Use the NCHR(n) SQL function. The NCHR(n) SQL function returns a unit of character code in the national character set, which is AL16UTF16 or UTF8. The result of concatenating several NCHR(n) functions is NVARCHAR2 this way, you can bypass the client and server character set conversions and create an NVARCHAR2 string directly. For example, NCHR(32) represents a blank character.
To enable or disable the secure application role, you create the role's security policies within a PL/SQL package. You also can create an individual function or procedure to handle this, but a package lets you group a set of functions or procedure together. The package defines a simple, clear, interface to a set of related procedures and types that can be accessed by SQL statements. Packages also make code more reusable and maintainable. The advantage here for secure application roles is that you can create a group of security policies that, used together, present a solid security strategy designed to protect your users (or potential intruders) who fail the security policies, you can build in auditing checks to record the failure.
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