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create procedure sort_orders() /* Cursor for the query */ cursor o_cursor is select amount, company, name from orders, customers, salesreps where cust = cust_num and rep = empl_num; /* Row variable to receive query results values */ curs_row o_cursor%rowtype; begin /* Loop through each row of query results */ for curs_row in o_cursor loop /* Check for small orders and handle */ if (curs_row.amount < 1000.00) then insert into smallorders values (curs_row.name, curs_row.amount); /* Check for big orders and handle */ elsif (curs_row.amount > 10000.00) then insert into bigorders values (curs_row.company, curs_row.amount); end if; end loop; commit; end;
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FIGURE 20-13
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Figure 20-14 shows an equivalent stored procedure with the specialized FOR loop structure of Informix SPL. In this case, the query results are retrieved into ordinary local variables; there is no special row data type used. The FOREACH statement incorporates several different functions. It defines the query to be carried out, through the SELECT expression that it contains. It marks the beginning of the loop that is to be executed for each row of query results. (The end of the loop is marked by the END FOREACH statement.)
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create procedure sort_orders() /* Local variables to hold query results */ define ord_amt numeric(16,2); /* order amount */ varchar(20); /* customer name */ define c_name define r_name varchar(15); /* salesrep name */ /* Execute query and process each results row */ foreach select amount, company, name into ord_amt, c_name, r_name from orders, customers, salesreps where cust = cust_num and rep = empl_num; begin /* Check for small orders and handle */ if (ord_amt < 1000.00) then insert into smallorders values (r_name, ord_amt); /* Check for big orders and handle */ elif (ord_amt > 10000.00) then insert into bigorders values (c_name, ord_amt); end if; end; end foreach; end procedure;
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FIGURE 20-14
A cursor-based FOREACH loop in Informix SPL
When the FOREACH statement is executed, it carries out the query and then fetches rows of query results repeatedly, putting their column values into the local variables as specified in the statement. After each row is fetched, the body of the loop is executed. When there are no more rows of query results, the cursor is automatically closed, and execution continues with the next statement following the FOREACH. Note that in this example, the cursor isn t even assigned a specific name because all cursor processing is tightly specified within the single FOREACH statement.
PART VI
Part VI:
SQL Today and Tomorrow
The Transact-SQL dialect doesn t have a specialized FOR loop structure for cursorbased query results processing. Instead, the DECLARE CURSOR, OPEN, FETCH, and CLOSE statements of embedded SQL have direct counterparts within the Transact-SQL language. Figure 20-15 shows a Transact-SQL version of the sort_orders procedure. Note the
create proc sort_orders() as /* Local variables to hold query results */ declare @ord_amt declare @c_name declare @r_name decimal(16,2); varchar(20); varchar(15); /* order amount */ /* customer name */ /* salesrep name */
/* Declare cursor for the query */ declare o_curs cursor for select amount, company, name from orders, customers, salesreps where cust = cust_num and rep = empl_num begin /* Open cursor and fetch first row of results */ open o_curs fetch o_curs into @ord_amt, @c_name, @r_name /* If no rows, return immediately */ if (@@sqlstatus = 2) begin close o_curs return end /* Loop through each row of query results */ while (@@sqlstatus = 0) begin /* Check for small orders and handle */ if (@ord_amt < 1000.00) insert into smallorders values (@r_name, @ord_amt) /* Check for big orders and handle */ else if (curs_row.amount > 10000.00) insert into bigorders values (@c_name, @ord_amt) end /* Done with results; close cursor and return */ close o_curs end
FIGURE 20-15
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