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When the application is executing and reaches the Try block, it just steps into the Try block and executes whatever code it finds within If an exception is thrown at any point, execution immediately jumps out of the Try block, and the CLR starts to look for a way for the exception to be handled In this case, there is a Catch block that accepts an exception of type SqlException This is a specific exception thrown by SQL Server So, this Catch block will be used to handle only that type of exception: Catch ex As SqlException .. Any other kind of exception will be propagated back to the caller; that is, it will be an unhandled exception Regardless of whether or not an exception is thrown, the database connection that was opened earlier in the page must be closed This is your cleanup code: Finally con.

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One example of every possible row in the inputs One example of each row that appear in both inputs One example of each row from the first input that does not appear in the second input

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Close() End Try In this code, you have just a single Catch block, which will catch SQL execution exceptions The problem is that different types of exceptions require different handling, and you must be prepared for them Right now, you re simply ignoring them What you need is to further identify the type of exception that is thrown and have different Catch blocks to handle these different types of exception in different ways That s what you ve started to do here Instead of one Catch block, you now have three: Catch ex As SqlException .. lblMessageText = _ "Insert couldn't be performed User name may be already taken" Catch ex As OutOfMemoryException .. lblMessageText = "We just run of out memory, " + _ "please restart the application!" Catch ex As Exception .. lblMessage.

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The need to eliminate duplicates will probably make you think of sorting and the distinct operator so let s take a look at what Oracle does with these set operations. In the script set_ops.sql in the online code suite, I have created two very simple tables: create table t1 as select rownum id, ao.* from all_objects ao where rownum <= 2500 ; create table t2 as select rownum id, ao.* from all_objects ao where rownum <= 2000 ;

Before using the JasperReports distribution files and samples, install the Ant tool on your machine. JasperReports relies heavily on the Ant build tool from the Apache Foundation (http://ant.apache.org) to compile the source files, build the distribution files, generate the Javadoc documentation, and run the samples. The Ant build tool will make working with the JasperReports library easier. Please refer to the Ant documentation for installation instructions.

Text = "Couldn't update your profile!" Finally The first Catch block handles only exceptions of type SqlException The SqlException class inherits from the base class for all exceptions, the Exception class SqlException is a special type of Exception that is created when the SQL Server NET data provider comes across an error generated by the database Within this Catch block, you can write special exceptionhandling code for this type of exception (In this case, to keep it simple, we just customized the error message to reflect what we ve detected) The next Catch block handles only exceptions of type OutOfMemoryException This type of exception occurs when the application server doesn t have enough memory left to continue executing the application Again, you have special code within this Catch block to handle this type of exception; this code is different from the code in the first Catch block..

With this definition, table t2 happens to be a proper subset of table t1, containing exactly 2,000 of the rows that also exist in t1. To demonstrate the effects of the three set operations, I need only run three queries (plus one spare to demonstrate the nonsymmetrical nature of the minus operator), with the results shown in Table 13-7.

select * from t1 union select * from t2 select * from t1 intersect select * from t2 select * from t1 minus select * from t2 select * from t2 minus select * from t1

You ve written exception-handling code in anticipation of a database error or out-ofmemory error, but what if the Try block code throws a different type of error You ve added a final generic Catch block to catch those, as every exception will inherit from the Exception class. This Catch block needs to contain more generic exception-handling code, because you cannot be sure exactly what the problem is.

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