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If the SQLDA turns out to be too small for the query, the SQLD value tells the program how large the SQLDA must be, and it can allocate a larger one and DESCRIBE the statement again into that SQLDA The DESCRIBE statement is normally used for dynamic queries, but you can ask the DBMS to DESCRIBE any previously prepared statement This feature is useful, for example, if a program needs to process an unknown SQL statement typed by a user The program can PREPARE and DESCRIBE the statement and examine the SQLD field in the SQLDA If the SQLD field is zero, the statement text was not a query, and the EXECUTE statement can be used to execute it If the SQLD field is positive, the statement text was a query, and the OPEN/FETCH/CLOSE statement sequence must be used to execute it..

The MATCH PARTIAL option allows NULL values in parts of a foreign key, so long as the non-NULL values match the corresponding parts of some primary key in the parent table With this option, NULL value handling in delete and update rules proceeds as previously described..

FIGURE 17-32

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The dynamic DECLARE CURSOR statement, shown in Figure 18-11, is a variation of the static DECLARE CURSOR statement. Recall from 17 that the static DECLARE CURSOR statement literally specifies a query by including the SELECT statement as one of its clauses. By contrast, the dynamic DECLARE CURSOR statement specifies the query indirectly, by specifying the statement name associated with the query by the PREPARE statement. Like the static DECLARE CURSOR statement, the dynamic DECLARE CURSOR statement is a directive to the SQL precompiler rather than an executable statement. It must appear before any other references to the cursor that it declares. The cursor name declared by

Using the positioned DELETE and UPDATE statements (continued)

18:

4. If the user types a D, the program deletes the current order using a positioned DELETE statement. 5. If the user types a U, the program prompts the user for a new quantity and amount, and then updates these two columns of the current order using a positioned UPDATE statement. 6. If the user types an X, the program halts the query and terminates.

Dynamic SQL *

Part V:

Figure 18-11.

Advanced Constraint Capabilities (SQL2)

Although it is primitive compared with a real application program, the example in Figure 17-32 shows all of the logic and embedded SQL statements required to implement a browsing application with cursor-based database updates The SQL1 standard specified that the positioned DELETE and UPDATE statements can be used only with cursors that meet these very strict criteria: The query associated with the cursor must draw its data from a single source table; that is, there must be only one table named in the FROM clause of the query specified in the DECLARE CURSOR statement The query cannot specify an ORDER BY clause; the cursor must not identify a sorted set of query results The query cannot specify the DISTINCT keyword The query must not include a GROUP BY or a HAVING clause The user must have the UPDATE or DELETE privilege (as appropriate) on the base table.

this statement is used in subsequent OPEN, FETCH, and CLOSE statements to process the results of the dynamic query.

The IBM databases (DB2 and SQL/DS) extended the SQL1 restrictions a step further They require that the cursor be explicitly declared as an updateable cursor in the DECLARE CURSOR statement The extended IBM form of the DECLARE CURSOR statement is shown in Figure 17-33 In addition to declaring an updateable cursor, the FOR UPDATE clause can optionally specify particular columns that may be updated through the cursor If the column list is specified in the cursor declarations, positioned UPDATE statements for the cursor may update only those columns In practice, all commercial SQL implementations that support positioned DELETE and UPDATE statements follow the IBM SQL approach It is a great advantage for the DBMS to know, in advance, whether a cursor will be used for updates or whether its data will be read-only, because read-only processing is simpler.

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