返回表示结果集中字段的对象数组,然后打印每个字段的名称、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 all fields
$fieldinfo = $result -> fetch_fields();
foreach ($fieldinfo as $val) {
printf("Name: %s\n", $val -> name);
printf("Table: %s\n", $val -> table);
printf("Max. Len: %d\n", $val -> max_length);
}
$result -> free_result();
}
$mysqli -> close();
?>
查看底部的程序样式示例。
fetch_fields() / mysqli_fetch_fields() 函数返回表示结果集中字段的对象数组。
$mysqli_result -> fetch_fields()
mysqli_fetch_fields(
result)
Parameter | Description |
---|---|
result | Required. Specifies a result set identifier returned by mysqli_query(), mysqli_store_result() or mysqli_use_result() |
返回值: | 返回包含字段定义信息的对象数组。如果没有可用信息,则为 FALSE。这些对象具有以下属性:
|
---|---|
PHP 版本: | 5+ |
返回表示结果集中字段的对象数组,然后打印每个字段的名称、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 all fields
$fieldinfo = mysqli_fetch_fields($result);
foreach ($fieldinfo as $val) {
printf("Name: %s\n", $val->name);
printf("Table: %s\n", $val->table);
printf("Max. Len: %d\n", $val->max_length);
}
mysqli_free_result($result);
}
mysqli_close($con);
?>
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