By Portfolio T.
This spouse e-book to the Programmer s advisor to the Oracle Precompilers exhibits you ways to jot down FORTRAN courses that use the robust database language SQL to entry and manage Oracle info. It presents easy-to-follow examples, directions, and programming suggestions, as weii as numerous full-length courses to higher your realizing and display the usefulness of embedded SQL.
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Additional info for Pro FORTRA Supplement to the Oracle Precompilers Guide
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1 – 18 Pro*FORTRAN Supplement to the Oracle Precompilers Guide Host Arrays Host arrays can boost performance by letting you manipulate an entire collection of data items with a single SQL statement. With few exceptions, you can use host arrays wherever scalar host variables are allowed. And, you can associate an indicator array with any host array. Declaring Host Arrays You declare and dimension host arrays in the Declare Section. In the following example, three host arrays are declared, each with an upper dimension bound of 50 (the lower bound defaults to 1): * Restrictions Declare and dimension host arrays.
INTEGER*4 SQLCOD If declared outside the Declare Section, SQLCOD is recognized as a status variable if and only if ASSUME_SQLCODE=YES. When MODE={ORACLE|ANSI13|ANSI14}, declarations of the SQLCOD variable are ignored. Access to a local SQLCOD is limited by its scope within your program. After every SQL operation, Oracle returns a status code to the SQLCOD currently in scope. So, your program can learn the outcome of the most recent SQL operation by checking SQLCOD explicitly, or implicitly with the WHENEVER statement.
For example: EXEC SQL BEGIN DECLARE SECTION ... SQLCURSOR CURVAR ... EXEC SQL END DECLARE SECTION A SQLCURSOR variable is implemented using a FORTRAN INTEGER*4 array in the code that Pro*FORTRAN generates. A cursor variable is just like any other Pro*FORTRAN host variable. Writing a Pro*FORTRAN Program 1 – 35 Allocating a Cursor Variable Before you can OPEN or FETCH a cursor variable, you must allocate it using the Pro*FORTRAN ALLOCATE command. For example, to allocate the cursor variable CURVAR that was declared in the previous section, write the following statement: EXEC SQL ALLOCATE :CURVAR Allocating a cursor variable does not require a call to the server, either at precompile time or at run time.
Pro FORTRA Supplement to the Oracle Precompilers Guide by Portfolio T.
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