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You can prepare the database in such a way to map trees into SQL using nested sets. Using nested sets, you need the following database schema and elements. Note that the root node s parent (that is, Albert s parent) is null. $ mysql --user=root --password=root --default-character-set=utf8 mysql> use snipit; Database changed mysql> drop table folders; mysql> create table folders ( -> id varchar(10), -> parent varchar(10), -> lft int, -- left_pointer -> rgt int -- right_pointer -> ); mysql> mysql> mysql> mysql> mysql> mysql> insert insert insert insert insert insert into into into into into into folders(id, folders(id, folders(id, folders(id, folders(id, folders(id, parent, parent, parent, parent, parent, parent, lft, lft, lft, lft, lft, lft, rgt) rgt) rgt) rgt) rgt) rgt) values('Albert', null, 1, 12); values('Bert', 'Albert', 2, 3); values('Chuck', 'Albert', 4, 11); values('Donna', 'Chuck', 5, 6); values('Eddie', 'Chuck', 7, 8); values('Fred', 'Chuck', 9, 10);

/** * Append attribute=value to the string buffer denoted by sb. * @param sb the string buffer. * @param attribute the attribute name. * @param value the value of the attribute. */ private static void append(StringBuffer sb, String attribute, int value) { sb.append(attribute); sb.append("=\""); sb.append(value); sb.append("\" "); } /** * Append attribute=value to the string buffer denoted by sb. * @param sb the string buffer. * @param attribute the attribute name. * @param value the value of the attribute. */ private static void append(StringBuffer sb, String attribute, boolean value) { sb.append(attribute); sb.append("=\""); sb.append(value); sb.append("\" "); }

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mysql> desc folders; +--------+-------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +--------+-------------+------+-----+---------+-------+ | id | varchar(10) | YES | | NULL | | | parent | varchar(10) | YES | | NULL | | | lft | int(11) | YES | | NULL | | | rgt | int(11) | YES | | NULL | | +--------+-------------+------+-----+---------+-------+ 4 rows in set (0.00 sec) mysql> select * from folders; +--------+--------+------+------+ | id | parent | lft | rgt | +--------+--------+------+------+ | Albert | NULL | 1 | 12 | | Bert | Albert | 2 | 3 | | Chuck | Albert | 4 | 11 | | Donna | Chuck | 5 | 6 | | Eddie | Chuck | 7 | 8 | | Fred | Chuck | 9 | 10 | +--------+--------+------+------+ 6 rows in set (0.00 sec)

If we select the Submit button without entering anything in the text field, we will get an error message This field cannot be blank displayed in red beside the text field, as shown in Figure 4-1..

Inserting a New Node (InsertNode.java)

The client using Oracle database will use the employees table described here: $ sqlplus octopus/octopus SQL*Plus: Release 9.2.0.1.0 - Production on Tue Feb 25 08:13:46 2003 Connected to: Oracle9i Enterprise Edition Release 9.2.0.1.0 - Production SQL> describe employees; Name Null Type ----------------- -------- ---------------BADGENUMBER NOT NULL NUMBER(38) NAME VARCHAR2(60) EMPLOYEETYPE VARCHAR2(30) PHOTO BINARY FILE LOB

The objective of the InsertNode class is to insert a new node for an existing tree (identified by the folders table). To insert a new node, you need to supply the parent. Therefore, you need two pieces of information for inserting a new node: the node to be inserted and the parent (where it s to be inserted). So, the InsertNode class s main() method will accept two arguments: the parentID and ID, where ID is the new node to be inserted and parentID is the ID of the parent for the new node.

Figure 4-1. Error message displayed when the text-input field is left blank If we enter some name in the text field and select the Submit button, we will not get any error message, as indicated here:

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