Php/func mysqli field seek
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PHP mysqli field_seek()函数
示例-面向对象的样式
将字段光标设置到结果集中的第二列(“年龄”),使用fetch_field()获取字段信息,然后打印该字段的名称,表和最大长度:
<?php $mysqli = new mysqli("localhost","my_user","my_password","my_db"); if ($mysqli -> connect_errno) { echo "Failed to connect to MySQL: " . $mysqli -> connect_error; exit(); } $sql = "SELECT Lastname, Age FROM Persons ORDER BY Lastname"; if ($result = $mysqli -> query($sql)) { // Get field information for second column $result = field_seek(1); $fieldinfo = $result -> fetch_field(); printf("Name: %s\n", $fieldinfo -> name); printf("Table: %s\n", $fieldinfo -> table); printf("Max. Len: %d\n", $fieldinfo -> max_length); $result -> free_result(); } $mysqli -> close(); ?>
在底部查看程序样式的示例。
定义和用法
field_seek()/ mysqli_field_seek()函数将字段光标设置为给定的字段偏移量。
句法
面向对象的样式:
$mysqli_result -> field_seek(fieldnr)
程序风格:
mysqli_field_seek(result, fieldnr)
参数值
参数 | 描述 |
---|---|
result | 需要。指定mysqli_query(),mysqli_store_result()或mysqli_use_result()返回的结果集标识符 |
fieldnr | 需要。指定字段号。必须是0到之间的整数
number of fields -1 |
技术细节
返回值: | 成功则为真。失败时为假 |
PHP版本: | 5+ |
示例-程序风格
将字段光标设置到结果集中的第二列(“年龄”),使用mysqli_fetch_field()获取字段信息,然后打印该字段的名称,表和最大长度:
<?php $con = mysqli_connect("localhost","my_user","my_password","my_db"); if (mysqli_connect_errno()) { echo "Failed to connect to MySQL: " . mysqli_connect_error(); exit(); } $sql="SELECT Lastname, Age FROM Persons ORDER BY Lastname"; if ($result = mysqli_query($con,$sql)) { // Get field information for second column mysqli_field_seek($result, 1); $fieldinfo = mysqli_fetch_field($result); printf("Name: %s\n", $fieldinfo -> name); printf("Table: %s\n", $fieldinfo -> table); printf("max. Len: %d\n", $fieldinfo -> max_length); mysqli_free_result($result); } mysqli_close($con); ?>