pgx uses pgconn.CommandTag instead of own definition

copy_from.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"io"
 
+	"github.com/jackc/pgx/pgconn"
 	"github.com/jackc/pgx/pgio"
 	"github.com/jackc/pgx/pgproto3"
 	"github.com/pkg/errors"
@@ -284,13 +285,13 @@ func (c *Conn) CopyFrom(tableName Identifier, columnNames []string, rowSrc CopyF
 }
 
 // CopyFromReader uses the PostgreSQL textual format of the copy protocol
-func (c *Conn) CopyFromReader(r io.Reader, sql string) (CommandTag, error) {
+func (c *Conn) CopyFromReader(r io.Reader, sql string) (pgconn.CommandTag, error) {
 	if err := c.sendSimpleQuery(sql); err != nil {
-		return "", err
+		return nil, err
 	}
 
 	if err := c.readUntilCopyInResponse(); err != nil {
-		return "", err
+		return nil, err
 	}
 	buf := c.wbuf
 
@@ -305,7 +306,7 @@ func (c *Conn) CopyFromReader(r io.Reader, sql string) (CommandTag, error) {
 		pgio.SetInt32(buf[sp:], int32(n+4))
 
 		if _, err := c.pgConn.Conn().Write(buf); err != nil {
-			return "", err
+			return nil, err
 		}
 	}
 
@@ -314,25 +315,25 @@ func (c *Conn) CopyFromReader(r io.Reader, sql string) (CommandTag, error) {
 	buf = pgio.AppendInt32(buf, 4)
 
 	if _, err := c.pgConn.Conn().Write(buf); err != nil {
-		return "", err
+		return nil, err
 	}
 
 	for {
 		msg, err := c.rxMsg()
 		if err != nil {
-			return "", err
+			return nil, err
 		}
 
 		switch msg := msg.(type) {
 		case *pgproto3.ReadyForQuery:
 			c.rxReadyForQuery(msg)
-			return "", err
+			return nil, err
 		case *pgproto3.CommandComplete:
-			return CommandTag(msg.CommandTag), nil
+			return pgconn.CommandTag(msg.CommandTag), nil
 		case *pgproto3.ErrorResponse:
-			return "", c.rxErrorResponse(msg)
+			return nil, c.rxErrorResponse(msg)
 		default:
-			return "", c.processContextFreeMsg(msg)
+			return nil, c.processContextFreeMsg(msg)
 		}
 	}
 }