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It s easiest to explain the basics of stored procedures through an example. Consider the process of adding a customer to the sample database. Here are the steps that may be involved: 1. Obtain the customer number, name, credit limit, and target sales amount for the customer, as well as the assigned salesperson and office. 2. Add a row to the customer table containing the customer s data. 3. Update the row for the assigned salesperson, raising the quota target by the specified amount. 4. Update the row for the office, raising the sales target by the specified amount. 5. Commit the changes to the database, if all were successful. Without a stored procedure capability, here is a SQL statement sequence that does this work for XYZ Corporation, new customer number 2137, with a credit limit of $30,000 and first-year target sales of $50,000 to be assigned to Paul Cruz (employee #103) of the Chicago office:
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INSERT INTO VALUES UPDATE SET WHERE CUSTOMERS (CUST_NUM, COMPANY, CUST_REP, CREDIT_LIMIT) (2137, XYZ Corporation , 103, 30000.00); SALESREPS QUOTA = QUOTA + 50000.00 EMPL_NUM = 103;
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Database Processing and Stored Procedures
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UPDATE OFFICES SET TARGET = TARGET + 50000.00 WHERE CITY = Chicago ; COMMIT;
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With a stored procedure, all of this work can be embedded into a single defined SQL routine. Figure 20-1 shows a stored procedure for this task, expressed in Oracle s PL/SQL stored procedure dialect. The procedure is named ADD_CUST, and it accepts six parameters the customer name, number, credit limit, and target sales, the
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/* Add a customer procedure */ create procedure add_cust ( c_name in varchar(20), /* input customer name */ c_num in integer, /* input customer number */ cred_lim in number(16,2), /* input credit limit */ tgt_sls in number(16,2), /* input target sales */ c_rep in integer, /* input salesrep emp # */ c_offc in varchar(15)) /* input office city */ as begin /* 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; end;
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A basic stored procedure in PL/SQL
SQL: The Complete Reference
employee number of the assigned salesperson, and the city where the assigned sales office is located. Once this procedure has been created in the database, a statement like this one:
ADD_CUST( XYZ Corporation , 2137, 30000.00, 50000.00, 103, Chicago )
calls the stored procedure and passes it the six specified values as its parameters. The DBMS executes the stored procedure, carrying out each SQL statement in the procedure definition one by one. If the ADD_CUST procedure completes its execution successfully, a committed transaction has been carried out within the DBMS. If not, the returned error code and message indicates what went wrong.
Using Stored Procedures
The procedure defined in Figure 20-1 illustrates several of the basic structures common to all SPL dialects. Nearly all dialects use a CREATE PROCEDURE statement to initially define a stored procedure. A corresponding DROP PROCEDURE statement is used to discard procedures that are no longer needed. The CREATE PROCEDURE statement defines the following. I The name of the stored procedure I The number and data types of its parameters I The names and data types of any local variables used by the procedure I The sequence of statements executed when the procedure is called The following sections describe these elements and the special SQL statements that are used to control the flow of execution within the body of a stored procedure.
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