fix #264

CHANGELOG.md

@@ -3,6 +3,7 @@
 Only accretive/fixative changes will be made from now on.
 
 * 1.3.next in progress
+  * Address [#264](https://github.com/seancorfield/next-jdbc/issues/264) by letting `insert-multi!` accept empty rows (and producing an empty result vector). This improves compatibility with `clojure.javaj.jdbc`.
   * Address [#258](https://github.com/seancorfield/next-jdbc/issues/258) by updating all the library (driver) versions in Getting Started to match the latest versions being tested (from `deps.edn`).
   * Expand examples for calling `next.jdbc.sql/find-by-keys` to show `LIKE` and `IN` clauses.
   * Update `tools.build` to 0.9.6 (and get rid of `template/pom.xml` in favor of new `:pom-data` option to `b/write-pom`).

doc/getting-started.md

@@ -77,6 +77,11 @@ We described the database with just `:dbtype` and `:dbname` because it is create
 
 > Note: You can see the full list of `:dbtype` values supported in [next.jdbc/get-datasource](https://cljdoc.org/d/com.github.seancorfield/next.jdbc/CURRENT/api/next.jdbc#get-datasource)'s docstring. If you need this programmatically, you can get it from the [next.jdbc.connection/dbtypes](https://cljdoc.org/d/com.github.seancorfield/next.jdbc/CURRENT/api/next.jdbc.connection#dbtypes) hash map. If those lists differ, the hash map is the definitive list (and I'll need to fix the docstring!). The docstring of that Var explains how to tell `next.jdbc` about additional databases.
 
+The hash map can contain arbitrary keys and values: any keys not specifically
+recognized by `next.jdbc` will be passed through to the JDBC driver as part
+of the connection string. For example, if you specify `:useSSL false`, then
+the connection string will have `&useSSL=false` appended to it.
+
 If you already have a JDBC URL (string), you can use that as-is instead of the db-spec hash map. If you have a JDBC URL and still need additional options passed into the JDBC driver, you can use a hash map with the `:jdbcUrl` key specifying the string and whatever additional options you need.
 
 ### `execute!` & `execute-one!`

src/next/jdbc/specs.clj

@@ -205,10 +205,10 @@
           :with-rows-and-columns
           (s/and (s/cat :connectable ::connectable
                         :table keyword?
-                        :cols (s/coll-of keyword?
-                                         :kind sequential?
-                                         :min-count 1)
-                        :rows (s/coll-of (s/coll-of any? :kind sequential?)
+                        :cols (s/coll-of keyword? :kind sequential?)
+                        :rows (s/coll-of (s/coll-of any?
+                                                    :kind sequential?
+                                                    :min-count 1)
                                          :kind sequential?)
                         :opts (s/? ::opts-map))
                  #(apply = (count (:cols %))
@@ -216,9 +216,7 @@
           :with-hash-maps
           (s/cat :connectable ::connectable
                  :table keyword?
-                 :hash-maps (s/coll-of map?
-                                       :kind sequential?
-                                       :min-count 1)
+                 :hash-maps (s/coll-of map? :kind sequential?)
                  :opts (s/? ::opts-map))))
 
 (s/fdef sql/query

src/next/jdbc/sql.clj

@@ -1,4 +1,4 @@
-;; copyright (c) 2019-2022 Sean Corfield, all rights reserved
+;; copyright (c) 2019-2023 Sean Corfield, all rights reserved
 
 (ns next.jdbc.sql
   "Some utility functions that make common operations easier by
@@ -78,7 +78,9 @@
          (throw (IllegalArgumentException.
                  "insert-multi! hash maps must all have the same keys")))
        (insert-multi! connectable table cols (map ->row hash-maps-or-cols) opts-or-rows))
-     (insert-multi! connectable table hash-maps-or-cols opts-or-rows {})))
+     (if (map? opts-or-rows)
+       (insert-multi! connectable table hash-maps-or-cols [] opts-or-rows)
+       (insert-multi! connectable table hash-maps-or-cols opts-or-rows {}))))
   ([connectable table cols rows opts]
    (if (seq rows)
      (let [opts   (merge (:options connectable) opts)

test/next/jdbc/sql_test.clj

@@ -1,4 +1,4 @@
-;; copyright (c) 2019-2021 Sean Corfield, all rights reserved
+;; copyright (c) 2019-2023 Sean Corfield, all rights reserved
 
 (ns next.jdbc.sql-test
   "Tests for the syntactic sugar SQL functions."
@@ -193,13 +193,27 @@
       (is (= {:next.jdbc/update-count 2}
              (sql/delete! (ds) :fruit ["id > ?" 10])))
       (is (= 4 (count (sql/query (ds) ["select * from fruit"])))))
-    (testing "empty insert-multi!" ; per #44
+    (testing "empty insert-multi!" ; per #44 and #264
       (is (= [] (sql/insert-multi! (ds) :fruit
                                    [:name :appearance :cost :grade]
                                    []
                                    {:suffix
                                     (when (sqlite?)
-                                      "RETURNING *")}))))))
+                                      "RETURNING *")})))
+      ;; per #264 the following should all be legal too:
+      (is (= [] (sql/insert-multi! (ds) :fruit
+                                   []
+                                   {:suffix
+                                    (when (sqlite?)
+                                      "RETURNING *")})))
+      (is (= [] (sql/insert-multi! (ds) :fruit
+                                   []
+                                   []
+                                   {:suffix
+                                    (when (sqlite?)
+                                      "RETURNING *")})))
+      (is (= [] (sql/insert-multi! (ds) :fruit [])))
+      (is (= [] (sql/insert-multi! (ds) :fruit [] []))))))
 
 (deftest no-empty-example-maps
   (is (thrown? clojure.lang.ExceptionInfo