Problem when listing CLOB fields, it doesn't bring all the bytes.

[fitlcarlos]

I have a query with several fields and these fields are of type string, date, int and clob and this query will return several rows.

I'm running a DB.query and returning the rows, but the CLob field is already returned to me as a string in the row and does not contain all the bytes of the CLb.

Note: I can't type my fields as go_ora.clob because of my logic.

The logic is as follows:

func Open(){
  
  var dataset []map[string]*any  
  
  rows, err = ds.Connection.DB.Query(query, ds.GetParams()...)
  
  fieldTypes, _ := rows.ColumnTypes()
  fields, _ := rows.Columns()
  
  for rows.Next() {
     columns := make([]any, len(fields))    

     for i := 0; i < len(columns); i++ {
       columns[i] = &columns[i]
     }
     
     err := rows.Scan(columns...)  // <--- Here the CLob column already has a string
     
     if err != nil {
       print(err)
     }
     
     line := make(map[string]*any)

     for i := 0; i < len(columns); i++ {
       line[strings.ToUpper(fields[i])] = columns[i]
     }
  
     dataset = append(dataset, line)
  }   
}

columns[0] <----- Here it already brings me the CLob column as a string because the field type is ANY.

Internally in go_ora, it cannot identify that the field is of type OCIClobLocator and perform the correct conversion bringing all the CLob bytes?

[sijms]

Hi @fitlcarlos
sorry for late replay
according to this doc of scanner interface oracle types should by mapped to one of the following:

// int64
// float64
// bool
// []byte
// string
// time.Time
// nil - for NULL values

so these oracle types will be converted internally into the corresponding go types

oracle type	go type
CLOB	string
NCLOB	string
BLOB	[]byte

if your data is larger than 32kb so you should use url option lob fetch=post it is not the default option because it slightly slow down the query. (note default will return clob as varchar2 and nclob as nvarchar2 and blob as raw)

[sijms]

I am working on increase number of bytes received during lob prefetch from 32KB to 1 GB (same as official drivers)

[fitlcarlos]

I am working on increase number of bytes received during lob prefetch from 32KB to 1 GB (same as official drivers)

Thank's

[sijms]

fixed in v2.8.8