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The class java.sql.Date descends from the java.util.Date class but uses only the year, month, and day values. The JDK defines java.sql.Date as follows: public class java.sql.Date extends java.util.Date Also, the JDK says this about java.sql.Date: A thin wrapper around a millisecond value that allows JDBC to identify this as an SQL DATE value. A milliseconds value represents the number of milliseconds that have passed since January 1, 1970 00:00:00.000 GMT. To conform with the definition of SQL DATE, the millisecond values wrapped by a java.sql.Date instance must be normalized by setting the hours, minutes, seconds, and milliseconds to zero in the particular time zone with which the instance is associated. You have several ways to create a java.sql.Date object.

Sometimes, for a given problem, there are different solutions based on the database vendor For example, the code that gets the table names for an Oracle database is different from the code that gets the tables names for a MySQL database When you develop an application or framework for a relational database, be sure that your connection pool manager takes the vendor name as a parameter Depending on the vendor name, you might be calling different methods, or you might be issuing a different set of SQL queries For example, when you re using the BLOB data type, the vendor name makes a difference in reading or writing BLOB data For instance, Oracle requires an empty_blob() function use for setting empty BLOBs, but MySQL does not (empty BLOBs are denoted by NULL in MySQL) The vendor name also plays an important role in connection pool management and database metadata.

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For this solution, we will make use of the same HTML and style sheet file (style.css) that we used in the Recipe 7-1. The jQuery code to apply style properties defined in the style rule .hover to the alternate columns of the table is shown here: $(document).ready(function() { $('td:nth-child(odd)').addClass('hover'); });

This is how you create a java.sql.Date object using java.util.Date: public static java.sql.Date getJavaSqlDate() { java.util.Date today = new java.util.Date(); return new java.sql.Date(today.getTime()); }

The following is according to the JDK: The Calendar class is an abstract class that provides methods for converting between a specific instant in time and a set of calendar fields such as YEAR, MONTH, DAY_OF_MONTH, HOUR, and so on, and for manipulating the calendar fields, such as getting the date of the next week. An instant in time can be represented by a millisecond value that is an offset from the epoch, January 1, 1970, 00:00:00.000 GMT (Gregorian). Using the Calendar object, you can set the year, month, and day portions to the desired values. But you must set the hour, minute, second, and millisecond values to zero. At that point, Calendar. getTime().getTime() is invoked to get the java.util.Date in milliseconds. That value is then passed to a java.sql.Date constructor. // get a calendar using the default time zone and locale. Calendar calendar = Calendar.getInstance(); // set Date portion to January 1, 1970 calendar.set(Calendar.YEAR, 1970 ); calendar.set(Calendar.MONTH, Calendar.JANUARY ); calendar.set(Calendar.DATE, 1 ); // normalize the object calendar.set(Calendar.HOUR_OF_DAY, 0 ); calendar.set(Calendar.MINUTE, 0 ); calendar.set(Calendar.SECOND, 0 ); calendar.set(Calendar.MILLISECOND, 0 ); java.sql.Date javaSqlDate = new java.sql.Date( calendar.getTime().getTime() );

Since we use the :nth-child() method in the jQuery code, let s take a quick look at what it does and how you can use it.

Sun Microsystems maintains a searchable database of JDBC drivers at http://industry.java. sun.com/products/jdbc/drivers. Figure 2-1 shows this database s Web interface.

Suppose you have a pool of connections that you use in a production environment If for some reason the database server goes down, then all of the connections in the pool will be obsolete or defunct that is, they become dead connections Using a dead connection will throw an exception One of the important tasks a pool manager must do is that, before handing a connection to the client, it must make sure that the connection is valid For this reason, a pool manager must issue a minimal SQL query against that database to make sure that the connection is valid If it is valid, then it can be given to a client; otherwise, you need to obtain another available connection or throw an exception This minimal SQL query is called a validity check statement, which can differ from vendor to vendor.

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