mysqli_result::field_seek

mysqli_field_seek

(PHP 5, PHP 7)

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

说明

面向对象风格

bool mysqli_result::field_seek ( int $fieldnr )

过程化风格

bool mysqli_field_seek ( mysqli_result $result , int $fieldnr )

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.

Note:

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()返回的结果集标识。

fieldnr

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

返回值

成功时返回 TRUE, 或者在失败时返回 FALSE

范例

Example #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();
?>

Example #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($result1);
    
$finfo mysqli_fetch_field($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);
?>

以上例程会输出:

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

参见

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