A couple more convenience functions

src/monger/core.clj

@@ -14,7 +14,7 @@
   monger.core
   (:refer-clojure :exclude [count])
   (:use [monger.conversion])
-  (:import [com.mongodb Mongo MongoURI DB WriteConcern DBObject DBCursor CommandResult Bytes MongoOptions ServerAddress MapReduceOutput]
+  (:import [com.mongodb Mongo MongoURI DB WriteConcern DBObject DBCursor Bytes MongoOptions ServerAddress MapReduceOutput]
            [com.mongodb.gridfs GridFS]
            [java.util Map ArrayList]))
 
@@ -36,7 +36,7 @@
 ;; API
 ;;
 
-(defn ^Mongo connect
+(defn ^com.mongodb.Mongo connect
   "Connects to MongoDB. When used without arguments, connects to
 
    Arguments:
@@ -71,7 +71,7 @@
      (Mongo. ^String host ^Long port)))
 
 
-(defn ^DB get-db-names
+(defn get-db-names
   "Gets a list of all database names present on the server"
   ([]
      (get-db-names *mongodb-connection*))
@@ -79,18 +79,24 @@
      (set (.getDatabaseNames connection))))
 
 
-(defn ^DB get-db
+(defn ^com.mongodb.DB get-db
   "Get database reference by name.
 
    EXAMPLES
 
        (monger.core/get-db \"myapp_production\")
        (monger.core/get-db connection \"myapp_production\")"
+  ([]
+     *mongodb-database*)
   ([^String name]
      (.getDB *mongodb-connection* name))
   ([^Mongo connection ^String name]
      (.getDB connection name)))
 
+(defn ^com.mongodb.DB current-db
+  "Returns currently used database"
+  []
+  *mongodb-database*)
 
 (defn authenticate
   ([^String db ^String username ^chars password]
@@ -179,6 +185,10 @@
   (alter-var-root (var *mongodb-gridfs*)   (constantly (GridFS. db))))
 
 
+(def ^{:doc "Combines set-db! and get-db, so (use-db \"mydb\") is the same as (set-db! (get-db \"mydb\"))"}
+  use-db! (comp set-db! get-db))
+
+
 (defn set-default-write-concern!
   [wc]
   "Set *mongodb-write-concert* var to :wc
@@ -213,7 +223,7 @@
     conn))
 
 
-(defn ^CommandResult command
+(defn ^com.mongodb.CommandResult command
   "Runs a database command (please check MongoDB documentation for the complete list of commands). Some common commands
   are:
 

test/monger/test/db_test.clj

@@ -1,7 +1,7 @@
 (ns monger.test.db-test
   (:require [monger core db]
             [monger.test.helper :as helper]
-            [monger.collection :as mgcol])
+            [monger.collection :as mc])
   (:import [com.mongodb Mongo DB]
            java.util.Set)
   (:use clojure.test))
@@ -27,17 +27,28 @@
     ;; drop a secondary database here. MK.
     (monger.core/with-db (monger.core/get-db "monger-test3")
       (let [collection "test"
-            _          (mgcol/insert collection { :name "Clojure" })
+            _          (mc/insert collection {:name "Clojure"})
-            check      (mgcol/count collection)
+            check      (mc/count collection)
             _          (monger.db/drop-db)]
         (is (= 1 check))
-        (is (not (mgcol/exists? collection)))
+        (is (not (mc/exists? collection)))
-        (is (= 0 (mgcol/count collection)))))))
+        (is (= 0 (mc/count collection))))))
+
+  (deftest test-use-database
+    (monger.core/use-db! "monger-test5")
+    (is (= "monger-test5" (.getName (monger.core/current-db))))
+    (let [collection "test"
+            _          (mc/insert collection {:name "Clojure"})
+            check      (mc/count collection)
+            _          (monger.db/drop-db)]
+        (is (= 1 check))
+        (is (not (mc/exists? collection)))
+        (is (= 0 (mc/count collection))))))
 
 
 (deftest test-get-collection-names
-  (mgcol/insert "test-1" { :name "Clojure" })
+  (mc/insert "test-1" {:name "Clojure"})
-  (mgcol/insert "test-2" { :name "Clojure" })
+  (mc/insert "test-2" {:name "Clojure"})
   (let [^Set collections (monger.db/get-collection-names)]
     (is (.contains collections "test-1"))
     (is (.contains collections "test-2"))))