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builder-adapter (clj)
(source)function
(builder-adapter builder-fn column-by-index-fn)
Given any builder function (e.g., `as-lower-maps`) and a column reading
function, return a new builder function that uses that column reading
function instead of `.getObject` and `read-column-by-index` so you can
override the default behavior.
The default column-by-index-fn behavior would be equivalent to:
(defn default-column-by-index-fn
[builder ^ResultSet rs ^Integer i]
(read-column-by-index (.getObject rs i) (:rsmeta builder) i))
Your column-by-index-fn can use the result set metadata `(:rsmeta builder)`
and/or the (processed) column name `(nth (:cols builder) (dec i))` to
determine whether to call `.getObject` or some other method to read the
column's value, and can choose whether or not to use the `ReadableColumn`
protocol-based value processor (and could add metadata to the value to
satisfy that protocol on a per-instance basis).
Examples
next-jdbc
(ns next.jdbc-test
"Basic tests for the primary API of `next.jdbc`."
(:require [clojure.core.reducers :as r]
[clojure.string :as str]
[clojure.test :refer [deftest is testing use-fixtures]]
[next.jdbc :as jdbc]
[next.jdbc.connection :as c]
[next.jdbc.test-fixtures
:refer [with-test-db db ds column
default-options stored-proc?
derby? hsqldb? jtds? mssql? mysql? postgres? sqlite?]]
[next.jdbc.prepare :as prep]
[next.jdbc.result-set :as rs]
[next.jdbc.specs :as specs]
[next.jdbc.types :as types])
(:import (com.zaxxer.hikari HikariDataSource)
(com.mchange.v2.c3p0 ComboPooledDataSource PooledDataSource)
(java.sql ResultSet ResultSetMetaData)))
(deftest bool-tests
(doseq [[n b] [["zero" 0] ["one" 1] ["false" false] ["true" true]]
:let [v-bit (if (number? b) b (if b 1 0))
v-bool (if (number? b) (pos? b) b)]]
(jdbc/execute-one!
(ds)
["insert into btest (name,is_it,twiddle) values (?,?,?)"
n
(if (postgres?)
(types/as-boolean b)
b) ; 0, 1, false, true are all acceptable
(cond (hsqldb?)
v-bool ; hsqldb requires a boolean here
(postgres?)
(types/as-other v-bit) ; really postgres??
:else
v-bit)]))
(let [data (jdbc/execute! (ds) ["select * from btest"]
(default-options))]
(if (sqlite?)
(is (every? number? (map (column :BTEST/IS_IT) data)))
(is (every? boolean? (map (column :BTEST/IS_IT) data))))
(if (or (sqlite?) (derby?))
(is (every? number? (map (column :BTEST/TWIDDLE) data)))
(is (every? boolean? (map (column :BTEST/TWIDDLE) data)))))
(let [data (jdbc/execute! (ds) ["select * from btest"]
(cond-> (default-options)
(sqlite?)
(assoc :builder-fn
(rs/builder-adapter
rs/as-maps
(fn [builder ^ResultSet rs ^Integer i]
(let [rsm ^ResultSetMetaData (:rsmeta builder)]
(rs/read-column-by-index
;; we only use bit and bool for
;; sqlite (not boolean)
(if (#{"BIT" "BOOL"} (.getColumnTypeName rsm i))
(.getBoolean rs i)
(.getObject rs i))
rsm
i)))))))]
(is (every? boolean? (map (column :BTEST/IS_IT) data)))
(if (derby?)
(is (every? number? (map (column :BTEST/TWIDDLE) data)))
(is (every? boolean? (map (column :BTEST/TWIDDLE) data)))))
(let [data (reduce (fn [acc row]
(conj acc (cond-> (select-keys row [:is_it :twiddle])
(sqlite?)
(update :is_it pos?)
(or (sqlite?) (derby?))
(update :twiddle pos?))))
[]
(jdbc/plan (ds) ["select * from btest"]))]
(is (every? boolean? (map :is_it data)))
(is (every? boolean? (map :twiddle data)))))
seancorfield/next-jdbc
(ns next.jdbc-test
"Basic tests for the primary API of `next.jdbc`."
(:require [clojure.core.reducers :as r]
[clojure.string :as str]
[clojure.test :refer [deftest is testing use-fixtures]]
[next.jdbc :as jdbc]
[next.jdbc.connection :as c]
[next.jdbc.test-fixtures
:refer [with-test-db db ds column
default-options stored-proc?
derby? hsqldb? jtds? mssql? mysql? postgres? sqlite?]]
[next.jdbc.prepare :as prep]
[next.jdbc.result-set :as rs]
[next.jdbc.specs :as specs]
[next.jdbc.types :as types])
(:import (com.zaxxer.hikari HikariDataSource)
(com.mchange.v2.c3p0 ComboPooledDataSource PooledDataSource)
(java.sql ResultSet ResultSetMetaData)))
(deftest bool-tests
(doseq [[n b] [["zero" 0] ["one" 1] ["false" false] ["true" true]]
:let [v-bit (if (number? b) b (if b 1 0))
v-bool (if (number? b) (pos? b) b)]]
(jdbc/execute-one!
(ds)
["insert into btest (name,is_it,twiddle) values (?,?,?)"
n
(if (postgres?)
(types/as-boolean b)
b) ; 0, 1, false, true are all acceptable
(cond (hsqldb?)
v-bool ; hsqldb requires a boolean here
(postgres?)
(types/as-other v-bit) ; really postgres??
:else
v-bit)]))
(let [data (jdbc/execute! (ds) ["select * from btest"]
(default-options))]
(if (sqlite?)
(is (every? number? (map (column :BTEST/IS_IT) data)))
(is (every? boolean? (map (column :BTEST/IS_IT) data))))
(if (or (sqlite?) (derby?))
(is (every? number? (map (column :BTEST/TWIDDLE) data)))
(is (every? boolean? (map (column :BTEST/TWIDDLE) data)))))
(let [data (jdbc/execute! (ds) ["select * from btest"]
(cond-> (default-options)
(sqlite?)
(assoc :builder-fn
(rs/builder-adapter
rs/as-maps
(fn [builder ^ResultSet rs ^Integer i]
(let [rsm ^ResultSetMetaData (:rsmeta builder)]
(rs/read-column-by-index
;; we only use bit and bool for
;; sqlite (not boolean)
(if (#{"BIT" "BOOL"} (.getColumnTypeName rsm i))
(.getBoolean rs i)
(.getObject rs i))
rsm
i)))))))]
(is (every? boolean? (map (column :BTEST/IS_IT) data)))
(if (derby?)
(is (every? number? (map (column :BTEST/TWIDDLE) data)))
(is (every? boolean? (map (column :BTEST/TWIDDLE) data)))))
(let [data (reduce (fn [acc row]
(conj acc (cond-> (select-keys row [:is_it :twiddle])
(sqlite?)
(update :is_it pos?)
(or (sqlite?) (derby?))
(update :twiddle pos?))))
[]
(jdbc/plan (ds) ["select * from btest"]))]
(is (every? boolean? (map :is_it data)))
(is (every? boolean? (map :twiddle data)))))