Ensuring backward compatibility, PL-SQL Programming

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Ensuring Backward Compatibility 

The PL/SQL Version 2 permits some abnormal behavior which Version 8 disallows.

Particularly, Version 2 permits you to

(i) Make the forward references to RECORD and TABLE types when declaring the variables.

(ii) Specify the name of the variable (not a datatype) in the RETURN clause of the function specification.

(iii) Assign values to the elements of an index-by table IN parameter.

(iv) Pass the fields of a record IN parameter to the other subprogram as OUT parameters

(v) Use the fields of a record OUT parameter on the right-hand side of the assignment statement.

(vi) Use the OUT parameters in the FROM list of a SELECT statement.

For backward compatibility, you might want to remain this particular Version 2 behavior. You can do it by setting the PLSQL_V2_COMPATIBILITY flag. At server side, you can set the flag in 2 ways:

(i) Add the line below to the Oracle initialization file:

PLSQL_V2_COMPATIBILITY=TRUE

(ii)Execute one of the SQL statements below:

ALTER SESSION SET PLSQL_V2_COMPATIBILITY = TRUE;

ALTER SYSTEM SET PLSQL_V2_COMPATIBILITY = TRUE;


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