How to add fields in php

php method to add fields: first open the corresponding PHP file; then add fields through the "mysql_query("ALTER TABLE `article` ADD `keywords` varchar(100) NOT NULL default "")" method.

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PHP operation MySQL adds a column (one field) to the table

For an already established database, the following methods can be used to add new fields to a table that already has fields:

mysql_query(“ALTER TABLE `表名` ADD `字段` 字段类型”) or die(mysql_error());

For example, add the field keywords to the table article

<?php
$link = mysql_connect($servername,$dbusername,$dbpassword);
if (mysql_select_db($dbname)) {
if ($link) {
echo “connect succeed”;
mysql_query("ALTER TABLE `article` ADD `keywords` varchar(100) NOT NULL default "") or die(mysql_error());
echo “Add succeed”;
} else {
echo “connect failed”;
}
mysql_close($link);
}
?>

Another: Use the keyword AFTER to add a new field after the current specific field (that is, insert a column between two columns)

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