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db/api defines database connection, syntax, statement, and result set interfaces
- a syntax defines how to convert structured input into a string
- a connection creates statements that accept syntax input
- a statement can be submitted to obtain a result set
db/request defines request composer and template interfaces and provides default implementations
- a template is an immutable super-set of possible queries
  - consists of multiple layers, each handling different aspects of the query, such as filter conditions or materialization
- a composer describes how to build a concrete query from a template
map/entity allows to create objects from result set rows
map/graph allows to cache objects by their ID
map/request provides templates for requests that return objects instead of result sets
set/dsl provides foundation for high-level query interface
at/model provides reader for JPA annotations
sql/syntax defines the SQL syntax as interface and provides ANSI SQL implementation
sql/request provides templates for SQL statements
sql/map merges sql/request and map/request
sql/set provides high-level interface for mapped SQL queries
ext/jdbc provides JDBC connection
ext/mysql, hana implement SQL dialects, respectively

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