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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 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: 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. 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. 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:

23:

/* 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;

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In addition to the remote data access request, Figure 23-2 also shows a client/server request to the remote database from a (different) PC user Note that, from the standpoint of the remote database, there is very little difference between processing the request from the PC client and processing the remote database access request In both cases, a SQL request arrives across the network and the remote database determines that the user making the request has appropriate privileges and then carries it out And, in both cases, the status of the SQL processing is reported back across the network The local database in Figure 23-2 must do some very different work than the process it normally uses to process local database requests, however.

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 condition-handler routines.

There are several complications for the local DBMS: I It must determine which remote database the user wants to access, and how it can be accessed on the network I It must establish a connection to the remote database for carrying out remote requests I It must determine how the local user authentication and privilege scheme maps to the remote database That is, does it simply pass the user name/password supplied for local database access to the remote database, or is a different remote user name/password supplied, or should some kind of automatic mapping be performed In effect, the local DBMS becomes an agent for the user making the remote access request It becomes a client in a client/server connection to the remote DBMS Several of the leading enterprise DBMS vendors offer the kind of remote database access capability shown in Figure 23-2.

The ANSI/ISO standard specifies that SQL constants for character data be enclosed in single quotes ('. . .'), as in these examples: 'Jones, John J.' 'New York' 'Western'

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 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:

They differ in the specific way that remote access is presented to the user and to the database administrator In some cases, they involve extensions to the SQL language accepted by the DBMS In others, the extra mechanisms for establishing remote access are mostly external to the SQL language Sybase offers a simple entry-level remote database access capability While connected to a local Sybase installation, the user can issue a CONNECT TO SQL statement, naming a remote server that is known to the local server For example, if a remote server named CENTRALHOST contains a copy of the sample database, then this statement:.

create function combo(a, b) a integer; b integer; returns integer; as return (a+b);

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