func (c *ClientConn) writePrepare(s *Stmt) error {
data := make([]byte, 4, 128)
//status ok
data = append(data, 0)
//stmt id
data = append(data, mysql.Uint32ToBytes(s.id)...)
//number columns
data = append(data, mysql.Uint16ToBytes(uint16(s.columns))...)
//number params
data = append(data, mysql.Uint16ToBytes(uint16(s.params))...)
//filter [00]
data = append(data, 0)
//warning count
data = append(data, 0, 0)
if err := c.writePacket(data); err != nil {
return err
}
if s.params > 0 {
for i := 0; i < s.params; i++ {
data = data[0:4]
data = append(data, []byte(paramFieldData)...)
if err := c.writePacket(data); err != nil {
return err
}
}
if err := c.writeEOF(c.status); err != nil {
return err
}
}
if s.columns > 0 {
for i := 0; i < s.columns; i++ {
data = data[0:4]
data = append(data, []byte(columnFieldData)...)
if err := c.writePacket(data); err != nil {
return err
}
}
if err := c.writeEOF(c.status); err != nil {
return err
}
}
return nil
}
func (s *Stmt) write(args ...interface{}) error {
paramsNum := s.params
if len(args) != paramsNum {
return fmt.Errorf("argument mismatch, need %d but got %d", s.params, len(args))
}
paramTypes := make([]byte, paramsNum<<1)
paramValues := make([][]byte, paramsNum)
//NULL-bitmap, length: (num-params+7)
nullBitmap := make([]byte, (paramsNum+7)>>3)
var length int = int(1 + 4 + 1 + 4 + ((paramsNum + 7) >> 3) + 1 + (paramsNum << 1))
var newParamBoundFlag byte = 0
for i := range args {
if args[i] == nil {
nullBitmap[i/8] |= (1 << (uint(i) % 8))
paramTypes[i<<1] = mysql.MYSQL_TYPE_NULL
continue
}
newParamBoundFlag = 1
switch v := args[i].(type) {
case int8:
paramTypes[i<<1] = mysql.MYSQL_TYPE_TINY
paramValues[i] = []byte{byte(v)}
case int16:
paramTypes[i<<1] = mysql.MYSQL_TYPE_SHORT
paramValues[i] = mysql.Uint16ToBytes(uint16(v))
case int32:
paramTypes[i<<1] = mysql.MYSQL_TYPE_LONG
paramValues[i] = mysql.Uint32ToBytes(uint32(v))
case int:
paramTypes[i<<1] = mysql.MYSQL_TYPE_LONGLONG
paramValues[i] = mysql.Uint64ToBytes(uint64(v))
case int64:
paramTypes[i<<1] = mysql.MYSQL_TYPE_LONGLONG
paramValues[i] = mysql.Uint64ToBytes(uint64(v))
case uint8:
paramTypes[i<<1] = mysql.MYSQL_TYPE_TINY
paramTypes[(i<<1)+1] = 0x80
paramValues[i] = []byte{v}
case uint16:
paramTypes[i<<1] = mysql.MYSQL_TYPE_SHORT
paramTypes[(i<<1)+1] = 0x80
paramValues[i] = mysql.Uint16ToBytes(uint16(v))
case uint32:
paramTypes[i<<1] = mysql.MYSQL_TYPE_LONG
paramTypes[(i<<1)+1] = 0x80
paramValues[i] = mysql.Uint32ToBytes(uint32(v))
case uint:
paramTypes[i<<1] = mysql.MYSQL_TYPE_LONGLONG
paramTypes[(i<<1)+1] = 0x80
paramValues[i] = mysql.Uint64ToBytes(uint64(v))
case uint64:
paramTypes[i<<1] = mysql.MYSQL_TYPE_LONGLONG
paramTypes[(i<<1)+1] = 0x80
paramValues[i] = mysql.Uint64ToBytes(uint64(v))
case bool:
paramTypes[i<<1] = mysql.MYSQL_TYPE_TINY
if v {
paramValues[i] = []byte{1}
} else {
paramValues[i] = []byte{0}
}
case float32:
paramTypes[i<<1] = mysql.MYSQL_TYPE_FLOAT
paramValues[i] = mysql.Uint32ToBytes(math.Float32bits(v))
case float64:
paramTypes[i<<1] = mysql.MYSQL_TYPE_DOUBLE
paramValues[i] = mysql.Uint64ToBytes(math.Float64bits(v))
case string:
paramTypes[i<<1] = mysql.MYSQL_TYPE_STRING
paramValues[i] = append(mysql.PutLengthEncodedInt(uint64(len(v))), v...)
case []byte:
paramTypes[i<<1] = mysql.MYSQL_TYPE_STRING
paramValues[i] = append(mysql.PutLengthEncodedInt(uint64(len(v))), v...)
default:
return fmt.Errorf("invalid argument type %T", args[i])
}
length += len(paramValues[i])
}
data := make([]byte, 4, 4+length)
data = append(data, mysql.COM_STMT_EXECUTE)
data = append(data, byte(s.id), byte(s.id>>8), byte(s.id>>16), byte(s.id>>24))
//flag: CURSOR_TYPE_NO_CURSOR
data = append(data, 0x00)
//iteration-count, always 1
data = append(data, 1, 0, 0, 0)
if s.params > 0 {
data = append(data, nullBitmap...)
//new-params-bound-flag
data = append(data, newParamBoundFlag)
if newParamBoundFlag == 1 {
//type of each parameter, length: num-params * 2
data = append(data, paramTypes...)
//value of each parameter
for _, v := range paramValues {
data = append(data, v...)
}
}
}
s.conn.pkg.Sequence = 0
return s.conn.writePacket(data)
}