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Re: Tree structure [message #4707 is a reply to message #4697]

Fri, 24 April 2015 04:07

AJM
Messages: 2347
Registered: April 2006
Location: Surrey, UK

Senior Member

You have to adjust the first query to only select those entries at the top of the tree (ie: with tree_level=1). You are controlling the queries which the code issues, so it is up to you to get those queries right.

For your information I have successfully implemented tree views in my enterprise application using tables which do not include column names such as TREE_TYPE, TREE_LEVEL or TREE_NODE, and which have compound primary keys, so I know that it is definitely possible to do so. My most recent usage was to display a Bill of Materials (BOM) in my PRODUCT database which uses a single table which contains the product hierarchy, as shown below:

CREATE TABLE `product_component` (
`product_id_snr` VARCHAR(40) NOT NULL,
`product_id_jnr` VARCHAR(40) NOT NULL',
`seq_no` SMALLINT(5) UNSIGNED NOT NULL,
`revision_id_snr` VARCHAR(16) NULL DEFAULT NULL,
`revision_id_jnr` VARCHAR(16) NULL DEFAULT NULL,
`quantity` DECIMAL(15,6) UNSIGNED NOT NULL DEFAULT '1.000000',
`start_date` DATE NOT NULL DEFAULT '2000-01-01',
`end_date` DATE NULL DEFAULT '9999-12-31',
PRIMARY KEY (`product_id_snr`, `product_id_jnr`, `seq_no`)
);

Tony Marston
http://www.tonymarston.net
http://www.radicore.org

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[Message index]

		Tree structure By: htManager on Sat, 05 July 2014 06:17
		Re: Tree structure By: AJM on Sun, 06 July 2014 04:40
		Re: Tree structure By: htManager on Mon, 07 July 2014 05:52
		Re: Tree structure By: htManager on Wed, 11 February 2015 11:05
		Re: Tree structure By: AJM on Thu, 12 February 2015 04:34
		Re: Tree structure By: htManager on Thu, 12 February 2015 08:31
		Re: Tree structure By: AJM on Fri, 13 February 2015 05:10
		Re: Tree structure By: htManager on Thu, 26 February 2015 09:12
		Re: Tree structure By: AJM on Sat, 28 February 2015 06:20
		Re: Tree structure By: htManager on Sat, 28 February 2015 08:31
		Re: Tree structure By: AJM on Sun, 01 March 2015 04:23
		Re: Tree structure By: htManager on Mon, 02 March 2015 04:44
		Re: Tree structure By: htManager on Thu, 23 April 2015 11:49
		Re: Tree structure By: AJM on Fri, 24 April 2015 04:07
		Re: Tree structure By: htManager on Mon, 04 May 2015 11:48
		Re: Tree structure By: AJM on Tue, 05 May 2015 04:30
		Re: Tree structure By: htManager on Mon, 01 June 2015 11:32
		Re: Tree structure By: AJM on Tue, 02 June 2015 05:12
		Re: Tree structure By: htManager on Tue, 02 June 2015 10:46
		Re: Tree structure By: AJM on Tue, 02 June 2015 13:05
		Re: Tree structure By: htManager on Mon, 11 January 2021 12:54
		Re: Tree structure By: AJM on Mon, 11 January 2021 13:50
		Re: Tree structure By: htManager on Mon, 11 January 2021 15:47
		Re: Tree structure By: htManager on Wed, 13 January 2021 04:10
		Re: Tree structure By: AJM on Wed, 13 January 2021 05:25
		Re: Tree structure By: htManager on Wed, 13 January 2021 06:13
		Re: Tree structure By: AJM on Thu, 14 January 2021 05:09
		Re: Tree structure By: htManager on Sat, 16 January 2021 03:43
		Re: Tree structure By: AJM on Sat, 16 January 2021 05:06
		Re: Tree structure By: htManager on Sun, 24 January 2021 14:57

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