High Quality Content by WIKIPEDIA articles! Datamapper is an object-relational mapper library written in Ruby and commonly used with Merb. It was developed to address perceived shortcomings in Ruby on Rails' ActiveRecord library. Some features of Datamapper: * eager loading of child associations to avoid (N+1) queries * lazy loading of select properties, e.g., larger fields * query chaining, and not evaluating the query until absolutely necessary (using a lazy array implementation) * an API not too heavily oriented to SQL databases

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