PHP mysqli_fetch_field() 函数
2018-12-08 18:07 更新
PHP mysqli_fetch_field() 函数
实例
返回结果集中下一字段(列),然后输出每个字段名称、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 all fields
while ($fieldinfo=mysqli_fetch_field($result))
{
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);
?>
$con=mysqli_connect("localhost","my_user","my_password","my_db");
// Check connection
if (mysqli_connect_errno($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 all fields
while ($fieldinfo=mysqli_fetch_field($result))
{
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() 函数从结果集中取得下一字段(列),并作为对象返回。
语法
mysqli_fetch_field(result);
参数 | 描述 |
---|---|
result | 必需。规定由 mysqli_query()、mysqli_store_result() 或 mysqli_use_result() 返回的结果集标识符。 |
技术细节
返回值: | 返回包含字段定义信息的对象。如果没有可用信息则返回 FALSE。该对象有下列属性:
|
---|---|
PHP 版本: | 5+ |
PHP MySQLi 参考手册
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