56 lines
2.2 KiB
TeX
56 lines
2.2 KiB
TeX
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%&latex -*- latex -*-
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\chapter{Open Database Base Connectivity Interface (ODBC)}
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ODBC is an standarized API for talking to database drivers, thus
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enabling your application to use any ODBC compliant database driver to
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connect to SQL databases. The Scheme Shell provides access to almost
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all functions and data structures of ODBC.
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The ODBC API was designed by Microsoft Corporation and has been
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updated several times. At the time of writing, ODBC API version 3.5
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was current. However, the scsh also provides access to all functions
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needed to use an ODBC driver manager starting from version 1.0.
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\section{ODBC Overview}
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An ODBC setup consists of several components which arrange around a so
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called ODBC driver manager. The driver manager provides an abstract
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implementation of the ODBC API for accessing databases. The concrete
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implementation, which contains e.g. contains the code to connect to a
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certain SQL database depends on the database to access. Therefore,
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this codes resides in a ODBC driver, which is usually part of the SQL
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database distribution. In some cases ODBC driver managers bring along
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their own drivers.
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The \textit{Data Source Name}, DSN for short, associates credentials
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needed to logon a certain database with a the apropriate driver to
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access that database. If an application wishes to connect to a DSN
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the driver manager loads the ##angegeben## driver and routes all
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functions call by the application via this driver to the database.
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The are at least two implementation of ODBC driver managers for UNIX
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systems: unixODBC~\cite{BlaBla} and iODBC~\cite{BlaBla}. The Scheme
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shell can use both ODBC driver managers. However, you have to decide
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during compilation of scsh which one to use.
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Support for ODBC at this time is quite low-level---for alsmost each
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function or data structure in the ODBC API there is a function call in
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Scheme. This chapter describes how to call the API functions from
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Scheme, but does not cover the ##funktionsweise## of the underlying
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ODBC function call in detail. Microsoft's ODBC API reference
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manual~\cite{BlaBla} explains all API functions in great detail.
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\section{ODBC Data Types}
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%%% handles
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\section{ODBC functions and constants}
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\section{Error handling}
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\section{Restrictions}
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