1054 where子句中的未知列？

Question

我正在使用以下详细信息更新我的表雇主，但在更新时显示上述错误

  <?php  

      $name=$_POST['name'];
      $phone=$_POST['phone'];
      $lname=$_POST['lname'];
      $stmt = $db->prepare("UPDATE employer 
     SET name='.$name.', phone='.$phone.',lname='.$lanme.' 
      WHERE username=".$_SESSION['username']." ");
      ?>

Answer 1

查询语句未正确连接。这就是问题所在：

int n = 10, val[10], dp[1024];    //set all the values of dp table to -1 initially

int solve(int mask){
    if(__builtin_popcount(mask) == n){
        return 0;
    }
    if(dp[mask] != -1) return dp[mask];

    int prev = 1, ans = 0;
    for(int i = 0;i < n;i++){
        if(((mask >> i) & 1) == 0){ //bit is not set
            //try to shoot current baloon
            int newMask = mask | (1 << i);
            int fwd = 1;
            for(int j = i+1;j < n;j++){
                if(((mask >> j) & 1) == 0){
                    fwd = val[j];
                    break;
                }
            }
            ans = max(ans, solve(newMask) + (prev * fwd));
            prev = val[i];
        }
    }
    return dp[mask] = ans;
}