Query.All() will init the slice as an empty slice if no result is ret…

…urned

query.go

@@ -191,6 +191,7 @@ func (q *Query) One(a interface{}) error {
 // All executes the SQL statement and populates all the resulting rows into a slice of struct or NullStringMap.
 // The slice must be given as a pointer. Each slice element must be either a struct or a NullStringMap.
 // Refer to Rows.ScanStruct() and Rows.ScanMap() for more details on how each slice element can be.
+// If the query returns no row, the slice will be an empty slice (not nil).
 func (q *Query) All(slice interface{}) error {
 	rows, err := q.Rows()
 	if err != nil {

query_test.go

@@ -140,6 +140,13 @@ func TestQuery_Rows(t *testing.T) {
 	err = db.NewQuery(sql).All(&customers4)
 	assert.NotNil(t, err)
 
+	var customers5 []Customer
+	err = db.NewQuery(`SELECT * FROM customer WHERE id=999`).All(&customers5)
+	if assert.Nil(t, err) {
+		assert.NotNil(t, customers5)
+		assert.Zero(t, len(customers5))
+	}
+
 	// One
 	var customer Customer
 	sql = `SELECT * FROM customer WHERE id={:id}`

rows.go

@@ -103,6 +103,11 @@ func (r *Rows) all(slice interface{}) error {
 		return VarTypeError("must be a slice of struct or NullStringMap")
 	}
 
+	if v.IsNil() {
+		// create an empty slice
+		v.Set(reflect.MakeSlice(v.Type(), 0, 0))
+	}
+
 	et := v.Type().Elem()
 
 	if et.Kind() == reflect.Map {