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he embedded SQL programming features described in 17 are collectively known as static SQL. Static SQL is adequate for writing all of the programs typically required in a data processing application. For example, in the order-processing application of the sample database, you can use static SQL to write programs that handle order entry, order updates, order inquiries, customer inquiries, customer file maintenance, and programs that produce all types of reports. In every one of these programs, the pattern of database access is decided by the programmer and hard-coded into the program as a series of embedded SQL statements. There is an important class of applications, however, where the pattern of database access cannot be determined in advance. A graphic query tool or a report writer, for example, must be able to decide at runtime which SQL statements it will use to access the database. A personal computer spreadsheet that supports host database access must also be able to send a query to the host DBMS for execution on the fly. These programs and other general-purpose database front-ends cannot be written using static SQL techniques. They require an advanced form of embedded SQL, called dynamic SQL, described in this chapter.

Errors specified in the SQL standard have an error class code that begins with a digit from zero to four (inclusive) or a letter between A and H (inclusive) For example, data errors are indicated by error class 22 A violation of an integrity constraint (such as a foreign key definition) is indicated by error class 23 A transaction rollback is indicated by error class 40 Within each error class, the standard subclass codes also follow the same initial number/ letter restrictions For example, within error class 40 (transaction rollback), the subclass codes are 001 for serialization failure (that is, your program was chosen as the loser in a deadlock), 002 for an integrity constraint violation, and 003 for errors where the completion status of the SQL statement is unknown (for example, when a network connection breaks or a server crashes before the statement completes).

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As the name static SQL implies, a program built using the embedded SQL features described in 17 (host variables, cursors, and the DECLARE CURSOR, OPEN, FETCH, and CLOSE statements) has a predetermined, fixed pattern of database access. For each embedded SQL statement in the program, the tables and columns referenced by that statement are determined in advance by the programmer and hard-coded into the embedded SQL statement. Input host variables provide some flexibility in static SQL, but they don t fundamentally alter its static nature. Recall that a host variable can appear anywhere a constant is allowed in a SQL statement. You can use a host variable to alter a search condition:

Figure 17-12 shows the same C program as Figure 17-10, but uses the SQLSTATE variable for error checking instead of SQLCODE The standard specifically reserves error class codes that begin with digits from five to nine (inclusive) and letters between I and Z (inclusive) as implementation-specific errors that are not standardized While this allows differences among DBMS brands to continue, all of the most common errors caused by SQL statements are included in the standardized error class codes As commercial DBMS implementations move to support the SQLSTATE variable, one of the most troublesome incompatibilities between different SQL products is gradually being eliminated The SQL standard provides additional error and diagnostics information through a new GET DIAGNOSTICS statement, shown in Figure 17-13.

exec sql select name, quota, sales from salesreps where quota > :cutoff_amount;

The statement allows an embedded SQL program to retrieve one or more items of information about the SQL statement just executed, or about an error condition that was just raised Support for the GET DIAGNOSTICS statement is required for Intermediate SQL or Full SQL conformance to the.

It means "if you try to delete a parent row that still has children, the DBMS will take no action on the row" The DBMS will, however, generate an error code Intuitively, the DB2 name for the rule, "restrict," seems a better description of the situation the DBMS will restrict the DELETE operation from taking place and generate an error code The latest release of DB2 supports both a RESTRICT and a NO ACTION delete rule The difference between them is the timing of the enforcement of the rule The RESTRICT rule is enforced before any other constraints; the NO ACTION rule is enforced after other referential constraints Under almost all circumstances, the two rules operate identically.

You can also use a host variable to change the data inserted or updated in a database:

17:

exec sql update salesreps set quota = quota + :increase where quota >:cutoff_amount;

. . . exec sql delete from salesreps where quota < 150000; if (strcmp(sqlca.sqlstate,"00000")) goto error_routine; . . . error_routine: printf("SQL error: %s\n",sqlca.sqlstate); exit(); . . .

18:

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