get_col("SHOW TABLES",0) as $table ) {
if ($table == $table_name) {
return true;
}
}
//didn't find it try to create it.
$wpdb->query($create_ddl);
// we cannot directly tell that whether this succeeded!
foreach ($wpdb->get_col("SHOW TABLES",0) as $table ) {
if ($table == $table_name) {
return true;
}
}
return false;
}
endif;
/**
** maybe_add_column()
** Add column to db table if it doesn't exist.
** Returns: true if already exists or on successful completion
** false on error
*/
if ( ! function_exists('maybe_add_column') ) :
function maybe_add_column($table_name, $column_name, $create_ddl) {
global $wpdb, $debug;
foreach ($wpdb->get_col("DESC $table_name",0) as $column ) {
if ($debug) echo("checking $column == $column_name
");
if ($column == $column_name) {
return true;
}
}
//didn't find it try to create it.
$wpdb->query($create_ddl);
// we cannot directly tell that whether this succeeded!
foreach ($wpdb->get_col("DESC $table_name",0) as $column ) {
if ($column == $column_name) {
return true;
}
}
return false;
}
endif;
/**
** maybe_drop_column()
** Drop column from db table if it exists.
** Returns: true if it doesn't already exist or on successful drop
** false on error
*/
function maybe_drop_column($table_name, $column_name, $drop_ddl) {
global $wpdb;
foreach ($wpdb->get_col("DESC $table_name",0) as $column ) {
if ($column == $column_name) {
//found it try to drop it.
$wpdb->query($drop_ddl);
// we cannot directly tell that whether this succeeded!
foreach ($wpdb->get_col("DESC $table_name",0) as $column ) {
if ($column == $column_name) {
return false;
}
}
}
}
// else didn't find it
return true;
}
/**
** check_column()
** Check column matches passed in criteria.
** Pass in null to skip checking that criteria
** Returns: true if it matches
** false otherwise
** (case sensitive) Column names returned from DESC table are:
** Field
** Type
** Null
** Key
** Default
** Extra
*/
function check_column($table_name, $col_name, $col_type, $is_null = null, $key = null, $default = null, $extra = null) {
global $wpdb, $debug;
$diffs = 0;
$results = $wpdb->get_results("DESC $table_name");
foreach ($results as $row ) {
if ($debug > 1) print_r($row);
if ($row->Field == $col_name) {
// got our column, check the params
if ($debug) echo ("checking $row->Type against $col_type\n");
if (($col_type != null) && ($row->Type != $col_type)) {
++$diffs;
}
if (($is_null != null) && ($row->Null != $is_null)) {
++$diffs;
}
if (($key != null) && ($row->Key != $key)) {
++$diffs;
}
if (($default != null) && ($row->Default != $default)) {
++$diffs;
}
if (($extra != null) && ($row->Extra != $extra)) {
++$diffs;
}
if ($diffs > 0) {
if ($debug) echo ("diffs = $diffs returning false\n");
return false;
}
return true;
} // end if found our column
}
return false;
}
/*
echo "testing
";
echo "";
//check_column('wp_links', 'link_description', 'mediumtext');
//if (check_column($wpdb->comments, 'comment_author', 'tinytext'))
// echo "ok\n";
$error_count = 0;
$tablename = $wpdb->links;
// check the column
if (!check_column($wpdb->links, 'link_description', 'varchar(255)'))
{
$ddl = "ALTER TABLE $wpdb->links MODIFY COLUMN link_description varchar(255) NOT NULL DEFAULT '' ";
$q = $wpdb->query($ddl);
}
if (check_column($wpdb->links, 'link_description', 'varchar(255)')) {
$res .= $tablename . ' - ok
';
} else {
$res .= 'There was a problem with ' . $tablename . '
';
++$error_count;
}
echo "";
*/
?>