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The javasqlResultSet object is assigned the results received from the DBMS after the query is processed The javasqlResultSet object consists of methods used to interact with data that is returned by the DBMS to the J2ME application Later in this chapter you ll learn the details of using the javasqlResultSet object However, the following code is an abbreviated example that gives you a preview of a commonly used routine for extracting data returned by the DBMS Error-catching code is purposely removed from this example in order to minimize code clutter You ll find the completed version of this routine later in this chapter and throughout 11 Assume for Listing 10-3 that a J2ME application requested a customer s first name and last name from a table The result returned by the DBMS is already assigned to the ResultSet object called Results The first time that the next() method of the ResultSet is called, the ResultSet pointer is positioned at the first row in the ResultSet and returns a boolean value If false, this indicates that no rows are present in the ResultSet The if statement in Listing 10-3 traps this condition and displays the End of data message on the screen A true value returned by the next() method means at least one row of data is present in the ResultSet, which causes the code to enter the do while loop The getString() method of the ResultSet object is used to copy the value of a specified column in the current row of the ResultSet to a String object The getString() method is passed the name of the column in the ResultSet whose content needs to be copied, and the getString() method returns the value from the specified column vb.net ean 13 reader .NET EAN - 13 Barcode Reader for C#, VB . NET , ASP.NET Applications
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