_bind_parameter_index(stmt, "@ID");

       if(sqlite3_step(stmt)==SQLITE_ROW) {

           int column = sqlite3_column_count(stmt);

           for(int i = 0; i < column; i++)
           {
               std::string A = std::string(reinterpret_cast<const char*>(sqlite3_column_text(stmt, 0)));
               std::string B = std::string(reinterpret_cast<const char*>(sqlite3_column_text(stmt, 1)));
               std::string C = std::string(reinterpret_cast<const char*>(sqlite3_column_text(stmt, 2)));
               std::string D = std::string(reinterpret_cast<const char*>(sqlite3_column_text(stmt, 3)));

288            InOut_Schedular_Settings info; //Creating list object "info"
289            info.inout_ID = A;
290            info.inout_FromTime = B;
291            info.inout_ToTime = C;
292            info.inout_InOutMode = D;             

294            cout<<"Preparing to push data into List"<<endl;
295            InOut_Schedular_Settings_list.push_back(info);
               cout<<"Data was pushed successfully"<<endl;
           }

       }
       else {
            cout<<"\nERROR while fetching record from the InOutTimeM table[ " << sqlite3_errmsg(db) << " ]" << endl;
       }

       sqlite3_finalize(stmt);
       sqlite3_close(db);

       return InOut_Schedular_Settings_list;

   }

我调用此DBAccess.h的程序如下 main.cpp

#include <iostream>
#include <sqlite3.h>
#include <stdlib.h>
#include <list>
#include <iterator>
#include <algorithm>
#include <cstring>
#include <unistd.h>
#include <string>
#include <cstdio>
#include <sstream>
#include <cctype>
#include <cstdlib>

#include "DBAccess.h"
using namespace std ;

int main()
{
    sqliteDB object1;

    const char* value1= "2";

    object1.GET_InOut_Schedular_Settings(value1);

    cout << "\n\nAll the statement were executed properly\n\n";

    return 0;
}

编译时的程序会出现以下错误：

DBAccess.h:231:30: error: type/value mismatch at argument 1 in template parameter list for ‘template<class _Tp, class _Alloc> class std::list’
 list<InOut_Schedular_Settings> GET_InOut_Schedular_Settings(const char* buffer1)
                          ^
DBAccess.h:231:30: error:   expected a type, got ‘sqliteDB::InOut_Schedular_Settings’
DBAccess.h:231:30: error: template argument 2 is invalid
DBAccess.h: In member function ‘int sqliteDB::GET_InOut_Schedular_Settings(const char*)’:
    DBAccess.h:238:31: error: type/value mismatch at argument 1 in template parameter list for ‘template<class _Tp, class _Alloc> class std::list’
  list<InOut_Schedular_Settings> InOut_Schedular_Settings_list;
                           ^
DBAccess.h:238:31: error:   expected a type, got ‘sqliteDB::InOut_Schedular_Settings’
DBAccess.h:238:31: error: template argument 2 is invalid
DBAccess.h:238:62: error: invalid type in declaration before ‘;’ token
 list<InOut_Schedular_Settings> InOut_Schedular_Settings_list;
                                                          ^
DBAccess.h:288:29: error: expected ‘;’ before ‘info’
InOut_Schedular_Settings info; //Creating list object "info"
                         ^
DBAccess.h:288:33: error: invalid use of non-static member function
InOut_Schedular_Settings info; //Creating list object "info"
                             ^
DBAccess.h:289:4: error: ‘info’ was not declared in this scope
info.inout_ID = A;
^
DBAccess.h:295:34: error: request for member ‘push_back’ in ‘InOut_Schedular_Settings_list’, which is of non-class type ‘int’
InOut_Schedular_Settings_list.push_back(info);

我知道，我必须提供typename，并声明模板＆lt;＆gt ;.但不幸的是，我无法做到正确。如果你能提供帮助，我将非常感谢。谢谢。

注意：我知道在.h文件中定义一个函数本身就是不好的做法。我稍后会制作另一个.cpp文件。

Answer 1

发布我自己问题的答案真的很愚蠢。我犯的错误实在太傻了。

如果您注意到功能 -

const char* InOut_Schedular_Settings

与我的列表名称相同：

231    list<InOut_Schedular_Settings>
238    list<InOut_Schedular_Settings> InOut_Schedular_Settings_list;

我所要做的就是更改函数名称：

const char* InOut_Schedular_Settings

到（别的）

const char* InOut_Schedular_Settings1

抱歉这么不耐烦。

错误：模板参数列表中参数1的类型/值不匹配'template <class _tp，=“”class =“”_ alloc =“”> class std :: list'</class>

1 个答案: