/
ref_cursor.go
188 lines (184 loc) · 4.16 KB
/
ref_cursor.go
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package go_ora
import (
"database/sql/driver"
"github.com/charankamarapu/go-ora/v2/network"
)
type RefCursor struct {
defaultStmt
len uint8
MaxRowSize int
parent *defaultStmt
}
func (cursor *RefCursor) load() error {
// initialize ref cursor object
cursor.text = ""
cursor._hasLONG = false
cursor._hasBLOB = false
cursor._hasReturnClause = false
cursor.disableCompression = false
cursor.arrayBindCount = 1
cursor.scnForSnapshot = make([]int, 2)
cursor.stmtType = SELECT
session := cursor.connection.session
var err error
cursor.len, err = session.GetByte()
if err != nil {
return err
}
cursor.MaxRowSize, err = session.GetInt(4, true, true)
if err != nil {
return err
}
columnCount, err := session.GetInt(4, true, true)
if err != nil {
return err
}
if columnCount > 0 {
cursor.columns = make([]ParameterInfo, columnCount)
_, err = session.GetByte()
if err != nil {
return err
}
for x := 0; x < len(cursor.columns); x++ {
err = cursor.columns[x].load(cursor.connection)
if err != nil {
return err
}
if cursor.columns[x].DataType == OCIClobLocator || cursor.columns[x].DataType == OCIBlobLocator {
cursor._hasBLOB = true
}
if cursor.columns[x].DataType == LONG || cursor.columns[x].DataType == LongRaw {
cursor._hasLONG = true
}
}
}
_, err = session.GetDlc()
if err != nil {
return err
}
if session.TTCVersion >= 3 {
_, err = session.GetInt(4, true, true)
if err != nil {
return err
}
_, err = session.GetInt(4, true, true)
if err != nil {
return err
}
}
if session.TTCVersion >= 4 {
_, err = session.GetInt(4, true, true)
if err != nil {
return err
}
_, err = session.GetInt(4, true, true)
if err != nil {
return err
}
}
if session.TTCVersion >= 5 {
_, err = session.GetDlc()
if err != nil {
return err
}
}
cursor.cursorID, err = session.GetInt(4, true, true)
if err != nil {
return err
}
return nil
}
func (cursor *RefCursor) getExeOptions() int {
if cursor.connection.connOption.Lob == 0 {
return 0x8050
} else {
return 0x8040
}
}
func (cursor *RefCursor) _query() (*DataSet, error) {
session := cursor.connection.session
session.ResetBuffer()
err := cursor.write()
if err != nil {
return nil, err
}
dataSet := new(DataSet)
err = cursor.read(dataSet)
if err != nil {
return nil, err
}
// read lobs
//if cursor.connection.connOption.Lob != 0 {
// err = cursor.readLobs(dataSet)
// if err != nil {
// return nil, err
// }
//}
err = cursor.decodePrim(dataSet)
if err != nil {
return nil, err
}
return dataSet, nil
}
func (cursor *RefCursor) Query() (*DataSet, error) {
if cursor.connection.State != Opened {
return nil, &network.OracleError{ErrCode: 6413, ErrMsg: "ORA-06413: Connection not open"}
}
tracer := cursor.connection.connOption.Tracer
tracer.Printf("Query RefCursor: %d", cursor.cursorID)
cursor._noOfRowsToFetch = cursor.connection.connOption.PrefetchRows
cursor._hasMoreRows = true
if len(cursor.parent.scnForSnapshot) > 0 {
copy(cursor.scnForSnapshot, cursor.parent.scnForSnapshot)
}
failOver := cursor.connection.connOption.Failover
if failOver == 0 {
failOver = 1
}
dataSet, err := cursor._query()
if err != nil {
if isBadConn(err) {
tracer.Print("Error: ", err)
return nil, driver.ErrBadConn
}
return nil, err
}
return dataSet, nil
//var dataSet *DataSet
//var err error
//var reconnect bool
//for writeTrials := 0; writeTrials < failOver; writeTrials++ {
// reconnect, err = cursor.connection.reConnect(nil, writeTrials+1)
// if err != nil {
// tracer.Print("Error: ", err)
// if !reconnect {
// return nil, err
// }
// continue
// }
// // call query
// dataSet, err = cursor._query()
// if err == nil {
// break
// }
// reconnect, err = cursor.connection.reConnect(err, writeTrials+1)
// if err != nil {
// tracer.Print("Error: ", err)
// if !reconnect {
// return nil, err
// }
// }
//}
//return dataSet, nil
}
func (cursor *RefCursor) write() error {
var define = false
if cursor.connection.connOption.Lob == 0 {
define = true
}
err := cursor.basicWrite(cursor.getExeOptions(), false, define)
if err != nil {
return err
}
return cursor.connection.session.Write()
}