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The embedded SQL programs in the previous figures don t provide any real interaction between the programming statements and the embedded SQL statements. In most applications, you will want to use the value of one or more program variables in the embedded SQL statements. For example, suppose you wanted to write a program to adjust all sales quotas up or down by some dollar amount. The program should prompt the user for the amount and then use an embedded UPDATE statement to change the QUOTA column in the SALESREPS table. Embedded SQL supports this capability through the use of host variables. A host variable is a program variable declared in the host language (for example, a COBOL or C variable) that is referenced in an embedded SQL statement. To identify the host variable, the variable name is prefixed by a colon (:) when it appears in an embedded SQL statement. The colon allows the precompiler to distinguish easily between host variables and database objects (such as tables or columns) that may have the same name.

In each case, the row is deleted to maintain the database as an accurate model of the real world. The smallest unit of data that can be deleted from a relational database is a single row.

. . . exec sql whenever sqlerror goto error1; exec sql delete from salesreps where quota < 150000; exec sql delete from customers where credit_limit < 20000; exec sql whenever sqlerror continue; exec sql update salesreps set quota = quota * 1.05; exec sql whenever sqlerror goto error2; exec sql insert into salesreps (empl_num, name, quota) values (116, 'Jan Hamilton', 100000.00); . . . error1: printf("SQL DELETE error: %dl\n", sqlca.sqlcode); exit(); error2: printf("SQL INSERT error: %ld\n", sqlca.sqlcode); exit(); . . .

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The DELETE statement, shown in Figure 10-5, removes selected rows of data from a single table. The FROM clause specifies the target table containing the rows. The WHERE clause specifies which rows of the table are to be deleted. Suppose Henry Jacobsen, the new salesperson hired earlier in this chapter, has just decided to leave the company. The DELETE statement that removes his row from the SALESREPS table is shown next. Remove Henry Jacobsen from the database.

Figure 17-16.

16 - The System Catalog - 321

TABLE 16-9

Figure 17-17 shows a C program that implements the quota adjustment application using a host variable. The program prompts the user for the adjustment amount and stores the entered value in the variable named amount. This host variable is referenced

Information Name of constraint (unique, primary key, or foreign key) described by this row Schema containing the constraint Table to which constraint applies Name of column in the constraint Position of column within the constraint (first column = 1)

17:

The SYSCAT.KEYCOLUSE View (DB2)

in the embedded UPDATE statement. Conceptually, when the UPDATE statement is executed, the value of the amount variable is obtained, and that value is substituted for the host variable in the SQL statement. For example, if you enter the amount 500 in response to the prompt, the DBMS effectively executes this UPDATE statement:

16:

exec sql update salesreps set quota = quota + 500;

17 - Embedded SQL - 344 18 - Dynamic SQL* - 387 19 - SQL APIs - 430

You can query the SYSCAT.COLUMNS table to find a table s primary key: List the columns that form the primary key of the PRODUCTS table.

A host variable can appear in an embedded SQL statement wherever a constant can appear. In particular, a host variable can be used in an assignment expression:

SELECT FROM WHERE AND ORDER COLNAME, KEYSEQ, TYPENAME, REMARKS SYSCAT.COLUMNS TABNAME = 'PRODUCTS' KEYSEQ > 0 BY KEYSEQ;

exec sql update salesreps set quota = quota + :amount;

The DB2 catalog support for primary and foreign keys is typical of that found in other major SQL products. The Oracle system ALL_CONSTRAINTS and USER_CONSTRAINTS views, for example, provide the same information as the DB2 SYSCAT.REFERENCES system table. Information about the specific columns that make up a foreign key or primary key appears in the Oracle ALL_CONS_COLUMNS and USER_CONS_COLUMNS system views, which are analogous to the DB2 SYSCAT.KEYCOLUSE system table. Microsoft SQL Server has a similar catalog structure, with foreign key information divided between the SYS. FOREIGN_KEYS and SYS.FOREIGN_KEY_COLUMNS catalog views. Informix Universal Server takes a similar approach to the DB2 catalog, but with the same types of differences previously illustrated in its table information and column information support. Each constraint defined within the database generates one row in the Informix SYSCONSTRAINTS system table, which defines the name of the constraint and its type (check constraint, primary key, referential, and so on). This system table also assigns an internal constraint-id number to identify the constraint within the catalog. The table to which the constraint applies is also identified by table-id (which serves as a foreign key to the SYSTABLES system table). Further information about the referential constraints (foreign keys) is contained in a SYSREFERENCES system table. Again in this table, the constraint, the primary key, and the parent table are identified by internal IDs that link the foreign key information to the SYSCONSTRAINTS and SYSTABLES system tables. The SYSREFERENCES table contains information about the delete rule and update rule that apply to the foreign key relationship and similar information.

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