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* This class was written for these purposes but can also be used as a * general-purpose GUID generator as well * * RandomGUID generates truly random GUIDs by using the system's * IP address (name/IP), system time in milliseconds (as an integer), * and a very large random number joined together in a single String * that is passed through an MD5 hash The IP address and system time * make the MD5 seed globally unique, and the random number guarantees * that the generated GUIDs will have no discernable pattern and * cannot be guessed given any number of previously generated GUIDs * It is generally not possible to access the seed information (IP, time, * random number) from the resulting GUIDs, as the MD5 hash algorithm * provides one-way encryption.

make the border of the images invisible; the margin property set to 10px will create the spacing of 10px between icons; the width and height properties are set to 60px to reduce the width and height of the images to make them appear as icons Looking now at the jQuery code itself, we first we attach the hover event to all the anchor elements enclosed in the div element of the class small Then in the hover event, the value of the href attribute of the anchor element being hovered over is retrieved and stored in the variable imgname; that is, the respective image file name (whether it is a1jpg, a2jpg, etc) of the icon (on which the mouse pointer is hovering) will be stored in the imgname variable.

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ResultSetMetaData: Gets information about the types and properties of the columns in a ResultSet object This interface is discussed in 4 javasqlParameterMetaData: Gets information about the types and properties of the parameters in a PreparedStatement object ParameterMetaData, introduced in JDBC 30, retrieves information such as the number of parameters in the PreparedStatement, the type of data that can be assigned to the parameter, and whether or not the parameter value can be set to null This interface is discussed in 5 javaxsqlRowSetMetaData: Extends the ResultSetMetaData, an object that contains information about the columns in a RowSet object This interface is an extension of the ResultSetMetaData interface and has methods for setting the values in a RowSetMetaData object When a RowSetReader object reads data into a RowSet object, it creates a RowSetMetaData object and initializes it using the methods in the RowSetMetaData interface.

* * ----> Security of RandomGUID: <----* RandomGUID can be called one of two ways -- with the basic java Random * number generator or a cryptographically strong random generator * (SecureRandom) The choice is offered because the secure random * generator takes about 35 times longer to generate its random numbers, * and this performance hit may not be worth the added security * especially considering the basic generator is seeded with a * cryptographically strong random seed..

Connection objects available at any given time will vary. A database client can check out a Connection object, use it, and then return it to the pool manager so some other client can use it. Sometimes, the connection pool will run dry (which means all Connection objects are checked out by clients); if no Connection objects are in the pool when a client makes a request, the client will have to wait until one is checked back in. This sharing of Connection objects has at least two benefits: Limited connections: The number of connections allowed to a particular database may be limited because of server capacity or database licensing restrictions. Hence, you need to limit the number of connections created. (You can best handle this with a pool of connections and pool manager infrastructure.) Performance: Database connections are costly in terms of the amount (two to three seconds) of time needed for connecting and disconnecting to the database. Reusing and managing the connections (by the pool manager), rather than discarding and re-creating them every time one is needed, means that each Connection object will be connected to the database for its entire lifetime. (If a connection goes bad because of a network problem, for example then the pool manager will have to replace bad/defected/stalled connections with new good Connection objects.) This reuse of Connection objects results in a drastic increase in performance, as the connection is already live when the client acquires it.

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