dba_firstkey

(PHP 4, PHP 5, PHP 7, PHP 8)

dba_firstkey — 获取第一个键

说明

dba_firstkey(Dba\Connection $dba): string|false

dba_firstkey() 返回数据库的第一个键并重置内部键指针。这允许通过整个数据库进行线性搜索。

参数

dba: 一个由 dba_open() 或 dba_popen() 返回的 Dba\Connection 实例。

返回值

成功时返回键，或者在失败时返回 false。

更新日志

版本	说明
8.4.0	`dba` 参数现在接受 Dba\Connection 实例，之前接受有效的 `dba` resource。

参见

dba_nextkey() - 获取下一个键
dba_key_split() - 将键的字符串表示分割为数组表示
Example 2 in the DBA examples

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用户贡献的备注 3 notes

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jacky dot jackyhung dot net ¶

23 years ago

for ($key = dba_firstkey($this->handle); $key !== false; $key = dba_nextkey($this->handle)) {
            $keyset[] = $key;
        } // end for

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-1

rcracer91 at gmail dot com ¶

15 years ago

I wondered why it wasn't already written, so I did because I think working with associative arrays is always as comfortable as can be

<?php
function dba_fetch_assoc($handle) {
$assoc = array();
    for($k = dba_firstkey($handle); $k != false; $k = dba_nextkey($handle)) {
$assoc[$k] = dba_fetch($k, $handle);
    }
    return $assoc;
}
?>

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-1

psycho-logic at excite dot com ¶

21 years ago

Looks like Jacky is using some DB object? I don't know if it's native to PHP or written on it's own... Anyways this is what I use:

$DBCon = dba_open("/tmp/test_db.db2", "r", "db2") or die("Uh oh, can't open the database :(");
if ($the_key = dba_firstkey($DBCon)) do {
    print("Key: $the_key    Value:");
    print dba_fetch($the_key, $DBCon);
    print("<BR>");
} while ($the_key = dba_nextkey($DBCon));
print ("<BR><BR><BR>Well looks like we're done here :-)");