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Every embedded SQL statement ends with a terminator that signals the end of the SQL statement. The terminator varies with the style of the host language. In COBOL, the terminator is the string END-EXEC., which ends in a period like other COBOL statements. For PL/I and C, the terminator is a semicolon (;), which is also the statement termination character in those languages. In FORTRAN, the embedded SQL statement ends when no more continuation lines are indicated. The embedding technique shown in the three figures works for any SQL statement that (a) does not depend on the values of host language variables for its execution, and (b) does not retrieve data from the database. For example, the C program in Figure 17-7 creates a new REGIONS table and inserts two rows into it, using exactly the same embedded SQL features as the program in Figure 17-4. For consistency, all of the remaining program examples in the book will use the C programming language, except when a particular host language feature is being illustrated.

salespeople are automatically reassigned to that office The fourth problem (UPDATE of the primary key in the parent table) has similar complexity For example, suppose for some reason you wanted to change the office number of the Los Angeles office from 21 to 23 As with the previous example, the question is what should happen to the two child rows in the SALESREPS table that represent salespeople from the Los Angeles office Again, there are four logical possibilities: Prevent the office number from being changed until the salespeople are reassigned In this case, you should first add a new row to the OFFICES table with the new office number for Los Angeles, then update the SALESREPS table, and finally delete the old OFFICES row for Los Angeles.

17:

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In the IBM SQL products, the embedded DECLARE TABLE statement, shown in Figure 17-8, declares a table that will be referenced by one or more embedded SQL statements in your program. This is an optional statement that aids the precompiler in its task of parsing and validating the embedded SQL statements. By using the DECLARE TABLE statement, your program explicitly specifies its assumptions about the columns in the table and their data types and sizes. The precompiler checks the table and column references in your program to make sure they conform to your table declaration.

Figure 17-30.

Part V:

main() { exec sql include sqlca; /* Create a new REGIONS table */ exec sql create table regions (name char(15), hq_city char(15), manager integer, target decimal(9,2), sales decimal(9.2), primary key name, foreign key manager references salesreps); printf("Table created.\n"); /* Insert two rows; one for each region */ exec sql insert into regions values ('Eastern', 'New York', 106, 0.00, 0.00); exec sql insert into regions values ('Western', 'Los Angeles', 108, 0.00, 0.00); printf("Table populated.\n"); exit(); }

1. The program first prompts the user for a customer number and then queries the ORDERS table to locate all of the orders placed by that customer. 2. As it retrieves each row of query results, it displays the order information on the screen and asks the user what to do next. 3. If the user types an N, the program does not modify the current order, but moves directly to the next order. 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. Although it is primitive compared to 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 specifies that the positioned DELETE and UPDATE statements can be used only with cursors that meet these very strict criteria: I 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 programs in Figures 17-4, 17-5, and 17-6 all use the DECLARE TABLE statement. It s important to note that the statement appears purely for documentation purposes and for the use of the precompiler. It is not an executable statement, and you do not need to explicitly declare tables before referring to them in embedded DML or DDL statements. However, using the DECLARE TABLE statement does make your program more selfdocumenting and simpler to maintain. The IBM-developed SQL products all support the DECLARE TABLE statement, but most other SQL products do not support it, and their precompilers will generate an error message if you use it.

Figure 17-31.

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