func describeColumn(h api.SQLHSTMT, idx int, namebuf []uint16) (namelen int, sqltype api.SQLSMALLINT, size api.SQLULEN, ret api.SQLRETURN) {
var l, decimal, nullable api.SQLSMALLINT
ret = api.SQLDescribeCol(h, api.SQLUSMALLINT(idx+1),
(*api.SQLWCHAR)(unsafe.Pointer(&namebuf[0])),
api.SQLSMALLINT(len(namebuf)), &l,
&sqltype, &size, &decimal, &nullable)
return int(l), sqltype, size, ret
}
func NewError(apiName string, handle interface{}) (err error) {
// catch any panics -- possible with calls the api with invalid handles
defer func() {
if r := recover(); r != nil {
err = fmt.Errorf("%#v", r)
}
}()
h, ht := ToHandleAndType(handle)
e := &Error{APIName: apiName}
var ne api.SQLINTEGER
state := make([]uint16, 6)
msg := make([]uint16, api.SQL_MAX_MESSAGE_LENGTH)
for i := 1; ; i++ {
ret := api.SQLGetDiagRec(ht, h, api.SQLSMALLINT(i),
(*api.SQLWCHAR)(unsafe.Pointer(&state[0])), &ne,
(*api.SQLWCHAR)(unsafe.Pointer(&msg[0])),
api.SQLSMALLINT(len(msg)), nil)
if ret == api.SQL_NO_DATA {
break
}
if IsError(ret) {
return fmt.Errorf("SQLGetDiagRec failed: ret=%d", ret)
}
r := DiagRecord{
State: api.UTF16ToString(state),
NativeError: int(ne),
Message: api.UTF16ToString(msg),
}
if r.State == "08S01" {
return driver.ErrBadConn
}
e.Diag = append(e.Diag, r)
}
return e
}
func (p *Parameter) BindValue(h api.SQLHSTMT, idx int, v driver.Value) error {
// TODO(brainman): Reuse memory for previously bound values. If memory
// is reused, we, probably, do not need to call SQLBindParameter either.
var ctype, sqltype, decimal api.SQLSMALLINT
var size api.SQLULEN
var buflen api.SQLLEN
var plen *api.SQLLEN
var buf unsafe.Pointer
switch d := v.(type) {
case nil:
ctype = api.SQL_C_WCHAR
p.Data = nil
buf = nil
size = 1
buflen = 0
plen = p.StoreStrLen_or_IndPtr(api.SQL_NULL_DATA)
sqltype = api.SQL_WCHAR
case string:
ctype = api.SQL_C_WCHAR
b := api.StringToUTF16(d)
p.Data = b
buf = unsafe.Pointer(&b[0])
l := len(b)
l -= 1 // remove terminating 0
size = api.SQLULEN(l)
if size < 1 {
// size cannot be less then 1 even for empty fields
size = 1
}
l *= 2 // every char takes 2 bytes
buflen = api.SQLLEN(l)
plen = p.StoreStrLen_or_IndPtr(buflen)
switch {
case size >= 4000:
sqltype = api.SQL_WLONGVARCHAR
case p.isDescribed:
sqltype = p.SQLType
case size <= 1:
sqltype = api.SQL_WVARCHAR
default:
sqltype = api.SQL_WCHAR
}
case int64:
ctype = api.SQL_C_SBIGINT
p.Data = &d
buf = unsafe.Pointer(&d)
sqltype = api.SQL_BIGINT
size = 8
case bool:
var b byte
if d {
b = 1
}
ctype = api.SQL_C_BIT
p.Data = &b
buf = unsafe.Pointer(&b)
sqltype = api.SQL_BIT
size = 1
case float64:
ctype = api.SQL_C_DOUBLE
p.Data = &d
buf = unsafe.Pointer(&d)
sqltype = api.SQL_DOUBLE
size = 8
case time.Time:
ctype = api.SQL_C_TYPE_TIMESTAMP
y, m, day := d.Date()
b := api.SQL_TIMESTAMP_STRUCT{
Year: api.SQLSMALLINT(y),
Month: api.SQLUSMALLINT(m),
Day: api.SQLUSMALLINT(day),
Hour: api.SQLUSMALLINT(d.Hour()),
Minute: api.SQLUSMALLINT(d.Minute()),
Second: api.SQLUSMALLINT(d.Second()),
Fraction: api.SQLUINTEGER(d.Nanosecond()),
}
p.Data = &b
buf = unsafe.Pointer(&b)
sqltype = api.SQL_TYPE_TIMESTAMP
if p.isDescribed && p.SQLType == api.SQL_TYPE_TIMESTAMP {
decimal = p.Decimal
}
if decimal <= 0 {
// represented as yyyy-mm-dd hh:mm:ss.fff format in ms sql server
decimal = 3
}
size = 20 + api.SQLULEN(decimal)
case []byte:
ctype = api.SQL_C_BINARY
b := make([]byte, len(d))
copy(b, d)
p.Data = b
buf = unsafe.Pointer(&b[0])
buflen = api.SQLLEN(len(b))
plen = p.StoreStrLen_or_IndPtr(buflen)
size = api.SQLULEN(len(b))
switch {
case p.isDescribed:
sqltype = p.SQLType
case size <= 0:
sqltype = api.SQL_LONGVARBINARY
case size >= 8000:
sqltype = api.SQL_LONGVARBINARY
default:
sqltype = api.SQL_BINARY
}
default:
panic(fmt.Errorf("unsupported type %T", v))
}
ret := api.SQLBindParameter(h, api.SQLUSMALLINT(idx+1),
api.SQL_PARAM_INPUT, ctype, sqltype, size, decimal,
api.SQLPOINTER(buf), buflen, plen)
if IsError(ret) {
return NewError("SQLBindParameter", h)
}
return nil
}