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|
package clickhouse
import (
"database/sql/driver"
"fmt"
"io"
"reflect"
"sync"
"time"
"github.com/ClickHouse/clickhouse-go/lib/column"
"github.com/ClickHouse/clickhouse-go/lib/data"
"github.com/ClickHouse/clickhouse-go/lib/protocol"
)
type rows struct {
ch *clickhouse
err error
mutex sync.RWMutex
finish func()
offset int
block *data.Block
totals *data.Block
extremes *data.Block
stream chan *data.Block
columns []string
blockColumns []column.Column
}
func (rows *rows) Columns() []string {
return rows.columns
}
func (rows *rows) ColumnTypeScanType(idx int) reflect.Type {
return rows.blockColumns[idx].ScanType()
}
func (rows *rows) ColumnTypeDatabaseTypeName(idx int) string {
return rows.blockColumns[idx].CHType()
}
func (rows *rows) Next(dest []driver.Value) error {
if rows.block == nil || int(rows.block.NumRows) <= rows.offset {
switch block, ok := <-rows.stream; true {
case !ok:
if err := rows.error(); err != nil {
return err
}
return io.EOF
default:
rows.block = block
rows.offset = 0
}
}
for i := range dest {
dest[i] = rows.block.Values[i][rows.offset]
}
rows.offset++
return nil
}
func (rows *rows) HasNextResultSet() bool {
return rows.totals != nil || rows.extremes != nil
}
func (rows *rows) NextResultSet() error {
switch {
case rows.totals != nil:
rows.block = rows.totals
rows.offset = 0
rows.totals = nil
case rows.extremes != nil:
rows.block = rows.extremes
rows.offset = 0
rows.extremes = nil
default:
return io.EOF
}
return nil
}
func (rows *rows) receiveData() error {
defer close(rows.stream)
var (
err error
packet uint64
progress *progress
profileInfo *profileInfo
)
for {
if packet, err = rows.ch.decoder.Uvarint(); err != nil {
return rows.setError(err)
}
switch packet {
case protocol.ServerException:
rows.ch.logf("[rows] <- exception")
return rows.setError(rows.ch.exception())
case protocol.ServerProgress:
if progress, err = rows.ch.progress(); err != nil {
return rows.setError(err)
}
rows.ch.logf("[rows] <- progress: rows=%d, bytes=%d, total rows=%d",
progress.rows,
progress.bytes,
progress.totalRows,
)
case protocol.ServerProfileInfo:
if profileInfo, err = rows.ch.profileInfo(); err != nil {
return rows.setError(err)
}
rows.ch.logf("[rows] <- profiling: rows=%d, bytes=%d, blocks=%d", profileInfo.rows, profileInfo.bytes, profileInfo.blocks)
case protocol.ServerData, protocol.ServerTotals, protocol.ServerExtremes:
var (
block *data.Block
begin = time.Now()
)
if block, err = rows.ch.readBlock(); err != nil {
return rows.setError(err)
}
rows.ch.logf("[rows] <- data: packet=%d, columns=%d, rows=%d, elapsed=%s", packet, block.NumColumns, block.NumRows, time.Since(begin))
if block.NumRows == 0 {
continue
}
switch packet {
case protocol.ServerData:
rows.stream <- block
case protocol.ServerTotals:
rows.totals = block
case protocol.ServerExtremes:
rows.extremes = block
}
case protocol.ServerEndOfStream:
rows.ch.logf("[rows] <- end of stream")
return nil
default:
rows.ch.conn.Close()
rows.ch.logf("[rows] unexpected packet [%d]", packet)
return rows.setError(fmt.Errorf("[rows] unexpected packet [%d] from server", packet))
}
}
}
func (rows *rows) Close() error {
rows.ch.logf("[rows] close")
rows.columns = nil
for range rows.stream {
}
rows.finish()
return nil
}
func (rows *rows) error() error {
rows.mutex.RLock()
defer rows.mutex.RUnlock()
return rows.err
}
func (rows *rows) setError(err error) error {
rows.mutex.Lock()
rows.err = err
rows.mutex.Unlock()
return err
}
func (rows *rows) ColumnTypeNullable(idx int) (nullable, ok bool) {
_, ok = rows.blockColumns[idx].(*column.Nullable)
return ok, true
}
func (rows *rows) ColumnTypePrecisionScale(idx int) (precision, scale int64, ok bool) {
decimalVal, ok := rows.blockColumns[idx].(*column.Decimal)
if !ok {
if nullable, nullOk := rows.blockColumns[idx].(*column.Nullable); nullOk {
decimalVal, ok = nullable.GetColumn().(*column.Decimal)
}
}
if ok {
return int64(decimalVal.GetPrecision()), int64(decimalVal.GetScale()), ok
}
return 0, 0, false
}
|
