mysqli_result 类

    (PHP 5, PHP 7, PHP 8)

    简介

    代表从一个数据库查询中获取的结果集。

    类摘要

    class mysqli_result implements IteratorAggregate {
    /* 属性 */
    public readonly int $current_field;
    public readonly int $field_count;
    public readonly ?array $lengths;
    public readonly int|string $num_rows;
    public int $type;
    /* 方法 */
    public __construct(mysqli $mysql, int $result_mode = MYSQLI_STORE_RESULT)
    public data_seek(int $offset): bool
    public fetch_all(int $mode = MYSQLI_NUM): array
    public fetch_array(int $mode = MYSQLI_BOTH): array|null|false
    public fetch_assoc(): array|null|false
    public fetch_column(int $column = 0): null|int|float|string|false
    public fetch_field(): object|false
    public fetch_field_direct(int $index): object|false
    public fetch_fields(): array
    public fetch_object(string $class = "stdClass", array $constructor_args = []): object|null|false
    public fetch_row(): array|null|false
    public field_seek(int $index): true
    public free(): void
    public close(): void
    public free_result(): void
    public getIterator(): Iterator
    }

    属性

    type

    存储的是否为缓冲的结果，int 形式（分别是 MYSQLI_STORE_RESULT 或 MYSQLI_USE_RESULT）。

    更新日志

    版本 说明
    8.0.0 mysqli_result 现在实现 IteratorAggregate。之前实现的是 Traversable。

    目录

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    用户贡献的备注 4 notes

    up
    70
    tuxedobob
    12 years ago
    Converting an old project from using the mysql extension to the mysqli extension, I found the most annoying change to be the lack of a corresponding mysql_result function in mysqli. While mysql_result is a generally terrible function, it was useful for fetching a single result field *value* from a result set (for example, if looking up a user's ID).

    The behavior of mysql_result is approximated here, though you may want to name it something other than mysqli_result so as to avoid thinking it's an actual, built-in function.

    <?php
    function mysqli_result($res, $row, $field=0) {
    $res->data_seek($row);
    $datarow = $res->fetch_array();
    return     $datarow[$field];
    }
    ?>

    Implementing it via the OO interface is left as an exercise to the reader.
    up
    18
    Cem Kayali / cemkayali(a)eticaret.com.tr
    6 years ago
    Switching from Php5 to Php7, especially if you have worked on an ongoing, long term project, it is unfortunate that there is no mysqli_result function.

    So, this may be helpfull and you can call this function as you wish. I assume you do restricted search (searching for single row or few rows only).

    function mysqli_result($search, $row, $field){
    $i=0; while($results=mysqli_fetch_array($search)){
    if ($i==$row){$result=$results[$field];}
    $i++;}
    return $result;}

    Simply;

    $search=mysqli_query($connection, "select name from table_name where id='7'");
    $name=mysqli_result($search, 0, "id");

    Best wishes,
    up
    14
    Marc17
    10 years ago
    An "mysqli_result" function where $field can be like table_name.field_name with alias or not.
    <?php
    function mysqli_result($result,$row,$field=0) {
    if (    $result===false) return false;
    if (    $row>=mysqli_num_rows($result)) return false;
    if (    is_string($field) && !(strpos($field,".")===false)) {
    $t_field=explode(".",$field);
    $field=-1;
    $t_fields=mysqli_fetch_fields($result);
    for (    $id=0;$id<mysqli_num_fields($result);$id++) {
    if (    $t_fields[$id]->table==$t_field[0] && $t_fields[$id]->name==$t_field[1]) {
    $field=$id;
    break;
    }
    }
    if (    $field==-1) return false;
    }
    mysqli_data_seek($result,$row);
    $line=mysqli_fetch_array($result);
    return isset(    $line[$field])?$line[$field]:false;
    }
    ?>
    up
    1
    blar at blar dot de
    15 years ago
    Extending the MySQLi_Result

    <?php

    class Database_MySQLi extends MySQLi
    {
    public function     query($query)
    {
    $this->real_query($query);
    return new     Database_MySQLi_Result($this);
    }
    }

    class     Database_MySQLi_Result extends MySQLi_Result
    {
    public function     fetch()
    {
    return     $this->fetch_assoc();
    }

    public function     fetchAll()
    {
    $rows = array();
    while(    $row = $this->fetch())
    {
    $rows[] = $row;
    }
    return     $rows;
    }
    }

    ?>
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