PHP mysqli_field_seek() 函数
实例
设置结果集中第一个字段（列）的字段指针，然后通过 mysqli_fetch_field() 获取字段信息并输出字段名称、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 info for 1st column ("Lastname")
mysqli_field_seek($result,0);
$fieldinfo=mysqli_fetch_field($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 info for 1st column ("Lastname")
mysqli_field_seek($result,0);
$fieldinfo=mysqli_fetch_field($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_field_seek() 函数把字段指针设置为指定字段的偏移量。
语法
mysqli_field_seek(result,fieldnr);
| 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。 |
| fieldnr | 必需。规定字段号。必须介于 0 和 字段数-1 之间。 |
技术细节
| 返回值： | 如果成功则返回 TRUE，如果失败则返回 FALSE。 |
|---|---|
| PHP 版本： | 5+ |
PHP MySQLi 参考手册