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It is possible to create tables with cells that stretch over two or more columns or rows (also known as merged cells). For columns, one uses |colspan=n | content, whereas for rows, one uses |rowspan=m | content. In the table code, one must leave out the cells that are covered by such a span. The resulting column- and row-counting must fit.
Single table inheritance is a way to emulate object-oriented inheritance in a relational database. When mapping from a database table to an object in an object-oriented language , a field in the database identifies what class in the hierarchy the object belongs to. [ 1 ]
An alternative to implementing ORM is use of the native procedural languages provided with every major database. These can be called from the client using SQL statements. The Data Access Object (DAO) design pattern is used to abstract these statements and offer a lightweight object-oriented interface to the rest of the application. [5]
jQuery object methods typically also return a jQuery object, which enables the use of method chains: $ ( 'div.test' ) . on ( 'click' , handleTestClick ) . addClass ( 'foo' ); This line finds all div elements with class attribute test , then registers an event handler on each element for the "click" event, then adds the class attribute foo to ...
Editors sometimes use headerless tables as an aid to content layout, especially where it is easier than the equivalent use of divs and CSS styling. For complex layouts, rowspan and colspan may be used, but again it is sometimes simpler and more maintainable to use nested tables. Nested tables must start on a new line.