Added backend API for stats

pkg/services/sqlstore/stats.go

@@ -8,6 +8,7 @@ import (
 func init() {
 	bus.AddHandler("sql", GetSystemStats)
 	bus.AddHandler("sql", GetDataSourceStats)
+  bus.AddHandler("sql", GetAdminStats)
 }
 
 func GetDataSourceStats(query *m.GetDataSourceStatsQuery) error {
@@ -46,3 +47,49 @@ func GetSystemStats(query *m.GetSystemStatsQuery) error {
 	query.Result = &stats
 	return err
 }
+
+func GetAdminStats(query *m.GetAdminStatsQuery) error {
+  var rawSql = `SELECT
+      (
+        SELECT COUNT(*)
+        FROM ` + dialect.Quote("user") + `
+      ) AS user_count,
+      (
+        SELECT COUNT(*)
+        FROM ` + dialect.Quote("org") + `
+      ) AS org_count,
+      (
+        SELECT COUNT(*)
+        FROM ` + dialect.Quote("dashboard") + `
+      ) AS dashboard_count,
+      (
+        SELECT COUNT(*)
+        FROM ` + dialect.Quote("dashboard_snapshot") + `
+      ) AS db_snapshot_count,
+      (
+        SELECT COUNT(*)
+        FROM ` + dialect.Quote("dashboard_tag") + `
+      ) AS db_tag_count,
+      (
+        SELECT COUNT(*)
+        FROM ` + dialect.Quote("data_source") + `
+      ) AS datasource_count,
+      (
+        SELECT COUNT(*)
+        FROM ` + dialect.Quote("playlist") + `
+      ) AS playlist_count,
+      (
+        SELECT DISTINCT(dashboard_id)
+        FROM ` + dialect.Quote("star") + `
+      ) AS starred_db_count
+      `
+
+  var stats m.AdminStats
+  _, err := x.Sql(rawSql).Get(&stats)
+  if err != nil {
+    return err
+  }
+
+  query.Result = &stats
+  return err
+}