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/* Declare some local variables */ declare msg_text varchar(40); declare tot_amt decimal(16,2); /* Get the order total */ set tot_amt = get_tot_ords(); if (tot_amt > 0) then return (tot_amt); else return (0.00); end if end try_again
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The block structure specified by the SQL/PSM standard provides fairly comprehensive support for error handling. The standard specifies predefined conditions that can be detected and handled, including: I SQLWARNING. One of the warning conditions specified in the SQL2 standard I NOT FOUND. The condition that normally occurs when the end of a set of query results is reached with a FETCH statement I SQLSTATE values. A test for specific SQLSTATE error codes I User-defined conditions. A condition named by the stored procedure Conditions are typically defined in terms of SQLSTATE values. Rather than using numerical SQLSTATE codes, you can assign the condition a symbolic name. You can also specify your own user-defined condition:
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declare bad_err condition for sqlstate 12345 ; declare my_err condition;
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Once the condition has been defined, you can force the condition to occur through the execution of a SQL routine with the SIGNAL statement:
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To handle error conditions that may arise, SQL/PSM allows you to declare a condition handler. The declaration specifies the list of conditions that are to be handled
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and the action to be taken. It also specifies the type of condition handling. The types differ in what happens to the flow of control after the handler is finished with its work: I CONTINUE type. After the condition handler completes its work, control returns to the next statement following the one that caused the condition. That is, execution continues with the next statement. I EXIT type. After the condition handler completes its work, control returns to the end of the statement block containing the statement that caused the condition. That is, execution effectively exits the block. I UNDO type. After the condition handler completes its work, all modifications are undone to data in the database caused by statements within the same statement block as the statement causing the error. The effect is the same as if a transaction had been initiated at the beginning of the statement block and was being rolled back. Here are some examples that show the structure of the handler definition:
/* Handle SQL warnings here, then continue */ declare continue handler for sqlwarning call my_warn_routine(); /* Handle severe errors by undoing effects */ declare undo handler for user_disaster begin /* Do disaster cleanup here */ . . . end;
Error handling can get quite complex, and it s possible for errors to arise during the execution of the handler routine itself. To avoid infinite recursion on errors, the normal condition signaling does not apply during the execution of a condition handler. The standard allows you to override this restriction with the RESIGNAL statement. It operates just like the SIGNAL statement, but is used exclusively within conditionhandler routines.
Routine Name Overloading
The SQL/PSM standard permits overloading of stored procedure and function names. Overloading is a common attribute in object-oriented systems and is a way to make stored routines more flexible in handling a wide variety of data types and situations. Using the overloading capability, several different routines can be given the same routine name. The multiple routines defined with the same name must differ from
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Database Processing and Stored Procedures
one another in the number of parameters that they accept or in the data types of the individual parameters. For example, you might define these three stored functions:
create function combo(a, b) a integer; b integer; returns integer; as return (a+b) create function combo(a, b, c) a integer; b integer; c integer; returns integer; as return (a+b+c) create procedure combo(a, b) a varchar(255); b varchar(255); returns varchar(255); as return (a || b)
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