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How do you test whether a given table name exists in a database For the sake of our discussion, let s say that the table name is TABLE_NAME. At least four possible solutions exist: Solution 1: Use the getTableNames() method as described earlier and then check to see if the list contains your desired table (e.g., TABLE_NAME). Solution 2: Execute the following SQL statement; if execution is successful (meaning there was no SQLException) then the table exists; otherwise the table does not exist: select * from TABLE_NAME where 1=0; This solution is preferable to others. Because the boolean expression 1=0 evaluates to false, no rows will be selected. This expression only checks whether or not the table exists (in other words, if the table exists, then it returns no records and no exception is raised; otherwise it will throw a SQLException). Solution 3: Execute the following SQL statement; if execution is successful (meaning there was no SQLException) then the table exists; otherwise the table does not exist: select count(*) from TABLE_NAME; This solution might require a full table scan (to obtain the number of rows or records), and therefore using this solution might be more expensive than the others. Solution 4: You may use a database vendor s catalog to find out if a given table exists (this will be a proprietary solution). Using an Oracle database, for example, you may execute the following SQL query: select object_name from user_objects where object_type = 'TABLE' and object_name = 'YOUR-TABLE-NAME'; If this query returns any rows, then the table does exist; otherwise it does not. This solution is an optimal one for Oracle databases (but it s not portable to other databases).

private void btnStartApp_Click(object sender, EventArgs e) { try { StartProgram(txtAppname.Text); }

@implementation BBParticle . . @synthesize r,g,b,a,startingLife; . .

catch (Exception ex) { MessageBox.Show(ex.Message.ToString()); } } 4. Press F5 to run your program. Enter Calc in the textbox, then click the button. What happens (You should see the Calculator program run.) Try it again, this time typing Notepad and then clicking the button. Now try it one more time using the following full path: C:\Program Files\Internet Explorer\ iexplore.exe. (This assumes you have Internet Explorer installed in this location.) To see the information written into the Debug object, select Debug Windows Immediate from the main menu. In this exercise, you have written a simple, general procedure called StartProgram. You could call it again from any other spot in your code by simply typing its name and providing the full path to an executable file in the textbox.

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Next you need to add a handful of new instance variables to your particle system class:

Solution 1: Use getTableNames()

In Exercise 5-1, it might have struck you that it would have been easier, and less code, just to call Process.Start() from within the button s Click event, rather than pass the name of the application to the procedure. And you would be right, for this short example, but what you re doing is setting up the StartProgram procedure so that it s available and ready once you decide you need, or want, to put more code around the start of your application. As you learn and know more about what you d like to do as an application starts, you can add that code to the StartProgram routine and only have to type it there once. You will modify the StartProgram routine to be more useful, but first you ll learn a little more about some procedure basics, such as when and how you can access procedures, and how to place them in a library.

@interface BBParticleSystem : BBSceneObject { . . . CGFloat CGFloat CGFloat CGFloat CGFloat CGFloat CGFloat CGFloat startR; startG; startB; startA; endR; endG; endB; endA;

Functions, like subs, are also procedures. The main difference between functions and subs is that a function always returns a value. Another difference is that functions can be used in an arithmetic expression. For example, the following is a function for calculating the average of three numbers. It takes three arguments and returns a value representing the average of those three numbers. VB .NET Private Function AvgSize(ByVal F1 As int16, ByVal F2 As int16, _ ByVal F3 As int16) As int32 Return (F1 + F2 + F3) / 3 End Function C# private int32 AvgSize(int16 F1 , int16 F2 , int16 F3 ) { return (F1 + F2 + F3) / 3; } Notice that in the C# example, the word Function does not exist. This is because C# does not make a formal distinction between subs and functions. They are both procedures, it s just

/** * Table Exist: Solution 1 * Check whether a given table (identified by a tableName * parameter) exists for a given connection object. * @param conn the Connection object * @param tableName the table name (to check to see if it exists) * @return true if table exists, otherwise return false. */

BOOL animateColor; . . }

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