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The DBMS sets the SQLCODE/SQLSTATE values to indicate any errors found in the statement and retains the application plan for later execution Note that the DBMS does not execute the plan in response to the PREPARE statement 3 When the program wants to execute the previously prepared statement, it uses the EXECUTE statement and passes a value for each parameter marker to the DBMS This is Step 2 of the DBMS interaction The DBMS substitutes the parameter values, executes the previously generated application plan, and sets the SQLCODE/SQLSTATE values to indicate its completion status 4 The program can use the EXECUTE statement repeatedly, supplying different parameter values each time the dynamic statement is executed The DBMS can simply repeat Step 2 of the interaction, since the work in Step 1 has already been done, and the results of that work (the application plan for execution) will still be valid.

DEALLOCATE PREPARE statement provides this capability. When the DBMS processes this statement, it can free the resources associated with the compiled statement, which will usually include some internal representation of the application plan for the statement. The statement named in the DEALLOCATE PREPARE statement must match the name specified in a previously executed PREPARE statement. In the absence of a capability like that provided by DEALLOCATE PREPARE, the DBMS has no way of knowing whether a previously prepared statement will be executed again or not, and so must retain all of the information associated with the statement. In practice, some DBMS brands maintain the compiled version of the statement only until the end of a transaction; in these systems, a statement must be reprepared for each subsequent transaction where it is used. Because of the overhead involved in this process, other DBMS brands maintain the compiled statement information indefinitely. The DEALLOCATE PREPARE can play a more important role in these systems, where a database session might last for hours. Note, however, that the SQL2 standard explicitly says that whether a prepared statement is valid outside of the transaction in which it is prepared is implementation dependent. The SQL2 extension to the DB2-style EXECUTE statement may be even more useful in practice. It allows the EXECUTE statement to be used to process simple singleton SELECT statements that return a single row of query results. Like the DB2 EXECUTE statement, the SQL2 statement includes a USING clause that names the host variables

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Figure 18-4 shows a C program that uses these steps, which are labeled by the callout numbers in the figure The program is a general-purpose table update program It prompts the user for a table name and two column names, and constructs an UPDATE statement for the table that looks like this:.

Note also that these constraint attributes only define the deferrability of a constraint that is, whether or not its operation can be deferred The constraint definition may also specify the initial state of the constraint: An INITIALLY IMMEDIATE constraint is one that "starts out" as an immediate constraint That is, it will be checked immediately for each SQL statement An INITIALLY DEFERRED constraint is one that "starts out" as a deferred constraint That is, its checking will be deferred until the end of a transaction Of course, this option cannot be specified if the constraint is defined as NOT DEFERRABLE The constraint is put into the specified initial state when it is first created It is also reset into this initial state at the beginning of each transaction Because it provides the most stringent integrity checking, INITIALLY IMMEDIATE is the default.

The user s input thus determines the table to be updated, the column to be updated, and the search condition to be used. The search comparison value and the updated data value are specified as parameters, to be supplied later when the UPDATE statement is actually executed.

that supply the values for parameters in the statement being executed. But the SQL2 statement also permits an optional INTO clause that names the host variables that receive the values returned by a single-row query. Suppose you have written a program that dynamically generates a query statement that retrieves the name and quota of a salesperson, with the salesperson s employee number as an input parameter. Using DB2-style dynamic SQL, even this simple query involves the use of a SQLDA, cursors, a FETCH statement loop, and so on. Using SQL2 dynamic SQL, the statement can be executed using the simple two-statement sequence:

Part V:

PREPARE qrystmt FROM :statement_buffer; EXECUTE qrystmt USING :emplnum INTO :name, :quota;

main() { /* This is a general-purpose update program. It can be used for any update where a numeric column is to be updated in all rows where a second numeric column has a specified value. For example, you can use it to update quotas for selected salespeople or to update credit limits for selected customers. */ exec sql exec sql char float float exec sql char char char char include sqlca; begin declare section; stmtbuf[301] /* SQL text to be executed */ /* parameter value for searching */ search_value; new_value; /* parameter value for update */ end declare section; /* /* /* /* table to be updated */ name of search column */ name of update column */ yes/no response from user */

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