derived table and row number addition

qry_select.go

@@ -7,6 +7,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"slices"
 	"strconv"
 	"strings"
 
@@ -103,6 +104,7 @@ type (
 		First
 		All
 		Stringer
+		Bulder
 	}
 
 	RowScanner interface {
@@ -128,6 +130,10 @@ type (
 		AllTx(ctx context.Context, tx pgx.Tx, rows RowsCb) error
 	}
 
+	Bulder interface {
+		Build(needArgs bool) (qry string, args []any)
+	}
+
 	selectQry struct {
 		table   string
 		fields  []Field
@@ -291,6 +297,17 @@ func (q *selectQry) raw(prefixArgs []any) (string, []any) {
 }
 
 func (q *selectQry) String() string {
+	qry, _ := q.Build(false)
+	if q.debug {
+		fmt.Println("***")
+		fmt.Println(qry)
+		fmt.Printf("%+v\n", q.args)
+		fmt.Println("***")
+	}
+	return qry
+}
+
+func (q *selectQry) Build(needArgs bool) (qry string, args []any) {
 	sb := getSB()
 	defer putSB(sb)
 
@@ -356,14 +373,19 @@ func (q *selectQry) String() string {
 		sb.WriteString(strconv.Itoa(q.offset))
 	}
 
-	qry := sb.String()
+	qry = sb.String()
 	if q.debug {
 		fmt.Println("***")
 		fmt.Println(qry)
 		fmt.Printf("%+v\n", q.args)
 		fmt.Println("***")
 	}
-	return qry
+
+	if needArgs {
+		args = slices.Clone(q.args)
+	}
+
+	return
 }
 
 func (q *selectQry) averageLen() int {