add support for batch insert/exec with maps in addition to structs

.gitignore

@@ -22,3 +22,5 @@ _testmain.go
 *.exe
 tags
 environ
+
+.idea

named.go

@@ -157,6 +157,10 @@ func bindAnyArgs(names []string, arg interface{}, m *reflectx.Mapper) ([]interfa
 // type, given a list of names to pull out of the struct.  Used by public
 // BindStruct interface.
 func bindArgs(names []string, arg interface{}, m *reflectx.Mapper) ([]interface{}, error) {
+	if maparg, ok := arg.(map[string]interface{}); ok {
+		return bindMapArgs(names, maparg)
+	}
+
 	arglist := make([]interface{}, 0, len(names))
 
 	// grab the indirected value of arg

named_test.go

@@ -184,7 +184,7 @@ func TestNamedQueries(t *testing.T) {
 			t.Errorf("got %s, expected %s", p.Email, people[0].Email)
 		}
 
-		// test batch inserts
+		// test struct batch inserts
 		sls := []Person{
 			{FirstName: "Ardie", LastName: "Savea", Email: "[email protected]"},
 			{FirstName: "Sonny Bill", LastName: "Williams", Email: "[email protected]"},
@@ -195,6 +195,17 @@ func TestNamedQueries(t *testing.T) {
 			VALUES (:first_name, :last_name, :email)`, sls)
 		test.Error(err)
 
+		// test map batch inserts
+		slsMap := []map[string]interface{}{
+			{"first_name": "Ardie", "last_name": "Savea", "email": "[email protected]"},
+			{"first_name": "Sonny Bill", "last_name": "Williams", "email": "[email protected]"},
+			{"first_name": "Ngani", "last_name": "Laumape", "email": "[email protected]"},
+		}
+
+		_, err = db.NamedExec(`INSERT INTO person (first_name, last_name, email)
+			VALUES (:first_name, :last_name, :email)`, slsMap)
+		test.Error(err)
+
 		for _, p := range sls {
 			dest := Person{}
 			err = db.Get(&dest, db.Rebind("SELECT * FROM person WHERE email=?"), p.Email)