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how to use code 39 barcode font in crystal reports

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Examples of the first three types of constraints have previously appeared in earlier sections of this chapter. An assertion is specified using the SQL2 CREATE ASSERTION statement. Here is an assertion that might be useful in the demo database: Insure that an office's quota target does not exceed the sum of the quotas for its salespeople: CREATE ASSERTION quota_valid CHECK ((OFFICES.QUOTA <= SUM(SALESREPS.QUOTA)) AND (SALESREPS.REP_OFFICE = OFFICES.OFFICE)) Because it is an object in the database (like a table or a column), the assertion must be given a name (in this case, it's "quota_valid"). The name is used in error messages produced by the DBMS when the assertion is violated. The assertion causing an error may be obvious in a small demo database, but in a large database that might contain dozens or hundreds of assertions, it's critical to know which of the assertions was violated.

The Oracle DBMS preceded DB2 into the market and based its dynamic SQL support on IBM s System/R prototype. For this reason, the Oracle support for dynamic SQL differs somewhat from the IBM SQL standard. Although Oracle and DB2 are broadly compatible, they differ substantially at the detail level. These differences include Oracle s use of parameter markers, its use of the SQLDA, the format of its SQLDA, and its support for data type conversion. The Oracle differences from DB2 are similar to those you may encounter in other DBMS brands. For that reason, it is instructive to briefly examine Oracle s dynamic SQL support and its points of difference from DB2.

Part V:

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Recall that DB2 does not allow host variable references in a dynamically prepared statement. Instead, parameters in the statement are identified by question marks (parameter markers), and values for the parameters are specified in the EXECUTE or OPEN statement. Oracle allows you to specify parameters in a dynamically prepared statement using the syntax for host variables. For example, this sequence of embedded SQL statements is legal for Oracle:

Summary

exec sql begin declare section; char stmtbuf[1001]; int employee_number; exec sql end declare section; . . . strcpy(stmtbuf, "delete from salesreps where empl_num = :rep_number;"); exec sql prepare delstmt from :stmtbuf; exec sql execute delstmt using :employee_number;

In addition to its role as an interactive database language, SQL is used for programmatic access to relational databases: 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. 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. 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. 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. 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. 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. For applications that need to move through the cursor results in a nonsequential manner, a scrollable cursor can be used (if supported by the DBMS product). The positioned UPDATE and DELETE statements can be used to update or delete the row currently selected by a cursor.

Dynamic SQL*

Although rep_number appears to be a host variable in the dynamic DELETE statement, it is in fact a named parameter. As shown in the example, the named parameter behaves exactly like the parameter markers in DB2. A value for the parameter is supplied from a real host variable in the EXECUTE statement. Named parameters are a real convenience when you use dynamic statements with a variable number of parameters.

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