mcs/class/System.Data.OracleClient/System.Data.OracleClient.Oci/OciLobLocator.cs

   1 //
   2 // OciLobLocator.cs
   3 //
   4 // Part of managed C#/.NET library System.Data.OracleClient.dll
   5 //
   6 // Part of the Mono class libraries at
   7 // mcs/class/System.Data.OracleClient/System.Data.OracleClient.Oci
   8 //
   9 // Assembly: System.Data.OracleClient.dll
  10 // Namespace: System.Data.OracleClient.Oci
  11 //
  12 // Author:
  13 //     Tim Coleman <tim@timcoleman.com>
  14 //
  15 // Copyright (C) Tim Coleman, 2003
  16 //
  17
  18 using System;
  19 using System.Data.OracleClient;
  20 using System.Runtime.InteropServices;
  21
  22 namespace System.Data.OracleClient.Oci {
  23         internal sealed class OciLobLocator : OciDescriptorHandle, IDisposable
  24         {
  25                 #region Fields
  26
  27                 bool disposed = false;
  28                 OciErrorHandle errorHandle;
  29                 OciServiceHandle service;
  30                 OciDataType type;
  31
  32                 #endregion // Fields
  33
  34                 #region Constructors
  35
  36                 public OciLobLocator (OciHandle parent, IntPtr handle)
  37                         : base (OciHandleType.LobLocator, parent, handle)
  38                 {
  39                 }
  40
  41                 #endregion // Constructors
  42
  43                 #region Properties
  44
  45                 public OciErrorHandle ErrorHandle {
  46                         get { return errorHandle; }
  47                         set { errorHandle = value; }
  48                 }
  49
  50                 public OciServiceHandle Service {
  51                         get { return service; }
  52                         set { service = value; }
  53                 }
  54
  55                 public OciDataType LobType {
  56                         get { return type; }
  57                         set { type = value; }
  58                 }
  59
  60                 #endregion // Properties
  61
  62                 #region Methods
  63
  64                 public void BeginBatch (OracleLobOpenMode mode)
  65                 {
  66                         int status = 0;
  67                         status = OciCalls.OCILobOpen (Service,
  68                                                 ErrorHandle,
  69                                                 Handle,
  70                                                 (byte) mode);
  71
  72                         if (status != 0) {
  73                                 OciErrorInfo info = ErrorHandle.HandleError ();
  74                                 throw new OracleException (info.ErrorCode, info.ErrorMessage);
  75                         }
  76                 }
  77
  78                 public uint Copy (OciLobLocator destination, uint amount, uint destinationOffset, uint sourceOffset)
  79                 {
  80                         OciCalls.OCILobCopy (Service,
  81                                         ErrorHandle,
  82                                         destination,
  83                                         Handle,
  84                                         amount,
  85                                         destinationOffset,
  86                                         sourceOffset);
  87                         return amount;
  88                 }
  89
  90                 protected override void Dispose (bool disposing)
  91                 {
  92                         if (!disposed) {
  93                                 disposed = true;
  94                                 base.Dispose ();
  95                         }
  96                 }
  97
  98                 public void EndBatch ()
  99                 {
 100                         int status = 0;
 101                         status = OciCalls.OCILobClose (Service, ErrorHandle, this);
 102
 103                         if (status != 0) {
 104                                 OciErrorInfo info = ErrorHandle.HandleError ();
 105                                 throw new OracleException (info.ErrorCode, info.ErrorMessage);
 106                         }
 107                 }
 108
 109                 public uint Erase (uint offset, uint amount)
 110                 {
 111                         int status = 0;
 112                         uint output = amount;
 113                         status = OciCalls.OCILobErase (Service,
 114                                                 ErrorHandle,
 115                                                 this,
 116                                                 ref output,
 117                                                 (uint) offset);
 118
 119                         if (status != 0) {
 120                                 OciErrorInfo info = ErrorHandle.HandleError ();
 121                                 throw new OracleException (info.ErrorCode, info.ErrorMessage);
 122                         }
 123
 124                         return output;
 125                 }
 126
 127                 public int GetChunkSize ()
 128                 {
 129                         int status = 0;
 130                         uint output;
 131                         status = OciCalls.OCILobGetChunkSize (Service,
 132                                                         ErrorHandle,
 133                                                         this,
 134                                                         out output);
 135
 136                         if (status != 0) {
 137                                 OciErrorInfo info = ErrorHandle.HandleError ();
 138                                 throw new OracleException (info.ErrorCode, info.ErrorMessage);
 139                         }
 140
 141                         return (int) output;
 142                 }
 143
 144                 public long GetLength (bool binary)
 145                 {
 146                         int status = 0;
 147                         uint output;
 148                         status = OciCalls.OCILobGetLength (Service,
 149                                                 ErrorHandle,
 150                                                 this,
 151                                                 out output);
 152                         if (status != 0) {
 153                                 OciErrorInfo info = ErrorHandle.HandleError ();
 154                                 throw new OracleException (info.ErrorCode, info.ErrorMessage);
 155                         }
 156
 157                         if (!binary)
 158                                 output *= 2;
 159
 160                         return (long) output;
 161                 }
 162
 163                 public int Read (byte[] buffer, uint offset, uint count, bool binary)
 164                 {
 165                         int status = 0;
 166                         uint amount = count;
 167
 168                         // Character types are UTF-16, so amount of characters is 1/2
 169                         // the amount of bytes
 170                         if (!binary)
 171                                 amount /= 2;
 172
 173                         status = OciCalls.OCILobRead (Service,
 174                                                 ErrorHandle,
 175                                                 this,
 176                                                 ref amount,
 177                                                 offset,
 178                                                 buffer,
 179                                                 count,
 180                                                 IntPtr.Zero,
 181                                                 IntPtr.Zero,
 182                                                 1000,  // OCI_UCS2ID
 183                                                 0);    // Ignored if csid is specified as above
 184
 185                         if (status != 0) {
 186                                 OciErrorInfo info = ErrorHandle.HandleError ();
 187                                 throw new OracleException (info.ErrorCode, info.ErrorMessage);
 188                         }
 189
 190                         return (int) amount;
 191                 }
 192
 193                 public void Trim (uint newlen)
 194                 {
 195                         int status = 0;
 196                         status = OciCalls.OCILobTrim (Service,
 197                                                 ErrorHandle,
 198                                                 this,
 199                                                 newlen);
 200
 201                         if (status != 0) {
 202                                 OciErrorInfo info = ErrorHandle.HandleError ();
 203                                 throw new OracleException (info.ErrorCode, info.ErrorMessage);
 204                         }
 205
 206                 }
 207
 208                 public int Write (byte[] buffer, uint offset, uint count, OracleType type)
 209                 {
 210                         int status = 0;
 211                         uint amount = count;
 212
 213                         if (type == OracleType.Clob)
 214                                 amount /= 2;
 215
 216                         status = OciCalls.OCILobWrite (Service,
 217                                                 ErrorHandle,
 218                                                 this,
 219                                                 ref amount,
 220                                                 offset,
 221                                                 buffer,
 222                                                 count,
 223                                                 0,    // OCI_ONE_PIECE
 224                                                 IntPtr.Zero,
 225                                                 IntPtr.Zero,
 226                                                 1000, // OCI_UCS2ID
 227                                                 0);
 228
 229                         if (status != 0) {
 230                                 OciErrorInfo info = ErrorHandle.HandleError ();
 231                                 throw new OracleException (info.ErrorCode, info.ErrorMessage);
 232                         }
 233
 234                         return (int) amount;
 235                 }
 236
 237                 #endregion // Methods
 238         }
 239 }