Execution Engine (Draft)
The engine receives SQL strings and execution options, executes the statements, and returns the results.
The eventual intent is to support multiple execution environments with a similar interface.
But for now, seaquell simply uses clojure.java.jdbc.
Public API
exec Function
To do its job, exec tries to figure out whether the statement returns results or not.
Most of the time it can do that by just looking at the SQL string.
For statements with leading with clauses, however, exec would basically have to parse the SQL to call the right function.
Instead, it relies on two additional checks.
First, it uses the select? and compound-select? predicate functions from the seaquell.utility namespace.
Those functions depend on one design detail of seaquell: SQL statements are maps with a :sql-stmt key to indicate their type.
Next, is looks at the :jdbc/query? option, which lets the caller direct which function to call.
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