Add pgtype GenericText and GenericBinary

Rows.Values uses this for unknown types.

pgtype/generic_binary.go

@@ -0,0 +1,29 @@
+package pgtype
+
+import (
+	"io"
+)
+
+// GenericBinary is a placeholder for binary format values that no other type exists
+// to handle.
+type GenericBinary Bytea
+
+func (dst *GenericBinary) Set(src interface{}) error {
+	return (*Bytea)(dst).Set(src)
+}
+
+func (dst *GenericBinary) Get() interface{} {
+	return (*Bytea)(dst).Get()
+}
+
+func (src *GenericBinary) AssignTo(dst interface{}) error {
+	return (*Bytea)(src).AssignTo(dst)
+}
+
+func (dst *GenericBinary) DecodeBinary(src []byte) error {
+	return (*Bytea)(dst).DecodeBinary(src)
+}
+
+func (src GenericBinary) EncodeBinary(w io.Writer) (bool, error) {
+	return (Bytea)(src).EncodeBinary(w)
+}

pgtype/generic_text.go

@@ -0,0 +1,29 @@
+package pgtype
+
+import (
+	"io"
+)
+
+// GenericText is a placeholder for text format values that no other type exists
+// to handle.
+type GenericText Text
+
+func (dst *GenericText) Set(src interface{}) error {
+	return (*Text)(dst).Set(src)
+}
+
+func (dst *GenericText) Get() interface{} {
+	return (*Text)(dst).Get()
+}
+
+func (src *GenericText) AssignTo(dst interface{}) error {
+	return (*Text)(src).AssignTo(dst)
+}
+
+func (dst *GenericText) DecodeText(src []byte) error {
+	return (*Text)(dst).DecodeText(src)
+}
+
+func (src GenericText) EncodeText(w io.Writer) (bool, error) {
+	return (Text)(src).EncodeText(w)
+}

query.go

@@ -325,16 +325,11 @@ func (rows *Rows) Values() ([]interface{}, error) {
 			continue
 		}
 
-		pgVal := rows.conn.oidPgtypeValues[vr.Type().DataType].(pgtype.TextDecoder)
-		if pgVal == nil {
-			panic("need GenericText or GenericBinary")
-		}
-
 		switch vr.Type().FormatCode {
 		case TextFormatCode:
 			decoder := rows.conn.oidPgtypeValues[vr.Type().DataType].(pgtype.TextDecoder)
 			if decoder == nil {
-				panic("need GenericText")
+				decoder = &pgtype.GenericText{}
 			}
 			err := decoder.DecodeText(vr.bytes())
 			if err != nil {
@@ -344,7 +339,7 @@ func (rows *Rows) Values() ([]interface{}, error) {
 		case BinaryFormatCode:
 			decoder := rows.conn.oidPgtypeValues[vr.Type().DataType].(pgtype.BinaryDecoder)
 			if decoder == nil {
-				panic("need GenericBinary")
+				decoder = &pgtype.GenericBinary{}
 			}
 			err := decoder.DecodeBinary(vr.bytes())
 			if err != nil {