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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.

The Oracle DESCRIBE statement is used, like the DB2 DESCRIBE statement, to describe the query results of a dynamic query. Like DB2, Oracle returns the descriptions in a SQLDA. The Oracle DESCRIBE statement can also be used to request a description of

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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 relatively stable 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:

18:

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

Dynamic SQL *

Part V:

Here is another example of assertion that might be useful in the sample database: Insure that the total of the orders for any customer does not exceed their credit limit: CREATE ASSERTION credit_orders CHECK (CUSTOMER.CREDIT_LIMIT <= SELECT SUM(ORDERS.AMOUNT) FROM ORDERS WHERE ORDERS.CUST = CUSTOMER.CUST_NUM) As these examples show, a SQL2 assertion is defined by a search condition, which is enclosed in parentheses and follows the keyword CHECK. Every time an attempt is made to modify the contents of the database, through an INSERT or UPDATE or DELETE statement, the search condition is checked against the (proposed) modified database contents. If the search condition remains TRUE, the modification is allowed. If the search condition would become untrue, the DBMS does not carry out the proposed modification, and an error code is returned, indicating an assertion violation. In theory, assertions could cause a very large amount of database processing overhead as they are checked for each statement that might modify the database. In practice, the DBMS will analyze the assertion and determine which tables and columns it involves. Only changes that involve those particular tables or columns will actually trigger the search condition. Nonetheless, assertions should be defined with great care to insure that they impose a reasonable amount of overhead for the benefit they provide.

the named parameters in a dynamically prepared statement. Oracle also returns these parameter descriptions in a SQLDA. This Oracle DESCRIBE statement requests a description of the columns of query results from a previously prepared dynamic query:

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

exec sql describe select list for qrystmt into qry_sqlda;

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

It corresponds to the DB2 statement:

However, you cannot use a host variable in place of a table name or a column reference. The attempted use of the host variables which_table and which_column in these statements is illegal:

exec sql describe qrystmt into qry_sqlda;

exec sql update :which_table set :which_column = 0; exec sql declare cursor cursor7 for select * from :which_table;

The types of constraints that can be specified in SQL2, and the role played by each, can be summarized as follows: The NOT NULL constraint can appear only as a column constraint It prevents the column from being assigned a NULL value A PRIMARY KEY constraint can appear as a column constraint or a table constraint If the primary key consists of a single column, the column constraint may be more convenient If it consists of multiple columns, it should be specified as a table constraint A UNIQUE constraint can appear as a column constraint or a table constraint If the unique values restriction is being enforced for a single column only, the column constraint is the easiest way to specify it.

This Oracle DESCRIBE statement requests a description of the named parameters in a previously prepared dynamic statement. The statement might be a query or some other SQL statement:

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