Golang C.sb4函数代码示例

// intervalVarSetValue sets the value of the variable.
func intervalVarSetValue(v *Variable, pos uint, value interface{}) error {
	var days, hours, minutes, seconds, microseconds C.sb4

	x, ok := value.(time.Duration)
	if !ok {
		return fmt.Errorf("requires time.Duration, got %T", value)
	}

	days = C.sb4(x.Hours()) / 24
	hours = C.sb4(x.Hours()) - days*24
	minutes = C.sb4(x.Minutes() - x.Hours()*60)
	seconds = C.sb4(x.Seconds()-x.Minutes()) * 60
	microseconds = C.sb4(float64(x.Nanoseconds()/1000) - x.Seconds()*1000*1000)
	if CTrace {
		ctrace("OCIIntervalSetDaySecond(env=%p, err=%p, days=%d, hours=%d, min=%d, sec=%d, micro=%d, handle=%p)",
			v.environment.handle,
			v.environment.errorHandle,
			days, hours, minutes, seconds, microseconds,
			v.getHandle(pos))
	}
	return v.environment.CheckStatus(
		C.OCIIntervalSetDaySecond(unsafe.Pointer(v.environment.handle),
			v.environment.errorHandle,
			days, hours, minutes, seconds, microseconds,
			getIntervalHandle(v, pos)),
		"IntervalSetDaySecond")
}

// Allocate a variable and bind it to the given statement.
func (v *Variable) internalBind() (err error) {
	var status C.sword
	// perform the bind
	aL, rC := v.aLrC()
	allElts := C.ub4(0)
	//actElts := C.ub4(v.actualElements)
	pActElts := &v.actualElements
	if v.isArray {
		allElts = C.ub4(v.allocatedElements)
	} else {
		pActElts = nil
	}
	//log.Printf("%v isArray? %b allElts=%d", v.typ.Name, v.isArray, allElts)
	if v.boundName != "" {
		bname := []byte(v.boundName)
		if CTrace {
			ctrace("internalBind.OCIBindByName", v.boundCursorHandle, &v.bindHandle,
				v.environment.errorHandle, "name="+string(bname), len(bname),
				v.getDataArr(),
				v.bufferSize, v.typ.oracleType, v.indicator, aL, rC,
				allElts, pActElts, "DEFAULT")
		}
		status = C.OCIBindByName(v.boundCursorHandle,
			&v.bindHandle,
			v.environment.errorHandle,
			(*C.OraText)(&bname[0]), C.sb4(len(bname)),
			v.getDataArr(), C.sb4(v.bufferSize),
			v.typ.oracleType, unsafe.Pointer(&v.indicator[0]),
			aL, rC, allElts, pActElts, C.OCI_DEFAULT)
	} else {
		if CTrace {
			ctrace("internalBind.OCIBindByPos", v.boundCursorHandle, &v.bindHandle,
				v.environment.errorHandle, fmt.Sprintf("pos=%d", v.boundPos),
				"dataArr:", fmt.Sprintf("%x", v.dataBytes[:v.bufferSize]),
				"bufsize:", v.bufferSize, "typ:", v.typ.oracleType,
				v.indicator, aL, rC,
				allElts, pActElts, "DEFAULT")
		}
		status = C.OCIBindByPos(v.boundCursorHandle, &v.bindHandle,
			v.environment.errorHandle, C.ub4(v.boundPos), v.getDataArr(),
			C.sb4(v.bufferSize), v.typ.oracleType,
			unsafe.Pointer(&v.indicator[0]), aL, rC,
			allElts, pActElts, C.OCI_DEFAULT)
	}
	if err = v.environment.CheckStatus(status, "BindBy"); err != nil {
		return
	}

	// set the max data size for strings
	if (v.typ == StringVarType || v.typ == FixedCharVarType) &&
		v.size > v.typ.size {
		err = v.environment.AttrSet(
			unsafe.Pointer(v.bindHandle), C.OCI_HTYPE_BIND,
			C.OCI_ATTR_MAXDATA_SIZE, unsafe.Pointer(&v.typ.size),
			C.sizeof_ub4)
	}

	return
}

// beginRow allocates a handle for each column and fetches one row.
func (rset *Rset) beginRow() (err error) {
	rset.log(_drv.cfg.Log.Rset.BeginRow)
	rset.Index++
	// check is open
	if rset.ocistmt == nil {
		return errF("Rset is closed")
	}
	// allocate define descriptor handles
	for _, define := range rset.defs {
		//glog.Infof("Rset.define: ", define)
		rset.logF(_drv.cfg.Log.Rset.BeginRow, "%#v", define)
		err := define.alloc()
		if err != nil {
			return err
		}
	}
	// fetch one row
	r := C.OCIStmtFetch2(
		rset.ocistmt,                 //OCIStmt     *stmthp,
		rset.stmt.ses.srv.env.ocierr, //OCIError    *errhp,
		C.ub4(1),                     //ub4         nrows,
		C.OCI_FETCH_NEXT,             //ub2         orientation,
		C.sb4(0),                     //sb4         fetchOffset,
		C.OCI_DEFAULT)                //ub4         mode );
	if r == C.OCI_ERROR {
		return rset.stmt.ses.srv.env.ociError()
	} else if r == C.OCI_NO_DATA {
		// Adjust Index so that Len() returns correct value when all rows read
		rset.Index--
		// return io.EOF to conform with database/sql/driver
		return io.EOF
	}
	return nil
}

func (s *OCI8Stmt) bind(args []driver.Value) error {
	if args == nil {
		return nil
	}

	var bp *C.OCIBind
	for i, v := range args {
		b := []byte(fmt.Sprintf("%v", v))
		b = append(b, 0)
		rv := C.OCIBindByPos(
			(*C.OCIStmt)(s.s),
			&bp,
			(*C.OCIError)(s.c.err),
			C.ub4(i+1),
			unsafe.Pointer(&b[0]),
			C.sb4(len(b)),
			C.SQLT_STR,
			nil,
			nil,
			nil,
			0,
			nil,
			OCI_MODE)

		if rv == C.OCI_ERROR {
			return ociGetError(s.c.err)
		}
	}
	return nil
}

func (bnd *bndIntervalDS) bind(value IntervalDS, position int, stmt *Stmt) error {
	bnd.stmt = stmt
	r := C.OCIDescriptorAlloc(
		unsafe.Pointer(bnd.stmt.ses.srv.env.ocienv),         //CONST dvoid   *parenth,
		(*unsafe.Pointer)(unsafe.Pointer(&bnd.ociInterval)), //dvoid         **descpp,
		C.OCI_DTYPE_INTERVAL_DS,                             //ub4           type,
		0,   //size_t        xtramem_sz,
		nil) //dvoid         **usrmempp);
	if r == C.OCI_ERROR {
		return bnd.stmt.ses.srv.env.ociError()
	} else if r == C.OCI_INVALID_HANDLE {
		return errNew("unable to allocate oci interval handle during bind")
	}
	r = C.OCIIntervalSetDaySecond(
		unsafe.Pointer(bnd.stmt.ses.srv.env.ocienv), //void               *hndl,
		bnd.stmt.ses.srv.env.ocierr,                 //OCIError           *err,
		C.sb4(value.Day),                            //sb4                dy,
		C.sb4(value.Hour),                           //sb4                hr,
		C.sb4(value.Minute),                         //sb4                mm,
		C.sb4(value.Second),                         //sb4                ss,
		C.sb4(value.Nanosecond),                     //sb4                fsec,
		bnd.ociInterval)                             //OCIInterval        *result );
	if r == C.OCI_ERROR {
		return bnd.stmt.ses.srv.env.ociError()
	}
	r = C.OCIBINDBYPOS(
		bnd.stmt.ocistmt,                              //OCIStmt      *stmtp,
		(**C.OCIBind)(&bnd.ocibnd),                    //OCIBind      **bindpp,
		bnd.stmt.ses.srv.env.ocierr,                   //OCIError     *errhp,
		C.ub4(position),                               //ub4          position,
		unsafe.Pointer(&bnd.ociInterval),              //void         *valuep,
		C.LENGTH_TYPE(unsafe.Sizeof(bnd.ociInterval)), //sb8          value_sz,
		C.SQLT_INTERVAL_DS,                            //ub2          dty,
		nil,                                           //void         *indp,
		nil,                                           //ub2          *alenp,
		nil,                                           //ub2          *rcodep,
		0,                                             //ub4          maxarr_len,
		nil,                                           //ub4          *curelep,
		C.OCI_DEFAULT)                                 //ub4          mode );
	if r == C.OCI_ERROR {
		return bnd.stmt.ses.srv.env.ociError()
	}
	return nil
}

//   Set the value of the variable.
func internalVar_SetValue(v *Variable, pos uint, value interface{}) error {
	var days, hours, minutes, seconds, microseconds C.sb4

	x, ok := value.(time.Duration)
	if !ok {
		return fmt.Errorf("requires time.Duration, got %T", value)
	}

	days = C.sb4(x.Hours()) / 24
	hours = C.sb4(x.Hours()) - days*24
	minutes = C.sb4(x.Minutes() - x.Hours()*60)
	seconds = C.sb4(x.Seconds()-x.Minutes()) * 60
	microseconds = C.sb4(float64(x.Nanoseconds()/1000) - x.Seconds()*1000*1000)
	return v.environment.CheckStatus(
		C.OCIIntervalSetDaySecond(unsafe.Pointer(v.environment.handle),
			v.environment.errorHandle,
			days, hours, minutes, seconds, microseconds,
			(*C.OCIInterval)(unsafe.Pointer(&v.dataBytes[pos*v.typ.size]))),
		"IntervalSetDaySecond")
}

// OpenSrv connects to an Oracle server returning a *Srv and possible error.
func (env *Env) OpenSrv(cfg *SrvCfg) (srv *Srv, err error) {
	env.mu.Lock()
	defer env.mu.Unlock()
	env.log(_drv.cfg.Log.Env.OpenSrv)
	err = env.checkClosed()
	if err != nil {
		return nil, errE(err)
	}
	if cfg == nil {
		return nil, er("Parameter 'cfg' may not be nil.")
	}
	// allocate server handle
	ocisrv, err := env.allocOciHandle(C.OCI_HTYPE_SERVER)
	if err != nil {
		return nil, errE(err)
	}
	// attach to server
	cDblink := C.CString(cfg.Dblink)
	defer C.free(unsafe.Pointer(cDblink))
	r := C.OCIServerAttach(
		(*C.OCIServer)(ocisrv),                //OCIServer     *srvhp,
		env.ocierr,                            //OCIError      *errhp,
		(*C.OraText)(unsafe.Pointer(cDblink)), //const OraText *dblink,
		C.sb4(len(cfg.Dblink)),                //sb4           dblink_len,
		C.OCI_DEFAULT)                         //ub4           mode);
	if r == C.OCI_ERROR {
		return nil, errE(env.ociError())
	}
	// allocate service context handle
	ocisvcctx, err := env.allocOciHandle(C.OCI_HTYPE_SVCCTX)
	if err != nil {
		return nil, errE(err)
	}
	// set server handle onto service context handle
	err = env.setAttr(ocisvcctx, C.OCI_HTYPE_SVCCTX, ocisrv, C.ub4(0), C.OCI_ATTR_SERVER)
	if err != nil {
		return nil, errE(err)
	}

	srv = _drv.srvPool.Get().(*Srv) // set *Srv
	srv.env = env
	srv.ocisrv = (*C.OCIServer)(ocisrv)
	srv.ocisvcctx = (*C.OCISvcCtx)(ocisvcctx)
	if srv.id == 0 {
		srv.id = _drv.srvId.nextId()
	}
	srv.cfg = *cfg
	if srv.cfg.StmtCfg == nil && srv.env.cfg.StmtCfg != nil {
		srv.cfg.StmtCfg = &(*srv.env.cfg.StmtCfg) // copy by value so that user may change independently
	}
	env.openSrvs.add(srv)

	return srv, nil
}

func (stmt *statement) bind(args []driver.Value) error {
	var binding *C.OCIBind
	for pos, value := range args {
		buffer := []byte(fmt.Sprint("%v", value))
		buffer = append(buffer, 0)
		result := C.OCIBindByPos((*C.OCIStmt)(stmt.handle), &binding, (*C.OCIError)(stmt.conn.err), C.ub4(pos+1),
			unsafe.Pointer(&buffer[0]), C.sb4(len(buffer)), C.SQLT_STR, nil, nil, nil, 0, nil, C.OCI_DEFAULT)
		if result != C.OCI_SUCCESS {
			return ociGetError(stmt.conn.err)
		}
	}
	return nil
}

//.........这里部分代码省略.........
		case C.SQLT_CLOB, C.SQLT_BLOB:
			// allocate +io buffers + ub4
			size := int(unsafe.Sizeof(unsafe.Pointer(nil)) + unsafe.Sizeof(C.ub4(0)))
			if oci8cols[i].size < blobBufSize {
				size += blobBufSize
			} else {
				size += oci8cols[i].size
			}
			if ret := C.WrapOCIDescriptorAlloc(s.c.env, C.OCI_DTYPE_LOB, C.size_t(size)); ret.rv != C.OCI_SUCCESS {
				return nil, ociGetError(s.c.err)
			} else {

				oci8cols[i].kind = tp
				oci8cols[i].size = int(unsafe.Sizeof(unsafe.Pointer(nil)))
				oci8cols[i].pbuf = ret.extra
				*(*unsafe.Pointer)(ret.extra) = ret.ptr

			}

			//      testing
			//		case C.SQLT_DAT:
			//
			//			oci8cols[i].kind = C.SQLT_DAT
			//			oci8cols[i].size = int(lp)
			//			oci8cols[i].pbuf = C.malloc(C.size_t(lp))
			//

		case C.SQLT_TIMESTAMP, C.SQLT_DAT:
			if ret := C.WrapOCIDescriptorAlloc(s.c.env, C.OCI_DTYPE_TIMESTAMP, C.size_t(unsafe.Sizeof(unsafe.Pointer(nil)))); ret.rv != C.OCI_SUCCESS {
				return nil, ociGetError(s.c.err)
			} else {

				oci8cols[i].kind = C.SQLT_TIMESTAMP
				oci8cols[i].size = int(unsafe.Sizeof(unsafe.Pointer(nil)))
				oci8cols[i].pbuf = ret.extra
				*(*unsafe.Pointer)(ret.extra) = ret.ptr
			}

		case C.SQLT_TIMESTAMP_TZ, C.SQLT_TIMESTAMP_LTZ:
			if ret := C.WrapOCIDescriptorAlloc(s.c.env, C.OCI_DTYPE_TIMESTAMP_TZ, C.size_t(unsafe.Sizeof(unsafe.Pointer(nil)))); ret.rv != C.OCI_SUCCESS {
				return nil, ociGetError(s.c.err)
			} else {

				oci8cols[i].kind = C.SQLT_TIMESTAMP_TZ
				oci8cols[i].size = int(unsafe.Sizeof(unsafe.Pointer(nil)))
				oci8cols[i].pbuf = ret.extra
				*(*unsafe.Pointer)(ret.extra) = ret.ptr
			}

		case C.SQLT_INTERVAL_DS:
			if ret := C.WrapOCIDescriptorAlloc(s.c.env, C.OCI_DTYPE_INTERVAL_DS, C.size_t(unsafe.Sizeof(unsafe.Pointer(nil)))); ret.rv != C.OCI_SUCCESS {
				return nil, ociGetError(s.c.err)
			} else {

				oci8cols[i].kind = C.SQLT_INTERVAL_DS
				oci8cols[i].size = int(unsafe.Sizeof(unsafe.Pointer(nil)))
				oci8cols[i].pbuf = ret.extra
				*(*unsafe.Pointer)(ret.extra) = ret.ptr
			}

		case C.SQLT_INTERVAL_YM:
			if ret := C.WrapOCIDescriptorAlloc(s.c.env, C.OCI_DTYPE_INTERVAL_YM, C.size_t(unsafe.Sizeof(unsafe.Pointer(nil)))); ret.rv != C.OCI_SUCCESS {
				return nil, ociGetError(s.c.err)
			} else {

				oci8cols[i].kind = C.SQLT_INTERVAL_YM
				oci8cols[i].size = int(unsafe.Sizeof(unsafe.Pointer(nil)))
				oci8cols[i].pbuf = ret.extra
				*(*unsafe.Pointer)(ret.extra) = ret.ptr
			}

		case C.SQLT_RDD: // rowid
			lp = 40
			oci8cols[i].pbuf = C.malloc(C.size_t(lp) + 1)
			oci8cols[i].kind = C.SQLT_CHR // tp
			oci8cols[i].size = int(lp + 1)

		default:
			oci8cols[i].pbuf = C.malloc(C.size_t(lp) + 1)
			oci8cols[i].kind = C.SQLT_CHR // tp
			oci8cols[i].size = int(lp + 1)
		}

		if rv := C.OCIDefineByPos(
			(*C.OCIStmt)(s.s),
			s.defp,
			(*C.OCIError)(s.c.err),
			C.ub4(i+1),
			oci8cols[i].pbuf,
			C.sb4(oci8cols[i].size),
			oci8cols[i].kind,
			unsafe.Pointer(&oci8cols[i].ind),
			&oci8cols[i].rlen,
			nil,
			C.OCI_DEFAULT); rv != C.OCI_SUCCESS {
			return nil, ociGetError(s.c.err)
		}
	}
	return &OCI8Rows{s, oci8cols, false}, nil
}

func (s *OCI8Stmt) bind(args []driver.Value) (boundParameters []oci8bind, err error) {
	if args == nil {
		return nil, nil
	}

	var (
		dty   C.ub2
		cdata *C.char
		clen  C.sb4
	)
	*s.bp = nil
	for i, v := range args {

		switch v.(type) {
		case nil:
			dty = C.SQLT_STR
			cdata = nil
			clen = 0
		case []byte:
			v := v.([]byte)
			dty = C.SQLT_BIN
			cdata = CByte(v)
			clen = C.sb4(len(v))
			boundParameters = append(boundParameters, oci8bind{dty, unsafe.Pointer(cdata)})

		case float64:
			fb := math.Float64bits(v.(float64))
			if fb&0x8000000000000000 != 0 {
				fb ^= 0xffffffffffffffff
			} else {
				fb |= 0x8000000000000000
			}
			dty = C.SQLT_IBDOUBLE
			cdata = CByte([]byte{byte(fb >> 56), byte(fb >> 48), byte(fb >> 40), byte(fb >> 32), byte(fb >> 24), byte(fb >> 16), byte(fb >> 8), byte(fb)})
			clen = 8
			boundParameters = append(boundParameters, oci8bind{dty, unsafe.Pointer(cdata)})

		case time.Time:

			var pt unsafe.Pointer
			var zp unsafe.Pointer

			now := v.(time.Time)
			_, offset := now.Zone()

			sign := '+'
			if offset < 0 {
				offset = -offset
				sign = '-'
			}
			offset /= 60

			// oracle accepts zones "[+-]hh:mm"
			zone := fmt.Sprintf("%c%02d:%02d", sign, offset/60, offset%60)
			zoneTxt := now.Location().String()

			size := len(zoneTxt)
			if size < 8 {
				size = 8
			}
			size += int(unsafe.Sizeof(unsafe.Pointer(nil)))
			if ret := C.WrapOCIDescriptorAlloc(
				s.c.env,
				C.OCI_DTYPE_TIMESTAMP_TZ,
				C.size_t(size)); ret.rv != C.OCI_SUCCESS {
				defer freeBoundParameters(boundParameters)
				return nil, ociGetError(s.c.err)
			} else {
				dty = C.SQLT_TIMESTAMP_TZ
				clen = C.sb4(unsafe.Sizeof(pt))
				pt = ret.extra
				*(*unsafe.Pointer)(ret.extra) = ret.ptr
				zp = unsafe.Pointer(uintptr(ret.extra) + unsafe.Sizeof(unsafe.Pointer(nil)))
				boundParameters = append(boundParameters, oci8bind{dty, pt})

			}
			for first := true; ; first = false {
				copy((*[1 << 30]byte)(zp)[0:len(zone)], zone)
				rv := C.OCIDateTimeConstruct(
					s.c.env,
					(*C.OCIError)(s.c.err),
					(*C.OCIDateTime)(*(*unsafe.Pointer)(pt)),
					C.sb2(now.Year()),
					C.ub1(now.Month()),
					C.ub1(now.Day()),
					C.ub1(now.Hour()),
					C.ub1(now.Minute()),
					C.ub1(now.Second()),
					C.ub4(now.Nanosecond()),
					(*C.OraText)(zp),
					C.size_t(len(zone)),
				)
				if rv != C.OCI_SUCCESS {
					if !first {
						defer freeBoundParameters(boundParameters)
						return nil, ociGetError(s.c.err)
					}
					zone = zoneTxt
				} else {
					break
//.........这里部分代码省略.........

// Connect to the database.
// good minimal example: http://www.adp-gmbh.ch/ora/misc/oci/index.html
func (conn *Connection) Connect(mode int64, twophase bool /*, newPassword string*/) error {
	credentialType := C.OCI_CRED_EXT
	var (
		status C.sword
		err    error
	)
	defer func() {
		if err != nil {
			conn.Free(false)
		}
	}()

	// free handles
	conn.Free(false)
	// allocate the server handle
	if ociHandleAlloc(unsafe.Pointer(conn.environment.handle),
		C.OCI_HTYPE_SERVER,
		(*unsafe.Pointer)(unsafe.Pointer(&conn.serverHandle)),
		"Connect[allocate server handle]"); err != nil {
		return err
	}

	// attach to the server
	/*
	   if (cxBuffer_FromObject(&buffer, self->dsn,
	           self->environment->encoding) < 0)
	       return -1;
	*/

	buffer := make([]byte, max(16, len(conn.dsn), len(conn.username), len(conn.password))+1)
	copy(buffer, []byte(conn.dsn))
	buffer[len(conn.dsn)] = 0
	// dsn := C.CString(conn.dsn)
	// defer C.free(unsafe.Pointer(dsn))
	// Py_BEGIN_ALLOW_THREADS
	conn.srvMtx.Lock()
	// log.Printf("buffer=%s", buffer)
	status = C.OCIServerAttach(conn.serverHandle,
		conn.environment.errorHandle, (*C.OraText)(&buffer[0]),
		C.sb4(len(buffer)), C.OCI_DEFAULT)
	// Py_END_ALLOW_THREADS
	conn.srvMtx.Unlock()
	// cxBuffer_Clear(&buffer);
	if err = conn.environment.CheckStatus(status, "Connect[server attach]"); err != nil {
		return err
	}
	// log.Printf("attached to server %s", conn.serverHandle)

	// allocate the service context handle
	if err = ociHandleAlloc(unsafe.Pointer(conn.environment.handle),
		C.OCI_HTYPE_SVCCTX, (*unsafe.Pointer)(unsafe.Pointer(&conn.handle)),
		"Connect[allocate service context handle]"); err != nil {
		return err
	}
	// log.Printf("allocated service context handle")

	// set attribute for server handle
	if err = conn.AttrSet(C.OCI_ATTR_SERVER, unsafe.Pointer(conn.serverHandle), 0); err != nil {
		setErrAt(err, "Connect[set server handle]")
		return err
	}

	// set the internal and external names; these are needed for global
	// transactions but are limited in terms of the lengths of the strings
	if twophase {
		name := []byte("goracle")
		copy(buffer, name)
		buffer[len(name)] = 0

		if err = conn.ServerAttrSet(C.OCI_ATTR_INTERNAL_NAME,
			unsafe.Pointer(&buffer[0]), len(name)); err != nil {
			setErrAt(err, "Connect[set internal name]")
			return err
		}
		if err = conn.ServerAttrSet(C.OCI_ATTR_EXTERNAL_NAME,
			unsafe.Pointer(&buffer[0]), len(name)); err != nil {
			setErrAt(err, "Connect[set external name]")
			return err
		}
	}

	// allocate the session handle
	if err = ociHandleAlloc(unsafe.Pointer(conn.environment.handle),
		C.OCI_HTYPE_SESSION,
		(*unsafe.Pointer)(unsafe.Pointer(&conn.sessionHandle)),
		"Connect[allocate session handle]"); err != nil {
		return err
	}
	// log.Printf("allocated session handle")

	// set user name in session handle
	if conn.username != "" {
		copy(buffer, []byte(conn.username))
		buffer[len(conn.username)] = 0
		credentialType = C.OCI_CRED_RDBMS

		if err = conn.SessionAttrSet(C.OCI_ATTR_USERNAME,
			unsafe.Pointer(&buffer[0]), len(conn.username)); err != nil {
//.........这里部分代码省略.........

// Allocate a variable and bind it to the given statement.
func (v *Variable) internalBind() (err error) {
	if CTrace {
		ctrace("%s.internalBind", v)
	}

	var status C.sword
	// perform the bind
	indic, aL, rC := v.aLrC()
	allElts := C.ub4(0)
	pActElts := &v.actualElements
	if v.isArray {
		allElts = C.ub4(v.allocatedElements)
	} else {
		pActElts = nil
	}
	//log.Printf("%v isArray? %b allElts=%d", v.typ.Name, v.isArray, allElts)
	var bindName string
	var bufSlice interface{}
	var m int
	if CTrace {
		m = int(v.bufferSize)
		if m > 40 {
			m = 40
		}
		switch {
		case v.dataInts != nil:
			if m > len(v.dataInts) {
				m = len(v.dataInts)
			}
			bufSlice = v.dataInts[:m]
		case v.dataFloats != nil:
			if m > len(v.dataFloats) {
				m = len(v.dataFloats)
			}
			bufSlice = v.dataFloats[:m]
		default:
			if m > len(v.dataBytes) {
				m = len(v.dataBytes)
			}
			bufSlice = v.dataBytes[:m]
		}
	}
	if v.boundName != "" {
		bname := []byte(v.boundName)
		if CTrace {
			ctrace("internalBind.OCIBindByName(cur=%p, bind=%p, env=%p, name=%q, bufferSize=%d, oracleType=%d, data[:%d]=%v, indicator=%v, aL=%v, rC=%v, allElts=%v, pActElts=%v, DEFAULT)",
				v.boundCursorHandle, &v.bindHandle,
				v.environment.errorHandle, bname,
				v.bufferSize, v.typ.oracleType, m, bufSlice,
				v.indicator, aL, rC,
				allElts, pActElts)
		}
		bindName = fmt.Sprintf("%q", bname)
		status = C.OCIBindByName(v.boundCursorHandle,
			&v.bindHandle,
			v.environment.errorHandle,
			(*C.OraText)(&bname[0]), C.sb4(len(bname)),
			v.getDataArr(), C.sb4(v.bufferSize), v.typ.oracleType,
			indic, aL, rC,
			allElts, pActElts, C.OCI_DEFAULT)
	} else {
		if CTrace {
			m := int(v.bufferSize)
			if m > 40 {
				m = 40
			}
			switch {
			case v.dataInts != nil:
				if m > len(v.dataInts) {
					m = len(v.dataInts)
				}
				bufSlice = v.dataInts[:m]
			case v.dataFloats != nil:
				if m > len(v.dataFloats) {
					m = len(v.dataFloats)
				}
				bufSlice = v.dataFloats[:m]
			default:
				if m > len(v.dataBytes) {
					m = len(v.dataBytes)
				}
				bufSlice = v.dataBytes[:m]
			}
			ctrace("internalBind.OCIBindByPos(cur=%p, boundPos=%d, data[:%d]=%v, bufSize=%d, oracleType=%d, indicator=%v, actLen=%v, rc=%p, allElts=%p pActElts=%p)",
				v.boundCursorHandle, v.boundPos, m, bufSlice,
				v.bufferSize, v.typ.oracleType, v.indicator, aL, rC,
				allElts, pActElts)
		}
		bindName = fmt.Sprintf("%d", v.boundPos)
		status = C.OCIBindByPos(v.boundCursorHandle, &v.bindHandle,
			v.environment.errorHandle, C.ub4(v.boundPos), v.getDataArr(),
			C.sb4(v.bufferSize), v.typ.oracleType,
			indic, aL, rC,
			allElts, pActElts, C.OCI_DEFAULT)
	}
	if err = v.environment.CheckStatus(status, fmt.Sprintf("BindBy(%s)", bindName)); err != nil {
		err = errgo.Mask(err)
		return
	}
//.........这里部分代码省略.........

// Helper routine for Variable_Define() used so that constant calls to
// OCIDescriptorFree() is not necessary.
func (cur *Cursor) variableDefineHelper(param *C.OCIParam, position, numElements uint) (v *Variable, err error) {
	var size C.ub4
	var varType *VariableType

	// determine data type
	varType, err = varTypeByOracleDescriptor(param, cur.environment)
	if err != nil {
		log.Printf("error determining data type: %s", err)
		return nil, err
	}
	// if (cursor->numbersAsStrings && varType == &vt_Float)
	//     varType = &vt_NumberAsString;

	// retrieve size of the parameter
	size = C.ub4(varType.size)
	if varType.isVariableLength {
		var sizeFromOracle C.ub2
		// determine the maximum length from Oracle
		if _, err = cur.environment.AttrGet(
			unsafe.Pointer(param), C.OCI_HTYPE_DESCRIBE,
			C.OCI_ATTR_DATA_SIZE, unsafe.Pointer(&sizeFromOracle),
			"data size"); err != nil {
			log.Printf("error getting data size: %+v", err)
			return nil, err
		}
		if CTrace {
			log.Printf("size of %p[%s] @ %d: %d", param, varType, position, sizeFromOracle)
		}

		// use the length from Oracle directly if available
		if uint(sizeFromOracle) > 0 {
			size = C.ub4(sizeFromOracle)
		} else if cur.outputSize >= 0 {
			// otherwise, use the value set with the setoutputsize() parameter
			if cur.outputSizeColumn < 0 ||
				int(position) == cur.outputSizeColumn {
				size = C.ub4(cur.outputSize)
			}
		}
	}

	// create a variable of the correct type
	/*
	   if cur.outputTypeHandler && cursor->outputTypeHandler != Py_None)
	       var = Variable_NewByOutputTypeHandler(cursor, param,
	               cursor->outputTypeHandler, varType, size, numElements);
	   else if (cursor->connection->outputTypeHandler &&
	           cursor->connection->outputTypeHandler != Py_None)
	       var = Variable_NewByOutputTypeHandler(cursor, param,
	               cursor->connection->outputTypeHandler, varType, size,
	               numElements);
	   else
	*/
	//log.Printf("varType=%#v size=%d", varType, size)
	v, err = cur.NewVariable(numElements, varType, uint(size))
	if err != nil {
		return nil, errgo.Newf("error creating variable: %s", err)
	}

	// call the procedure to set values prior to define
	if v.typ.preDefine != nil {
		if err = v.typ.preDefine(v, param); err != nil {
			return nil, errgo.Newf("error with preDefine(%s): %s", v, err)
		}
	}

	// perform the define
	//log.Printf("v=%#v", v)
	indic, aL, rC := v.aLrC()
	if CTrace {
		ctrace("OCIDefineByPos(cur=%p, defineHandle=%p, env=%p, position=%d, dataArr=%v, bufferSize=%d, oracleType=%d indicator=%v, aL=%v rC=%v, DEFAULT)",
			cur.handle, &v.defineHandle, v.environment.errorHandle,
			position, v.getDataArr(), v.bufferSize, v.typ.oracleType, v.indicator,
			aL, rC)
	}
	if err = cur.environment.CheckStatus(
		C.OCIDefineByPos(cur.handle,
			&v.defineHandle,
			v.environment.errorHandle, C.ub4(position), v.getDataArr(),
			C.sb4(v.bufferSize), v.typ.oracleType,
			indic, aL, rC, C.OCI_DEFAULT),
		"define"); err != nil {
		return nil, errgo.Newf("error defining: %s", err)
	}

	// call the procedure to set values after define
	if v.typ.postDefine != nil {
		if err = v.typ.postDefine(v); err != nil {
			return nil, errgo.Newf("error with postDefine(%s): %s", v, err)
		}
	}

	return v, nil
}

func (s *OCI8Stmt) Query(args []driver.Value) (driver.Rows, error) {
	if err := s.bind(args); err != nil {
		return nil, err
	}

	var t C.int
	C.OCIAttrGet(
		s.s,
		C.OCI_HTYPE_STMT,
		unsafe.Pointer(&t),
		nil,
		C.OCI_ATTR_STMT_TYPE,
		(*C.OCIError)(s.c.err))
	iter := C.ub4(1)
	if t == C.OCI_STMT_SELECT {
		iter = 0
	}

	rv := C.OCIStmtExecute(
		(*C.OCIServer)(s.c.svc),
		(*C.OCIStmt)(s.s),
		(*C.OCIError)(s.c.err),
		iter,
		0,
		nil,
		nil,
		OCI_MODE)
	if rv == C.OCI_ERROR {
		return nil, ociGetError(s.c.err)
	}

	var rc C.ub2
	C.OCIAttrGet(
		s.s,
		C.OCI_HTYPE_STMT,
		unsafe.Pointer(&rc),
		nil,
		C.OCI_ATTR_PARAM_COUNT,
		(*C.OCIError)(s.c.err))

	oci8cols := make([]oci8col, int(rc))
	for i := 0; i < int(rc); i++ {
		var p unsafe.Pointer
		var np *C.char
		var ns C.ub4
		var tp C.ub2
		var lp C.ub2
		C.OCIParamGet(
			s.s,
			C.OCI_HTYPE_STMT,
			(*C.OCIError)(s.c.err),
			(*unsafe.Pointer)(unsafe.Pointer(&p)),
			C.ub4(i+1))
		C.OCIAttrGet(
			p,
			C.OCI_DTYPE_PARAM,
			unsafe.Pointer(&tp),
			nil,
			C.OCI_ATTR_DATA_TYPE,
			(*C.OCIError)(s.c.err))
		C.OCIAttrGet(
			p,
			C.OCI_DTYPE_PARAM,
			unsafe.Pointer(&np),
			&ns,
			C.OCI_ATTR_NAME,
			(*C.OCIError)(s.c.err))
		C.OCIAttrGet(
			p,
			C.OCI_DTYPE_PARAM,
			unsafe.Pointer(&lp),
			nil,
			C.OCI_ATTR_DATA_SIZE,
			(*C.OCIError)(s.c.err))
		oci8cols[i].name = string((*[1 << 30]byte)(unsafe.Pointer(np))[0:int(ns)])
		oci8cols[i].kind = int(tp)
		oci8cols[i].size = int(lp)
		oci8cols[i].pbuf = make([]byte, int(lp)+1)

		var defp *C.OCIDefine
		rv = C.OCIDefineByPos(
			(*C.OCIStmt)(s.s),
			&defp,
			(*C.OCIError)(s.c.err),
			C.ub4(i+1),
			unsafe.Pointer(&oci8cols[i].pbuf[0]),
			C.sb4(lp+1),
			C.SQLT_CHR,
			nil,
			nil,
			nil,
			OCI_MODE)
		if rv == C.OCI_ERROR {
			return nil, ociGetError(s.c.err)
		}
	}
	return &OCI8Rows{s, oci8cols, false}, nil
}

func (s *OCI8Stmt) bind(args []driver.Value) (freeBoundParameters func(), err error) {
	if args == nil {
		return func() {}, nil
	}

	var (
		bp              *C.OCIBind
		dty             int
		data            []byte
		cdata           *C.char
		boundParameters []*C.char
	)

	freeBoundParameters = func() {
		for _, p := range boundParameters {
			C.free(unsafe.Pointer(p))
		}
	}

	for i, v := range args {
		data = []byte{}

		switch v.(type) {
		case nil:
			dty = C.SQLT_STR
			data = []byte{0}
		case time.Time:
			dty = C.SQLT_DAT
			now := v.(time.Time).In(s.c.location)
			//TODO Handle BCE dates (http://docs.oracle.com/cd/B12037_01/appdev.101/b10779/oci03typ.htm#438305)
			//TODO Handle timezones (http://docs.oracle.com/cd/B12037_01/appdev.101/b10779/oci03typ.htm#443601)
			data = []byte{
				byte(now.Year()/100 + 100),
				byte(now.Year()%100 + 100),
				byte(now.Month()),
				byte(now.Day()),
				byte(now.Hour() + 1),
				byte(now.Minute() + 1),
				byte(now.Second() + 1),
			}
		default:
			dty = C.SQLT_STR
			data = []byte(fmt.Sprintf("%v", v))
			data = append(data, 0)
		}

		cdata = C.CString(string(data))
		boundParameters = append(boundParameters, cdata)
		rv := C.OCIBindByPos(
			(*C.OCIStmt)(s.s),
			&bp,
			(*C.OCIError)(s.c.err),
			C.ub4(i+1),
			unsafe.Pointer(cdata),
			C.sb4(len(data)),
			C.ub2(dty),
			nil,
			nil,
			nil,
			0,
			nil,
			C.OCI_DEFAULT)

		if rv == C.OCI_ERROR {
			defer freeBoundParameters()
			return nil, ociGetError(s.c.err)
		}
	}
	return freeBoundParameters, nil
}