php从数据库查询结果生成树形列表的方法
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2020-12-18
05:39:33
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php从数据库查询结果生成树形列表的方法从数据库查询结果生成树形列表的方法
本文实例讲述了php从数据库查询结果生成树形列表的方法。分享给大家供大家参考。具体分析如下：
本代码可以从数据库读取数据生成一个类似于windows的资源管理器的树形列表
<?php
/* Here are the database definitions (for Solid) that i use in this code.
* It should not be hard to adapt it to another database.
*/
/*
CREATE TABLE dirent_types (
id INTEGER NOT NULL,
icon VARCHAR(50),
name VARCHAR(50),
PRIMARY KEY(id)
);
INSERT INTO dirent_types VALUES(1, 'folderclosed', 'Directory');
INSERT INTO dirent_types VALUES(2, 'document', 'File');
CREATE TABLE directory (
id INTEGER NOT NULL,
parent INTEGER REFERENCES directory(id),
name VARCHAR(200),
icon VARCHAR(50),
type INTEGER REFERENCES dirent_types(id),
url VARCHAR(200),
PRIMARY KEY(id)
);
DROP INDEX directory_idx;
CREATE UNIQUE INDEX directory_idx ON directory(parent, name);
CREATE SEQUENCE dirent_id;
"CREATE PROCEDURE insert_dir_entry
(name VARCHAR, parent INTEGER, type INTEGER)
RETURNS(id INTEGER)
BEGIN
EXEC SQL WHENEVER SQLERROR ABORT;
EXEC SEQUENCE dirent_id.NEXT INTO id;
EXEC SQL PREPARE c_insert
INSERT INTO directory
(id, parent, type, name)
VALUES(?, ?, ?, ?);
EXEC SQL EXECUTE c_insert USING (id, parent, type, name);
EXEC SQL DROP c_insert;
END";
CALL insert_dir_entry('My Computer', NULL, 1);
CALL insert_dir_entry('Network Neighbourhood', NULL, 1);
CALL insert_dir_entry('lucifer.guardian.no', 2, 1);
CALL insert_dir_entry('rafael.guardian.no', 2, 1);
CALL insert_dir_entry('uriel.guardian.no', 2, 1);
CALL insert_dir_entry('Control Panel', NULL, 1);
CALL insert_dir_entry('Services', 6, 1);
CALL insert_dir_entry('Apache', 7, 2);
CALL insert_dir_entry('Solid Server 2.2', 7, 2);
*/
function icon($icon, $name = '', $width = 0, $height = 0) {
global $DOCUMENT_ROOT;
$icon_loc = '/pics/menu';
$file = "$DOCUMENT_ROOT$icon_loc/$icon.gif";
if (!$width || !$height) {
$iconinfo = getimagesize($file);
if (!$width) {
$width = $iconinfo[0];
}
if (!$height) {
$height = $iconinfo[1];
}
}
printf( '<img%s border=0 align=top src="/pics/menu/%s.gif" '.
'width="%d" height="%d">', $name ? " name=\"$name\"" : '',
$icon, $width, $height);
}
function display_directory($parent,$showdepth=0,$ancestors=false){
global $child_nodes, $node_data, $last_child;
reset($child_nodes[$parent]);
$size = sizeof($child_nodes[$parent]);
$lastindex = $size - 1;
if (!$ancestors) {
$ancestors = array();
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