Implemented savePreferences API

pkg/services/sqlstore/preferences.go

@@ -0,0 +1,37 @@
+package sqlstore
+
+import (
+	"github.com/grafana/grafana/pkg/bus"
+	m "github.com/grafana/grafana/pkg/models"
+)
+
+func init() {
+	bus.AddHandler("sql", SavePreferences)
+}
+
+func SavePreferences(cmd *m.SavePreferencesCommand) error {
+	return inTransaction2(func(sess *session) error {
+
+		sql := `SELECT * FROM preferences WHERE pref_id = ? ` +
+			`AND pref_type = ?`
+
+		var prefResults = make([]m.Preferences, 0)
+
+		resultsErr := sess.Sql(sql, cmd.PrefId, cmd.PrefType).Find(&prefResults)
+
+		if resultsErr != nil {
+			return resultsErr
+		}
+
+		var matchedPref m.Preferences
+		matchedPref = prefResults[0]
+		matchedPref.PrefData = cmd.PrefData
+		affectedRows, updateErr := sess.Id(matchedPref.Id).Update(&matchedPref)
+
+		if affectedRows == 0 {
+			return m.ErrPreferenceNotFound
+		}
+
+		return updateErr
+	})
+}