ADOdb

Database support for adding comments varies from full support (IBM DB2, PostgreSQL) to none (SQLite) with differing implementation methods. Databases that support it do it via 1 of 2 methods, Either be adding the comment as part of the table creation and modification process, or by adding a comment to a previously created table. In addition, databases have varying levels of support for adding comments to tables, columns and indexes. The following matrix shows available methods across supported databases.