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Note that a LIST rather than string interpolation is used in the last example You can achieve the same result using a here document with the print function:

Certain parameters affect the entire system, individual sessions, or both An example of a parameter that applies to the whole instance but can also be adjusted for individual sessions is OPTIMIZER_MODE This influences the way in which Oracle will execute statements A common choice is between the values ALL_ROWS and FIRST_ROWS ALL_ROWS instructs the optimizer to generate execution plans that will run the statement to completion as quickly as possible, whereas FIRST_ROWS instructs it to generate plans that will get something back to the user as soon as possible, even if the complete execution of the statement ultimately takes longer to complete So if your database is usually used for long DSS-type queries but some users use it for interactive work, you might issue the command

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Because the argument to the print function is a LIST, the individual elements of the list are evaluated before the results are passed to print, which then outputs the values You need to be careful when incorporating a print statement within a larger statement, especially one that itself uses a LIST context For example, the line

alter system set optimizer_mode=all_rows;

print "Hello ", print "How are you today ";

That gets the initial plumbing hooked up. Now it s time to write some code to customize the menu before it opens. In this case, you want to add the name of the file or directory as the first entry of the menu and enable/disable the menu items based on the item that was selected. Here s the code we wrote initially: protected void treeContextMenu_Popup (object sender, System.EventArgs e) { MyTreeNode treeNode = (MyTreeNode) treeView1.SelectedNode; string filename = null; bool deleteContents = false; bool viewInNotepad = false; bool launch = false; if (treeNode.Node is DirectoryNode) { DirectoryNode directoryNode = (DirectoryNode) treeNode.Node; filename = directoryNode.Name; deleteContents = true; viewInNotepad = false; } if (treeNode.Node is FileNode) { FileNode fileNode = (FileNode) treeNode.Node; filename = fileNode.Name; deleteContents = false; viewInNotepad = true; } treeContextMenu.MenuItems[menuIndexFilename].Text = filename; treeContextMenu.MenuItems[menuIndexDeleteContents].Enabled = deleteContents; treeContextMenu.MenuItems[menuIndexViewInNotepad].Enabled = viewInNotepad; } This code works, but the two if blocks are a good example of a poor design choice. The code for DirectoryNode and FileNode is essentially identical, but you still have to write separate code for each type of entry. Now is a good time to define an abstract class for the properties that are shared. It will be called BaseNode and will have abstract properties for the properties that DirectoryNode and FileNode share. A few properties will have the same implementation in BaseNode and DirectoryNode, which is the reason an abstract class is used instead of an interface. It turns out there are quite a few of them, which is another good indication that this is a good change to make:

The second element to the print function is evaluated first, resulting in the message, and then the resulting list values are output by print, which explains the 1 the return value from the nested print function To get around this problem, you can use parentheses to enclose the list of values for print,

alter session set optimizer_mode=first_rows;

print("Hello "),print "How are you today ";

There are a few parameters that can only be modified at the session level Principal among these is NLS_DATE_FORMAT This parameter, which controls the display of date and time values, can be specified in the parameter file but cannot be changed with ALTER SYSTEM So it is static, as far as the instance is concerned But it can be adjusted at the session level:

which correctly outputs the message Hello How are you today However, care should be taken with the parentheses, since you can also get unexpected results:

print (1+2)*3, "\n";

alter session set nls_date_format='dd-mm-yy hh24:mi:ss';

Only the first calculation is printed, since the parser assumes that the parentheses specify the LIST to the print function The remaining values are ignored, since they no

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