Read(char [ ], int, int)

This instance method reads a specified amount of characters from the current instance and populates the character array buffer.

Declaration

// C#
public int Read(char[ ] buffer, int offset, int count);

Parameters

buffer

The character array buffer that is populated.
offset

The offset (in characters) at which the buffer is populated.
count

The amount of characters to be read.

Return Value

The return value indicates the number of characters read from the CLOB.

Exceptions

ObjectDisposedException - The object is already disposed.

InvalidOperationException - The OracleConnection is not open or has been closed during the lifetime of the object.

ArgumentOutOfRangeException - This exception is thrown if any of the following conditions exist:

The offset or the count is less than 0.
The offset is greater than or equal to the buffer.Length.
The offset and the count together are greater than buffer.Length.

Remarks

Handles all CLOB and NCLOB data as Unicode.

The LOB data is read starting from the position specified by the Position property.

Example

// C#
 
using System;
using Oracle.DataAccess.Client;
using Oracle.DataAccess.Types;
 
class ReadSample
{
  static void Main()
  {
    string constr = "User Id=scott;Password=tiger;Data Source=oracle";
    OracleConnection con = new OracleConnection(constr);
    con.Open();
 
    OracleClob clob = new OracleClob(con);
    
    // Write 3 chars, starting at buffer offset 1
    char[] writeBuffer = new char[4] {'a', 'b', 'c', 'd'};
    clob.Write(writeBuffer, 1, 3);
 
    // Reset the Position (in bytes) for Read
    clob.Position = 2;
 
    // Read 2 chars into buffer starting at buffer offset 1
    char[] readBuffer = new char[4];    
    int charsRead = clob.Read(readBuffer, 1, 2);
 
    // Prints "charsRead  = 2"
    Console.WriteLine("charsRead  = " + charsRead);    
 
    // Prints "readBuffer =  cd "
    Console.Write("readBuffer = ");
    for(int index = 0; index <  readBuffer.Length; index++)
    {
      Console.Write(readBuffer[index]);
    }
    Console.WriteLine();
    
    clob.Close();
    clob.Dispose();
 
    con.Close();
    con.Dispose();
  }
}