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Figure 2-14. Numerical arrays not sorted correctly As you can see here, the numerical values are not sorted correctly with the sort() method because it considers the ASCII value of the first numerical digit of all numerical values for sorting purposes. To sort numerical values correctly, we must therefore define a comparison function with sort(). If we define a comparison function, then a pair of values from the array will be repeatedly sent to the function until all elements of the array are processed. In the comparison function, we thus write a statement considering the pair of values passed to it so that the function returns any of the following three values: <0, =0, or >0. When the function returns value <0, the second value (of the pair of array values sent to the function) is larger than the first value and hence must be pushed down the sorting order. When the function returns value >0, the first value is larger than the second value, so it must be pushed down the sorting order. When the function returns value =0, it means there is no need to change the sort order since the two values are same.

According to http://www.javaperformancetuning.com/tips/jdbctransaction.shtml, you should do the following:

http: Extensions of the servlet framework for servlets that answer HTTP requests Typical uses for HTTP servlets include Processing and/or storing data submitted by an HTML form Providing dynamic content, for example, returning the results of a database query to the client (as HTML, XML) Managing state information on top of the stateless HTTP for example, for an online , shopping cart system that manages shopping carts for many concurrent customers and maps every request to the right customer A Java servlet engine is the Java application that executes the Java servlet It is a mechanism by which a Java application can be written to provide dynamic web content For example, Tomcat.

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If you are not using stored procedures or triggers, turn off autocommit. All transaction levels operate faster with autocommit turned off, and doing this means you must code commits. Coding commits while leaving auto-commit on will result in extra commits being done for every db operation. Use the appropriate transaction level. Increasing performance costs for transaction levels are TRANSACTION_NONE, TRANSACTION_READ_UNCOMMITTED, TRANSACTION_READ_COMMITTED, TRANSACTION_REPEATABLE_READ, TRANSACTION_ SERIALIZABLE. Note that TRANSACTION_NONE, with autocommit set to true gives access to triggers, stored procedures, and large object columns. Data accessibility is controlled through the transaction isolation level mechanism. Transaction isolation level determines the degree to which multiple interleaved transactions are prevented from interfering with each other in a multiuser database system. How do you achieve transaction isolation You achieve it by locking mechanisms that guide the reading and writing of transaction data. The java.sql.Connection interface provides methods and constants to set and get transaction isolation levels. For example: public interface Connection { public static final int TRANSACTION_NONE = 0 public static final int TRANSACTION_READ_COMMITTED = 2 public static final int TRANSACTION_READ_UNCOMMITTED = 1 public static final int TRANSACTION_REPEATABLE_READ = 4 public static final int TRANSACTION_SERIALIZABLE = 8 int getTransactionIsolation(); void setTransactionIsolation(int transactionIsolationLevel); } You can set the transaction isolation level with the setTransactionIsolation() method by passing the previous constants (TRANSACTION_XXX) to this method. You can also get the existing transaction isolation level with the getTransactionIsolation() method.

The jQuery code with the comparison function added to the sort() method looks like this: members = members.sort(function(a,b){ return a-b; }); The following statement in the comparison function will sort the numerical values in ascending order: return a-b; We get output much like Figure 2-15.

DatabaseMetaData and ResultSetMetaData have methods that you can use to issue generic search patterns to the database server by passing the null values. Using null arguments or search patterns in database metadata methods results in generating time-consuming queries. (In a production environment, you might cache these metadata values in order to improve the performance.) In addition, network traffic potentially increases because of unwanted results. Always supply as many non-null arguments to result sets that generate database metadata methods as possible. Because DatabaseMetaData methods are slow, database applications should invoke them as efficiently as possible. Many applications pass the fewest non-null arguments necessary for the function to return success. The non-efficient method call is as follows: Connection conn = ...; DatabaseMetaData meta = conn.getMetaData(); ResultSet rs = meta.getTables (null, null, "EmpTable", null); The efficient method call is:Connection conn = ...; DatabaseMetaData meta = conn.getMetaData(); String[] tableTypes = { "TABLE" }; ResultSet rs = meta.getTables ("empCatalog", "empSchema", "EmpTable", tableTypes);

(http://jakarta.apache.org/tomcat/) has a servlet engine that you can use to execute Java servlets.

Figure 2-15. Numerical arrays sorted correctly Of course, to sort the values in descending order, we just need to change the return value in the comparison function from a-b to b-a!

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