func (c *Conn) PrepareODBCStmt(query string) (*ODBCStmt, error) {
var out api.SQLHANDLE
ret := api.SQLAllocHandle(api.SQL_HANDLE_STMT, api.SQLHANDLE(c.h), &out)
if IsError(ret) {
return nil, NewError("SQLAllocHandle", c.h)
}
h := api.SQLHSTMT(out)
drv.Stats.updateHandleCount(api.SQL_HANDLE_STMT, 1)
b := api.StringToUTF16(query)
ret = api.SQLPrepare(h, (*api.SQLWCHAR)(unsafe.Pointer(&b[0])), api.SQL_NTS)
if IsError(ret) {
defer releaseHandle(h)
return nil, NewError("SQLPrepare", h)
}
ps, err := ExtractParameters(h)
if err != nil {
defer releaseHandle(h)
return nil, err
}
return &ODBCStmt{
h: h,
Parameters: ps,
usedByStmt: true,
}, nil
}
func (d *Driver) Open(dsn string) (driver.Conn, error) {
var out api.SQLHANDLE
ret := api.SQLAllocHandle(api.SQL_HANDLE_DBC, api.SQLHANDLE(d.h), &out)
if IsError(ret) {
return nil, NewError("SQLAllocHandle", d.h)
}
h := api.SQLHDBC(out)
drv.Stats.updateHandleCount(api.SQL_HANDLE_DBC, 1)
b := api.StringToUTF16(dsn)
ret = api.SQLDriverConnect(h, 0,
(*api.SQLWCHAR)(unsafe.Pointer(&b[0])), api.SQL_NTS,
nil, 0, nil, api.SQL_DRIVER_NOPROMPT)
if IsError(ret) {
defer releaseHandle(h)
return nil, NewError("SQLDriverConnect", h)
}
return &Conn{h: h}, nil
}
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
}