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<IMG SRC="unixODBC.gif" NAME="graphics1" ALIGN=BOTTOM WIDTH=32 HEIGHT=32 BORDER=0>unixODBC

<HR>
USER
MANUAL
 

Welcome to the unixODBC User
Manual.&nbsp; This manual is targeted toward people who will be using
unixODBC to access data sources from tools and applications which
have been developed by others. This manual compliments the
<A HREF="../AdministratorManual">Administrator Manual</A> and the
<A HREF="../ProgrammerManual">Programmer Manual</A>, each of which is
geared for a more technical audience. 

Getting Started

At this point unixODBC has been
installed by your System Administrator. Your System Administrator
should have installed and registered at least one ODBC Driver (we
will assume that the ODBC Text File Driver has been installed). Your
System Administrator accomplished this by following the directions
laid out in the Administrator Manual. 

You will need an account on the
UNIX/Linux machine; this is also provided by your System
Administrator. In fact, if you run into problems at any point in this
manual then you should refer to your System Administrator to ensure
that all required software is installed, accounts given and
privileges granted. You may also want to talk to your Database
Administrator (DBA) to ensure that you have access to your database
and to resolve any questions about which driver to use and what
options to set. 

UNIX users can be given a wide
variety of methods to access their account resources and these access
methods usually fall into one of two categories. 

1. shell account (telnet and
terminal sessions) 2.
graphical desktop 

If you are limited to a shell
account then you will not be able to use the ODBCConfig and the
DataManager tools. 

We are now ready to start using the
unixODBC tools. The first thing you should do is verify that you have
a working System DSN. If you do not; then you should create a User
DSN. These tasks can be accomplished using the ODBCConfig tool.

Using ODBCConfig

The ODBCConfig tool is designed to
allow you to easily setup a Data Source (DSN). DSN's act as an access
point for getting to your data. In many cases; creating a DSN is as
simple as picking a Driver to use, selecting a Server, and entering a
Name for the DSN. In fact; DSN stands for Data Source Name. 

You should find using the ODBCConfig
tool to be quite intuitive because of the simple Graphical User
Interface (see Figure 1) but you must understand a few terms before
getting started. &nbsp; 

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				Figure 1
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User DSN 

These are your personal Data
Sources. You are able to; Add new ones, Remove existing ones, and
Configure existing ones. User DSN information is stored in a secret
location where only you can access them. Keeping your User DSN's
separate from other User DSN's allows you a great deal of flexibility
and control over creating and working with Data Sources which are
only important to you. 

System DSN 

These are created by the System
Administrator. They act very much like the User DSN's but with three
important differences. 

1. ONLY the System Administrator
can; Add, Remove and Configure System DSN's. 2.
System DSN's will be used only if the DSN does not exist as a User
DSN. In other words; your User DSN has precedence over the System
DSN. 3. Everyone, logged
into the ODBC enabled computer, shares the same list of System DSN's.

Drivers 

Drivers contain the special code
required to talk to the specific type of database you will work with.
The Drivers often come from the vendor of the database but may also
be found in the unixODBC package. Your System Administrator is the
only user who can install and register a Driver. You will select a
Driver to use when adding a new DSN. 

Add a DSN 

You will want to ensure that you
have at least one working DSN. Here is a quick step-by-step guide to
creating your first User DSN. We will not actually use it yet because
that will involve using other tools and we have not talked about them
yet. 

1. Execute ODBCConfig 

This can be done in a variety of
ways. If you know that you have an icon or menu item for ODBCConfig
on your desktop then execute it using one of these methods. If you do
not; then start a shell and enter the command ODBCConfig.
You should see a window popup (see Figure 1). 

2. Add

Click on the
User DSN tab to ensure that you are working with User DSNs. Click on
the Add button. Select a Driver from the list. If the list is empty
then contact your System Administrator; only the System Administrator
can add Drivers. For this example we will try to use the Text File
Driver. Select the Text File Driver if you have it available.

3. Edit
Options 

You should be
presented with a list of DSN options which you can edit.&nbsp; Figure
2 shows the options for the Text File Driver but you may have a
different set of options if you selected a different driver. Common
options are; Name (a unique name must be entered). Description, Trace
and TraceFile. &nbsp; &nbsp; 

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				Figure 2
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Enter a unique
name, enter a comment, turn Trace off and click Ok to save it. You
may click on Configure, at the main window, to come back to these
options at any time in the future. Notice that the Database in
Figure-2 is /home/pharvey/test.db. You should ensure that this points
to something like; /home/YourLoginID/test.db where you replace
YourLoginID with your ID. The test.db file should not already exist
(for the purposes of this excercise); it will be created for you.
This is how to create a new database using the ODBC Text File Driver.

4. Your Done

Notice that
you now have your new DSN listed in the main form. This means that
you can try to use it in any tool or application which uses ODBC DSNs
for data access. This includes many applications such as Word
Processors and Spread Sheets. You may want to test your DSN using the
DataManager. 

Summary

ODBCConfig is
a useful tool for PowerUsers but it is simple enough for almost any
user to use. ODBCConfig exposes the most important reason for using
ODBC to access your data; the ability for you or your System
Administrator to change the Data Source for your tools and
applications. Please take some time to get familiar with ODBCConfig
and your Driver options, perhaps sit with someone who is a bit more
technical and talk about it for one or two minutes. You will be
rewarded. 

Using DataManager

The DataManager is a great,
graphical, tool for exploring your Data Sources. It allows you to
explore you Data Sources in a similar manner to exploring your file
system. The DataManager ( see Figure 6 ) is split into two views. On
the left hand side you have a Tree View'. The Tree View is where you
can drill down to the information that interests you. On the right
hand side you have a Detail View. The Detail View shows any details
that may be available for the selected item in the Tree View. 

Just like ODBCConfig, you can
execute the DataManager in a variety of ways. One way is to go to a
shell and enter the command DataManager.
This should bring up a window that looks similar to Figure 6.
 &nbsp; 

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				Figure 6
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</CENTER>
Next; expand the nodes to drill down
to the information that interests you. You will be asked to login if
you try to drill past a Data Source. If this happens, enter the login
ID and Password provided by your Database Administrator or System
Administrator. You will know that you are logged in when the little
computer screen changes from Red to Green. 

One of the interesting Detail Views
occurs when you select a Data Source item in the Tree View when you
are logged into it (the little computer screen is Green). The Detail
View is an SQL editor. This is only useful if you know the SQL
command language but for those that do... it can be very handy.

Summary 

The DataManager tool is a good way
to test a DSN and then to see what resources are available inside the
Data Source. It is also very easy to use. &nbsp; 

Using isql

This is a command line tool. This
means that you can use it even if you are not working on a Graphical
Desktop (for example; in a telnet session). This tool is designed for
more advanced uses of unixODBC. You can use isql to test a connection
but it is designed to be used by those experienced with the
Structured Query Language (SQL). You probably will not want to use
this tool if you are unfamiliar with SQL. 

isql allows you to; 

1. connect to your Data Source
(using a DSN) 2. send SQL
commands to the Data Source 3.
receive results from the Data Source 

This tool can act in batch mode or
interactive mode. Figure 3 shows a simple, interactive, session.
 &nbsp; &nbsp; 

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				Figure 3
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Figure 4 shows an example of isql
being used in batch mode. Notice that it is being told to run a
similar query as above but this time it is coming from a file (
My.sql ). &nbsp; &nbsp; 

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				Figure 4
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</CENTER>
The example, in Figure 4, is also
formatting the results into an HTML table and is sending them to a
new file ( My.html ). Figure 5 shows the resulting html table.
 &nbsp; 

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	<TABLE WIDTH=679 BORDER=1 CELLPADDING=2 CELLSPACING=3 FRAME=VOID RULES=COLS>
		<COL WIDTH=0>
		<COL WIDTH=118>
		<COL WIDTH=118>
		<COL WIDTH=104>
		<COL WIDTH=136>
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			</TR>
			<TR>
				<TD ROWSPAN=4 WIDTH=0 VALIGN=TOP></TD>
				<TD WIDTH=118 BGCOLOR="#000099">
					vcCompanyName
				</TD>
				<TD WIDTH=118 BGCOLOR="#000099">
					vcCompanyStreet
				</TD>
				<TD WIDTH=104 BGCOLOR="#000099">
					vcCompanyCity
				</TD>
				<TD WIDTH=136 BGCOLOR="#000099">
					vcCompanyProvince
				</TD>
				<TD WIDTH=158 BGCOLOR="#000099">
					vcCompanyPostalCode
				</TD>
				<TD ROWSPAN=4 WIDTH=0 VALIGN=TOP></TD>
			</TR>
		</TBODY>
		<TBODY>
			<TR>
				<TD WIDTH=118>
					XYZ Company
				</TD>
				<TD WIDTH=118>
					XYZ Street
				</TD>
				<TD WIDTH=104>
					 
					
				</TD>
				<TD WIDTH=136>
					 
					
				</TD>
				<TD WIDTH=158>
					 
					
				</TD>
			</TR>
		</TBODY>
		<TBODY>
			<TR>
				<TD WIDTH=118>
					Another Company
				</TD>
				<TD WIDTH=118>
					 
					
				</TD>
				<TD WIDTH=104>
					 
					
				</TD>
				<TD WIDTH=136>
					 
					
				</TD>
				<TD WIDTH=158>
					 
					
				</TD>
			</TR>
		</TBODY>
		<TBODY>
			<TR>
				<TD WIDTH=118>
					CodeByDesign
				</TD>
				<TD WIDTH=118>
					 
					
				</TD>
				<TD WIDTH=104>
					 
					
				</TD>
				<TD WIDTH=136>
					 
					
				</TD>
				<TD WIDTH=158>
					 
					
				</TD>
			</TR>
			<TR>
				<TD COLSPAN=7 WIDTH=669></TD>
			</TR>
			<TR>
				<TD COLSPAN=7 WIDTH=669>
					Figure 5
				</TD>
			</TR>
		</TBODY>
	</TABLE>
</CENTER>
Summary 

isql is a powerful tool for working
SQL to access your Data Source but it is more for the advanced user.

StarOffice 5

StarOffice is an application similar
in goals to MS Office. A free version, for non-commercial use, can be
downloaded from <A HREF="http://www.stardivision.com/">StarDivisions
web site</A>. Figure 7 shows a PostgreSQL table being browsed in
StarOffice. StarOffice can use ODBC data but it can be tricky to get
going. Here are some things to note about using StarOffice with
unixODBC. Make sure that unixODBC is installed on your machine before
trying to use StarOffice ODBC on UNIX. &nbsp; 

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				Figure 7
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Q. StarOffice disappears when I try
to load a list of ODBC DSNs and I get an error in my terminal window
about some library file missing? 

A. If you have StarOffice 5.0 you may want to try adding this to
your soffice start script export
LD_PRELOAD=/usr/lib/libodbc.so&nbsp; Your soffice start
script can be found in Office50/bin/sofficeand can be
edited with any text editor. If you are not sure of where libodbc.so
is or where soffice is then you may want to use the UNIX find
command. 

However with the release of StarOffice 5.1 and beyond all you need
to do is to add the path to the libodbc.so to either /etc/ld.so.conf
or to your LD_LIBRARY_PATH environment variable. 

Q. Do all ODBC drivers work with StarOffice? 

A. No. StarOffice is very demanding upon an ODBC driver.
StarOffice needs many ODBC features in order to accept a driver. Two
drivers which are known to work are; 1. PostgreSQL and 2. MySQL.
People are actively working on other drivers. 

Summary 

StarOffice is a rising 'star' in the
UNIX world. You can combine StarOffice with unixODBC to get at your
data. With StarOffice and unixODBC you can pull your data into a
Spreadsheet, Word Processor or even create Web forms based upon your
data. 

Conclusion

unixODBC comes with a variety of
useful and powerful tools to allow you to configure you ODBC access
and to work with your ODBC data. Familiarity with these tools is a
great start to using your ODBC in applications such as word
processors, spreadsheets and even applications developed at your
company of employ. I hope you enjoy them! Please email comments
and/or suggestions to me, <A HREF="mailto:pharvey@codebydesign.com">Peter
Harvey</A>. 

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