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ConnectionPoolDataSource and javaxsql PooledConnection if your driver implements these interfaces Use custom connection pools: You can create your own connection pool if you are not using any application server or JDBC 20 compatible driver In general, this is error-prone; you need to test your solution before releasing it to the production environment..

The sort() method, as noted earlier, sorts the elements on the basis of ASCII values, so it cannot be used with numerical values, as it will consider 10 smaller than 3 (as the ASCII value of 1 is smaller than that of 3). If we try sort() with the numerical array, the jQuery code would be as shown here: $(document).ready(function() { var members = [45, 10, 3, 22, 7]; $('p.a').html(members.join("<br/>")); members = members.sort(); $('p.b').html(members.join("<br/>")); }); We would then get output like that shown in Figure 2-14.

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In database terminology, a transaction represents one atomic unit of work or a bunch of code in the program that executes in its entirety or not at all. To be precise, it is all or no work. In JDBC, a transaction is a set of one or more Statement objects that execute as a single unit. The java.sql.Connection interface provides the following methods to control a transaction in JDBC: boolean getAutoCommit(); void setAutoCommit(boolean autoCommit); void commit(); void rollback();

Java servlets take this concept further by extending it into the field of server-side scripting Servlets are small Java classes that run in a server application (hence the name servlets, similar to applets on the client side) to answer client requests Servlets are not tied to a specific client-server protocol, but they are most commonly used with HTTP and the word servlet is often used in the meaning of HTTP servlet Servlets make use of the Java classes in these packages: javaxservlet: The basic Servlet framework javaxservlet.

In JDBC, by default, the autocommit mode is true. This means a transaction starts and commits after each statement s execution on a connection. If a connection is in autocommit mode, then all its SQL statements will be executed and committed as individual transactions. (In this case, you do not need to write a commit() method explicitly after each statement.) When the autocommit mode is true, your database application gives poor performance (since beginning and ending/committing a transaction will cost some time). Therefore, to improve the performance of your application, it is better to group logically related JDBC statements and then execute all of them under the umbrella of a transaction. This batch transaction gives good performance by reducing commit calls after each statement s execution. The batch transaction approach is as follows: Connection conn = null; Statement stmt = null; PreparedStatement pstmt = null; PreparedStatement pstmt2 = null; try{ conn = getConnection(); // start transaction explicitly conn.setAutoCommit(false); String updateBookTable = "update books_table set author= where isbn= "; pstmt = conn.prepareStatement(updateBookTable); pstmt.setString(1, "Don Knuth"); pstmt.setString(2, "1234567890"); pstmt.executeUpdate(); String createBook = "insert into books_table(author, isbn) values( , )"; pstmt2 = conn.prepareStatement(createBook); pstmt2.setString(1, "Mahmoud Parsian"); pstmt2.setString(2, "1122334455"); pstmt2.executeUpdate(); // // end transaction explicitly // conn.commit(); } catch(SQLException e){ // handle the exception // undo all of the operations connection.rollback(); } finally{ // close the JDBC resources DatabaseUtil.close(pstmt); DatabaseUtil.close(pstmt2); DatabaseUtil.close(conn); }

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