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PHP Database ODBC
Posted by jujur
on
5:42 AM
PHP Database ODBC
ODBC is an Application Programming
Interface (API) that allows you to connect to a data source (e.g. an MS Access
database).
Create an ODBC Connection
With an ODBC connection, you can
connect to any database, on any computer in your network, as long as an ODBC
connection is available.Here is how to create an ODBC connection to a MS Access Database:
1. Open the
Administrative Tools icon in your Control Panel.
2. Double-click
on the Data Sources (ODBC) icon inside.
3. Choose
the System DSN tab.
4. Click on
Add in the System DSN tab.
5. Select
the Microsoft Access Driver. Click Finish.
6. In the
next screen, click Select to locate the database.
7. Give the
database a Data Source Name (DSN).
8. Click OK.
Note that this configuration has
to be done on the computer where your web site is located. If you are running
Internet Information Server (IIS) on your own computer, the instructions above
will work, but if your web site is located on a remote server, you have to have
physical access to that server, or ask your web host to to set up a DSN for you
to use.
Connecting to an ODBC
The odbc_connect() function is
used to connect to an ODBC data source. The function takes four parameters: the
data source name, username, password, and an optional cursor type.The odbc_exec() function is used to execute an SQL statement.
Example
The following example creates a
connection to a DSN called northwind, with no username and no password. It then
creates an SQL and executes it:$conn=odbc_connect('northwind','','');
$sql="SELECT * FROM customers";
$rs=odbc_exec($conn,$sql);
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Retrieving Records
The odbc_fetch_rows() function is
used to return records from the result-set. This function returns true if it is
able to return rows, otherwise false.The function takes two parameters: the ODBC result identifier and an optional row number:
odbc_fetch_row($rs)
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Retrieving Fields from a Record
The odbc_result() function is used
to read fields from a record. This function takes two parameters: the ODBC
result identifier and a field number or name.The code line below returns the value of the first field from the record:
$compname=odbc_result($rs,1);
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$compname=odbc_result($rs,"CompanyName");
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Closing an ODBC Connection
The odbc_close() function is used
to close an ODBC connection.odbc_close($conn);
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An ODBC Example
The following example shows how to
first create a database connection, then a result-set, and then display the
data in an HTML table.<html>
<body>
<?php
$conn=odbc_connect('northwind','','');
if (!$conn)
{exit("Connection Failed: " . $conn);}
$sql="SELECT * FROM customers";
$rs=odbc_exec($conn,$sql);
if (!$rs)
{exit("Error in SQL");}
echo "<table><tr>";
echo "<th>Companyname</th>";
echo "<th>Contactname</th></tr>";
while (odbc_fetch_row($rs))
{
$compname=odbc_result($rs,"CompanyName");
$conname=odbc_result($rs,"ContactName");
echo "<tr><td>$compname</td>";
echo "<td>$conname</td></tr>";
}
odbc_close($conn);
echo "</table>";
?>
</body>
</html>
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