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rather than conformance to Codd's rules Nonetheless, they are an important part of the history of the relational model Rule 1 is basically the informal definition of a relational database presented at the beginning of this section Rule 2 stresses the importance of primary keys for locating data in the database The table name locates the correct table, the column name finds the correct column, and the primary key value finds the row containing an individual data item of interest Rule 3 requires support for missing data through NULL values, which are described in 5 Rule 4 requires that a relational database be self-describing In other words, the database must contain certain system tables whose columns describe the structure of the database itself These tables are described in 16 Rule 5 mandates using a relational database language, such as SQL, although SQL is not specifically required.

Figure 20-20.

Part VI:

described in the Cursor-Based Repetition section earlier in this chapter, it combines the cursor definition and the OPEN, FETCH, and CLOSE statements into a single loop definition that also specifies the processing to be performed for each row of retrieved query results.

/* Add a customer procedure */

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Figure 20-21 shows the block structure specified by the SQL/PSM standard. It is quite a comprehensive structure, providing the following capabilities: I Labels the block of statements with a statement label I Declares local variables for use within the block I Declares local user-defined error conditions I Declares cursors for queries to be executed within the block I Declares handlers to process error conditions that arise I Defines the sequence of SQL statements to be executed These capabilities resemble some of those described earlier in the Statement Blocks section of this chapter for the Informix and Oracle dialect stored procedure dialects. Local variables within SQL/PSM procedures and functions (actually, within statement blocks) are declared using the DECLARE statement. Values are assigned

create procedure add_cust ( c_name c_num tgt_sls c_rep c_offc varchar(20), integer, numeric(16,2), integer, varchar(15)) /* input customer name */ /* input customer number */ /* input credit limit */ /* input target sales */ /* input salesrep emp # */ /* input office city */

Figure 20-21.

cred_lim numeric(16,2),

The language must be able to support all the central functions of a DBMS creating a database, retrieving and entering data, implementing database security, and so on Rule 6 deals with views, which are virtual tables used to give various users of a database different views of its structure It is one of the most challenging rules to implement in practice, and no commercial product fully satisfies it today Views and the problems of updating them are described in 14 Rule 7 stresses the set-oriented nature of a relational database It requires that rows be treated as sets in insert, delete, and update operations The rule is designed to prohibit implementations that only support row-at-a-time, navigational modification of the database Rule 8 and Rule 9 insulate the user or application program from the low-level implementation of the database.

using the SET statement. Functions return a value using the RETURN statement. Here is a statement block that might appear within a stored function, with examples of these statements:

/* Insert new row of CUSTOMERS table */ insert into customers (cust_num, company, cust_rep, credit_limit) values (c_num, c_name, c_rep, cred_lim); /* Update row of SALESREPS table */ update salesreps set quota = quota + quota + tgt_sls where empl_num = c_rep; /* Update row of OFFICES table */ update offices set target = target + tgt_sls where city = c_offc; /* Commit transaction and we are done */ commit work; end procedure;

FIGURE 20-3

20:

Once defined by the CREATE PROCEDURE statement, a stored procedure can be used. An application program may request execution of the stored procedure, using the appropriate SQL statement. Another stored procedure may call it to perform a specific function. The stored procedure may also be invoked through an interactive SQL interface. The various SQL dialects differ in the specific syntax used to call a stored procedure. Here is a call to the ADD_CUST procedure in the PL/SQL dialect:

/* Declare some local variables */ declare msg_text varchar(40); declare tot_amt decimal(16,2); /* Get the order total */ set tot_amt = get_tot_ords(); if (tot_amt > 0) then return (tot_amt); else return (0.00); end if end try_again

EXECUTE ADD_CUST('XYZ Corporation', 2137, 30000.00, 50000.00, 103, 'Chicago');

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