fix: calling the Query API, check if the Command parameter is empty

Signed-off-by: Young Xu <[email protected]>

opengemini/error.go

@@ -54,3 +54,10 @@ func checkDatabaseAndPolicy(database, retentionPolicy string) error {
 	}
 	return nil
 }
+
+func checkCommand(cmd string) error {
+	if len(cmd) == 0 {
+		return ErrEmptyCommand
+	}
+	return nil
+}

opengemini/query.go

@@ -44,6 +44,10 @@ type Query struct {
 
 // Query sends a command to the server
 func (c *client) Query(q Query) (*QueryResult, error) {
+	if err := checkCommand(q.Command); err != nil {
+		return nil, err
+	}
+
 	req := buildRequestDetails(c.config, func(req *requestDetails) {
 		req.queryValues.Add("db", q.Database)
 		req.queryValues.Add("q", q.Command)