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Notice that this query appears, word for word, in the embedded DECLARE CURSOR statement in Figure 17-23. The statement also associates the cursor name repcurs with the query. This cursor name is used later in the OPEN CURSOR statement to start the query and position the cursor before the first row of query results. The FETCH statement inside the for loop fetches the next row of query results each time the loop is executed. The INTO clause of the FETCH statement works just like the INTO clause of the singleton SELECT statement. It specifies the host variables that are to receive the fetched data items one host variable for each column of query results. As in previous examples, a host indicator variable (repquota_ind) is used when a fetched data item may contain NULL values. When no more rows of query results are to be fetched, the DBMS returns the NOT FOUND warning in response to the FETCH statement. This is exactly the same warning code that is returned when the singleton SELECT statement does not retrieve a row of data. In this program, the WHENEVER NOT FOUND statement causes the precompiler to generate code that checks the SQLCODE value after the FETCH statement. This generated code branches to the label done when the NOT FOUND condition arises, and to the label error if an error occurs. At the end of the program, the CLOSE statement ends the query and terminates the program s access to the query results.

18:

17:

Dynamic SQL *

include sqlca; begin declare section; repname[16]; repquota; repsales; repquota_ind; end declare section;

dynamic queries, SQL combines the dynamic SQL features of the PREPARE and EXECUTE statements with extensions to the static SQL query-processing statements, and adds a new statement Here is an overview of how a program performs a dynamic query: 1 A dynamic version of the DECLARE CURSOR statement declares a cursor for the query Unlike the static DECLARE CURSOR statement, which includes a hard-coded SELECT statement, the dynamic form of the DECLARE CURSOR statement specifies the statement name that will be associated with the dynamic SELECT statement 2 The program constructs a valid SELECT statement in a buffer, just as it would construct a dynamic UPDATE or DELETE statement The SELECT statement may contain parameter markers like those used in other dynamic SQL statements 3.

/* /* /* /*

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The program uses the PREPARE statement to pass the statement string to the DBMS, which parses, validates, and optimizes the statement and generates an application plan This is identical to the PREPARE processing used for other dynamic SQL statements 4 The program uses the DESCRIBE statement to request a description of the query results that will be produced by the query The DBMS returns a column-by-column description of the query results in a SQL Data Area (SQLDA) supplied by the program, telling the program how many columns of query results there are, and the name, data type, and length of each column The DESCRIBE statement is used exclusively for dynamic queries 5 The program uses the column descriptions in the SQLDA to allocate a block of memory to receive each column of query results The program may also allocate space for an indicator variable for the column.

00) 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 tworow insertion can then be accomplished with two INSERTs and an UPDATE, as shown here: INSERT INTO SALESREPS (EMPL_NUM, NAME, REP_OFFICE, HIRE_DATE, SALES) VALUES (115,'Ben Adams', NULL, '01-APR-90', 000) INSERT INTO OFFICES (OFFICE, CITY, REGION, MGR, TARGET, SALES) VALUES (14,'Detroit', 'Eastern', 115, 000, 0.

retrieved salesperson name */ retrieved quota */ retrieved sales */ null quota indicator */

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