我想将论坛分组,如下所示:
我目前有一个名为forum_categories
的数据库表,它采用标题并为创建的所有类别创建一个ID。我在名为forum_forums
的数据库表中也有一个列(我要分类的所有不同论坛),其中包含一个名为category_apart_of
的值。
我如何在正确的类别ID中列出论坛?
非常感谢你!
如果您想查看我的任何代码,或者想让我更深入地解释一下,请告诉我。
我目前列出论坛的代码(注意:获取所有论坛的SQL查询都在上面):
<thead>
<tr>
<th style="width: 50%;">Forum</th>
<th style="width: 10%;">Threads</th>
<th style="width: 10%;">Posts</th>
<th style="width: 30%;">Latest Posts</th>
</tr>
</thead>
<tbody>
<?php
while($row = $stmt->fetch(PDO::FETCH_ASSOC)) {
$forumID = $row['forumID'];
$forum_title[] = $row['forum_title'];
$forum_description[] = $row['forum_description'];
$forum_total_threads[] = $row['forum_total_threads'];
$forum_total_posts[] = $row['forum_total_posts'];
$forum_latest_thread[] = $row['forum_latest_thread'];
$stmt2 = $db->prepare("SELECT * FROM forum_threads WHERE forum_thread_belongs_to = '$forumID'");
$stmt2->execute();
$count = $stmt2->rowCount();
echo '
<tr><td><h4 style="margin-bottom: 0px;"><a style="margin-bottom: 0px;" href="forum.php?id='
. $row['forumID'] . ' ">'.$row['forum_title']
. '</a></h4><br /><h6 style="margin-bottom: 0px; margin-top: 0px;">'
.$row['forum_description'].'</h6></td><td style="text-align: center;><span">'.$count
.'</span></td><td style="text-align: center;><span">'.$row['forum_total_posts']
.'</span></td><td>'.$row['forum_latest_thread'].'</td></tr>
';
}
?>
</tbody>
两个表的DDL:
CREATE TABLE IF NOT EXISTS `forum_forums` (
`forumID` int(11) NOT NULL AUTO_INCREMENT,
`forum_title` varchar(255) NOT NULL,
`forum_description` varchar(255) NOT NULL DEFAULT 'This forum does not have a description',
`forum_total_threads` int(255) NOT NULL DEFAULT '0',
`forum_total_posts` int(255) NOT NULL DEFAULT '0',
`forum_latest_thread` varchar(255) NOT NULL DEFAULT 'There are no new threads',
`forum_apart_of` int(11) NOT NULL,
`category_apart_of` int(11) NOT NULL,
PRIMARY KEY (`forumID`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=1 ;
CREATE TABLE IF NOT EXISTS `forum_categories` (
`catID` int(11) NOT NULL AUTO_INCREMENT,
`cat_title` varchar(255) NOT NULL,
PRIMARY KEY (`catID`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=1 ;
答案 0 :(得分:1)
您的问题:我如何以正确的类别ID列出论坛?
解决方案:
由于您已经拥有数据库结构,并且您已经并且应该知道为了将import { Component, OnInit} from 'angular2/core'
import { ROUTER_DIRECTIVES } from 'angular2/router'
import { Card } from './card'
import { CardService } from './card.service'
import { CardFilterPipe } from './card-filter.pipe'
@Component({
templateUrl: 'app/card/card-list.component.html',
directives: [ROUTER_DIRECTIVES],
pipes: [CardFilterPipe]
})
export class CardListComponent implements OnInit {
pageTitle: string = 'Card List';
cards: Card[];
errorMessage: string;
listFilter: string;
constructor(private _cardService: CardService) { }
ngOnInit(): void {
this.getCards();
}
getCards() {
this._cardService.getCards()
.subscribe(
result => this.cards = result,
error => this.errorMessage = <any>error);
}
}
表与您的categories
表链接起来,您需要在两个类似的列中至少有一列是{{{ 1}}从forums
表自动递增列,即category_id
,因此,为了将论坛分类为特定类别,您需要将类别categories
添加到额外列{在您的id
表格中{1}},以便每个论坛都有ID值中提到的类别..!
然后您可以按类别列出您的论坛:
注意:此代码将检查每个论坛类别,它会列出每个类别下的所有论坛..!
id
工作代码示例:
category_id
输出:
forums