3. External access to the DBMS
Using these different access modes, external actors interact with the DB. They access it either directly in SQL language (data definition, manipulation, interrogation and control), or through a host language (Java, C, C++, C#, Php, etc.). It should be noted that the declarative SQL language (standardized) has been extended by procedural languages, generally imperative and proprietary (PL/SQL for Oracle, Transact-SQL for MS SQL Server...).
3.1 Application architectures
The end-user has an application with which he interacts through presentation artifacts (presentation logic). The application manipulates data through processing (application logic). These three layers can be split between client and server in several ways, as illustrated in figure
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External access to the DBMS
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