Fetch_Assoc() 在非对象上

Question

所以，我收到了这个错误：

Fatal error: Call to a member function fetch_assoc() on a non-object

它说错误在第 220 行。

第220行是：

while ($field = $result->fetch_assoc()) {

$结果：

$tbl_name = "savage";
$sql = "SELECT * FROM $tbl_name LIMIT $start, $limit ORDER BY `id` DESC";
$result = $mysqli->query($sql);

我不确定是因为 $tbl_name 在变量中还是什么，但我不知道如何解决这个问题。可能是一个简单的答案，但希望你能有所帮助！如果我需要提供更多，请告诉我！

忘记包括：

  $limit = 10;
  if(isset($_GET['page'])) {
    $page = $_GET['page'];
    $start = ($page - 1) * $limit;
  } else {
    $page = 0;
    $start = 0;
  }

在这种情况下 $_GET['page'] 未设置。

Answer 1

LIMIT 在 ORDER BY

之后

$sql = "SELECT * FROM $tbl_name ORDER BY `id` DESC LIMIT $start, $limit";

http://dev.mysql.com/doc/refman/5.0/en/select.html

手册中的示例：

SELECT
    [ALL | DISTINCT | DISTINCTROW ]
      [HIGH_PRIORITY]
      [STRAIGHT_JOIN]
      [SQL_SMALL_RESULT] [SQL_BIG_RESULT] [SQL_BUFFER_RESULT]
      [SQL_CACHE | SQL_NO_CACHE] [SQL_CALC_FOUND_ROWS]
    select_expr [, select_expr ...]
    [FROM table_references
    [WHERE where_condition]
    [GROUP BY {col_name | expr | position}
      [ASC | DESC], ... [WITH ROLLUP]]
    [HAVING where_condition]
    [ORDER BY {col_name | expr | position}
      [ASC | DESC], ...]
    [LIMIT {[offset,] row_count | row_count OFFSET offset}]

Fetch_Assoc() 在非对象上

Fetch_Assoc() on Non-Object

php

mysqli