计数函数不计算db表中的所有行

Question

我正在尝试使用count函数计算表中的行数。我目前在表中有5行。但是计数功能只计算1行。为什么是这样？任何建议。

 $count_pcode = mysqli_query($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

只需将第一行更改为：

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

下一行代码将告诉您查询返回的行数

$count_row =mysqli_num_rows($count_pcode);

Answer 2

此代码应计算行数，并有效地执行此操作。

$result = mysql_query($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

尝试以下方法：

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