update readme, fix invalid command cause goroutine stuck

Author: xinbg

README.md

@@ -91,3 +91,7 @@ Which will be handy when that pm tells you to change somebody's coins to 2^10.
 ##### Road Map
 
 Mostly all that `TODO` in the code, and tell others about this project.
+
+Apparently from the go report page, there is quiet a lot things to fix, but not sure should fix that.
+
+Better error handle, for example if a SQL is invalid, should suggest what's wrong.

main.go

@@ -36,21 +36,22 @@ func sqlRunner(sql string, resultCh chan string, errCh chan error) (chan string,
 		} else {
 			errCh <- err
 		}
-	}
-	if sqlparser.DescRegexp.MatchString(sql) && sqlparser.TableRegexp.MatchString(sql) {
+	} else if sqlparser.DescRegexp.MatchString(sql) && sqlparser.TableRegexp.MatchString(sql) {
 		if r, err := executors.DescribeTable(sql + " END"); err == nil {
 			resultCh <- r
 		} else {
 			errCh <- err
 		}
-	}
-	// TODO require WHERE field, update all seems not so safe?
-	if sqlparser.UpdateRegexp.MatchString(sql) {
+	} else if sqlparser.UpdateRegexp.MatchString(sql) {
+		// TODO require WHERE field, update all seems not so safe?
 		if r, err := executors.Update(sql + " END"); err == nil {
 			resultCh <- r
 		} else {
 			errCh <- err
 		}
+	} else {
+		resultCh <- ""
+		errCh <- nil
 	}
 	// TODO support SHOW TABLE
 	return resultCh, errCh