Techniques are described for constructing a query associated with different data sources. In one example, a method includes identifying a particular data source associated with at least one entity. Obtain a set of data source information defining each entities and a set of metadata associated with the particular data source. Then, provide at least a portion of the defined entities for selection associated with the query builder framework for presentation. In response to identifying a selection of a particular entity, the query builder UI provides for presentation a set of attributes associated with the particular selected entity for selection. In response to identifying a selection of a subset of the presented set of attributes, construct a query based on the particular selected entity and the selected subset of the presented set of attributes in a specified query format associated with the custom adapter associated with the particular data source.