How to insert CLOB field in Oracle using C#

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Dear all,
I've a problem that i can't solved. I wanna insert data (XML) into a clob field and when i tried to write data into clob, its return an error.
This is my code :

C#

class clsOracle
  {
    private System.Data.OracleClient.OracleConnection connOracle;
    private System.Data.OracleClient.OracleDataReader rstOracle;
    private System.Data.OracleClient.OracleCommand sqlCommandOracle;
    private System.Data.OracleClient.OracleTransaction txn;
    private System.Data.OracleClient.OracleLob clob;

    public clsOracle()
    {
      string OracleServerAkses = "Data Source=(DESCRIPTION="
           + "(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=10.111.3.54)(PORT=1521)))"
           + "(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=kseistpd)));"
           + "User Id=AKSES;Password=password;";
      connOracle = new System.Data.OracleClient.OracleConnection(OracleServerAkses);
      connOracle.Open();
    }

    public void InsertRecord(string SQLStatement)
    {
      if (SQLStatement.Length > 0)
      {
        if (connOracle.State.ToString().Equals("Open"))
        {
          sqlCommandOracle =
            new System.Data.OracleClient.OracleCommand(SQLStatement, connOracle);
          sqlCommandOracle.ExecuteScalar();
        }
      }
    }

    public void InsertCLOB(string SQLStatement, string str)
    {
      if (SQLStatement.Length > 0)
      {
        if (connOracle.State.ToString().Equals("Open"))
        {
          byte[] newvalue = System.Text.Encoding.Unicode.GetBytes(str);
          sqlCommandOracle =
            new System.Data.OracleClient.OracleCommand(SQLStatement, connOracle);
          rstOracle = sqlCommandOracle.ExecuteReader();
          rstOracle.Read();
          txn = connOracle.BeginTransaction();
          clob = rstOracle.GetOracleLob(0);
          clob.Write(newvalue, 0, newvalue.Length);
          txn.Commit();
        }
      }
    }
    public void CloseDatabase()
    {
      connOracle.Close();
      connOracle.Dispose();
    }
  }

And this is the main class :

C#

static void Main(string[] args)
    {
      clsOracle db = new clsOracle();
      string guid = "guid12";
      string sql = "INSERT INTO T_CLOB(GUID, MEMBERID, INPUT_DATE) VALUES('" +
        guid + "' , 'BCA02', sysdate)";
      db.InsertRecord(sql);
      sql = "SELECT MESSAGES FROM T_CLOB WHERE GUID='" + guid + "' FOR UPDATE";
      db.InsertCLOB(sql, data);
      db.CloseDatabase();}

Fields of table in my database (Oracle) :
1. GUID (varchar2)
2. MESSAGES (clob)
3. INPUT_DATE (varhcar2)

Please help me.. :~:~

Posted 9-Nov-10 17:30pm

Teamsar Muliadi

Updated 9-Nov-10 17:33pm

v2

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TweakBird · Answer 1 · 2010-11-09T22:15:00

Modify Sql Statement in Main()

Sql= "INSERT INTO T_CLOB(GUID,MESSAGES,INPUT_DATE) VALUES('" + guid + "' , :message, sysdate)";

Change InsertClob Method

OracleCommand command = new OracleCommand(SQLStatement, connOracle)
 command.Parameters.Add(":message", OracleDbType.Clob, messageClobValue, ParameterDirection.Input);

command.ExecuteNonQuery();

try it once. and also have a look on this
http://dotnetchris.wordpress.com/2008/04/10/writting-lobs-clobs-to-oracle-using-c-aspnet-20[^]

http://msdn.microsoft.com/en-us/library/cydxhzhz(VS.80).asp[^]

mahsal · Answer 2 · 2011-01-11T16:52:00

Solution 2

Hi All,

I am trying to insert xml to a Clob via C#,SQL/Oracle , I tried this code and many other version , is there any example that someone has tested it itself and works properly to post here?

I really appreciate your help if someone could help me regarding this.

Thanks in advance

Posted 11-Jan-11 16:52pm

mahsal

Comments

Teamsar Muliadi 12-Jan-11 2:39am

You can try this one :

public void DoInsertDataIncomingMsg(object sender)
{
OracleConnection objCon = new OracleConnection(CReaderConfig.StructureAppSettings.connStringAkses);
try
{
objCon.Open();
oTransc = objCon.BeginTransaction(IsolationLevel.Unspecified);
//oTransc.IsolationLevel = IsolationLevel.ReadCommitted;
oCommand = objCon.CreateCommand();
oCommand.Transaction = oTransc;
if (oCommand.Transaction == null)
{
log.Debug("Transaction 1 is null");
}
oCommand.CommandText = CQuery.Q_INSERT_INTO_T_INCOMING_MSGS(((CCommonStruct)sender).incoming_date,
((CCommonStruct)sender).membercode, ((CCommonStruct)sender).status_code,
((CCommonStruct)sender).getReferenceID);
oCommand.ExecuteScalar();

byte[] newvalue = System.Text.Encoding.Unicode.GetBytes(((CCommonStruct)sender).get_clob_messages);
log.Debug("New value : " + System.Text.Encoding.Unicode.GetString(newvalue));
log.Debug("Reference ID : " + ((CCommonStruct)sender).getReferenceID);

oCommand.CommandText = CQuery.Q_UPDATE_T_INCOMING_MSGS(((CCommonStruct)sender).getReferenceID);
if (oCommand.Transaction == null)
{
log.Debug("Transaction 2 is null");
}
using (OracleDataReader reader = oCommand.ExecuteReader())
{
reader.Read();
global::System.Data.OracleClient.OracleLob clob = reader.GetOracleLob(0);
clob.Write(newvalue, 0, newvalue.Length);
}
oTransc.Commit();
}
catch (Exception ex)
{
oTransc.Rollback();
log.Debug("Error while executing DoInsertDataIncomingMsg for Reference ID : " + ((CCommonStruct)sender).getReferenceID, ex);
}
finally
{
if (objCon != null)
{
objCon.Close();
oTransc.Dispose();
}
}
}

Muhammad Saeed Ahmad · Answer 3 · 2014-02-02T23:08:00

Solution 3

There are 2 steps for inserting data to clob field,

1. Insert the record
2. Open the same row with FOR UPDATE clause and execute the above line of code

The problem is while inserting record don't ignore CLOB field, instead use EMPTY_CLOB() in Insert statement as value for CLOB field.

Posted 2-Feb-14 23:08pm

Muhammad Saeed Ahmad