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In the event-handling function, we see that the data in the text-input field (the text field is enclosed in the span element of class infobox) is retrieved and is stored in a variable called data Its length is calculated and a for loop is executed up till the length of the input data to parse each of its individual characters In the for loop, we take one character at a time (of the input data), and with the help of charCodeAt(), find its ASCII value If the ASCII value of the character is below the numeral 0 (ASCII value of 48) or more than the numeral 9 (ASCII value of 57), meaning it is not a numerical value, then we make the error message visible on the screen and exit from the loop.

int delRight = rs.getInt(3); System.out.println("ID="+ID); System.out.println("parentID="+parentID); System.out.println("delLeft="+delLeft); System.out.println("delRight="+delRight); if(promoteSubtree) { // promote the subtree promoteTheSubTree(conn, ID, parentID, delLeft, delRight); } else { // promote the leftmost sibling to the new parent promoteSibling(conn, ID, parentID, delLeft, delRight); }

15 close empCursor; 16 commit; 17 end raiseAge; 18 / Procedure created. SQL> describe raiseAge; PROCEDURE raiseAge Argument Name Type ------------------------------ ----------------------ID_PARAM NUMBER INCREMENT_PARAM NUMBER SQL> select * from employees where id =11; ID NAME AGE ---------- -------------------- ---------11 Alex Smith 25 SQL> execute raiseAge(11, 3); PL/SQL procedure successfully completed. SQL> select * from employees where id =11; ID NAME AGE ---------- -------------------- ---------11 Alex Smith 28 SQL> commit; SQL> select * from employees where id =44; ID NAME AGE ---------- -------------------- ---------44 Monica Seles 30 SQL> execute raiseAge(44, 7); PL/SQL procedure successfully completed. SQL> select * from employees where id =44; ID NAME AGE ---------- -------------------- ---------44 Monica Seles 37

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System.out.println("------DeleteNode end---------"); } catch (Exception e) { e.printStackTrace(); System.exit(1); } finally { // release database resources } }

The preventDefault() method of the event object is used to prevent the data entered by the user from being sent to the server or the user navigating to the target form On execution of the program, if we enter some characters after the age, we get the error message Only numerals allowed , as shown in Figure 4-3..

public static void promoteTheSubTree(Connection conn, String ID, String parentID, int delLeft, int delRight) throws SQLException, BatchUpdateException { // start transaction for batch updates conn.setAutoCommit(false); Statement stmt = conn.createStatement(); String deleteID = "delete from folders where ID = '"+ID+"'"; String update1 = "update folders set lft = lft - 1, "+ "rgt = rgt - 1 where lft between "+delLeft+" and "+delRight; String update2 = "update folders set rgt = rgt - 2 "+ "where rgt > "+delRight; String update3 = "update folders set lft = lft - 2 "+ "where lft > "+delRight; String update4 = "update folders set parent = '"+parentID+ "' where parent='"+ID+"'"; stmt.addBatch(deleteID); stmt.addBatch(update1); stmt.addBatch(update2); stmt.addBatch(update3); stmt.addBatch(update4); // send batch operations to the database server int[] batchUpdateCounts = stmt.executeBatch();

$ mysql -u root -proot Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 4 to server version: 5.0.12-beta-nt mysql> use octopus; Database changed mysql> delimiter // mysql> CREATE PROCEDURE simpleproc (OUT param1 INT) -> BEGIN -> SELECT COUNT(*) INTO param1 FROM employees; -> END -> //

JDBC can use four types of drivers to connect to databases. The type 1 driver translates its calls into ODBC calls (see Figure 1-11). ODBC then interacts with the desired database. It is the most available but slowest type, and it works only on Microsoft Windows and Sun Solaris. There is only one driver in existence, sun.jdbc.odbc.JdbcOdbcDriver. You may use this driver to access the Microsoft Access personal database.

Figure 4-3. Error message displayed if a character appears after the age Even if the character appears in between the digits, the error will be displayed, as shown in Figure 4-4.

The type 2 driver translates its calls to the native (C, C++, Pascal, and so on) API calls of the desired database, which then call the desired database (see Figure 1-12). For example, Oracle Call Interface (OCI) calls are used in developing Oracle s type 2 drivers. (The Oracle OCI is a set of low-

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