将字段光标设置到结果集中的第二列("Age"),使用 fetch_field() 获取字段信息,然后打印字段的名称、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();
?>
查看底部的程序样式示例。
field_seek() / mysqli_field_seek() 函数将字段光标设置为给定的字段偏移量。
$mysqli_result -> field_seek(
fieldnr)
mysqli_field_seek(
result, fieldnr)
Parameter | Description |
---|---|
result | Required. Specifies a result set identifier returned by mysqli_query(), mysqli_store_result() or mysqli_use_result() |
fieldnr | Required. Specifies the field number. Must be an integer from 0 to number of fields-1 |
返回值: | 成功则为真。失败时为 FALSE |
---|---|
PHP 版本: | 5+ |
将字段光标设置到结果集中的第二列("Age"),使用 mysqli_fetch_field() 获取字段信息,然后打印字段的名称、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);
?>
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