pdf417 java library Builds an object from a row of data in Java

Maker PDF 417 in Java Builds an object from a row of data

Builds an object from a row of data
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Returns the previous page
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int count = page; //try to return a full page
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Object[] rvalue = null; try { if( ( firstRowNumber - count ) < 0 ) { count = count - firstRowNumber; } if( count <= 0 ) return null; //decrement the current page index current--; //test to see if we should be at the beginning if( ( firstRowNumber - count) == 0 ) set.absolute( firstRowNumber - count + 1 ); else set.absolute( firstRowNumber - count ); rvalue = new Object[ count ]; for( int i = 0; i < count; i++ ) { rvalue[ i ] = buildObject( set.next() ); } firstRowNumber = set.getRow() - count; } catch( Exception e ) { e.printStackTrace(); } return rvalue; } public int getTotalPages() { try { int mod = total % page; int result = total/page; if( mod != 0 ) return result + 1 + ""; else return result + ""; } catch( Exception e ) { e.printStackTrace(); }
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Returns the total number of pages
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Working with data
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return 1; } public void cleanup() Cleans up the statement { and connection try{ if( stmt != null ){ stmt.close(); stmt = null; } if( con != null && !con.isClosed()) { con.close(); } }catch( Exception ex ) { ex.printStackTrace(); } } public boolean canNext() Tests to see if next() { will return a value try{ return !(set.isAfterLast()); } catch( Exception e ){e.printStackTrace();} return false; } public boolean canPrevious() { try{ if( firstRowNumber <= 1 ) return false; }catch( Exception e ){ e.printStackTrace(); return false; } return true;; } private ResultSet executeQuery( String sql ) throws Exception { con = null; stmt= null; ResultSet rs = null; con = getConnection(); stmt = con.createStatement(|#10 ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_UPDATABLE); |#10 rs = stmt.executeQuery( sql ); rs.next(); return rs; }
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Tests to see if previous() will return a value
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Creates a scrollable result set
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private Connection getConnection() { //implementation not shown } private Object buildObject() { //implementation not shown } }
Discussion
While the code in the solution is lengthy, it is pretty straightforward. There are a couple of key points to make about this session bean. First, in order to predict the number of data pages, the session bean requires you to pass in an SQL statement that returns the row count of the query that will be paginated. Second, the result set created by executing the query must be scrollable. This is done by creating the Statement object with the following line of code:
stmt = con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_UPDATABLE);
Once the actual result set is acquired, the next() and previous() methods just keep track of the database cursor as they scroll through the result set. The only tricky part is being careful with the beginning and end indexes of the result set. Both methods use the total number of rows, the page size constant, and the return value of the getRow() method to determine how much data to return. The getRow() method of the ResultSet object returns the index number of the current row selected. Using a page-able mechanism like this one allows your clients to build pageable tables in their displays. Users can then navigate forward and backward through the result set as needed. Another convenience method you could easily add to this bean is a jump() method. A jump method could loop through successive calls of next() or previous() to reach a certain page of data. Since the bean knows the total number of pages, this would be a simple exercise.
EJB activities
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EJB activities
EJBs are hard workers that can perform many activities. In addition to working with data (covered in chapter 3), EJBs can be used to retrieve environment vari-
ables, access the file system, send email, and more. This chapter also covers two important improvements added to EJBs with the 2.1 specification: the EJB timer service, and the use of EJBs as web service endpoints. You will find the following topics in this chapter:
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