Add a lot of documentation

data_row.go

@@ -12,8 +12,11 @@ type DataRow struct {
 	Values [][]byte
 }
 
+// Backend identifies this message as sendable by the PostgreSQL backend.
 func (*DataRow) Backend() {}
 
+// Decode decodes src into dst. src must contain the complete message with the exception of the initial 1 byte message
+// type identifier and 4 byte message length.
 func (dst *DataRow) Decode(src []byte) error {
 	if len(src) < 2 {
 		return &invalidMessageFormatErr{messageType: "DataRow"}
@@ -59,6 +62,7 @@ func (dst *DataRow) Decode(src []byte) error {
 	return nil
 }
 
+// Encode encodes src into dst. dst will include the 1 byte message type identifier and the 4 byte message length.
 func (src *DataRow) Encode(dst []byte) []byte {
 	dst = append(dst, 'D')
 	sp := len(dst)
@@ -80,6 +84,7 @@ func (src *DataRow) Encode(dst []byte) []byte {
 	return dst
 }
 
+// MarshalJSON implements encoding/json.Marshaler.
 func (src *DataRow) MarshalJSON() ([]byte, error) {
 	formattedValues := make([]map[string]string, len(src.Values))
 	for i, v := range src.Values {