fix: handle Disconnect() errors in connect, reconnect, and disconnect

Author: retran

mdl/executor/executor_connect.go

@@ -12,7 +12,9 @@ import (
 func execConnect(ctx *ExecContext, s *ast.ConnectStmt) error {
 	e := ctx.executor
 	if e.backend != nil && e.backend.IsConnected() {
-		e.backend.Disconnect()
+		if err := e.backend.Disconnect(); err != nil {
+			fmt.Fprintf(ctx.Output, "Warning: disconnect error: %v\n", err)
+		}
 	}
 
 	if e.backendFactory == nil {
@@ -61,7 +63,9 @@ func reconnect(ctx *ExecContext) error {
 
 	// Close existing connection
 	if e.backend != nil && e.backend.IsConnected() {
-		e.backend.Disconnect()
+		if err := e.backend.Disconnect(); err != nil {
+			fmt.Fprintf(ctx.Output, "Warning: disconnect error: %v\n", err)
+		}
 	}
 
 	// Reopen connection
@@ -101,7 +105,9 @@ func execDisconnect(ctx *ExecContext) error {
 		fmt.Fprintf(ctx.Output, "Warning: finalization error: %v\n", err)
 	}
 
-	e.backend.Disconnect()
+	if err := e.backend.Disconnect(); err != nil {
+		fmt.Fprintf(ctx.Output, "Warning: disconnect error: %v\n", err)
+	}
 	fmt.Fprintf(ctx.Output, "Disconnected from: %s\n", e.mprPath)
 	e.mprPath = ""
 	e.cache = nil