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CHAPTER 11 EXPLORING THE STATEMENT
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A value of SUCCESS_NO_INFO: Indicates that the command was processed successfully but that the number of rows affected is unknown. If one of the commands in a batch update fails to execute properly, this method throws a BatchUpdateException, and a JDBC driver may or may not continue to process the remaining commands in the batch. However, the driver s behavior must be consistent with a particular DBMS, either always continuing to process commands or never continuing to process commands. If the driver continues processing after a failure, the array returned by the method BatchUpdateException.getUpdateCounts will contain as many elements as there are commands in the batch, and at least one of the elements will be a value of EXECUTE_ FAILED, which indicates that the command failed to execute successfully and occurs only if a driver continues to process commands after a command fails. A driver is not required to implement this method. The possible implementations and return values have been modified in version 1.3 of the Java 2 SDK, Standard Edition, to accommodate the option of continuing to process commands in a batch update after a BatchUpdateException object has been thrown. Statement.executeBatch() returns an array of update counts containing one element for each command in the batch. The elements of the array are ordered according to the order in which commands were added to the batch. This throws SQLException if a database access error occurs or the driver does not support batch statements. This throws BatchUpdateException (a subclass of SQLException) if one of the commands sent to the database fails to execute properly or attempts to return a result set.
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11-27. How Do You Map Trees into SQL Using Batch Updates
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Mapping trees to a relational model is a common problem, with many solutions. Joe Celko has discussed trees in SQL extensively (for details, refer to http://www.intelligententerprise.com/001020/celko. jhtml). Two major approaches exist: the adjacency list model and the modified preorder tree traversal algorithm. Just like Joe Celko, I will show a preorder tree traversal algorithm (also known as a nested set). Here I will focus on three specific tree operations: Inserting a new node (InsertNode.java) Deleting an existing node (DeleteNode.java) Deleting an existing subtree (DeleteSubtree.java) Suppose you want to map the tree shown in Figure 11-1 to a relational model. (For a moment, ignore the numbers next to the names; you will use these numbers to define and implement the tree using nested sets later in this chapter.)
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CHAPTER 11 EXPLORING THE STATEMENT
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Setting Up the Database
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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);
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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)
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Inserting a New Node (InsertNode.java)
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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.
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