fbsql_num_rows

(PHP 4 >= 4.0.6, PHP 5, PHP 7)

fbsql_num_rows — Get number of rows in result

说明

fbsql_num_rows ( resource $result ) : int

Gets the number of rows in the given result set.

This function is only valid for SELECT statements. To retrieve the number of rows returned from a INSERT, UPDATE or DELETE query, use fbsql_affected_rows().

参数

result: 由 fbsql_query() 或 fbsql_db_query() 返回的结果标识符。

返回值

Returns the number of rows returned by the last SELECT statement.

范例

Example #1 fbsql_num_rows() example


<?php

$link = fbsql_connect("localhost", "username", "password");
fbsql_select_db("database", $link);

$result = fbsql_query("SELECT * FROM table1;", $link);
$num_rows = fbsql_num_rows($result);

echo "$num_rows Rows\n";

?>

参见

fbsql_affected_rows() - Get number of affected rows in previous FrontBase operation
fbsql_connect() - Open a connection to a FrontBase Server
fbsql_select_db() - Select a FrontBase database
fbsql_query() - Send a FrontBase query

add a note

User Contributed Notes 1 note

down

daggillies at yahoo dot com ¶

17 years ago


Note that this function will not always return the actual size of a result set. For example, if you are doing a two-table join along the lines of "SELECT * FROM T1,T2 where T1.x=T2.x" you will get a result of -1. This is due to the 'lazy execution' model in FrontBase whereby result rows are only returned as you request them. If you absolutely have to have the number of rows in advance then you will have to use COUNT(*) first. Most of the time you do not need to know the exact number of rows; it is good enough to know if the size of the result set is non-zero.

David Gillies
San Jose
Costa Rica

add a note

官方地址：https://www.php.net/manual/en/function.fbsql-num-rows.php

有任何技术问题请点击这里网站运营推广招聘

IT PHP 编程语言 Linux 开发编程科技 Elasticsearch HTML/CSS/XML 网络数据库 JAVA 面试 NoSQL C/C++ Golang Git 算法操作系统正则表达式 Redis 互联网 MySql JavaScript 运维软件国际架构设计 Mac OS TCP/IP Excel Vim Windows Socket Oracle VR MongoDB Python 运营 MemCache 商业硬件电子娱乐设计 nginx 摄影游戏 WordPress HTTP 团建数码电器

php7 安装fileinfo扩展 preg_split — 通过一个正则表达式分隔字符串 php位值,解决 PHP 中 usort 在值相同时改变原始位置的问题 [PHP] inet_pton/inet_ntop IP地址转换函数 [鸟哥]PHP_INT_MIN 和 -9223372036854775808 PHP 8.1 ADORecordSet对象 adodb手册 opcache预加载 Composer的Packagist资源 array_multisort() 多字段排序 PHPMailer设置utf8 PHPMailer字符集CharSet mysql面试题 PHP json解析（json_decode）页面工具 php中几种注释规范 php上周一、本周一、下周一日期 php扩展开发 [原创]诡异的php-fpm超时问题 php设置cookie为httponly防止xss攻击两千行PHP学习笔记

略微加速

PHP官方手册 - 互联网笔记

fbsql_num_rows

说明

参数

返回值

范例

参见

User Contributed Notes 1 note