mysqli_fetch_row只适用于第一行

-2

这是我做SQL的第三天，我相信它确实很小。mysqli_fetch_row只适用于第一行

我有这段代码。 $ con是我的SQL连接变量。

for ($i = 0; $i < mysqli_num_rows(mysqli_query($con, "SELECT * FROM offers WHERE active='y'")); $i++) 
{ 
    echo '<div class="dottedBox">User: '.mysqli_fetch_row(mysqli_query($con, "SELECT poster FROM offers WHERE active='y'"))[$i]."<br> 
    Has: ".mysqli_fetch_row(mysqli_query($con, "SELECT haveamt FROM offers WHERE active='y'"))[$i]." ".mysqli_fetch_row(mysqli_query($con, "SELECT have FROM offers WHERE active='y'"))[$i].'<br> 
    Wants: '.mysqli_fetch_row(mysqli_query($con, "SELECT wantamt FROM offers WHERE active='y'"))[$i].' '.mysqli_fetch_row(mysqli_query($con, "SELECT want FROM offers WHERE active='y'"))[$i].'</div><br>'; 
}

第一项输出正常。然而，每个后续项目将导致以下错误：

Notice: Undefined offset: 1 in /var/www/civ/index.php on line 6 

Notice: Undefined offset: 1 in /var/www/civ/index.php on line 7 

Notice: Undefined offset: 1 in /var/www/civ/index.php on line 7 

Notice: Undefined offset: 1 in /var/www/civ/index.php on line 8 

Notice: Undefined offset: 1 in /var/www/civ/index.php on line 8

运行SELECT * FROM offers;回报这在MySQL（我使用Debian）：

mysql> SELECT * FROM offers; 
+----------+-----------+---------+-----------+---------+---------+--------+ 
| poster | have  | haveamt | want  | wantamt | offerid | active | 
+----------+-----------+---------+-----------+---------+---------+--------+ 
| minicl55 | gfdsafdsa |  3 | fdsafdsa |  2 |  1 | y  | 
| minicl55 | jklgdsa |  324 | jfklsdjkl | 4522 |  2 | y  | 
+----------+-----------+---------+-----------+---------+---------+--------+

我有两个问题：

为什么不正确输出
我该如何解决这个问题？

来源

2014-10-09 Frank

您的代码正在重新运行每个for循环中的SQL查询。看来你甚至试图用新的查询单独获取每一列 - 而不是仅仅获取一个数组。 – mario 2014-10-09 23:29:14

您正在查询循环中每个值的数据库。您只需要查询一次数据库，然后循环显示结果。

$result = mysqli_query($con, "SELECT * FROM offers WHERE active='y'"); 

while ($row = mysqli_fetch_assoc($result)) 
{ 
    echo '<div class="dottedBox">User: '.$row['poster']."<br> 
    Has: ".$row['haveamt']." ".$row['offers'].'<br> 
    Wants: '.$row['wantamt'].' '.$row['offers'].'</div><br>'; 
}

来源

2014-10-09 23:30:56 slapyo

是的，修复它，谢谢。顺便说一句，你有一个额外的{第三（或第四取决于你如何编写代码）。我无法编辑它，因为它少于7个字符 – Frank 2014-10-09 23:32:38

哎呀，谢谢你的发现。我修好了它。 – slapyo 2014-10-09 23:34:32

mysqli_fetch_row只适用于第一行

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