pg_field_table

(PHP 5 >= 5.2.0, PHP 7, PHP 8)

pg_field_table — Returns the name or oid of the tables field

说明

pg_field_table(PgSql\Result $result, int $field, bool $oid_only = false): string|int|false

pg_field_table() returns the name of the table that field belongs to, or the table's oid if oid_only is true.

参数

result: An PgSql\Result instance, returned by pg_query(), pg_query_params() or pg_execute()(among others).
field: Field number, starting from 0.
oid_only: By default the tables name that field belongs to is returned but if oid_only is set to true, then the oid will instead be returned.

返回值

On success either the fields table name or oid, 或者在失败时返回 false.

更新日志

版本	说明
8.1.0	现在 `result` 参数接受 PgSql\Result 实例，之前接受资源(resource)。

范例

示例 #1 Getting table information about a field


<?php
$dbconn = pg_connect("dbname=publisher") or die("Could not connect");

$res = pg_query($dbconn, "SELECT bar FROM foo");

echo pg_field_table($res, 0);
echo pg_field_table($res, 0, true);

$res = pg_query($dbconn, "SELECT version()");
var_dump(pg_field_table($res, 0));
?>

以上例程的输出类似于：

foo
14379580

bool(false)

注释

注意:
Returning the oid is much faster than returning the table name because fetching the table name requires a query to the database system table.

参见

pg_field_name() - 返回字段的名字
pg_field_type() - 返回相应字段的类型名称

add a note

User Contributed Notes 2 notes

down

strata_ranger at hotmail dot com ¶

13 years ago


pg_field_table is primarily useful for queries that involve joins between multiple tables, e.g:

<?php
$res = pg_query("SELECT table1.foo, table2.bar FROM table1 JOIN table2");
echo pg_field_table($res, 0); // Outputs 'table1'
echo pg_field_table($res, 1); // Outputs 'table2'
?>

However, be aware of a few easy 'gotchas':

1- If your query contains static values in its select-list, pg_field_table() will yield FALSE for those fields (because it was a static value, not one fetched from a table):

<?php
$res = pg_query("SELECT 'foo', bar FROM table");
echo pg_field_table($res, 0); // FALSE
echo pg_field_table($res, 1); // Outputs 'table'
?>

2- If you UNION two queries together from different tables, pg_field_table() will return FALSE for all fields:

<?php
$res = pg_query("(Select foo, bar from table1) UNION (Select foo, bar from table2)");
echo pg_field_table($res, 0); // FALSE
echo pg_field_table($res, 1); // FALSE
?>

down

giultar at gmail dot com ¶

2 years ago


this function return an OID even if your field comes from a view or a select but return FALSE if your field comes from an UNION select

add a note

官方地址：https://www.php.net/manual/en/function.pg-field-table.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 JAVA NoSQL 数据库面试 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 array_multisort() 多字段排序 PHPMailer设置utf8 PHPMailer字符集CharSet ADORecordSet对象 adodb手册 PHP 8.1 [鸟哥]PHP_INT_MIN 和 -9223372036854775808 opcache预加载 Composer的Packagist资源 mysql面试题 [鸟哥]PHP FFI详解 - 一种全新的PHP扩展方式 PHP7添加redis扩展 PHP mkdir()写出来的权限与mode值不符合 Packagist / Composer 中国全量镜像利用php soap实现web service PHP获取指定函数定义在哪个文件中及行号支持php7的性能采集扩展

略微加速

PHP官方手册 - 互联网笔记

pg_field_table

说明

参数

返回值

更新日志

范例

注释

参见

User Contributed Notes 2 notes