Select Data From a Database Table

Select Data From a Database Table

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):

$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 "
";

  }

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:

$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 "

";

while($row = mysql_fetch_array($result))

  {

  echo "

";

  echo "

";

  echo "

";

  echo "

";

  }

echo "

Firstname	Lastname
" . $row['FirstName'] . "	" . $row['LastName'] . "

";

mysql_close($con);

?>

The output of the code above will be:

Firstname	Lastname
Glenn	Quagmire
Peter	Griffin