mysql - C API：在mysql查询中使用变量

Question

我试图在这个函数中调用我的 str 日期变量：

int main(int argc, char **argv)
{ 
  int status = 0;   
  char query[300], data[15], hora[10];
  strDataHora(data, hora);
  printf("Date: %s\n", data);
  MYSQL *con = mysql_init(NULL);  

  if (con == NULL)
  {
      fprintf(stderr, "mysql_init() failed\n");
      exit(1);
  }  

 if (mysql_real_connect(con, "localhost", "root", "ufmg3duc", 
         "stream_net", 0, NULL, CLIENT_MULTI_STATEMENTS) == NULL) 
  {
      finish_with_error(con);
  }    

 if (mysql_query(con, "SELECT Id FROM audiencia WHERE data LIKE ('%s') AND (hora LIKE ('%:00:%') OR hora LIKE ('%:30:%')) AND hora > '03:01'",data))

  {
      finish_with_error(con);
  }

但我不知道如何在 mysql_query 中调用“日期”：

 if (mysql_query(con, "SELECT Id FROM audiencia WHERE data LIKE ('%s') AND (hora LIKE ('%:00:%') OR hora LIKE ('%:30:%')) AND hora > '03:01'",data))

当我的实际日期是 str 变量类型时，如何选择 Id？

Answer 1

您必须将此查询存储在一个变量中（例如，使用sprintfor snprintf）并%使用%%

char query[300];
...
sprintf(query, "SELECT Id FROM audiencia WHERE data LIKE ('%s') ...", data);
mysql_query(con, query);