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Variable-length text data must also be converted before being stored in a host variable. Typically, a DBMS converts VARCHAR data into a null-terminated string for C programs and into a variable-length string (with a leading character count) for Pascal programs. For COBOL and FORTRAN programs, the host variable must generally be declared as a data structure with an integer count field and a character array, or as a fixed-length character variable the same size as the maximum length for the database column. The DBMS returns the actual characters of data in the character array, and it returns the length of the data in the count field of the data structure. If a DBMS supports date/time data or other data types, other conversions are necessary. Some DBMS products return their internal date/time representations into an integer host variable. Others convert the date/time data to text format and return it into a string host variable. Table 17-1 summarized the data type conversions typically provided by DBMS products, but you must consult the embedded SQL documentation for your particular DBMS brand for specific information.

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Part V:

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Like all embedded SQL statements, the singleton SELECT statement sets the values of the SQLCODE and SQLSTATE variables to indicate its completion status: If a single row of query results is successfully retrieved, SQLCODE is set to zero and SQLSTATE is set to 00000; the host variables named in the INTO clause contain the retrieved values. If the query produced an error, SQLCODE is set to a negative value, and SQLSTATE is set to a nonzero error class (the first two characters of the five-digit SQLSTATE string); the host variables do not contain retrieved values. However, the host variables might contain values left over from the last successful execution of a SELECT that references them, so developers must be sure to test SQLCODE or SQLSTATE before referencing the host variables. If the query produced no rows of query results, a special NOT FOUND warning value is returned in SQLCODE, and SQLSTATE returns a NO DATA error class. If the query produced more than one row of query results, it is treated as an error, and a negative SQLCODE is returned. The SQL standard specifies the NOT FOUND warning condition, but it does not specify a particular value to be returned. DB2 uses the value +100, and most other SQL products follow this convention, including the other IBM SQL products, Ingres, and SQLBase. This value is also specified in the SQL standard, but as noted previously, the standard strongly encourages the use of the newer SQLSTATE error variable instead of the older SQLCODE values.

Figure 18-8.

If the data to be retrieved from a database may contain NULL values, the singleton SELECT statement must provide a way for the DBMS to communicate the NULL values to the application program. To handle NULL values, embedded SQL uses indicator variables in the INTO clause, just as they are used in the VALUES clause of the INSERT statement and the SET clause of the UPDATE statement. When you specify a host variable in the INTO clause, you can follow it immediately with the name of a companion host indicator variable. Figure 17-21 shows a revised version of the program in Figure 17-20 that uses the indicator variable repquota_ind with the host variable repquota. Because the NAME and SALES columns are declared NOT NULL in the definition of the SALESREPS table, they cannot produce NULL output values, and no indicator variable is needed for those columns. After the SELECT statement has been executed, the value of the indicator variable tells the program how to interpret the returned data: An indicator value of zero means the host variable has been assigned a retrieved value by the DBMS. The application program can use the value of the host variable in its processing. A negative indicator value means the retrieved value was NULL. The value of the host variable is irrelevant and should not be used by the application program. A positive indicator value indicates a warning condition of some kind, such as a rounding error or string truncation.

"Manager", "MANAGER", "Hire Date","HIRE_DATE", "Quota", "QUOTA", "Sales", "SALES", struct sqlda *parmda; struct sqlvar *parmvar; int parmcnt; int empl_num; */ int int */ char inbuf[101]; i; j; /* /* /* /*

The RESTRICT rule for deletes and updates is a "single-level" rule it affects only the parent table in a relationship. The CASCADE rule, on the other hand, can be a "multi-level" rule, as shown in Figure 11-3.

17:

497, 4, 'n', 449, 12, 'n', 481, 8, 'n', 481, 8, 'n'};

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