The UPDATE statement is used to update existing records in a table. Syntax UPDATE table_name SET column1=value, column2=value2,... ...
The UPDATE statement is used to update existing records in a table.
Syntax
UPDATE table_name
SET column1=value, column2=value2,...
WHERE some_column=some_value
|
Note: Notice the WHERE clause in the UPDATE syntax. The WHERE clause
specifies which record or records that should be updated. If you omit the WHERE
clause, all records will be updated!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
Earlier in the tutorial we created a table named "Persons". Here is how it
looks:
| FirstName |
LastName |
Age |
| Peter |
Griffin |
35 |
| Glenn |
Quagmire |
33 |
The following example updates some data in the "Persons" table:
<?php
$con = mysql_connect("localhost","peter","abc123");
if (!$con)
{
die('Could not connect: ' . mysql_error());
}
mysql_select_db("my_db", $con);
mysql_query("UPDATE Persons SET Age = '36'
WHERE FirstName = 'Peter' AND LastName = 'Griffin'");
mysql_close($con);
?>
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After the update, the "Persons" table will look like this:
| FirstName |
LastName |
Age |
| Peter |
Griffin |
36 |
| Glenn |
Quagmire |
33 |
