計數功能不計算數據庫表中的所有行

Question

我正在嘗試使用count函數來計算表中的行數。 我目前在該表中有5行。 但是，計數功能僅計數1行。 為什么是這樣？ 有什么建議么。

 $count_pcode = mysqli_query($dbc, "SELECT COUNT(*)FROM Delivery_Pcode");
 $count_row =mysqli_num_rows($count_pcode);
 printf("%d results.\n",$count_row);
 mysqli_free_result($count_pcode );
 mysqli_close($dbc);

Answer 1

只需將第一行更改為：

$count_pcode = mysqli_query($dbc, "SELECT * FROM Delivery_Pcode");

然后，下一行代碼將告訴您查詢返回多少行

$count_row =mysqli_num_rows($count_pcode);

Answer 2

此代碼應計算行數，並有效地進行計數。

$result = mysql_query($dbc, "SELECT COUNT(*)FROM Delivery_Pcode");

// Verify it worked
if (!$result) echo mysql_error();

$row = mysql_fetch_row($result);

// Should show you an integer result.
print_r($row);

mysqli_free_result($result);
mysqli_close($dbc);

Answer 3

請嘗試以下操作：

$count_pcode = mysqli_query($dbc, "SELECT * FROM Delivery_Pcode");
$count_row = mysqli_num_rows($count_pcode);