mysqli_result::field_seek
(PHP 5, PHP 7)
mysqli_result :: field_seek -- mysqli_field_seek — 将结果指针设置为指定的字段偏移量
描述
面向对象的风格
bool mysqli_result::field_seek ( int $fieldnr )
程序风格
bool mysqli_field_seek ( mysqli_result $result , int $fieldnr )
将字段光标设置为给定的偏移量。下一次调用mysqli_fetch_field()将检索与该偏移量关联的列的字段定义。
注意:为了寻找一行的开始,传递零的偏移值。
参数
`result`
仅过程风格:由mysqli_query(),mysqli_store_result()或mysqli_use_result()返回的结果集标识符。
fieldnr
字段号。该值必须在0到字段数-1的范围内。
返回值
成功返回TRUE
或失败时返回FALSE
。
例子
Example#1面向对象的风格
<?php
$mysqli?=?new?mysqli("localhost",?"my_user",?"my_password",?"world");
/*?check?connection?*/
if?(mysqli_connect_errno())?{
????printf("Connect?failed:?%s\n",?mysqli_connect_error());
????exit();
}
$query?=?"SELECT?Name,?SurfaceArea?from?Country?ORDER?BY?Code?LIMIT?5";
if?($result?=?$mysqli->query($query))?{
????/*?Get?field?information?for?2nd?column?*/
????$result->field_seek(1);
????$finfo?=?$result->fetch_field();
????printf("Name:?????%s\n",?$finfo->name);
????printf("Table:????%s\n",?$finfo->table);
????printf("max.?Len:?%d\n",?$finfo->max_length);
????printf("Flags:????%d\n",?$finfo->flags);
????printf("Type:?????%d\n\n",?$finfo->type);
????$result->close();
}
/*?close?connection?*/
$mysqli->close();
?>
示例#2程序风格
<?php
$link?=?mysqli_connect("localhost",?"my_user",?"my_password",?"world");
/*?check?connection?*/
if?(mysqli_connect_errno())?{
????printf("Connect?failed:?%s\n",?mysqli_connect_error());
????exit();
}
$query?=?"SELECT?Name,?SurfaceArea?from?Country?ORDER?BY?Code?LIMIT?5";
if?($result?=?mysqli_query($link,?$query))?{
????/*?Get?field?information?for?2nd?column?*/
????mysqli_field_seek($result,?1);
????$finfo?=?mysqli_fetch_field($result);
????printf("Name:?????%s\n",?$finfo->name);
????printf("Table:????%s\n",?$finfo->table);
????printf("max.?Len:?%d\n",?$finfo->max_length);
????printf("Flags:????%d\n",?$finfo->flags);
????printf("Type:?????%d\n\n",?$finfo->type);
????mysqli_free_result($result);
}
/*?close?connection?*/
mysqli_close($link);
?>
上面的例子会输出:
Name: SurfaceArea
Table: Country
max. Len: 10
Flags: 32769
Type: 4
本文档系腾讯云开发者社区成员共同维护,如有问题请联系 cloudcommunity@tencent.com