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Connecting to Database

Connecting to Database. 21 Feb 2011. Database Options. Can use many different databases in conjunction with php. MySql; MS Access; Oracle; etc etc Most commonly used with php is MySql Open source Huge support in terms of online forums, tutorials, documentation and so on. Database Options.

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Connecting to Database

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  1. Connecting to Database 21 Feb 2011

  2. Database Options • Can use many different databases in conjunction with php. • MySql; MS Access; Oracle; etc etc • Most commonly used with php is MySql • Open source • Huge support in terms of online forums, tutorials, documentation and so on

  3. Database Options • We will be using MS Access • Much of the material can be tweaked to suit connecting to MySql database. • As per usual a good resource is w3schools.com

  4. Create ADO connection • To connect to MS Access we need to create an instance of the ActiveX Data Object (ADO) • ADO are part of the component object model (COM) objects for accessing data sources //create an instance of the ADO connection object $conn = new COM('ADODB.Connection') or die('Cannot start ADO');

  5. Connection String • Create a connection string = Holds the database driver details and location of dB //define connection string variable to hold database driver details and location of dB //Make sure to change this to location of your DB $connStr = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:/inetpub/wwwroot/mbsebus/ASugrue/databases/dbtotal.accdb;Persist Security Info=False;"; // If using old access format .mdb the following connection string appropriate: $connStr = "PROVIDER=Microsoft.Jet.OLEDB.4.0;Data Source=C:\Inetpub\wwwroot\MBSEBus\ASugrue\Databases\dbtotal.mdb";

  6. Open the Connection • Pass the connection string variable (in this case $connStr) to the open function //Open the connection to the database $conn->open($connStr);

  7. Reading from database //Code to create record set from your dB $rS = $conn->execute("SELECT * FROM tblCustomer"); $conn->execute() is used to run sql statements. $rS is created to store the record set from the sql statement

  8. Reading from database • Create variables to store the data from the record set $cust_id = $rS->Fields(0); $first_name = $rS->Fields(1);

  9. Reading from Database • Run a loop to iterate through all the records stored in the record set (as per the sql statement) while (!$rS->EOF) //while $rS is not at end of file (EOF) { echo $cust_id." ".$first_name."<br />\n"; $rS->MoveNext(); //move to next record }

  10. <?php //create an instance of the ADO connection object $conn = new COM('ADODB.Connection') or die('Cannot start ADO'); //define connection string variable to hold database driver details and location of dB //Make sure to change this to location of your DB $connStr = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:/inetpub/wwwroot/mbsebus/ASugrue/databases/dbtotal.accdb;Persist Security Info=False;"; // If using old access format .mdb the following connection string appropriate: $connStr = "PROVIDER=Microsoft.Jet.OLEDB.4.0;Data Source=C:\Inetpub\wwwroot\MBSEBus\ASugrue\Databases\dbtotal.mdb"; //Open the connection to the database $conn->open($connStr); //Code to create record set from your dB $rS = $conn->execute("SELECT * FROM tblCustomer"); $cust_id = $rS->Fields(0); $first_name = $rS->Fields(1); while (!$rS->EOF) { echo $cust_id." ".$first_name."<br/>"; $rS->MoveNext(); } $rS->Close(); $conn->Close(); ?>

  11. Reading from database $rS->Close(); //release memory from rS $conn->Close(); //release memory from conn • Important to close connection to database and to release memory struture of rS

  12. Inserting a record //Code to execute sql statement to insert name John into tblCustomer field FirstName $conn->execute("INSERT INTO tblCustomer (FirstName) VALUES ('John')"); • Each time this statement runs, it inserts name John into tblCustomer. Not a very useful piece of code!

  13. Inserting a record //Code to execute sql statement to insert the value of a name variable into tblCustomer field FirstName $conn->execute("INSERT INTO tblCustomer (FirstName) VALUES (‘$name')"); • Immediately more dynamic!

  14. Insert using form input <form action="insert.php" method="post"> First name: <input type="text" name="name" /><br /> <input type="submit"/> </form>

  15. <?php $conn = new COM('ADODB.Connection') or die('Cannot start ADO'); $connStr = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\inetpub\wwwroot\mbsebus\ASugrue\databases\dbtotal.accdb;Persist Security Info=False;"; $conn->open($connStr); $name = $_POST['name']; //Code to execute sql statement to insert name variable into tblCustomer field FirstName $conn->execute("INSERT INTO tblCustomer (FirstName) VALUES ('".$name."')"); echo "Name: ".$name." was inserted hopefully!"; $conn->Close(); ?>

  16. Good idea to Store SQL statements in variable! <?php $conn = new COM('ADODB.Connection') or die('Cannot start ADO'); $connStr = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\inetpub\wwwroot\mbsebus\ASugrue\databases\dbtotal.accdb;Persist Security Info=False;"; $conn->open($connStr); $name = $_POST['name']; $conn->execute("INSERT INTO tblCustomer (FirstName) VALUES ('".$name."')"); echo "Name: ".$name." was inserted hopefully!"; $conn->Close(); ?>

  17. Good idea to Store SQL statements in variable! <?php $conn = new COM('ADODB.Connection') or die('Cannot start ADO'); $connStr = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\inetpub\wwwroot\mbsebus\ASugrue\databases\dbtotal.accdb;Persist Security Info=False;"; $conn->open($connStr); $name = $_POST['name']; $sqlString = “INSERT INTO tblCustomer (FirstName) VALUES ('".$name."')”; $conn->execute($sqlString); echo "Name: ".$name." was inserted hopefully!"; $conn->Close(); ?>

  18. Update Record You might want to update data stored in the database. For instance, if someone needs to change the title or name of their project

  19. Update SQL Example: $sqlString="UPDATE tblCustomer SET FirstName=‘Jim' WHERE name=‘John'";

  20. Update Record <?php $conn = new COM('ADODB.Connection') or die('Cannot start ADO'); $connStr = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\inetpub\wwwroot\mbsebus\ASugrue\databases\dbtotal.accdb;Persist Security Info=False;"; $conn->open($connStr); $sqlString="UPDATE test SET name=‘Jim’ WHERE name=‘John’"; $conn->execute($sqlString); $conn->Close(); ?>

  21. Delete Record • You may need to remove data stored in your database. • For instance, the project is no longer sponsored by a company and their details must be removed from the dB

  22. Delete SQL $sqlStringDelete="DELETE * FROM tblCustomer WHERE FirstName=‘Sean’";

  23. Update Record <?php $conn = new COM('ADODB.Connection') or die('Cannot start ADO'); $connStr = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\inetpub\wwwroot\mbsebus\ASugrue\databases\dbtotal.accdb;Persist Security Info=False;"; $conn->open($connStr); $sqlStringDelete="DELETE * FROM tblCustomer WHERE FirstName=‘Sean’"; $conn->execute($sqlStringDelete); $conn->Close(); ?>

  24. For other databases - • http://www.connectionstrings.com/

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