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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:

They specify that specific access or storage techniques used by the DBMS, and even changes to the structure of the tables in the database, should not affect the user's ability to work with the data Rule 10 says that the database language should support integrity constraints that restrict the data that can be entered into the database and the database modifications that can be made This is another of the rules that is not supported in most commercial DBMS products Rule 11 says that the database language must be able to manipulate distributed data located on other computer systems Distributed data and the challenges of managing it are described in 20 Finally, Rule 12 prevents "other paths" into the database that might subvert its relational structure and integrity..

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The values to be used for the procedure s parameters are specified, in order, in a list that is enclosed by parentheses. When called from within another procedure or a trigger, the EXECUTE statement may be omitted, and the call becomes simply:

declare bad_err condition for sqlstate 12345 ; declare my_err condition;

ADD_CUST('XYZ Corporation', 2137, 30000.00, 50000.00, 103, 'Chicago');

Once the condition has been defined, you can force the condition to occur through the execution of a SQL routine with the SIGNAL statement:

20:

signal bad_err; signal sqlstate 12345 ;

The procedure may also be called using named parameters, in which case the parameter values can be specified in any sequence. Here is an example:

Summary

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

EXECUTE ADD_CUST (c_name = 'XYZ Corporation', c_num = 2137, cred_lim = 30000.00, c_offc = 'Chicago', c_rep = 103, tgt_sales = 50000.00);

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:

EXECUTE ADD_CUST 'XYZ Corporation', 2137, 30000.00, 50000.00, 103, 'Chicago';

/* 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;

The parentheses aren t required, and the values to be used for parameters again form a comma-separated list. The keyword EXECUTE can be abbreviated to EXEC, and the parameter names can be explicitly specified in the call, allowing you to specify the parameter values in any order you wish. Here is an alternative, equivalent Transact-SQL call to the ADD_CUST stored procedure:

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.

EXEC ADD_CUST @C_NAME @C_NUM @CRED_LIM @C_OFFC @C_REP @TGT_SLS = = = = = = 'XYZ Corporation', 2137, 30000.00, 'Chicago', 103, 50000.00;

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