/
packageCurOpen.go
117 lines (94 loc) · 2.27 KB
/
packageCurOpen.go
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// SPDX-FileCopyrightText: 2020 SAP SE
// SPDX-FileCopyrightText: 2021 SAP SE
// SPDX-FileCopyrightText: 2022 SAP SE
// SPDX-FileCopyrightText: 2023 SAP SE
//
// SPDX-License-Identifier: Apache-2.0
package tds
import "fmt"
//go:generate stringer -type=CursorOStatus
// CursorOStatus is the type for a value indicating the status of
// a cursor when opening it.
type CursorOStatus uint
const (
TDS_CUR_OSTAT_UNUSED CursorOStatus = iota
TDS_CUR_OSTAT_HASARGS
TDS_CUR_CONSEC_UPDS
)
var _ Package = (*CurOpenPackage)(nil)
// CurOpenPackage is used to open a declared cursor.
type CurOpenPackage struct {
CursorID int32
Name string
Status CursorOStatus
}
// ReadFrom implements the tds.Package interface.
func (pkg *CurOpenPackage) ReadFrom(ch BytesChannel) error {
totalLength, err := ch.Uint16()
if err != nil {
return ErrNotEnoughBytes
}
pkg.CursorID, err = ch.Int32()
if err != nil {
return ErrNotEnoughBytes
}
n := 4
if pkg.CursorID == 0 {
nameLength, err := ch.Uint8()
if err != nil {
return ErrNotEnoughBytes
}
n++
pkg.Name, err = ch.String(int(nameLength))
if err != nil {
return ErrNotEnoughBytes
}
n += int(nameLength)
}
status, err := ch.Uint8()
if err != nil {
return ErrNotEnoughBytes
}
pkg.Status = CursorOStatus(status)
n++
if n != int(totalLength) {
return fmt.Errorf("expected to read %d bytes, read %d bytes instead", totalLength, n)
}
return nil
}
// WriteTo implements the tds.Package interface.
func (pkg CurOpenPackage) WriteTo(ch BytesChannel) error {
if err := ch.WriteByte(byte(TDS_CUROPEN)); err != nil {
return err
}
// 4 cursorid
// if cursorId == 0:
// 1 name len
// x name
// 1 status
totalLength := 4 + 1
if pkg.CursorID == 0 {
totalLength += 1 + len(pkg.Name)
}
if err := ch.WriteUint16(uint16(totalLength)); err != nil {
return err
}
if err := ch.WriteInt32(pkg.CursorID); err != nil {
return err
}
if pkg.CursorID == 0 {
if err := ch.WriteUint8(uint8(len(pkg.Name))); err != nil {
return err
}
if err := ch.WriteString(pkg.Name); err != nil {
return err
}
}
if err := ch.WriteUint8(uint8(pkg.Status)); err != nil {
return err
}
return nil
}
func (pkg CurOpenPackage) String() string {
return fmt.Sprintf("%T(%d, %s, %s)", pkg, pkg.CursorID, pkg.Name, pkg.Status)
}