wilamowski-b-m-irwin-j-d-industrial-communication-systems-2011

62-12 Industrial Communication Systems
62.5.5 Insert, Update and Delete queries
To insert data into a database table, use INSERT INTO Statement.
Example:
mysql_query("INSERT INTO employeeinfo (LastName, FirstName,
Department, Employee_ID)
VALUES ('Rives', 'John', 'sales', '2')");
$_POST is used to collect data from a form and if you substitute it in VALUES, parameters of a form
can be inserted into a table.
To update existing records in a table, use UPDATE statement.
Example:
mysql_query("UPDATE employeeinfo SET LastName= 'Rives' WHERE
FirstName = 'John' AND Employee_ID = '2' ");
or
mysql_query("UPDATE employeeinfo SET LastName= 'Rives' ".
"WHERE FirstName = 'John' AND Employee_ID = '2' ");
To delete existing records, use DELETE statement,
mysql_query("DELETE FROM employeeinfo WHERE LastName='Tent' ");
62.5.5.1 Select Query
To select records from database, we use the SELECT statement.
Example:
To select all the records from the table employeeinfo
$result = mysql_query("SELECT * FROM employeeinfo");
The data returned by mysql_query is stored in the variable $result.
Now we use mysql_fetch_array() function to return to the first row of the table. And each time a call
to mysql_fetch_array() returns the next row in the table.
Example:
while($row = mysql_fetch_array($result) )
{
echo $row['LastName']. " ". $row['FirstName']. " ".
$row['Department']. " ". $row['Employee_ID'];
echo "";
}
Output:
Rives John sales 2
Tent Tom accounts 1
Hold Tim technical 5
© 2011 by Taylor and Francis Group, LLC