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// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
//
// Copyright 2012 The Go-MySQL-Driver Authors. All rights reserved.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at http://mozilla.org/MPL/2.0/.
package mysql
import (
"database/sql/driver"
"io"
)
type mysqlField struct {
tableName string
name string
flags fieldFlag
fieldType byte
decimals byte
}
type resultSet struct {
columns []mysqlField
done bool
}
type mysqlRows struct {
mc *mysqlConn
rs resultSet
}
type binaryRows struct {
mysqlRows
// stmtCols is a pointer to the statement's cached columns for different
// result sets.
stmtCols *[][]mysqlField
// i is a number of the current result set. It is used to fetch proper
// columns from stmtCols.
i int
}
type textRows struct {
mysqlRows
}
func (rows *mysqlRows) Columns() []string {
columns := make([]string, len(rows.rs.columns))
if rows.mc != nil && rows.mc.cfg.ColumnsWithAlias {
for i := range columns {
if tableName := rows.rs.columns[i].tableName; len(tableName) > 0 {
columns[i] = tableName + "." + rows.rs.columns[i].name
} else {
columns[i] = rows.rs.columns[i].name
}
}
} else {
for i := range columns {
columns[i] = rows.rs.columns[i].name
}
}
return columns
}
func (rows *mysqlRows) Close() (err error) {
mc := rows.mc
if mc == nil {
return nil
}
if mc.netConn == nil {
return ErrInvalidConn
}
// Remove unread packets from stream
if !rows.rs.done {
err = mc.readUntilEOF()
}
if err == nil {
if err = mc.discardResults(); err != nil {
return err
}
}
rows.mc = nil
return err
}
func (rows *mysqlRows) HasNextResultSet() (b bool) {
if rows.mc == nil {
return false
}
return rows.mc.status&statusMoreResultsExists != 0
}
func (rows *mysqlRows) nextResultSet() (int, error) {
if rows.mc == nil {
return 0, io.EOF
}
if rows.mc.netConn == nil {
return 0, ErrInvalidConn
}
// Remove unread packets from stream
if !rows.rs.done {
if err := rows.mc.readUntilEOF(); err != nil {
return 0, err
}
rows.rs.done = true
}
if !rows.HasNextResultSet() {
rows.mc = nil
return 0, io.EOF
}
rows.rs = resultSet{}
return rows.mc.readResultSetHeaderPacket()
}
func (rows *mysqlRows) nextNotEmptyResultSet() (int, error) {
for {
resLen, err := rows.nextResultSet()
if err != nil {
return 0, err
}
if resLen > 0 {
return resLen, nil
}
rows.rs.done = true
}
}
func (rows *binaryRows) NextResultSet() (err error) {
resLen, err := rows.nextNotEmptyResultSet()
if err != nil {
return err
}
// get columns, if not cached, read them and cache them.
if rows.i >= len(*rows.stmtCols) {
rows.rs.columns, err = rows.mc.readColumns(resLen)
*rows.stmtCols = append(*rows.stmtCols, rows.rs.columns)
} else {
rows.rs.columns = (*rows.stmtCols)[rows.i]
if err := rows.mc.readUntilEOF(); err != nil {
return err
}
}
rows.i++
return nil
}
func (rows *binaryRows) Next(dest []driver.Value) error {
if mc := rows.mc; mc != nil {
if mc.netConn == nil {
return ErrInvalidConn
}
// Fetch next row from stream
return rows.readRow(dest)
}
return io.EOF
}
func (rows *textRows) NextResultSet() (err error) {
resLen, err := rows.nextNotEmptyResultSet()
if err != nil {
return err
}
rows.rs.columns, err = rows.mc.readColumns(resLen)
return err
}
func (rows *textRows) Next(dest []driver.Value) error {
if mc := rows.mc; mc != nil {
if mc.netConn == nil {
return ErrInvalidConn
}
// Fetch next row from stream
return rows.readRow(dest)
}
return io.EOF
}
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