mysqli_result::field_seek

mysqli_field_seek

(PHP 5, PHP 7, PHP 8)

mysqli_result::field_seek -- mysqli_field_seekSet result pointer to a specified field offset

说明

面向对象风格

public mysqli_result::field_seek(int $index): true

过程化风格

mysqli_field_seek(mysqli_result $result, int $index): true

Sets the field cursor to the given offset. The next call to mysqli_fetch_field() will retrieve the field definition of the column associated with that offset.

注意:

To seek to the beginning of a row, pass an offset value of zero.

参数

result

仅以过程化样式:由 mysqli_query()mysqli_store_result()mysqli_use_result()mysqli_stmt_get_result() 返回的 mysqli_result 对象。

index

The field number. This value must be in the range from 0 to number of fields - 1.

返回值

总是返回 true

更新日志

版本 说明
8.0.0 This function now always returns true. Previously it returned false on failure.

示例

示例 #1 面向对象风格

<?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 过程化风格

<?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);
?>

以上示例会输出:

Name:     SurfaceArea
Table:    Country
max. Len: 10
Flags:    32769
Type:     4

参见