get_col("SHOW TABLES",0) as $table ) { if ($table == $table_name) { return true; } } //didn't find it try to create it. $q = $wpdb->query($create_ddl); // we cannot directly tell that whether this succeeded! foreach ($wpdb->get_col("SHOW TABLES",0) as $table ) { if ($table == $table_name) { return true; } } return false; } /** ** maybe_add_column() ** Add column to db table if it doesn't exist. ** Returns: true if already exists or on successful completion ** false on error */ function maybe_add_column($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. $q = $wpdb->query($create_ddl); // we cannot directly tell that whether this succeeded! foreach ($wpdb->get_col("DESC $table_name",0) as $column ) { if ($column == $column_name) { return true; } } return false; } /** ** maybe_drop_column() ** Drop column from db table if it exists. ** Returns: true if it doesn't already exist or on successful drop ** false on error */ function maybe_drop_column($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. $q = $wpdb->query($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($tablecomments, 'comment_author', 'tinytext'))
//    echo "ok\n";
$error_count = 0;
$tablename = $tablelinks;
// check the column
if (!check_column($tablelinks, 'link_description', 'varchar(255)'))
{
    $ddl = "ALTER TABLE $tablelinks MODIFY COLUMN link_description varchar(255) NOT NULL DEFAULT '' ";
    $q = $wpdb->query($ddl);
}
if (check_column($tablelinks, 'link_description', 'varchar(255)')) {
    $res .= $tablename . ' - ok 
'; } else { $res .= 'There was a problem with ' . $tablename . '
'; ++$error_count; } echo "
"; */ ?>