sqlite_fetch_single
SQLiteResult->fetchSingle
SQLiteUnbuffered->fetchSingle
(PHP 5, PECL sqlite >= 1.0.1)
sqlite_fetch_single -- SQLiteResult->fetchSingle -- SQLiteUnbuffered->fetchSingle — Fetches the first column of a result set as a string
说明
string sqlite_fetch_single ( resource $result [, bool $decode_binary = true ] )Object oriented style (method):
string SQLiteResult::fetchSingle ([ bool $decode_binary = true ] ) string SQLiteUnbuffered::fetchSingle ([ bool $decode_binary = true ] )sqlite_fetch_single() is identical to sqlite_fetch_array() except that it returns the value of the first column of the rowset.
This is the most optimal way to retrieve data when you are only interested in the values from a single column of data.
参数
- result
-
The SQLite result resource. This parameter is not required when using the object-oriented method.
- decode_binary
-
当 decode_binary 参数设置为 TRUE（默认值）时，PHP 会解码那些由 sqlite_escape_string() 编码后的二进制数据。通常应保留此值为其默认值，除非要与其他使用 SQLlite 的应用程序建立的数据交互。
返回值
Returns the first column value, as a string.
范例
Example #1 A sqlite_fetch_single() example
<?php
if ($dbhandle = sqlite_open('mysqlitedb', 0666, $sqliteerror)) {
$sql = "SELECT id FROM sometable WHERE id = 42";
$res = sqlite_query($dbhandle, $sql);
if (sqlite_num_rows($res) > 0) {
echo sqlite_fetch_single($res); // 42
}
sqlite_close($dbhandle);
}
?>
参见
- sqlite_fetch_array() - Fetches the next row from a result set as an array
