.NET/Java PDF, Tiff, Barcode SDK Library

JDBCUtil.printException ( e ); } finally { // release the JDBC resources in the finally clause. JDBCUtil.close( conn ); } } // end of main() The method _demoScrollSensitiveResultSet() gets a scroll-sensitive, read-only result set: private static void _demoScrollSensitiveResultSet( Connection conn, String stmtString ) throws SQLException, IOException { ResultSet rset = null; PreparedStatement pstmt = null; try { pstmt = conn.prepareStatement( stmtString, ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet. CONCUR_READ_ONLY); System.out.print( "For statement: " + stmtString + ", " ); rset = (ResultSet) pstmt.executeQuery(); JDBCUtil.printRsetTypeAndConcurrencyType( rset ); After printing the result set type and concurrency type, we set the fetch size to 5. We move to the first row of the result set: rset.setFetchSize(5); System.out.println( "New fetch size: " + rset.getFetchSize() ); rset.first(); // moves to first row Next, we insert a program pause, during which we update the first row from SQL*Plus: System.out.println( "Row number " + rset.getRow() + " has a value = " + rset.getInt( 1 ) ); InputUtil.waitTillUserHitsEnter( "Perform update on first row and " ); We then move to the last row; this will refresh just the last row. We move back to the first row; this will refresh the first five rows. We should see latest values of all these rows. To verify this, we print out the value of x in the first row, since we would have modified it during our pause: rset.last(); // moves to last row changing the window size rset.first(); // moves back to first row changing the window size System.out.println( "Row number " + rset.getRow() + " now has a value = " + rset.getInt( 1 ) ); } finally {

barcode erstellen excel, barcode generator excel 2010 free, free barcode generator software excel, microsoft barcode control excel 2010, free online barcode generator excel, how to create barcode in microsoft excel 2007, barcode generator excel 2010 freeware, how to barcode in excel 2010, how to generate 2d barcode in excel, create barcode in excel vba,

Records support a convenient syntax to clone all the values in the record, creating a new value, with some values replaced. Here is a simple example:

Assume you have authored the following type using C# contained in a file named MyCriticalClass.cs: using System; public class MyCriticalClass { public string GetSensitiveInformation() { return "The magic value is 9"; } } If you were to compile this code file into a .NET code library at the command line using the following command: csc /t:library *.cs you could now view the generated CIL code, type metadata, and manifest information by issuing the following command to the ildasm.exe utility (see Figure 5-1): ildasm MyCriticalClass.dll

// release the JDBC resources in the finally clause. JDBCUtil.close( rset ); JDBCUtil.close( pstmt ); } } } // end of program We assume that t1 contains the numbers 1 to 30 in its column x before running this program. When we run the program, we get the following output: >java DemoScrollSensitiveResultSet URL:jdbc:oracle:thin:@(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(PORT=1521) (HOST=rmenon-lap))(CONNECT_DATA=(SID=ora10g))) For statement: select x from t1 order by x, Result set category (using Resul tSet API): Scroll sensitive, Read only New fetch size: 5 Row number 1 has a value = 1 Perform update on first row and Press Enter to continue... We modify the first row as follows: scott@ORA10G> update t1 set x = 111 where x = 1; 1 row updated. scott@ORA10G> commit; Commit complete. When we press Enter, we should see the latest value as follows: Press Enter to continue... Row number 1 now has a value = 111 In the next section, we will look at the database changes visible to a ResultSet object.

type Point3D = { X: float; Y: float; Z: float } let p1 = { X=3.0; Y=4.0; Z=5.0 } > let p2 = { p1 with Y=0.0; Z=0.0 };; val p2 : Point3D The definition of p2 is identical to this: let p2 = { X=p1.X; Y=0.0; Z=0.0 } This expression form does not mutate the values of a record, even if the fields of the original record are mutable.

The same select should work now: scott@ORA10G> select ora_rowscn from v2; ORA_ROWSCN ---------4920043 4920043 4920046 The ora_rowscn pseudo column is not supported for external tables (we covered external tables briefly in 12). You cannot enable rowdependencies for an existing table; you have to drop and re-create the table, which may not be always feasible. Let s look at an example demonstrating the use of ora_rowscn to implement optimistic locking. The example is similar to the one in the section Optimistic Locking by Using a Checksum of Modified Column Values, but there are two differences. First, we create another table, my_emp, with the rowdependencies option, and copy into it the data in emp: scott@ORA10G> create table my_emp rowdependencies as select * from emp; Table created. Next, we create the PL/SQL package opt_lock_scn_demo, which contains the procedure s get_emp_details and update_emp_info methods, this time working on the my_emp table and using an ora_rowscn-based implementation: scott@ORA10G> create or replace package opt_lock_scn_demo 2 as 3 procedure get_emp_details( p_empno in number, p_ename in out varchar2, 4 p_sal in out number, p_ora_rowscn in out number ); 5 procedure update_emp_info( p_empno in number, p_new_sal in number, 6 p_new_ename in varchar2, p_ora_rowscn in number, p_num_of_rows_updated in out number ); 7 end; 8 / Package created. scott@ORA10G> create or replace package body opt_lock_scn_demo 2 as 3 procedure get_emp_details( p_empno in number, p_ename in out varchar2, 4 p_sal in out number, p_ora_rowscn in out number ) 5 is 6 begin 7 select ename, sal, ora_rowscn 8 into p_ename, p_sal, p_ora_rowscn 9 from my_emp 10 where empno = p_empno;