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CHAPTER 11 EXPLORING THE STATEMENT
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95 96 97 98 99 100 101 102 103 104 105 106 107 108
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catch (Exception e) { // other exceptions e.printStackTrace(); System.exit(1); } finally { // release database resources DatabaseUtil.close(rs); DatabaseUtil.close(pstmt); DatabaseUtil.close(stmt); DatabaseUtil.close(conn); } } }
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Discussing InsertNode.java
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The following explains how the program works: Lines 1 9: You import the required classes and interfaces. Lines 11 19: The getConnection() method returns a java.sql.Connection object. Lines 38 42: These lines get the command-line arguments parentID and ID (which is the node ID to be inserted). Lines 44 50: Here, you retrieve the left and right of the parentID. These values will be used for further processing. Lines 54 57: These lines prepare SQL queries for batch updates. Line 60: This lines starts the transaction for batch updates. No SQL operation will be committed until you invoke the conn.commit() statement. Line 61: Creates a generic Statement object to be used for batch updates. Lines 64 67: Create a set of batch operations. The order of these batch operations is important, and the batch works as a queue (first-in, first-out). Line 69: Sends batch operations to the database server (operations are not committed yet!). Line 73: Commits transaction for batch updates (either all succeed or all fail no partial success). Lines 100 106: Release database resources (to free up memory and data structures used by the JDBC driver and database server).
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Deleting an Existing Node (DeleteNode.java)
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The objective of the DeleteNode class is to delete an existing node from a tree (identified by the folders table). To delete an existing node, you need to supply the ID of the node being deleted. Also, you need to indicate whether to promote the subtree of the deleted node; you pass this argument as a boolean (true/false). So, the DeleteNode class s main() method will accept two arguments: the ID of the node to be deleted and a boolean (true/false) to indicate the promotion of the subtree of the deleted node. If a node is a leaf node, it is easy to delete it, because it has no impact on other nodes. But if a node to be deleted is an inner node (a nonleaf node, which has at least one child), then the deletion process is complex. When a node is deleted from the tree, you have to preserve the integrity of the tree if the node has any subnodes. You have two approaches:
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CHAPTER 11 EXPLORING THE STATEMENT
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The first approach is to promote one of the deleted node s children (a subnode) to take over the position of the deleted node. The remaining subnodes of the deleted node become subnodes to the promoted node. To understand this, take a look at the following figures: assume that the original tree is Figure 11-2, and you want to delete node B. Using the promotion approach, the resultant tree will become Figure 11-3. The second approach is to promote the entire subtree (all the children) of the deleted node so that all the subnodes of the deleted node become the subnodes of the deleted node s parent node. Assume that the original tree is Tree-1, and you want to delete node B. Using the promotion of the entire subtree approach, the resultant tree will become Figure 11-4.
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Figure 11-2. Mapping tree to relational model: original tree
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Figure 11-3. Deleting node B by promoting one of the deleted node s children
CHAPTER 11 EXPLORING THE STATEMENT
Figure 11-4. Deleting node B by promoting the entire subtree
Viewing the Tree Structure Before the Deletion
This is the tree structure before the deletion: mysql> select * from folders; +--------+--------+------+------+ | id | parent | lft | rgt | +--------+--------+------+------+ | Albert | NULL | 1 | 18 | | Bert | Albert | 4 | 9 | | Chuck | Albert | 10 | 17 | | Donna | Chuck | 11 | 12 | | Eddie | Chuck | 13 | 14 | | Fred | Chuck | 15 | 16 | | Mike | Bert | 7 | 8 | | Mary | Bert | 5 | 6 | | Jeff | Albert | 2 | 3 | +--------+--------+------+------+ To delete Jeff (under Albert), use this code: $ java DeleteNode Jeff false ------DeleteNode begin--------conn=com.mysql.jdbc.Connection@750159 ID=Jeff promoteSubtreeAsString=false ------DeleteNode end--------mysql> select * from folders; +--------+--------+------+------+ | id | parent | lft | rgt | +--------+--------+------+------+ | Albert | NULL | 1 | 16 | | Bert | Albert | 2 | 7 | | Chuck | Albert | 8 | 15 | | Donna | Chuck | 9 | 10 | | Eddie | Chuck | 11 | 12 | | Fred | Chuck | 13 | 14 | | Mike | Bert | 5 | 6 | | Mary | Bert | 3 | 4 | +--------+--------+------+------+ 8 rows in set (0.01 sec) To delete Chuck (under Albert), use this code: $ java DeleteNode Chuck true
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