addressing the comments

add copy methods to the Tx struct

tx.go

@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"context"
 	"fmt"
+	"io"
 	"time"
 
 	"github.com/pkg/errors"
@@ -237,6 +238,24 @@ func (tx *Tx) CopyFrom(tableName Identifier, columnNames []string, rowSrc CopyFr
 	return tx.conn.CopyFrom(tableName, columnNames, rowSrc)
 }
 
+// CopyFromReader delegates to the underlying *Conn
+func (tx *Tx) CopyFromReader(r io.Reader, sql string) error {
+	if tx.status != TxStatusInProgress {
+		return ErrTxClosed
+	}
+
+	return tx.conn.CopyFromReader(r, sql)
+}
+
+// CopyToWriter delegates to the underlying *Conn
+func (tx *Tx) CopyToWriter(w io.Writer, sql string, args ...interface{}) error {
+	if tx.status != TxStatusInProgress {
+		return ErrTxClosed
+	}
+
+	return tx.conn.CopyToWriter(w, sql, args...)
+}
+
 // Status returns the status of the transaction from the set of
 // pgx.TxStatus* constants.
 func (tx *Tx) Status() int8 {