gitea-1120-rc1/vendor/github.com/denisenkom/go-mssqldb/mssql.go

465 lines
9.8 KiB
Go

package mssql
import (
"database/sql"
"database/sql/driver"
"encoding/binary"
"errors"
"fmt"
"io"
"log"
"math"
"net"
"strings"
"time"
)
func init() {
sql.Register("mssql", &MssqlDriver{})
}
type MssqlDriver struct {
log *log.Logger
}
func (d *MssqlDriver) SetLogger(logger *log.Logger) {
d.log = logger
}
func CheckBadConn(err error) error {
if err == io.EOF {
return driver.ErrBadConn
}
switch e := err.(type) {
case net.Error:
if e.Timeout() {
return e
}
return driver.ErrBadConn
default:
return err
}
}
type MssqlConn struct {
sess *tdsSession
}
func (c *MssqlConn) Commit() error {
headers := []headerStruct{
{hdrtype: dataStmHdrTransDescr,
data: transDescrHdr{c.sess.tranid, 1}.pack()},
}
if err := sendCommitXact(c.sess.buf, headers, "", 0, 0, ""); err != nil {
return err
}
tokchan := make(chan tokenStruct, 5)
go processResponse(c.sess, tokchan)
for tok := range tokchan {
switch token := tok.(type) {
case error:
return token
}
}
return nil
}
func (c *MssqlConn) Rollback() error {
headers := []headerStruct{
{hdrtype: dataStmHdrTransDescr,
data: transDescrHdr{c.sess.tranid, 1}.pack()},
}
if err := sendRollbackXact(c.sess.buf, headers, "", 0, 0, ""); err != nil {
return err
}
tokchan := make(chan tokenStruct, 5)
go processResponse(c.sess, tokchan)
for tok := range tokchan {
switch token := tok.(type) {
case error:
return token
}
}
return nil
}
func (c *MssqlConn) Begin() (driver.Tx, error) {
headers := []headerStruct{
{hdrtype: dataStmHdrTransDescr,
data: transDescrHdr{0, 1}.pack()},
}
if err := sendBeginXact(c.sess.buf, headers, 0, ""); err != nil {
return nil, CheckBadConn(err)
}
tokchan := make(chan tokenStruct, 5)
go processResponse(c.sess, tokchan)
for tok := range tokchan {
switch token := tok.(type) {
case error:
if c.sess.tranid != 0 {
return nil, token
}
return nil, CheckBadConn(token)
}
}
// successful BEGINXACT request will return sess.tranid
// for started transaction
return c, nil
}
func (d *MssqlDriver) Open(dsn string) (driver.Conn, error) {
params, err := parseConnectParams(dsn)
if err != nil {
return nil, err
}
sess, err := connect(params)
if err != nil {
// main server failed, try fail-over partner
if params.failOverPartner == "" {
return nil, err
}
params.host = params.failOverPartner
if params.failOverPort != 0 {
params.port = params.failOverPort
}
sess, err = connect(params)
if err != nil {
// fail-over partner also failed, now fail
return nil, err
}
}
conn := &MssqlConn{sess}
conn.sess.log = (*Logger)(d.log)
return conn, nil
}
func (c *MssqlConn) Close() error {
return c.sess.buf.transport.Close()
}
type MssqlStmt struct {
c *MssqlConn
query string
paramCount int
notifSub *queryNotifSub
}
type queryNotifSub struct {
msgText string
options string
timeout uint32
}
func (c *MssqlConn) Prepare(query string) (driver.Stmt, error) {
q, paramCount := parseParams(query)
return &MssqlStmt{c, q, paramCount, nil}, nil
}
func (s *MssqlStmt) Close() error {
return nil
}
func (s *MssqlStmt) SetQueryNotification(id, options string, timeout time.Duration) {
to := uint32(timeout / time.Second)
if to < 1 {
to = 1
}
s.notifSub = &queryNotifSub{id, options, to}
}
func (s *MssqlStmt) NumInput() int {
return s.paramCount
}
func (s *MssqlStmt) sendQuery(args []driver.Value) (err error) {
headers := []headerStruct{
{hdrtype: dataStmHdrTransDescr,
data: transDescrHdr{s.c.sess.tranid, 1}.pack()},
}
if s.notifSub != nil {
headers = append(headers, headerStruct{hdrtype: dataStmHdrQueryNotif,
data: queryNotifHdr{s.notifSub.msgText, s.notifSub.options, s.notifSub.timeout}.pack()})
}
if len(args) != s.paramCount {
return errors.New(fmt.Sprintf("sql: expected %d parameters, got %d", s.paramCount, len(args)))
}
if s.c.sess.logFlags&logSQL != 0 {
s.c.sess.log.Println(s.query)
}
if s.c.sess.logFlags&logParams != 0 && len(args) > 0 {
for i := 0; i < len(args); i++ {
s.c.sess.log.Printf("\t@p%d\t%v\n", i+1, args[i])
}
}
if len(args) == 0 {
if err = sendSqlBatch72(s.c.sess.buf, s.query, headers); err != nil {
if s.c.sess.tranid != 0 {
return err
}
return CheckBadConn(err)
}
} else {
params := make([]Param, len(args)+2)
decls := make([]string, len(args))
params[0], err = s.makeParam(s.query)
if err != nil {
return
}
for i, val := range args {
params[i+2], err = s.makeParam(val)
if err != nil {
return
}
name := fmt.Sprintf("@p%d", i+1)
params[i+2].Name = name
decls[i] = fmt.Sprintf("%s %s", name, makeDecl(params[i+2].ti))
}
params[1], err = s.makeParam(strings.Join(decls, ","))
if err != nil {
return
}
if err = sendRpc(s.c.sess.buf, headers, Sp_ExecuteSql, 0, params); err != nil {
if s.c.sess.tranid != 0 {
return err
}
return CheckBadConn(err)
}
}
return
}
func (s *MssqlStmt) Query(args []driver.Value) (res driver.Rows, err error) {
if err = s.sendQuery(args); err != nil {
return
}
tokchan := make(chan tokenStruct, 5)
go processResponse(s.c.sess, tokchan)
// process metadata
var cols []string
loop:
for tok := range tokchan {
switch token := tok.(type) {
// by ignoring DONE token we effectively
// skip empty result-sets
// this improves results in queryes like that:
// set nocount on; select 1
// see TestIgnoreEmptyResults test
//case doneStruct:
//break loop
case []columnStruct:
cols = make([]string, len(token))
for i, col := range token {
cols[i] = col.ColName
}
break loop
case error:
if s.c.sess.tranid != 0 {
return nil, token
}
return nil, CheckBadConn(token)
}
}
return &MssqlRows{sess: s.c.sess, tokchan: tokchan, cols: cols}, nil
}
func (s *MssqlStmt) Exec(args []driver.Value) (res driver.Result, err error) {
if err = s.sendQuery(args); err != nil {
return
}
tokchan := make(chan tokenStruct, 5)
go processResponse(s.c.sess, tokchan)
var rowCount int64
for token := range tokchan {
switch token := token.(type) {
case doneInProcStruct:
if token.Status&doneCount != 0 {
rowCount = int64(token.RowCount)
}
case doneStruct:
if token.Status&doneCount != 0 {
rowCount = int64(token.RowCount)
}
case error:
if s.c.sess.logFlags&logErrors != 0 {
s.c.sess.log.Println("got error:", token)
}
if s.c.sess.tranid != 0 {
return nil, token
}
return nil, CheckBadConn(token)
}
}
return &MssqlResult{s.c, rowCount}, nil
}
type MssqlRows struct {
sess *tdsSession
cols []string
tokchan chan tokenStruct
nextCols []string
}
func (rc *MssqlRows) Close() error {
for _ = range rc.tokchan {
}
rc.tokchan = nil
return nil
}
func (rc *MssqlRows) Columns() (res []string) {
return rc.cols
}
func (rc *MssqlRows) Next(dest []driver.Value) (err error) {
if rc.nextCols != nil {
return io.EOF
}
for tok := range rc.tokchan {
switch tokdata := tok.(type) {
case []columnStruct:
cols := make([]string, len(tokdata))
for i, col := range tokdata {
cols[i] = col.ColName
}
rc.nextCols = cols
return io.EOF
case []interface{}:
for i := range dest {
dest[i] = tokdata[i]
}
return nil
case error:
return tokdata
}
}
return io.EOF
}
func (rc *MssqlRows) HasNextResultSet() bool {
return rc.nextCols != nil
}
func (rc *MssqlRows) NextResultSet() error {
rc.cols = rc.nextCols
rc.nextCols = nil
if rc.cols == nil {
return io.EOF
}
return nil
}
func (s *MssqlStmt) makeParam(val driver.Value) (res Param, err error) {
if val == nil {
res.ti.TypeId = typeNVarChar
res.buffer = nil
res.ti.Size = 2
return
}
switch val := val.(type) {
case int64:
res.ti.TypeId = typeIntN
res.buffer = make([]byte, 8)
res.ti.Size = 8
binary.LittleEndian.PutUint64(res.buffer, uint64(val))
case float64:
res.ti.TypeId = typeFltN
res.ti.Size = 8
res.buffer = make([]byte, 8)
binary.LittleEndian.PutUint64(res.buffer, math.Float64bits(val))
case []byte:
res.ti.TypeId = typeBigVarBin
res.ti.Size = len(val)
res.buffer = val
case string:
res.ti.TypeId = typeNVarChar
res.buffer = str2ucs2(val)
res.ti.Size = len(res.buffer)
case bool:
res.ti.TypeId = typeBitN
res.ti.Size = 1
res.buffer = make([]byte, 1)
if val {
res.buffer[0] = 1
}
case time.Time:
if s.c.sess.loginAck.TDSVersion >= verTDS73 {
res.ti.TypeId = typeDateTimeOffsetN
res.ti.Scale = 7
res.ti.Size = 10
buf := make([]byte, 10)
res.buffer = buf
days, ns := dateTime2(val)
ns /= 100
buf[0] = byte(ns)
buf[1] = byte(ns >> 8)
buf[2] = byte(ns >> 16)
buf[3] = byte(ns >> 24)
buf[4] = byte(ns >> 32)
buf[5] = byte(days)
buf[6] = byte(days >> 8)
buf[7] = byte(days >> 16)
_, offset := val.Zone()
offset /= 60
buf[8] = byte(offset)
buf[9] = byte(offset >> 8)
} else {
res.ti.TypeId = typeDateTimeN
res.ti.Size = 8
res.buffer = make([]byte, 8)
ref := time.Date(1900, 1, 1, 0, 0, 0, 0, time.UTC)
dur := val.Sub(ref)
days := dur / (24 * time.Hour)
tm := (300 * (dur % (24 * time.Hour))) / time.Second
binary.LittleEndian.PutUint32(res.buffer[0:4], uint32(days))
binary.LittleEndian.PutUint32(res.buffer[4:8], uint32(tm))
}
default:
err = fmt.Errorf("mssql: unknown type for %T", val)
return
}
return
}
type MssqlResult struct {
c *MssqlConn
rowsAffected int64
}
func (r *MssqlResult) RowsAffected() (int64, error) {
return r.rowsAffected, nil
}
func (r *MssqlResult) LastInsertId() (int64, error) {
s, err := r.c.Prepare("select cast(@@identity as bigint)")
if err != nil {
return 0, err
}
defer s.Close()
rows, err := s.Query(nil)
if err != nil {
return 0, err
}
defer rows.Close()
dest := make([]driver.Value, 1)
err = rows.Next(dest)
if err != nil {
return 0, err
}
if dest[0] == nil {
return -1, errors.New("There is no generated identity value")
}
lastInsertId := dest[0].(int64)
return lastInsertId, nil
}