Sybase 12.4.2 - Manual (Page 98)

How Adaptive Server IQ makes connections
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3 Locate a server. Using the connection parameters, the ODBC driver or
Embedded SQL interface library must locate a database server on your
machine or over a network.
4 Locate the database. Once it locates the server, the ODBC driver or
Embedded SQL interface library must locate the database you are
connecting to.
The following sections describe each of these steps in detail.
Locating the interface library
The client application makes a call to one of the Adaptive Server IQ interface
libraries. In general, the location of this DLL or shared library is transparent to
the user. Here we describe how the library is located, in case of problems.
ODBC driver location For ODBC, the interface library is also called an ODBC driver. An ODBC
client application calls the ODBC driver manager, and the driver manager
locates Adaptive Server IQ’s driver.
The ODBC driver manager looks in the supplied data source in the odbc.ini file
or registry to locate the driver. When you create a data source using the ODBC
Administrator, Adaptive Server IQ fills in the current location for your ODBC
driver.
Embedded SQL
interface library
location Embedded SQL applications call the interface library by name. The name of
the Adaptive Server IQ Embedded SQL interface library is as follows:
• Windows NT: dblib6t.dll
• UNIX: dblib6 with an operating system-specific extension.
The locations that are searched depend on the operating system:
• On Windows NT, the client application looks for files in the current
directory, in the system path, and in the Windows and Windows\system
directories.
• On UNIX, the client application looks for files in the system path and the
user path.
When the library is
located Once it locates the interface library, the client application passes a connection
string to it. The interface library uses the connection string to assemble a list of
connection parameters, which it uses to establish a connection to a server.