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An Oracle database cannot determine the work done by a packaged function when the function is executed from inside a DML statement. Therefore, if packaged functions are to be executed from within a DML statement, developers must use aPRAGMA to define a purity level for functions defined as part of the package spec. A PRAGMA is a compiler directive that instructs the compiler to handle code in a specific manner. To define a purity level for a packaged function, the PRAGMA RESTRICT_REFERENCES is used.A purity level defined within a package spec instructs Oracle about the kinds of operations that the function performs. Table 6.1 lists the four purity levels that can be defined for a function. Table 6.1 Purity levels for packaged functions. | Purity Level | Meaning | WNDS | The function doesn’t alter the contents of any database table. | RNDS | The function doesn’t read the contents of any database table. | WNPS | The function doesn’t alter any variables within another package. | RNPS | The function doesn’t read any variables within another package. |
Listing 6.5 illustrates how the purity level of a function is defined within a package spec.Listing 6.5 Defining the purity level of a packaged function. PACKAGE System_Errors IS TYPE MessageParts_type IS TABLE OF varchar2 (20) INDEX BY binary_integer; vLastError varchar2 (100); THIS_PACKAGE CONSTANT varchar2 (13) := 'System_Errors'; xUNHANDLED_ERROR EXCEPTION; FUNCTION Build_Message (vObjectName IN varchar2, iErrorCode IN integer, vErrorString IN varchar2)…...

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