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The EXECUTE IMMEDIATE statement is the simplest form of dynamic SQL, but it is very versatile. You can use it to dynamically execute most DML statements, including INSERT, DELETE, UPDATE, COMMIT, and ROLLBACK. You can also use EXECUTE IMMEDIATE to dynamically execute most DDL statements, including the CREATE, DROP, GRANT, and REVOKE statements. The EXECUTE IMMEDIATE statement does have one significant limitation, however. You cannot use it to dynamically execute a SELECT statement, because it does not provide a mechanism to process the query results. Just as static SQL requires cursors and specialpurpose statements (DECLARE CURSOR, OPEN, FETCH, and CLOSE) for programmatic queries, dynamic SQL uses cursors and some new special-purpose statements to handle dynamic queries. The dynamic SQL features that support dynamic queries are discussed later in the section Dynamic Queries. As a note of caution, user input should not be placed directly into SQL statements (as shown in the preceding simplified examples) without first parsing them for escape and termination characters. Doing so would permit a hacker to include characters in the input that would terminate the intended SQL statement and append another one to the end of it allowing unauthorized access to other data in the database a technique known as sql injection.

INSERT INTO SALESREPS (EMPL_NUM, NAME, REP_OFFICE, HIRE_DATE, SALES) VALUES (115,'Ben Adams', 14, '01-APR-90', 0.00) INSERT INTO OFFICES (OFFICE, CITY, REGION, MGR, TARGET, SALES) VALUES (14,'Detroit', 'Eastern', 115, 0.00, 0.00)

18:

Unfortunately, the first INSERT statement (for Ben Adams) will fail. Why Because the new row refers to office number 14, which is not yet in the database! Of course, reversing the order of the INSERT statements doesn t help:

Dynamic SQL*

UPDATING DATA INSERT INTO OFFICES (OFFICE, CITY, REGION, MGR, TARGET, SALES) VALUES (14,'Detroit', 'Eastern', 115, 0.00, 0.00) INSERT INTO SALESREPS (EMPL_NUM, NAME, REP_OFFICE, HIRE_DATE, SALES) VALUES (115,'Ben Adams', 14, '01-APR-90', 0.00)

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A DEFERRABLE constraint is one whose checking can be deferred to the end of a transaction The assertion in the previous example is one that should be deferrable When updating quotas or adding new salespeople to the database, you certainly want to be able to defer constraint checking, as the example showed A NOT DEFERRABLE constraint is one whose checking cannot be deferred A primary key constraint, a uniqueness constraint, and many column check constraints would usually fall into this category These data integrity checks typically don't depend on other database interactions They can be, and should be, checked after every SQL statement that tries to modify the database Because it provides the most stringent integrity checking, NOT DEFERRABLE is the default You must explicitly declare a constraint to be DEFERRABLE if you want to defer its operation.

The EXECUTE IMMEDIATE statement provides one-step support for dynamic statement execution As described previously, the DBMS goes through all five steps of Figure 18-1 for the dynamically executed statement The overhead of this process can be very significant if your program executes many dynamic statements, and it s wasteful if the statements to be executed are identical or very similar In practice, the EXECUTE IMMEDIATE statement should be used only for one-time statements that will be executed once by a program and then never executed again To deal with the large overhead of the one-step approach, dynamic SQL offers an alternative, two-step method for executing SQL statements dynamically.

The first INSERT statement (for Detroit this time) will still fail, because the new row refers to employee number 115 as the office manager, and Ben Adams is not yet in the database! To prevent this insertion deadlock, at least one of the foreign keys in a referential cycle must permit NULL values. In the actual definition of the sample database, the MGR column does not permit NULLs, but the REP_OFFICE does. The two-row insertion can then be accomplished with two INSERTs and an UPDATE, as shown here:

In practice, this two-step approach, separating statement preparation and statement execution, is used for all SQL statements in a program that is executed more than once, and especially for those that are executed repeatedly, hundreds or thousands of times, in response to user interaction Here is an overview of the two-step technique: 1 The program constructs a SQL statement string in a buffer, just as it does for the EXECUTE IMMEDIATE statement A question mark ( ) can be substituted for a constant anywhere in the statement text to indicate that a value for the constant will be supplied later The question mark is called a parameter marker, but developers often use the term placeholder 2 The PREPARE statement asks the DBMS to parse, validate, and optimize the statement and to generate an application plan for it This is Step 1 of the DBMS interaction.

INSERT INTO SALESREPS (EMPL_NUM, NAME, REP_OFFICE, HIRE_DATE, SALES) VALUES (115,'Ben Adams', NULL, '01-APR-90', 0.00) INSERT INTO OFFICES (OFFICE, CITY, REGION, MGR, TARGET, SALES) VALUES (14,'Detroit', 'Eastern', 115, 0.00, 0.00) UPDATE SALESREPS SET REP_OFFICE = 14 WHERE EMPL_NUM = 115

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