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An embedded SQL program written in C
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IDENTIFICATION DIVISION. PROGRAM-ID. SAMPLE. ENVIRONMENT DIVISION. DATA DIVISION. FILE SECTION. WORKING-STORAGE SECTION. EXEC SQL INCLUDE SQLCA. EXEC SQL DECLARE SALESREPS TABLE (EMPL_NUM INTEGER NOT NULL, NAME VARCHAR(15) NOT NULL, AGE INTEGER, REP_OFFICE INTEGER, TITLE VARCHAR(10), HIRE_DATE DATE NOT NULL, MANAGER INTEGER, QUOTA MONEY, SALES MONEY NOT NULL) END-EXEC. PROCEDURE DIVISION. * * DISPLAY A MESSAGE FOR THE USER DISPLAY "Deleting salesreps with low quota.". * * EXECUTE THE SQL STATEMENT EXEC SQL DELETE FROM SALESREPS WHERE QUOTA < 150000 END EXEC. * * DISPLAY ANOTHER MESSAGE DISPLAY "Finished deleting.".
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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.
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PROGRAM SAMPLE 100 FORMAT (' ',A35) EXEC SQL INCLUDE SQLCA EXEC SQL DECLARE SALESREPS C (EMPL_NUM C NAME C AGE C REP_OFFICE C TITLE C HIRE_DATE C MANAGER C QUOTA C SALES * * * *
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TABLE INTEGER NOT NULL, VARCHAR(15) NOT NULL, INTEGER, INTEGER, VARCHAR(10), DATE NOT NULL, INTEGER, MONEY, MONEY NOT NULL)
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DISPLAY A MESSAGE FOR THE USER WRITE (6,100) 'Deleting salesreps with low quota.' EXECUTE THE SQL STATEMENT EXEC SQL DELETE FROM REPS C WHERE QUOTA < 150000 DISPLAY ANOTHER MESSAGE WRITE (6,100) 'Finished deleting.' RETURN END
Figure 17-6.
An embedded SQL program written in FORTRAN
Declaring Tables
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. 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
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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 money, sales money, 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(); }
Figure 17-7.
Using embedded SQL to create a table
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 self-documenting 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.
Error Handling
When you type an interactive SQL statement that causes an error, the interactive SQL program displays an error message, aborts the statement, and prompts you to type a new statement. In embedded SQL, error handling becomes the responsibility of the application program. Actually, embedded SQL statements can produce two distinct types of errors:
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