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C++ 拼接字符串的两种方法

IT影子 2022-10-09 阅读 193


#include <iostream>
#include <iomanip>
#include <cstdio>
#include <cstring>
#include <sstream>


using namespace std;

template <typename T>
string toString(const T& t,const int w=0)
{
stringstream ss;
string str;
ss<<setw(w)<<setfill('0')<<t;
ss>>str;
return str;
}

int main()
{
int uid = 10089;
char query_sql[1024];
memset(query_sql, 0x00, sizeof(query_sql));
sprintf( query_sql, " SELECT * FROM `some_table` WHERE `User_Id` = %d " , uid );

printf("%s\n", query_sql);


string sql;
sql = " SELECT * FROM `some_table` WHERE `User_Id` = " + toString(uid) ;

cout << sql << endl;


return 0;
}


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