242 lines
5.4 KiB
PHP
242 lines
5.4 KiB
PHP
<?php
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/**
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* ArchiveCategroy - 文档分类类
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*/
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class ArchiveCategory
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{
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//PDO对象
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private $db;
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//数据库中分类表
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public $CategoryTable;
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//分类左值字段名称
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private $fld_left;
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//分类右值字段名称
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private $fld_right;
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//顶级栏目标记字段
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private $fld_tid;
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//输出栏目中的深度信息
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public $DeepTitle;
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function __construct($db){
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$this->db = $db;
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$this->CategoryTable = "ar_category";
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$this->fld_left = "lft";
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$this->fld_right = "rgt";
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$this->fld_tid = "tid";
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$this->DeepTitle = "ROOTDEEP";
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}
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function GetFullCategory()
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{
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return $this->GetCategory(0,'');
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}
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/**
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* GetTree() 获得栏目树
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* 用来获得某个栏目下或者所有栏目的树结构
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*
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* 典型表结构
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* (PostgreSql)
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*
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CREATE TABLE ar_category
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(
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id serial NOT NULL,
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title character varying(80),
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tid integer NOT NULL DEFAULT 0,
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lft integer NOT NULL DEFAULT 0,
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rgt integer NOT NULL DEFAULT 0,
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CONSTRAINT ar_category_pkey PRIMARY KEY (id)
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)
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*
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* @param int $tid
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*
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* @return array;
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*/
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function GetCategory($tid=0,$ptype='news'){
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$left = $this->fld_left;
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$right = $this->fld_right;
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$categoryTable = $this->CategoryTable;
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$tidField = $this->fld_tid;
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$whereSql = array();
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if(!empty($tid))
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{
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$sql = "SELECT $left,$right FROM $categoryTable
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WHERE id=$tid";
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$sth = $this->db->query($sql);
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$row = $sth->fetch();
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$whereSql[] = " $left BETWEEN {$row[$left]} AND {$row[$right]} ";
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}
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if(count($whereSql)>0)
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{
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$whereSql = " WHERE ".join(" AND ",$whereSql);
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}elseif ($ptype<>''){
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$whereSql = " where ptype='$ptype' ";
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} else
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$whereSql='';
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$sql = "SELECT *
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FROM $categoryTable
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$whereSql
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ORDER BY ptype ASC,$left ASC ";
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$sth = $this->db->query($sql);
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$rows = $sth->fetchAll();
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$stack = array();
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$categorys = array();
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foreach($rows as $k=>$v)
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{
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/*
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如果它是一个顶级栏目，则为它重置深度
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*/
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if(empty($v[$tidField]))
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{
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$stack = array();
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}else{
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if(count($stack) > 1)
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{
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/*
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在这个循环中必须追溯直至与其平级的分类
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while循环无法重写条件中已经改变的变量
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第一次max(array_keys($stack))赋值为当前深度
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循环中的第一个if里max(array_keys($stack))是重新统计，而非使用一定义的
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因为第二次循环到此时可能max(array_keys($stack))已经发生改变
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第三处max(array_keys($stack))表示第一个if中没有break掉的深度值，所以也不能使用赋过值的变量代替。
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加入brake 可使程序追溯至平级栏目即进行下一步操作
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必须是倒序循环，多个平级栏目时，如果是正序列循环会到第一个平级的栏目后停止循环
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*/
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for($i=max(array_keys($stack));$i>=0;$i--)
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if($v[$right]>$stack[max(array_keys($stack))])
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{
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if(count($stack)<1)
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{
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break;
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}
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if($v[$right]>$stack[max(array_keys($stack))])
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{
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array_pop($stack);
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}else{
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break;
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}
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}//end if
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}//end if
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}
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//放入输出数组
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$rows[$k][$this->DeepTitle] = count($stack);
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//将此节点加入栈中
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$stack[] = $v[$right];
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}// end foreach
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return $rows;
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}
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/**
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* Insert() 插入一个栏目
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* 返回数组 left=>左值 right=>右值
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*
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*
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* @param int $tid
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*
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* @return array
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*/
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function Insert($tid){
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$left = $this->fld_left;
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$right = $this->fld_right;
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$categoryTable = $this->CategoryTable;
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//分别处理有上级栏目和没上级栏目的
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if(!empty($tid))
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{
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$sql = "SELECT $right
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FROM $categoryTable
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WHERE id=$tid";
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$sth = $this->db->query($sql);
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$row = $sth->fetch();
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$right_start = $row[$right]-1;
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//更新所有右值
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$sql = "UPDATE $categoryTable SET $right=$right+2 WHERE $right>$right_start";
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$this->db->exec($sql);
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//更新所有左值
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$sql = "UPDATE $categoryTable SET $left=$left+2 WHERE $left>$right_start";
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$this->db->exec($sql);
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//返回应该插入的左右值
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$lft = $right_start + 1;
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$rgt = $lft + 1;
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return array(
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'left'=>$lft,
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'right'=>$rgt
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);
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}else{
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//取最大的右值
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$sql = "SELECT $right
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FROM $categoryTable
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WHERE tid=0
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ORDER BY $left DESC LIMIT 1";
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$sth = $this->db->query($sql);
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$row = $sth->fetch();
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$right_start = $row[$right]-1;
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if($right_start<1)
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{
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return array(
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'left'=>1,
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'right'=>2
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);
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}
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$lft = $right_start + 2;
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$rgt = $lft + 1;
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return array(
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'left'=>$lft,
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'right'=>$rgt
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);
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}
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}//Insert
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//获取栏目路径
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function GetRouter($lft,$rgt){
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$sql = "SELECT * FROM ".$this->CategoryTable."
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WHERE ".$this->fld_left." < $lft AND ".$this->fld_right." > $rgt
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ORDER BY ".$this->fld_left." ASC;";
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$sth = $this->db->query($sql);
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$rows = $sth->fetchAll();
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return $rows;
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}
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function GetSunCount($left,$right){
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return ($right-$left-1)/2;
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}
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//获取一个栏目
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function GetOne($tid){
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$sql = "SELECT * FROM ".$this->CategoryTable." WHERE id=$tid";
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$sth = $this->db->query($sql);
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return $sth->fetch();
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}//GetOne
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} |