PHP mysqli_fetch_field_direct() 函数

实例

返回结果集中某个单一字段（列）的 meta-data，并输出字段名称、表格和最大长度：

<?php
$con=mysqli_connect("localhost","my_user","my_password","my_db");
// Check connection
if (mysqli_connect_errno($con))
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}

$sql="SELECT Lastname,Age FROM Persons ORDER BY Lastname";

if ($result=mysqli_query($con,$sql))
{
// Get field information for "Age"
$fieldinfo=mysqli_fetch_field_direct($result,1);

printf("Name: %sn",$fieldinfo->name);
printf("Table: %sn",$fieldinfo->table);
printf("max. Len: %dn",$fieldinfo->max_length);

// Free result set
mysqli_free_result($result);
}

mysqli_close($con);
?>

定义和用法

mysqli_fetch_field_direct() 函数从结果集中取得某个单一字段（列）的 meta-data，并作为对象返回。

语法

mysqlifetch_field_direct(_result,fieldnr);

技术细节