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As you can see, the details of row-by-row query processing within the for loop of the program will differ dramatically from those in Figure 18-9. Having processed all rows of query results, the program closes the cursor at callout 8. The CLOSE statement remains unchanged under SQL2. Following the closing of the cursor, it would be good practice to deallocate the SQL2 descriptor(s), which would have been allocated at the very beginning of the program. The changes required to the dynamic SQL programs in Figures 18-8, 18-9, and 18-14 to make them conform to the SQL2 standard illustrate, in detail, the new features specified by the standard and the degree to which they differ from common dynamic SQL usage today. In summary, the changes from DB2-style dynamic SQL are: I The SQLDA structure is replaced with a named SQL2 descriptor. I The ALLOCATE DESCRIPTOR and DEALLOCATE DESCRIPTOR statements are used to create and destroy descriptors, replacing allocation and deallocation of host program SQLDA data structures. I Instead of directly manipulating elements of the SQLDA, the program specifies parameter values and information through the SET DESCRIPTOR statement. I Instead of directly manipulating elements of the SQLDA, the program obtains information about query results and obtains the query result data itself through the GET DESCRIPTOR statement.

18:

Dynamic SQL *

I The DESCRIBE statement is used both to obtain descriptions of query results (DESCRIBE OUTPUT) and to obtain descriptions of parameters (DESCRIBE INPUT). I The EXECUTE, OPEN, and FETCH statements are slightly modified to specify the SQL2 descriptor by name instead of the SQLDA.

d. Can be viewed with SQL by selecting it from the plan table e. Is created using the CREATE PLAN statement 15. An execution plan in Microsoft SQL Server a. Requires the use of a plan table b. Can be displayed using an option in SQL Query Analyzer c. Displays the execution plan in a text format d. Displays the execution plan in a graphical format e. Can be viewed with SQL by selecting it from the plan table 16. When tuning INSERT statements, one should consider a. Index maintenance b. Row expansion c. The CASCADE option d. Adequate free space e. Query rewrites 17. When tuning UPDATE statements, one should consider a. Index maintenance b. Row expansion c. The CASCADE option d. Adequate free space e. Query rewrites 18. When tuning DELETE statements, one should consider a. Index maintenance b. Row expansion c. The CASCADE option

Summary

This chapter described dynamic SQL, an advanced form of embedded SQL. Dynamic SQL is rarely needed to write simple data processing applications, but it is crucial for building general-purpose database front-ends. Static SQL and dynamic SQL present a classic trade-off between efficiency and flexibility, which can be summarized as follows: I Simplicity. Static SQL is relatively simple; even its most complex feature, cursors, can be easily understood in terms of familiar file input/output concepts. Dynamic SQL is complex, requiring dynamic statement generation, variable-length data structures, and memory management, with memory allocation/deallocation, data type alignment, pointer management, and associated issues. I Performance. Static SQL is compiled into an application plan at compile-time; dynamic SQL must be compiled at runtime. As a result, static SQL performance is generally much better than that of dynamic SQL. The performance of dynamic SQL is dramatically impacted by the quality of the application design; a design that minimizes the amount of compilation overhead can approach static SQL performance. I Flexibility. Dynamic SQL allows a program to decide at runtime which specific SQL statements it will execute. Static SQL requires that all SQL statements be coded in advance, when the program is written, limiting the flexibility of the program. Dynamic SQL uses a set of extended embedded SQL statements to support its dynamic features: I The EXECUTE IMMEDIATE statement passes the text of a dynamic SQL statement to the DBMS, which executes it immediately. I The PREPARE statement passes the text of a dynamic SQL statement to the DBMS, which compiles it into an application plan but does not execute it. The dynamic statement may include parameter markers whose values are specified when the statement is executed.