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PL/SQL (Programming Language/SQL), originally known as the procedural option, was rst released in 1991 as part of Oracle version 6. It was modeled after Ada, a programming language that at the time was the standard programming language for the United States government. This may seem like an odd choice, but Oracle Corporation has always had close ties with the federal government. In fact, it is now well known that the CIA was Oracle s very rst customer. Unlike Transact-SQL, Oracle SQL is not considered a part of PL/SQL, but rather a separate language that can be invoked from within PL/SQL as needed. Like Microsoft SQL Server and Sybase Adaptive Server, Oracle provides a host of stored procedures with the database, mostly written in PL/SQL, and usually with names that begin with DBMS_ . The combination of SQL, PL/SQL, and the SQL*Plus client (which has its own set of commands) can be confusing at times because it is dif cult to remember to which language a particular statement belongs. However, other than nding which product manual describes the command when you need help with syntax, you don t have to worry much because SQL*Plus, Oracle SQL, and PL/SQL all interoperate seamlessly. Here is a table that provides an overview of PL/SQL language elements:
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Language Element BEGIN CALL CURSOR FOR LOOP Cursor statements
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Description Starts a block of statements. Calls a PL/SQL procedure as a subprogram. De nes a loop tied to a cursor that is repeated for each row returned by the cursor. Includes the DECLARE CURSOR, OPEN, FETCH, and CLOSE statements as described in 10. There are also special variables (attributes) associated with cursors to allow for operations such as testing whether a FETCH found a row of data or not. De nes PL/SQL variables. PL/SQL supports all the Oracle SQL data types, plus it adds a bunch of its own, including arrays, memory tables, record structures, and user-de ned types. Ends a block of statements. Marks the end of a LOOP or FOR LOOP. Starts a special section of the PL/SQL program that handles exceptions (errors) trapped during statement execution. A WHEN statement is included for each condition to be handled. Invokes (executes) a PL/SQL stored procedure. Exits from a loop. De nes a loop that iterates a numeric variable. An optional range can be included to control the number of loop executions. Transfers control (branches) unconditionally to a statement label. Evaluates one or more conditions, providing statements to execute when a condition evaluates to TRUE. De nes a simple loop that will execute continuously until stopped with an EXIT statement. Is a statement that does absolutely nothing (which reminds me of a few coworkers I once had). It is often used as a placeholder in a block of conditional statements. Raises an error condition. If a WHEN statement is de ned for the condition, it takes over to handle the condition; otherwise, the PL/SQL program fails.
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DECLARE
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END END LOOP EXCEPTION
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EXECUTE EXIT [WHEN] FOR LOOP
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RAISE
Language Element RETURN Transaction statements WHEN Description
SQL Demysti ed
Exits from a PL/SQL block or procedure, returning control to the block or procedure that invoked it. Includes the COMMIT, ROLLBACK, and SAVEPOINT statements as described in 9. Used in an EXCEPTION section, de nes an exception condition and the actions to be taken when the exception is raised. Note that exceptions can be raised when errors occur or when the RAISE statement is executed. Repeats statements while a speci c condition is TRUE.
WHILE
Quiz
Choose the correct responses to each of the multiple-choice questions. Note that there may be more than one correct response to each question. 1. A cursor is a. The collection of rows returned by a database query b. A pointer into a result set c. The same as a result set d. A buffer that holds rows retrieved from the database e. A method to analyze the performance of SQL statements 2. A result set is a. The collection of rows returned by a database query b. A pointer into a cursor c. The same as a cursor d. A buffer that holds rows retrieved from the database e. A method to analyze the performance of SQL statements 3. Before rows may be fetched from a cursor, the cursor must rst be a. Declared b. Committed c. Opened d. Closed e. Deallocated
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