next.jdbc.plan
Some helper functions that make common operations with next.jdbc/plan
much easier.
Some helper functions that make common operations with `next.jdbc/plan` much easier.
select!clj
(select! connectable cols sql-params)(select! connectable cols sql-params opts)Execute the SQL and params using next.jdbc/plan and (by default)
return a vector of rows with just the selected columns.
(plan/select! ds [:id :name] ["select * from table"])
If the cols argument is a vector of columns to select, then it is
applied as:
(into [] (map #(select-keys % cols)) (jdbc/plan ...))
Otherwise, the cols argument is used as a function and mapped over
the raw result set as:
(into [] (map cols) (jdbc/plan ...))
The usual caveats apply about operations on a raw result set that can be done without realizing the whole row.
Note: this allows for the following usage, which returns a vector of all the values for a single column:
(plan/select! ds :id ["select * from table"])
The result is a vector by default, but can be changed using the
:into option to provide the initial data structure into which
the selected columns are poured, e.g., :into #{}
Execute the SQL and params using `next.jdbc/plan` and (by default)
return a vector of rows with just the selected columns.
`(plan/select! ds [:id :name] ["select * from table"])`
If the `cols` argument is a vector of columns to select, then it is
applied as:
`(into [] (map #(select-keys % cols)) (jdbc/plan ...))`
Otherwise, the `cols` argument is used as a function and mapped over
the raw result set as:
`(into [] (map cols) (jdbc/plan ...))`
The usual caveats apply about operations on a raw result set that
can be done without realizing the whole row.
Note: this allows for the following usage, which returns a vector
of all the values for a single column:
`(plan/select! ds :id ["select * from table"])`
The result is a vector by default, but can be changed using the
`:into` option to provide the initial data structure into which
the selected columns are poured, e.g., `:into #{}`select-one!clj
(select-one! connectable cols sql-params)(select-one! connectable cols sql-params opts)Execute the SQL and params using next.jdbc/plan and return just the
selected columns from just the first row.
(plan/select-one! ds [:total] ["select count(*) as total from table"])
;;=> {:total 42}
If the cols argument is a vector of columns to select, then it is
applied using select-keys, otherwise, the cols argument is used as
a function directly. That means it can be a simple keyword to return
just that column -- which is the most common expected usage:
(plan/select-one! ds :total ["select count(*) as total from table"])
;;=> 42
The usual caveats apply about operations on a raw result set that can be done without realizing the whole row.
Execute the SQL and params using `next.jdbc/plan` and return just the
selected columns from just the first row.
`(plan/select-one! ds [:total] ["select count(*) as total from table"])`
;;=> {:total 42}
If the `cols` argument is a vector of columns to select, then it is
applied using `select-keys`, otherwise, the `cols` argument is used as
a function directly. That means it can be a simple keyword to return
just that column -- which is the most common expected usage:
`(plan/select-one! ds :total ["select count(*) as total from table"])`
;;=> 42
The usual caveats apply about operations on a raw result set that
can be done without realizing the whole row.cljdoc is a website building & hosting documentation for Clojure/Script libraries
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