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Database updates are usually triggered by real-world events, such as the receipt of a new order from a customer. In fact, receiving a new order would generate not just one, but this series of four updates to the sample database: Add the new order to the ORDERS table. Update the sales total for the salesperson who took the order. Update the sales total for the salesperson's office. Update the quantity-on-hand total for the ordered product. To leave the database in a self-consistent state, all four updates must occur as a unit. If a system failure or another error creates a situation where some of the updates are processed and others are not, the integrity of the database will be lost. Similarly, if another user calculates totals or ratios part way through the sequence of updates, the calculations will be incorrect. The sequence of updates must thus be an "all-or-nothing" proposition in the database. SQL provides precisely this capability through its transaction processing features, which are described in this chapter.

18:

I The EXECUTE statement asks the DBMS to execute a dynamic statement previously compiled by a PREPARE statement. It also supplies parameter values for the statement that is to be executed. I The DESCRIBE statement returns a description of a previously prepared dynamic statement into a SQLDA. If the dynamic statement is a query, the description includes a description of each column of query results. I The DECLARE CURSOR statement for a dynamic query specifies the query by the statement name assigned to it when it was compiled by the PREPARE statement. I The OPEN statement for a dynamic query passes parameter values for the dynamic SELECT statement and requests query execution. I The FETCH statement for a dynamic query fetches a row of query results into program data areas specified by a SQLDA structure. I The CLOSE statement for a dynamic query ends access to the query results.

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Dynamic SQL*

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printf("\n"); /* Loop printing data for each column of the row */ for (i = 0; i < colcount; I++) { /* Find the SQLVAR for this column; print column label */ qry_var = qry_da->sqlvar + I; printf(" Column # %d (%s): ", i+1, qry_var->sqlname); /* Check indicator variable for NULL indication */ if (*(qry_var -> sqlind)) != 0) { puts("is NULL!\n"); continue; } /* Actual data returned; handle each type separately */ switch (qry_var -> sqltype) { case 448: case 449: /* VARCHAR data - just display it */ puts(qry_var -> sqldata); break; case 496: case 497: /* Four-byte integer data - convert & display it */ printf("%ld", *((int *) (qry_var->sqldata))); break; case 500: case 501: /* Two-byte integer data - convert & display it */ printf("%d", *((short *)(qry_var->sqldata))); break; case 480: case 481: /* Floating-point data - convert & display it */ printf("%lf", *((double *)(qry_var->sqldat))); break; } } } no_more_data: printf("\nEnd of data.\n"); /* Clean up allocated storage */

FIGURE 18-9

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