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Stored Procedures, Functions, Triggers, and the SQL Standard
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The development of DBMS stored procedures, functions, and triggers has been largely driven by DBMS vendors and the competitive dynamics of the database industry. Sybase s initial introduction of stored procedures and triggers in SQL Server triggered a competitive response, and by the mid-1990s, many of the enterprise-class systems had added their own proprietary procedural extensions to SQL. Stored procedures were not a focus of the SQL standard, but became a part of the standardization agenda after the 1992 publication of the SQL2 standard. The work on stored procedure standards was split off from the broader object-oriented extensions that were proposed for SQL3, and was focused on a set of procedural extensions to the SQL language. The result was a new part of the SQL standard, published in 1996 as SQL/Persistent Stored Modules (SQL/PSM), International Standard ISO/IEC 9075-4. The actual form of the standard specification is a collection of additions, edits, new paragraphs, and replacement paragraphs to the 1992 SQL2 standard (ISO/IEC 9075:1992). In addition to being a modification of the SQL standard, SQL/PSM was also drafted as a part of the planned followon standard, which was called SQL3 during its drafting. The development of the follow-on standard took longer than expected, but SQL/PSM eventually took its place as Part 4 of the SQL3 standard, officially known as SQL:1999. The SQL Call-Level Interface (CLI) standard, described in 19, was treated the same way; it is now Part 3 of the SQL standard.
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PART VI
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When the SQL:1999 standard was published, selected parts of SQL/PSM that are used by other parts of the standard were moved to the core SQL/Foundation specification (Part 1). The SQL/PSM standard published in 1996 addressed only stored procedures and functions; it explicitly did not provide a specification of a trigger facility for the ISO SQL standard. The standardization of trigger functions was considered during the development of the SQL2 and SQL/PSM standards, but the standards groups determined that triggers were too closely tied to other object-oriented extensions proposed for SQL3. The SQL:1999 standard that resulted from the SQL3 work finally provided an ANSI/ISO standard trigger facility. The publication of the SQL/PSM and SQL:1999 standards lagged the first commercial implementation of stored procedures and triggers by many years. By the time the standard was adopted, most enterprise DBMS vendors had responded to user enthusiasm and competitive pressure by introducing stored procedure and trigger capabilities in their products. Unlike some other SQL extensions where IBM s clout and a DB2 implementation had set a de facto standard, the major DBMS vendors implemented stored procedures and triggers in different, proprietary ways, and in some cases, competed with one another based on unique features of their implementations. As a result, the ANSI/ISO standardization of stored procedures and triggers has had little impact on the DBMS market to date. It s reasonable to expect that ANSI/ ISO implementations will find their way into major DBMS products over time, but as a complement to, rather than a replacement for, the proprietary implementations.
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The SQL/PSM Stored Procedures Standard
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The capabilities specified in the SQL/PSM standard parallel the core features of the proprietary stored procedure capabilities of today s DBMS systems. They include SQL language constructs to: Define and name procedures and functions written in the extended SQL language Invoke (call) a previously-defined procedure or function Pass parameters to a called procedure or function, and obtain the results of its execution Declare and use local variables within the procedure or function Group a block of SQL statements together for execution Conditionally execute SQL statements (IF THEN ELSE) Repeatedly execute a group of SQL statements (looping) The SQL/PSM standard specifies two types of SQL-invoked routines. A SQL-procedure is a routine that can return any number of values or no value at all. It is called with a CALL statement:
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As with the proprietary stored procedure languages illustrated in the previous examples throughout this chapter, SQL/PSM stored procedures accept parameters passed via the CALL statement. SQL/PSM stored procedures can also pass data back to their caller via output parameters, again mirroring the capabilities of the proprietary stored procedure languages. SQL/PSM also supports combined input/output parameters, like some of the proprietary languages.
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