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data_set.go
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data_set.go
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package go_ora
import (
"database/sql/driver"
"github.com/sijms/go-ora/trace"
"io"
"github.com/sijms/go-ora/network"
)
// Compile time Sentinels for implemented Interfaces.
var _ = driver.Rows((*DataSet)(nil))
var _ = driver.RowsColumnTypeDatabaseTypeName((*DataSet)(nil))
var _ = driver.RowsColumnTypeLength((*DataSet)(nil))
var _ = driver.RowsColumnTypeNullable((*DataSet)(nil))
// var _ = driver.RowsColumnTypePrecisionScale((*DataSet)(nil))
// var _ = driver.RowsColumnTypeScanType((*DataSet)(nil))
// var _ = driver.RowsNextResultSet((*DataSet)(nil))
type Row []driver.Value
type DataSet struct {
ColumnCount int
RowCount int
UACBufferLength int
MaxRowSize int
Cols []ParameterInfo
Rows []Row
//currentRow Row
index int
parent StmtInterface
}
func (dataSet *DataSet) load(session *network.Session) error {
_, err := session.GetByte()
if err != nil {
return err
}
columnCount, err := session.GetInt(2, true, true)
if err != nil {
return err
}
num, err := session.GetInt(4, true, true)
if err != nil {
return err
}
columnCount += num * 0x100
if columnCount > dataSet.ColumnCount {
dataSet.ColumnCount = columnCount
}
//if len(dataSet.currentRow) != dataSet.columnCount {
// dataSet.currentRow = make(Row, dataSet.columnCount)
//}
dataSet.RowCount, err = session.GetInt(4, true, true)
if err != nil {
return err
}
dataSet.UACBufferLength, err = session.GetInt(2, true, true)
if err != nil {
return err
}
bitVector, err := session.GetDlc()
if err != nil {
return err
}
dataSet.setBitVector(bitVector)
_, err = session.GetDlc()
return nil
}
func (dataSet *DataSet) setBitVector(bitVector []byte) {
index := dataSet.ColumnCount / 8
if dataSet.ColumnCount%8 > 0 {
index++
}
if len(bitVector) > 0 {
for x := 0; x < len(bitVector); x++ {
for i := 0; i < 8; i++ {
if (x*8)+i < dataSet.ColumnCount {
dataSet.Cols[(x*8)+i].getDataFromServer = bitVector[x]&(1<<i) > 0
}
}
}
} else {
for x := 0; x < len(dataSet.Cols); x++ {
dataSet.Cols[x].getDataFromServer = true
}
}
}
func (dataSet *DataSet) Close() error {
return nil
}
func (dataSet *DataSet) Next(dest []driver.Value) error {
//fmt.Println("has more row: ", dataSet.parent.hasMoreRows)
//fmt.Println("row length: ", len(dataSet.rows))
//fmt.Println("cursor id: ", dataSet.parent.cursorID)
//if dataSet.parent.hasMoreRows && dataSet.index == len(dataSet.rows) && len(dataSet.rows) < dataSet.parent.noOfRowsToFetch {
// fmt.Println("inside first fetch")
// oldFetchCount := dataSet.parent.noOfRowsToFetch;
// dataSet.parent.noOfRowsToFetch = oldFetchCount - len(dataSet.rows)
// err := dataSet.parent.fetch(dataSet)
// if err != nil {
// return err
// }
// dataSet.parent.noOfRowsToFetch = oldFetchCount
// fmt.Println("row count after first fetch: ", len(dataSet.rows))
//}
hasMoreRows := dataSet.parent.hasMoreRows()
noOfRowsToFetch := len(dataSet.Rows) // dataSet.parent.noOfRowsToFetch()
hasBLOB := dataSet.parent.hasBLOB()
hasLONG := dataSet.parent.hasLONG()
if !hasMoreRows && noOfRowsToFetch == 0 {
return io.EOF
}
if dataSet.index > 0 && dataSet.index%len(dataSet.Rows) == 0 {
if hasMoreRows {
dataSet.Rows = make([]Row, 0, dataSet.parent.noOfRowsToFetch())
err := dataSet.parent.fetch(dataSet)
if err != nil {
return err
}
noOfRowsToFetch = len(dataSet.Rows)
hasMoreRows = dataSet.parent.hasMoreRows()
dataSet.index = 0
if !hasMoreRows && noOfRowsToFetch == 0 {
return io.EOF
}
} else {
return io.EOF
}
}
//if hasMoreRows && dataSet.index != 0 && dataSet.index%noOfRowsToFetch == 0 {
//
//}
if hasMoreRows && (hasBLOB || hasLONG) && dataSet.index == 0 {
if err := dataSet.parent.fetch(dataSet); err != nil {
return err
}
}
if dataSet.index%noOfRowsToFetch < len(dataSet.Rows) {
for x := 0; x < len(dataSet.Rows[dataSet.index%noOfRowsToFetch]); x++ {
dest[x] = dataSet.Rows[dataSet.index%noOfRowsToFetch][x]
}
dataSet.index++
return nil
}
return io.EOF
}
//func (dataSet *DataSet) NextRow(args... interface{}) error {
// var values = make([]driver.Value, len(args))
// err := dataSet.Next(values)
// if err != nil {
// return err
// }
// for index, arg := range args {
// *arg = values[index]
// //if val, ok := values[index].(t); !ok {
// //
// //}
// }
// return nil
//}
func (dataSet *DataSet) Columns() []string {
if len(dataSet.Cols) == 0 {
return nil
}
ret := make([]string, len(dataSet.Cols))
for x := 0; x < len(dataSet.Cols); x++ {
ret[x] = dataSet.Cols[x].Name
}
return ret
}
func (dataSet DataSet) Trace(t trace.Tracer) {
for r, row := range dataSet.Rows {
if r > 25 {
break
}
t.Printf("Row %d", r)
for c, col := range dataSet.Cols {
t.Printf(" %-20s: %v", col.Name, row[c])
}
}
}
func (dataSet DataSet) ColumnTypeDatabaseTypeName(index int) string {
return dataSet.Cols[index].DataType.String()
}
func (dataSet DataSet) ColumnTypeLength(index int) (length int64, ok bool) {
switch dataSet.Cols[index].DataType {
case NCHAR, CHAR:
return int64(dataSet.Cols[index].MaxCharLen), true
case NUMBER:
return int64(dataSet.Cols[index].Precision), true
}
return int64(0), false
}
func (dataSet DataSet) ColumnTypeNullable(index int) (nullable, ok bool) {
return dataSet.Cols[index].AllowNull, true
}