forked from mattn/go-adodb
/
adodb.go
396 lines (373 loc) · 8.86 KB
/
adodb.go
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package adodb
import (
"database/sql"
"database/sql/driver"
"github.com/mattn/go-ole"
"github.com/mattn/go-ole/oleutil"
"io"
"math"
"math/big"
"time"
"unsafe"
)
func init() {
sql.Register("adodb", &AdodbDriver{})
}
type AdodbDriver struct {
}
type AdodbConn struct {
db *ole.IDispatch
}
type AdodbTx struct {
c *AdodbConn
}
func (tx *AdodbTx) Commit() error {
_, err := oleutil.CallMethod(tx.c.db, "CommitTrans")
if err != nil {
return err
}
return nil
}
func (tx *AdodbTx) Rollback() error {
_, err := oleutil.CallMethod(tx.c.db, "Rollback")
if err != nil {
return err
}
return nil
}
func (c *AdodbConn) exec(cmd string) error {
_, err := oleutil.CallMethod(c.db, "Execute", cmd)
return err
}
func (c *AdodbConn) Begin() (driver.Tx, error) {
_, err := oleutil.CallMethod(c.db, "BeginTrans")
if err != nil {
return nil, err
}
return &AdodbTx{c}, nil
}
func (d *AdodbDriver) Open(dsn string) (driver.Conn, error) {
ole.CoInitialize(0)
unknown, err := oleutil.CreateObject("ADODB.Connection")
if err != nil {
return nil, err
}
db, err := unknown.QueryInterface(ole.IID_IDispatch)
if err != nil {
return nil, err
}
_, err = oleutil.CallMethod(db, "Open", dsn)
if err != nil {
return nil, err
}
return &AdodbConn{db}, nil
}
func (c *AdodbConn) Close() error {
_, err := oleutil.CallMethod(c.db, "Close")
if err != nil {
return err
}
c.db = nil
ole.CoUninitialize()
return nil
}
type AdodbStmt struct {
c *AdodbConn
s *ole.IDispatch
ps *ole.IDispatch
b []string
}
func (c *AdodbConn) Prepare(query string) (driver.Stmt, error) {
unknown, err := oleutil.CreateObject("ADODB.Command")
if err != nil {
return nil, err
}
s, err := unknown.QueryInterface(ole.IID_IDispatch)
if err != nil {
return nil, err
}
_, err = oleutil.PutProperty(s, "ActiveConnection", c.db)
if err != nil {
return nil, err
}
_, err = oleutil.PutProperty(s, "CommandText", query)
if err != nil {
return nil, err
}
_, err = oleutil.PutProperty(s, "CommandType", 1)
if err != nil {
return nil, err
}
_, err = oleutil.PutProperty(s, "Prepared", true)
if err != nil {
return nil, err
}
val, err := oleutil.GetProperty(s, "Parameters")
if err != nil {
return nil, err
}
return &AdodbStmt{c, s, val.ToIDispatch(), nil}, nil
}
func (s *AdodbStmt) Bind(bind []string) error {
s.b = bind
return nil
}
func (s *AdodbStmt) Close() error {
s.s.Release()
return nil
}
func (s *AdodbStmt) NumInput() int {
if s.b != nil {
return len(s.b)
}
_, err := oleutil.CallMethod(s.ps, "Refresh")
if err != nil {
return -1
}
val, err := oleutil.GetProperty(s.ps, "Count")
if err != nil {
return -1
}
c := int(val.Val)
return c
}
func (s *AdodbStmt) bind(args []driver.Value) error {
if s.b != nil {
for i, v := range args {
var b string = "?"
if len(s.b) < i {
b = s.b[i]
}
unknown, err := oleutil.CallMethod(s.s, "CreateParameter", b, 12, 1)
if err != nil {
return err
}
param := unknown.ToIDispatch()
defer param.Release()
_, err = oleutil.PutProperty(param, "Value", v)
if err != nil {
return err
}
_, err = oleutil.CallMethod(s.ps, "Append", param)
if err != nil {
return err
}
}
} else {
for i, v := range args {
var varval ole.VARIANT
varval.VT = ole.VT_I4
varval.Val = int64(i)
val, err := oleutil.CallMethod(s.ps, "Item", &varval)
if err != nil {
return err
}
item := val.ToIDispatch()
defer item.Release()
_, err = oleutil.PutProperty(item, "Value", v)
if err != nil {
return err
}
}
}
return nil
}
func (s *AdodbStmt) Query(args []driver.Value) (driver.Rows, error) {
if err := s.bind(args); err != nil {
return nil, err
}
rc, err := oleutil.CallMethod(s.s, "Execute")
if err != nil {
return nil, err
}
return &AdodbRows{s, rc.ToIDispatch(), -1, nil}, nil
}
func (s *AdodbStmt) Exec(args []driver.Value) (driver.Result, error) {
if err := s.bind(args); err != nil {
return nil, err
}
_, err := oleutil.CallMethod(s.s, "Execute")
if err != nil {
return nil, err
}
return driver.ResultNoRows, nil
}
type AdodbRows struct {
s *AdodbStmt
rc *ole.IDispatch
nc int
cols []string
}
func (rc *AdodbRows) Close() error {
_, err := oleutil.CallMethod(rc.rc, "Close")
if err != nil {
return err
}
return nil
}
func (rc *AdodbRows) Columns() []string {
if rc.nc != len(rc.cols) {
unknown, err := oleutil.GetProperty(rc.rc, "Fields")
if err != nil {
return []string{}
}
fields := unknown.ToIDispatch()
defer fields.Release()
val, err := oleutil.GetProperty(fields, "Count")
if err != nil {
return []string{}
}
rc.nc = int(val.Val)
rc.cols = make([]string, rc.nc)
for i := 0; i < rc.nc; i++ {
var varval ole.VARIANT
varval.VT = ole.VT_I4
varval.Val = int64(i)
val, err := oleutil.CallMethod(fields, "Item", &varval)
if err != nil {
return []string{}
}
item := val.ToIDispatch()
if err != nil {
return []string{}
}
name, err := oleutil.GetProperty(item, "Name")
if err != nil {
return []string{}
}
rc.cols[i] = name.ToString()
item.Release()
}
}
return rc.cols
}
func (rc *AdodbRows) Next(dest []driver.Value) error {
unknown, err := oleutil.GetProperty(rc.rc, "EOF")
if err != nil {
return io.EOF
}
if unknown.Val != 0 {
return io.EOF
}
unknown, err = oleutil.GetProperty(rc.rc, "Fields")
if err != nil {
return err
}
fields := unknown.ToIDispatch()
defer fields.Release()
for i := range dest {
var varval ole.VARIANT
varval.VT = ole.VT_I4
varval.Val = int64(i)
val, err := oleutil.CallMethod(fields, "Item", &varval)
if err != nil {
return err
}
field := val.ToIDispatch()
defer field.Release()
typ, err := oleutil.GetProperty(field, "Type")
if err != nil {
return err
}
val, err = oleutil.GetProperty(field, "Value")
if err != nil {
return err
}
sc, err := oleutil.GetProperty(field, "NumericScale")
field.Release()
if val.VT == 1 /* VT_NULL */ {
dest[i] = nil
continue
}
switch typ.Val {
case 0: // ADEMPTY
dest[i] = nil
case 2: // ADSMALLINT
dest[i] = int64(int16(val.Val))
case 3: // ADINTEGER
dest[i] = int64(int32(val.Val))
case 4: // ADSINGLE
dest[i] = float64(math.Float32frombits(uint32(val.Val)))
case 5: // ADDOUBLE
dest[i] = math.Float64frombits(uint64(val.Val))
case 6: // ADCURRENCY
dest[i] = float64(val.Val) / 10000
case 7: // ADDATE
// see http://blogs.msdn.com/b/ericlippert/archive/2003/09/16/eric-s-complete-guide-to-vt-date.aspx
d, t := math.Modf(math.Float64frombits(uint64(val.Val)))
t = math.Abs(t)
dest[i] = time.Date(1899, 12, 30+int(d), 0, 0, int(t*86400), 0, time.Local)
case 8: // ADBSTR
dest[i] = val.ToString()
case 9: // ADIDISPATCH
dest[i] = val.ToIDispatch()
case 10: // ADERROR
// TODO
case 11: // ADBOOLEAN
dest[i] = val.Val != 0
case 12: // ADVARIANT
dest[i] = val
case 13: // ADIUNKNOWN
dest[i] = val.ToIUnknown()
case 14: // ADDECIMAL
dest[i] = float64(val.Val)
case 16: // ADTINYINT
dest[i] = int8(val.Val)
case 17: // ADUNSIGNEDTINYINT
dest[i] = uint8(val.Val)
case 18: // ADUNSIGNEDSMALLINT
dest[i] = uint16(val.Val)
case 19: // ADUNSIGNEDINT
dest[i] = uint32(val.Val)
case 20: // ADBIGINT
dest[i] = big.NewInt(val.Val)
case 21: // ADUNSIGNEDBIGINT
// TODO
case 72: // ADGUID
dest[i] = val.ToString()
case 128: // ADBINARY
sa := (*ole.SAFEARRAY)(unsafe.Pointer(uintptr(val.Val)))
dest[i] = (*[1 << 30]byte)(unsafe.Pointer(uintptr(sa.Data)))[0:sa.Bounds.Elements]
case 129: // ADCHAR
dest[i] = val.ToString() //uint8(val.Val)
case 130: // ADWCHAR
dest[i] = val.ToString() //uint16(val.Val)
case 131: // ADNUMERIC
sub := math.Pow(10, float64(sc.Val))
dest[i] = float64(float64(val.Val) / sub)
case 132: // ADUSERDEFINED
dest[i] = uintptr(val.Val)
case 133: // ADDBDATE
// see http://blogs.msdn.com/b/ericlippert/archive/2003/09/16/eric-s-complete-guide-to-vt-date.aspx
d := math.Float64frombits(uint64(val.Val))
dest[i] = time.Date(1899, 12, 30+int(d), 0, 0, 0, 0, time.Local)
case 134: // ADDBTIME
t := math.Float64frombits(uint64(val.Val))
dest[i] = time.Date(0, 1, 1, 0, 0, int(t*86400), 0, time.Local)
case 135: // ADDBTIMESTAMP
d, t := math.Modf(math.Float64frombits(uint64(val.Val)))
t = math.Abs(t)
dest[i] = time.Date(1899, 12, 30+int(d), 0, 0, int(t*86400), 0, time.Local)
case 136: // ADCHAPTER
dest[i] = val.ToString()
case 200: // ADVARCHAR
dest[i] = val.ToString()
case 201: // ADLONGVARCHAR
dest[i] = val.ToString()
case 202: // ADVARWCHAR
dest[i] = val.ToString()
case 203: // ADLONGVARWCHAR
dest[i] = val.ToString()
case 204: // ADVARBINARY
// TODO
case 205: // ADLONGVARBINARY
sa := (*ole.SAFEARRAY)(unsafe.Pointer(uintptr(val.Val)))
dest[i] = (*[1 << 30]byte)(unsafe.Pointer(uintptr(sa.Data)))[0:sa.Bounds.Elements]
}
}
_, err = oleutil.CallMethod(rc.rc, "MoveNext")
if err != nil {
return err
}
return nil
}