The SELECT statement is used to select data from a database. Syntax SELECT column_name(s) FROM table_name To learn more ab...
The SELECT statement is used to select data from a database.
Syntax
SELECT column_name(s)
FROM table_name
|
To learn more about SQL, please visit our
SQL tutorial.
To get PHP to execute the statement above we must use the mysql_query() function. This function is used to
send a query or command to a MySQL connection.
Example
The following example selects all the data stored in the "Persons" table
(The *
character selects all the data in the table):
<?php
$con = mysql_connect("localhost","peter","abc123");
if (!$con)
{
die('Could not connect: ' . mysql_error());
}
mysql_select_db("my_db", $con);
$result = mysql_query("SELECT * FROM Persons");
while($row = mysql_fetch_array($result))
{
echo $row['FirstName'] . " " . $row['LastName'];
echo "<br />";
}
mysql_close($con);
?>
|
The example above stores the data returned by the mysql_query() function in the
$result variable.
Next, we use the mysql_fetch_array() function to return
the first row from the recordset as an
array. Each call to mysql_fetch_array() returns the next row in
the recordset. The while loop loops through all the records in the
recordset. To print the value of each row, we use the PHP $row variable
($row['FirstName'] and $row['LastName']).
The output of the code above will be:
Peter Griffin
Glenn Quagmire
|
Display the Result in an HTML Table
The following example selects the same data as the example above, but will
display the data in
an HTML table:
<?php
$con = mysql_connect("localhost","peter","abc123");
if (!$con)
{
die('Could not connect: ' . mysql_error());
}
mysql_select_db("my_db", $con);
$result = mysql_query("SELECT * FROM Persons");
echo "<table border='1'>
<tr>
<th>Firstname</th>
<th>Lastname</th>
</tr>";
while($row = mysql_fetch_array($result))
{
echo "<tr>";
echo "<td>" . $row['FirstName'] . "</td>";
echo "<td>" . $row['LastName'] . "</td>";
echo "</tr>";
}
echo "</table>";
mysql_close($con);
?>
|
The output of the code above will be:
| Firstname |
Lastname |
| Glenn |
Quagmire |
| Peter |
Griffin |
