@ -1,122 +1,269 @@
package mssql
import (
"context"
"database/sql"
"database/sql/driver"
"encoding/binary"
"errors"
"fmt"
"io"
"log"
"math"
"net"
"reflect"
"strings"
"time"
)
var driverInstance = & Driver { processQueryText : true }
var driverInstanceNoProcess = & Driver { processQueryText : false }
func init ( ) {
sql . Register ( "mssql" , & MssqlDriver { } )
sql . Register ( "mssql" , driverInstance )
sql . Register ( "sqlserver" , driverInstanceNoProcess )
createDialer = func ( p * connectParams ) dialer {
return tcpDialer { & net . Dialer { Timeout : p . dial_timeout , KeepAlive : p . keepAlive } }
}
}
// Abstract the dialer for testing and for non-TCP based connections.
type dialer interface {
Dial ( ctx context . Context , addr string ) ( net . Conn , error )
}
var createDialer func ( p * connectParams ) dialer
type tcpDialer struct {
nd * net . Dialer
}
func ( d tcpDialer ) Dial ( ctx context . Context , addr string ) ( net . Conn , error ) {
return d . nd . DialContext ( ctx , "tcp" , addr )
}
type Driver struct {
log optionalLogger
processQueryText bool
}
// OpenConnector opens a new connector. Useful to dial with a context.
func ( d * Driver ) OpenConnector ( dsn string ) ( * Connector , error ) {
params , err := parseConnectParams ( dsn )
if err != nil {
return nil , err
}
return & Connector {
params : params ,
driver : d ,
} , nil
}
func ( d * Driver ) Open ( dsn string ) ( driver . Conn , error ) {
return d . open ( context . Background ( ) , dsn )
}
// Connector holds the parsed DSN and is ready to make a new connection
// at any time.
//
// In the future, settings that cannot be passed through a string DSN
// may be set directly on the connector.
type Connector struct {
params connectParams
driver * Driver
}
type MssqlDriver struct {
log * log . Logger
// Connect to the server and return a TDS connection.
func ( c * Connector ) Connect ( ctx context . Context ) ( driver . Conn , error ) {
return c . driver . connect ( ctx , c . params )
}
func ( d * MssqlDriver ) SetLogger ( logger * log . Logger ) {
d . log = logger
// Driver underlying the Connector.
func ( c * Connector ) Driver ( ) driver . Driver {
return c . driver
}
func CheckBadConn ( err error ) error {
if err == io . EOF {
func SetLogger ( logger Logger ) {
driverInstance . SetLogger ( logger )
driverInstanceNoProcess . SetLogger ( logger )
}
func ( d * Driver ) SetLogger ( logger Logger ) {
d . log = optionalLogger { logger }
}
type Conn struct {
sess * tdsSession
transactionCtx context . Context
processQueryText bool
connectionGood bool
outs map [ string ] interface { }
}
func ( c * Conn ) checkBadConn ( err error ) error {
// this is a hack to address Issue #275
// we set connectionGood flag to false if
// error indicates that connection is not usable
// but we return actual error instead of ErrBadConn
// this will cause connection to stay in a pool
// but next request to this connection will return ErrBadConn
// it might be possible to revise this hack after
// https://github.com/golang/go/issues/20807
// is implemented
switch err {
case nil :
return nil
case io . EOF :
return driver . ErrBadConn
case driver . ErrBadConn :
// It is an internal programming error if driver.ErrBadConn
// is ever passed to this function. driver.ErrBadConn should
// only ever be returned in response to a *mssql.Conn.connectionGood == false
// check in the external facing API.
panic ( "driver.ErrBadConn in checkBadConn. This should not happen." )
}
switch e := err . ( type ) {
switch err . ( type ) {
case net . Error :
if e . Timeout ( ) {
return e
}
return driver . ErrBadConn
c . connectionGood = false
return err
case StreamError :
c . connectionGood = false
return err
default :
return err
}
}
type MssqlConn struct {
sess * tdsSession
func ( c * Conn ) clearOuts ( ) {
c . outs = nil
}
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
}
func ( c * Conn ) simpleProcessResp ( ctx context . Context ) error {
tokchan := make ( chan tokenStruct , 5 )
go processResponse ( c . sess , tokchan )
go processResponse ( ctx , c . sess , tokchan , c . outs )
c . clearOuts ( )
for tok := range tokchan {
switch token := tok . ( type ) {
case doneStruct :
if token . isError ( ) {
return c . checkBadConn ( token . getError ( ) )
}
case error :
return token
return c . checkBadConn ( token )
}
}
return nil
}
func ( c * MssqlConn ) Rollback ( ) error {
func ( c * Conn ) Commit ( ) error {
if ! c . connectionGood {
return driver . ErrBadConn
}
if err := c . sendCommitRequest ( ) ; err != nil {
return c . checkBadConn ( err )
}
return c . simpleProcessResp ( c . transactionCtx )
}
func ( c * Conn ) sendCommitRequest ( ) 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
if err := sendCommitXact ( c . sess . buf , headers , "" , 0 , 0 , "" ) ; err != nil {
if c . sess . logFlags & logErrors != 0 {
c . sess . log . Printf ( "Failed to send CommitXact with %v" , err )
}
c . connectionGood = false
return fmt . Errorf ( "Faild to send CommitXact: %v" , err )
}
return nil
}
func ( c * Conn ) Rollback ( ) error {
if ! c . connectionGood {
return driver . ErrBadConn
}
if err := c . sendRollbackRequest ( ) ; err != nil {
return c . checkBadConn ( err )
}
return c . simpleProcessResp ( c . transactionCtx )
}
tokchan := make ( chan tokenStruct , 5 )
go processResponse ( c . sess , tokchan )
for tok := range tokchan {
switch token := tok . ( type ) {
case error :
return token
func ( c * Conn ) sendRollbackRequest ( ) error {
headers := [ ] headerStruct {
{ hdrtype : dataStmHdrTransDescr ,
data : transDescrHdr { c . sess . tranid , 1 } . pack ( ) } ,
}
if err := sendRollbackXact ( c . sess . buf , headers , "" , 0 , 0 , "" ) ; err != nil {
if c . sess . logFlags & logErrors != 0 {
c . sess . log . Printf ( "Failed to send RollbackXact with %v" , err )
}
c . connectionGood = false
return fmt . Errorf ( "Failed to send RollbackXact: %v" , err )
}
return nil
}
func ( c * MssqlConn ) Begin ( ) ( driver . Tx , error ) {
func ( c * Conn ) Begin ( ) ( driver . Tx , error ) {
return c . begin ( context . Background ( ) , isolationUseCurrent )
}
func ( c * Conn ) begin ( ctx context . Context , tdsIsolation isoLevel ) ( tx driver . Tx , err error ) {
if ! c . connectionGood {
return nil , driver . ErrBadConn
}
err = c . sendBeginRequest ( ctx , tdsIsolation )
if err != nil {
return nil , c . checkBadConn ( err )
}
tx , err = c . processBeginResponse ( ctx )
if err != nil {
return nil , c . checkBadConn ( err )
}
return
}
func ( c * Conn ) sendBeginRequest ( ctx context . Context , tdsIsolation isoLevel ) error {
c . transactionCtx = ctx
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 )
if err := sendBeginXact ( c . sess . buf , headers , tdsIsolation , "" ) ; err != nil {
if c . sess . logFlags & logErrors != 0 {
c . sess . log . Printf ( "Failed to send BeginXact with %v" , err )
}
c . connectionGood = false
return fmt . Errorf ( "Failed to send BiginXant: %v" , err )
}
return nil
}
func ( c * Conn ) processBeginResponse ( ctx context . Context ) ( driver . Tx , error ) {
if err := c . simpleProcessResp ( ctx ) ; err != nil {
return nil , err
}
// successful BEGINXACT request will return sess.tranid
// for started transaction
return c , nil
}
func ( d * MssqlDriver ) Open ( dsn string ) ( driver . Conn , error ) {
func ( d * Driver ) open ( ctx context . Context , dsn string ) ( * Conn , error ) {
params , err := parseConnectParams ( dsn )
if err != nil {
return nil , err
}
return d . connect ( ctx , params )
}
sess , err := connect ( params )
// connect to the server, using the provided context for dialing only.
func ( d * Driver ) connect ( ctx context . Context , params connectParams ) ( * Conn , error ) {
sess , err := connect ( ctx , d . log , params )
if err != nil {
// main server failed, try fail-over partner
if params . failOverPartner == "" {
@ -128,24 +275,29 @@ func (d *MssqlDriver) Open(dsn string) (driver.Conn, error) {
params . port = params . failOverPort
}
sess , err = connect ( params )
sess , err = connect ( ctx , d . log , params )
if err != nil {
// fail-over partner also failed, now fail
return nil , err
}
}
conn := & MssqlConn { sess }
conn . sess . log = ( * Logger ) ( d . log )
conn := & Conn {
sess : sess ,
transactionCtx : context . Background ( ) ,
processQueryText : d . processQueryText ,
connectionGood : true ,
}
conn . sess . log = d . log
return conn , nil
}
func ( c * MssqlConn ) Close ( ) error {
func ( c * Conn ) Close ( ) error {
return c . sess . buf . transport . Close ( )
}
type Mssql Stmtstruct {
c * Mssql Conn
type Stmt struct {
c * Conn
query string
paramCount int
notifSub * queryNotifSub
@ -157,16 +309,30 @@ type queryNotifSub struct {
timeout uint32
}
func ( c * MssqlConn ) Prepare ( query string ) ( driver . Stmt , error ) {
q , paramCount := parseParams ( query )
return & MssqlStmt { c , q , paramCount , nil } , nil
func ( c * Conn ) Prepare ( query string ) ( driver . Stmt , error ) {
if ! c . connectionGood {
return nil , driver . ErrBadConn
}
if len ( query ) > 10 && strings . EqualFold ( query [ : 10 ] , "INSERTBULK" ) {
return c . prepareCopyIn ( query )
}
return c . prepareContext ( context . Background ( ) , query )
}
func ( c * Conn ) prepareContext ( ctx context . Context , query string ) ( * Stmt , error ) {
paramCount := - 1
if c . processQueryText {
query , paramCount = parseParams ( query )
}
return & Stmt { c , query , paramCount , nil } , nil
}
func ( s * MssqlStmt ) Close ( ) error {
func ( s * Stmt ) Close ( ) error {
return nil
}
func ( s * MssqlStmt ) SetQueryNotification ( id , options string , timeout time . Duration ) {
func ( s * Stmt ) SetQueryNotification ( id , options string , timeout time . Duration ) {
to := uint32 ( timeout / time . Second )
if to < 1 {
to = 1
@ -174,183 +340,273 @@ func (s *MssqlStmt) SetQueryNotification(id, options string, timeout time.Durati
s . notifSub = & queryNotifSub { id , options , to }
}
func ( s * Mssql Stmt) NumInput ( ) int {
func ( s * Stmt ) NumInput ( ) int {
return s . paramCount
}
func ( s * Mssql Stmt) sendQuery ( args [ ] driver . Value ) ( err error ) {
func ( s * Stmt ) sendQuery ( args [ ] named 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 ) ) )
}
headers = append ( headers ,
headerStruct {
hdrtype : dataStmHdrQueryNotif ,
data : queryNotifHdr {
s . notifSub . msgText ,
s . notifSub . options ,
s . notifSub . timeout ,
} . pack ( ) ,
} )
}
// no need to check number of parameters here, it is checked by database/sql
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 [ i ] . Name ) > 0 {
s . c . sess . log . Printf ( "\t@%s\t%v\n" , args [ i ] . Name , args [ i ] . Value )
} else {
s . c . sess . log . Printf ( "\t@p%d\t%v\n" , i + 1 , args [ i ] . Value )
}
}
}
if len ( args ) == 0 {
if err = sendSqlBatch72 ( s . c . sess . buf , s . query , headers ) ; err != nil {
if s . c . sess . tranid != 0 {
return err
if s . c . sess . logFlags & logErrors != 0 {
s . c . sess . log . Printf ( "Failed to send SqlBatch with %v" , err )
}
return CheckBadConn ( err )
s . c . connectionGood = false
return fmt . Errorf ( "failed to send SQL Batch: %v" , 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 )
proc := Sp_ExecuteSql
var params [ ] Param
if isProc ( s . query ) {
proc . name = s . query
params , _ , err = s . makeRPCParams ( args , 0 )
} else {
var decls [ ] string
params , decls , err = s . makeRPCParams ( args , 2 )
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
params [ 0 ] = makeStrParam ( s . query )
params [ 1 ] = makeStrParam ( strings . Join ( decls , "," ) )
}
if err = sendRpc ( s . c . sess . buf , headers , Sp_ExecuteSql , 0 , params ) ; err != nil {
if s . c . sess . tranid != 0 {
return err
if err = sendRpc ( s . c . sess . buf , headers , proc , 0 , params ) ; err != nil {
if s . c . sess . logFlags & logErrors != 0 {
s . c . sess . log . Printf ( "Failed to send Rpc with %v" , err )
}
return CheckBadConn ( err )
s . c . connectionGood = false
return fmt . Errorf ( "Failed to send RPC: %v" , err )
}
}
return
}
func ( s * MssqlStmt ) Query ( args [ ] driver . Value ) ( res driver . Rows , err error ) {
// isProc takes the query text in s and determines if it is a stored proc name
// or SQL text.
func isProc ( s string ) bool {
if len ( s ) == 0 {
return false
}
if s [ 0 ] == '[' && s [ len ( s ) - 1 ] == ']' && strings . ContainsAny ( s , "\n\r" ) == false {
return true
}
return ! strings . ContainsAny ( s , " \t\n\r;" )
}
func ( s * Stmt ) makeRPCParams ( args [ ] namedValue , offset int ) ( [ ] Param , [ ] string , error ) {
var err error
params := make ( [ ] Param , len ( args ) + offset )
decls := make ( [ ] string , len ( args ) )
for i , val := range args {
params [ i + offset ] , err = s . makeParam ( val . Value )
if err != nil {
return nil , nil , err
}
var name string
if len ( val . Name ) > 0 {
name = "@" + val . Name
} else {
name = fmt . Sprintf ( "@p%d" , val . Ordinal )
}
params [ i + offset ] . Name = name
decls [ i ] = fmt . Sprintf ( "%s %s" , name , makeDecl ( params [ i + offset ] . ti ) )
}
return params , decls , nil
}
type namedValue struct {
Name string
Ordinal int
Value driver . Value
}
func convertOldArgs ( args [ ] driver . Value ) [ ] namedValue {
list := make ( [ ] namedValue , len ( args ) )
for i , v := range args {
list [ i ] = namedValue {
Ordinal : i + 1 ,
Value : v ,
}
}
return list
}
func ( s * Stmt ) Query ( args [ ] driver . Value ) ( driver . Rows , error ) {
return s . queryContext ( context . Background ( ) , convertOldArgs ( args ) )
}
func ( s * Stmt ) queryContext ( ctx context . Context , args [ ] namedValue ) ( rows driver . Rows , err error ) {
if ! s . c . connectionGood {
return nil , driver . ErrBadConn
}
if err = s . sendQuery ( args ) ; err != nil {
return
return nil , s . c . checkBadConn ( err )
}
return s . processQueryResponse ( ctx )
}
func ( s * Stmt ) processQueryResponse ( ctx context . Context ) ( res driver . Rows , err error ) {
tokchan := make ( chan tokenStruct , 5 )
go processResponse ( s . c . sess , tokchan )
ctx , cancel := context . WithCancel ( ctx )
go processResponse ( ctx , s . c . sess , tokchan , s . c . outs )
s . c . clearOuts ( )
// process metadata
var cols [ ] string
var cols [ ] columnStruct
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:
// B y ignoring DONE token we effectively
// skip empty result-sets.
// This improves results in queri es 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
}
cols = token
break loop
case error :
if s . c . sess . tranid != 0 {
return nil , token
case doneStruct :
if token . isError ( ) {
return nil , s . c . checkBadConn ( token . getError ( ) )
}
return nil , CheckBadConn ( token )
case error :
return nil , s . c . checkBadConn ( token )
}
}
return & MssqlRows { sess : s . c . sess , tokchan : tokchan , cols : cols } , nil
res = & Rows { stmt : s , tokchan : tokchan , cols : cols , cancel : cancel }
return
}
func ( s * MssqlStmt ) Exec ( args [ ] driver . Value ) ( res driver . Result , err error ) {
func ( s * Stmt ) Exec ( args [ ] driver . Value ) ( driver . Result , error ) {
return s . exec ( context . Background ( ) , convertOldArgs ( args ) )
}
func ( s * Stmt ) exec ( ctx context . Context , args [ ] namedValue ) ( res driver . Result , err error ) {
if ! s . c . connectionGood {
return nil , driver . ErrBadConn
}
if err = s . sendQuery ( args ) ; err != nil {
return
return nil , s . c . checkBadConn ( err )
}
if res , err = s . processExec ( ctx ) ; err != nil {
return nil , s . c . checkBadConn ( err )
}
return
}
func ( s * Stmt ) processExec ( ctx context . Context ) ( res driver . Result , err error ) {
tokchan := make ( chan tokenStruct , 5 )
go processResponse ( s . c . sess , tokchan )
go processResponse ( ctx , s . c . sess , tokchan , s . c . outs )
s . c . clearOuts ( )
var rowCount int64
for token := range tokchan {
switch token := token . ( type ) {
case doneInProcStruct :
if token . Status & doneCount != 0 {
rowCount = int64 ( token . RowCount )
rowCount + =int64 ( token . RowCount )
}
case doneStruct :
if token . Status & doneCount != 0 {
rowCount = int64 ( token . RowCount )
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
if token . isError ( ) {
return nil , token . getError ( )
}
return nil , CheckBadConn ( token )
case error :
return nil , token
}
}
return & Mssql Result{ s . c , rowCount } , nil
return & Result { s . c , rowCount } , nil
}
type Mssql Rowsstruct {
sess * tdsSession
cols [ ] string
type Rows struct {
stmt * Stmt
cols [ ] columnStruct
tokchan chan tokenStruct
nextCols [ ] string
nextCols [ ] columnStruct
cancel func ( )
}
func ( rc * MssqlRows ) Close ( ) error {
func ( rc * Rows ) Close ( ) error {
rc . cancel ( )
for _ = range rc . tokchan {
}
rc . tokchan = nil
return nil
}
func ( rc * MssqlRows ) Columns ( ) ( res [ ] string ) {
return rc . cols
func ( rc * Rows ) Columns ( ) ( res [ ] string ) {
res = make ( [ ] string , len ( rc . cols ) )
for i , col := range rc . cols {
res [ i ] = col . ColName
}
return
}
func ( rc * MssqlRows ) Next ( dest [ ] driver . Value ) ( err error ) {
func ( rc * Rows ) Next ( dest [ ] driver . Value ) error {
if ! rc . stmt . c . connectionGood {
return driver . ErrBadConn
}
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
rc . nextCols = tokdata
return io . EOF
case [ ] interface { } :
for i := range dest {
dest [ i ] = tokdata [ i ]
}
return nil
case doneStruct :
if tokdata . isError ( ) {
return rc . stmt . c . checkBadConn ( tokdata . getError ( ) )
}
case error :
return tokdata
return rc . stmt . c . checkBadConn ( tokdata )
}
}
return io . EOF
}
func ( rc * Mssql Rows) HasNextResultSet ( ) bool {
func ( rc * Rows ) HasNextResultSet ( ) bool {
return rc . nextCols != nil
}
func ( rc * Mssql Rows) NextResultSet ( ) error {
func ( rc * Rows ) NextResultSet ( ) error {
rc . cols = rc . nextCols
rc . nextCols = nil
if rc . cols == nil {
@ -359,11 +615,69 @@ func (rc *MssqlRows) NextResultSet() error {
return nil
}
func ( s * MssqlStmt ) makeParam ( val driver . Value ) ( res Param , err error ) {
// It should return
// the value type that can be used to scan types into. For example, the database
// column type "bigint" this should return "reflect.TypeOf(int64(0))".
func ( r * Rows ) ColumnTypeScanType ( index int ) reflect . Type {
return makeGoLangScanType ( r . cols [ index ] . ti )
}
// RowsColumnTypeDatabaseTypeName may be implemented by Rows. It should return the
// database system type name without the length. Type names should be uppercase.
// Examples of returned types: "VARCHAR", "NVARCHAR", "VARCHAR2", "CHAR", "TEXT",
// "DECIMAL", "SMALLINT", "INT", "BIGINT", "BOOL", "[]BIGINT", "JSONB", "XML",
// "TIMESTAMP".
func ( r * Rows ) ColumnTypeDatabaseTypeName ( index int ) string {
return makeGoLangTypeName ( r . cols [ index ] . ti )
}
// RowsColumnTypeLength may be implemented by Rows. It should return the length
// of the column type if the column is a variable length type. If the column is
// not a variable length type ok should return false.
// If length is not limited other than system limits, it should return math.MaxInt64.
// The following are examples of returned values for various types:
// TEXT (math.MaxInt64, true)
// varchar(10) (10, true)
// nvarchar(10) (10, true)
// decimal (0, false)
// int (0, false)
// bytea(30) (30, true)
func ( r * Rows ) ColumnTypeLength ( index int ) ( int64 , bool ) {
return makeGoLangTypeLength ( r . cols [ index ] . ti )
}
// It should return
// the precision and scale for decimal types. If not applicable, ok should be false.
// The following are examples of returned values for various types:
// decimal(38, 4) (38, 4, true)
// int (0, 0, false)
// decimal (math.MaxInt64, math.MaxInt64, true)
func ( r * Rows ) ColumnTypePrecisionScale ( index int ) ( int64 , int64 , bool ) {
return makeGoLangTypePrecisionScale ( r . cols [ index ] . ti )
}
// The nullable value should
// be true if it is known the column may be null, or false if the column is known
// to be not nullable.
// If the column nullability is unknown, ok should be false.
func ( r * Rows ) ColumnTypeNullable ( index int ) ( nullable , ok bool ) {
nullable = r . cols [ index ] . Flags & colFlagNullable != 0
ok = true
return
}
func makeStrParam ( val string ) ( res Param ) {
res . ti . TypeId = typeNVarChar
res . buffer = str2ucs2 ( val )
res . ti . Size = len ( res . buffer )
return
}
func ( s * Stmt ) makeParam ( val driver . Value ) ( res Param , err error ) {
if val == nil {
res . ti . TypeId = typeNVarChar
res . ti . TypeId = typeNull
res . buffer = nil
res . ti . Size = 2
res . ti . Size = 0
return
}
switch val := val . ( type ) {
@ -382,9 +696,7 @@ func (s *MssqlStmt) makeParam(val driver.Value) (res Param, err error) {
res . ti . Size = len ( val )
res . buffer = val
case string :
res . ti . TypeId = typeNVarChar
res . buffer = str2ucs2 ( val )
res . ti . Size = len ( res . buffer )
res = makeStrParam ( val )
case bool :
res . ti . TypeId = typeBitN
res . ti . Size = 1
@ -425,22 +737,21 @@ func (s *MssqlStmt) makeParam(val driver.Value) (res Param, err error) {
binary . LittleEndian . PutUint32 ( res . buffer [ 4 : 8 ] , uint32 ( tm ) )
}
default :
err = fmt . Errorf ( "mssql: unknown type for %T" , val )
return
return s . makeParamExtra ( val )
}
return
}
type Mssql Resultstruct {
c * Mssql Conn
type Result struct {
c * Conn
rowsAffected int64
}
func ( r * Mssql Result) RowsAffected ( ) ( int64 , error ) {
func ( r * Result ) RowsAffected ( ) ( int64 , error ) {
return r . rowsAffected , nil
}
func ( r * Mssql Result) LastInsertId ( ) ( int64 , error ) {
func ( r * Result ) LastInsertId ( ) ( int64 , error ) {
s , err := r . c . Prepare ( "select cast(@@identity as bigint)" )
if err != nil {
return 0 , err
Antoine GIRARD
6 years ago
committed by
Lunny Xiao