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What is the relationship of "tier" when referring to ODBC?

What is the relationship of "tier" when referring to ODBC?

Technically, an application can use JDBC to connect directly to a database server, or it can use an "intermediary" in-between. These are the commonly used JDBC configurations:

2 Tier: Application loads a JDBC driver and connects to the database (no intermediary)

3 Tier: The application communicates with an intermediary (a Servlet, a JSP, an EJB, or a CORBA service). The intermediary uses JDBC (or embedded SQL statements) to connect to the database

1 Tier: That's a special case: The application and the database all run in the *same JVM*. That's interesting only if you develop embedded applications or a server product (e.g., a JMS server).


This was first published in March 2002

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