SQLStore: Run tests as integration tests (#28265)

* sqlstore: Run tests as integration tests

* Truncate database instead of re-creating it on each test

* Fix test description

See https://github.com/grafana/grafana/pull/12129

* Fix lint issues

* Fix postgres dialect after review suggestion

* Rename and document functions after review suggestion

* Add periods

* Fix auto-increment value for mysql dialect

Co-authored-by: Emil Tullstedt <emil.tullstedt@grafana.com>

pkg/services/sqlstore/migrator/mysql_dialect.go

@@ -1,6 +1,7 @@
 package migrator
 
 import (
+	"fmt"
 	"strconv"
 	"strings"
 
@@ -137,6 +138,36 @@ func (db *Mysql) CleanDB() error {
 	return nil
 }
 
+// TruncateDBTables truncates all the tables.
+// A special case is the dashboard_acl table where we keep the default permissions.
+func (db *Mysql) TruncateDBTables() error {
+	tables, err := db.engine.DBMetas()
+	if err != nil {
+		return err
+	}
+	sess := db.engine.NewSession()
+	defer sess.Close()
+
+	for _, table := range tables {
+		switch table.Name {
+		case "dashboard_acl":
+			// keep default dashboard permissions
+			if _, err := sess.Exec(fmt.Sprintf("DELETE FROM %v WHERE dashboard_id != -1 AND org_id != -1;", db.Quote(table.Name))); err != nil {
+				return errutil.Wrapf(err, "failed to truncate table %q", table.Name)
+			}
+			if _, err := sess.Exec(fmt.Sprintf("ALTER TABLE %v AUTO_INCREMENT = 3;", db.Quote(table.Name))); err != nil {
+				return errutil.Wrapf(err, "failed to reset table %q", table.Name)
+			}
+		default:
+			if _, err := sess.Exec(fmt.Sprintf("TRUNCATE TABLE %v;", db.Quote(table.Name))); err != nil {
+				return errutil.Wrapf(err, "failed to truncate table %q", table.Name)
+			}
+		}
+	}
+
+	return nil
+}
+
 func (db *Mysql) isThisError(err error, errcode uint16) bool {
 	if driverErr, ok := err.(*mysql.MySQLError); ok {
 		if driverErr.Number == errcode {