return more child counts and format sql

server/ctrlsubsonic/testdata/test_get_artists_no_args

@@ -10,7 +10,7 @@
           "name": "#",
           "artist": [
             {
-              "id": 3,
+              "id": "3",
               "name": "13th Floor Elevators",
               "albumCount": 2
             }
@@ -20,12 +20,12 @@
           "name": "a",
           "artist": [
             {
-              "id": 2,
+              "id": "2",
               "name": "A Certain Ratio",
               "albumCount": 2
             },
             {
-              "id": 4,
+              "id": "4",
               "name": "Anikas",
               "albumCount": 1
             }
@@ -35,7 +35,7 @@
           "name": "c",
           "artist": [
             {
-              "id": 7,
+              "id": "7",
               "name": "Captain Beefheart & His Magic Band",
               "albumCount": 1
             }
@@ -45,7 +45,7 @@
           "name": "j",
           "artist": [
             {
-              "id": 1,
+              "id": "1",
               "name": "Jah Wobble, The Edge & Holger Czukay",
               "albumCount": 1
             }
@@ -55,7 +55,7 @@
           "name": "s",
           "artist": [
             {
-              "id": 5,
+              "id": "5",
               "name": "Swell Maps",
               "albumCount": 2
             }
@@ -65,7 +65,7 @@
           "name": "t",
           "artist": [
             {
-              "id": 6,
+              "id": "6",
               "name": "Ten Years After",
               "albumCount": 1
             }