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In addition to its role as an interactive database language, SQL is used for programmatic access to relational databases: I The most common technique for programmatic use of SQL is embedded SQL, where SQL statements are embedded into the application program, intermixed with the statements of a host programming language such as C or COBOL. I Embedded SQL statements are processed by a special SQL precompiler. They begin with a special introducer (usually EXEC SQL) and end with a terminator, which varies from one host language to another. I Variables from the application program, called host variables, can be used in embedded SQL statements wherever a constant can appear. These input host variables tailor the embedded SQL statement to the particular situation. I Host variables are also used to receive the results of database queries. The values of these output host variables can then be processed by the application program. I Queries that produce a single row of data are handled with the singleton SELECT statement of embedded SQL, which specifies both the query and the host variables to receive the retrieved data. I Queries that produce multiple rows of query results are handled with cursors in embedded SQL. The DECLARE CURSOR statement defines the query, the OPEN statement begins query processing, the FETCH statement retrieves successive rows of query results, and the CLOSE statement ends query processing. I The positioned UPDATE and DELETE statements can be used to update or delete the row currently selected by a cursor.

. . . 01 PRINT_MESSAGE. 02 FILLER PIC X(11) VALUE 'SQL error:'. 02 PRINT-CODE PIC SZ(9). . . . EXEC SQL DELETE FROM SALESREPS WHERE QUOTA < 150000 END EXEC. IF SQLCODE NOT = ZERO GOTO ERROR-ROUTINE. . . . ERROR-ROUTINE. MOVE SQLCODE TO PRINT-CODE. DISPLAY PRINT_MESSAGE. . . .

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Part V:

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error conditions Further, because of the significant differences among SQL implementations permitted by the SQL1 standard, considerable differences in the errors could occur from one implementation to another Finally, the definition of the SQLCA varied in significant ways from one DBMS brand to another, and all of the major brands had a large installed base of applications that would be broken by any change to their SQLCA structure Instead of tackling the impossible task of getting all of the DBMS vendors to agree to change their SQLCODE values to some standard, the writers of the SQL standard took a different approach They included the SQLCODE error value, but identified it as a deprecated feature, meaning that it was considered obsolete and would be removed from the standard at some future time To take its place, they introduced a new error variable, called SQLSTATE.

Dynamic SQL *

The SET DEFAULT delete rule tells the DBMS that when a parent row is deleted, the foreign key values in all of its child rows should automatically be set to the default value for that particular column Deletions from the parent table thus cause a "set to DEFAULT" update on selected columns of the child table For the tables in Figure 11-1, this rule can be summarized as "If an office is deleted, indicate that the current office assignment of its salespeople is the default office specified in the definition of the SALESREPS table" There are some slight differences between the SQL2 and DB2 implementations of the delete rules The current DB2 implementation does not support the SET DEFAULT rule; it is only specified by the SQL2 standard The SQL2 standard actually calls the previously described RESTRICT rule, NO ACTION The SQL2 naming is somewhat confusing.

The standard also specifies, in detail, the error conditions that can be reported through the SQLSTATE variable, and the error code assigned to each error To conform to the SQL standard, a SQL product must report errors using both the SQLCODE and SQLSTATE error variables In this way, existing programs that use SQLCODE will still function, but new programs can be written to use the standardized SQLSTATE error codes The SQLSTATE variable consists of two parts: A two-character error class that identifies the general classification of the error (such as a connection error, an invalid data error, or a warning) A three-character error subclass that identifies a specific type of error within a general error class For example, within the invalid data class, the error subclass might identify a divide-by-zero error, an invalid numeric value error, or an invalid datetime data error.

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