299 lines
8.7 KiB
C#
299 lines
8.7 KiB
C#
//
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// System.Data.Common.DbDataReader.cs
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//
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// Author:
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// Tim Coleman (tim@timcoleman.com)
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//
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// Copyright (C) Tim Coleman, 2003
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//
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//
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// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System.Collections;
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using System.ComponentModel;
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using System.Data;
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using System.IO;
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#if NET_4_5
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using System.Threading;
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using System.Threading.Tasks;
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#endif
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namespace System.Data.Common {
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public abstract class DbDataReader : MarshalByRefObject, IDataReader, IDataRecord, IDisposable, IEnumerable
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{
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#region Constructors
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protected DbDataReader ()
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{
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}
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#endregion // Constructors
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#region Properties
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public abstract int Depth { get; }
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public abstract int FieldCount { get; }
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public abstract bool HasRows { get; }
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public abstract bool IsClosed { get; }
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public abstract object this [int ordinal] { get; }
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public abstract object this [string name] { get; }
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public abstract int RecordsAffected { get; }
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#if NET_2_0
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public virtual int VisibleFieldCount {
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get { return FieldCount; }
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}
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#endif
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#endregion // Properties
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#region Methods
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public abstract void Close ();
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public abstract bool GetBoolean (int ordinal);
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public abstract byte GetByte (int ordinal);
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public abstract long GetBytes (int ordinal, long dataOffset, byte[] buffer, int bufferOffset, int length);
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public abstract char GetChar (int ordinal);
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public abstract long GetChars (int ordinal, long dataOffset, char[] buffer, int bufferOffset, int length);
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[EditorBrowsable (EditorBrowsableState.Never)]
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public void Dispose ()
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{
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Dispose (true);
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}
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protected virtual void Dispose (bool disposing)
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{
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if (disposing)
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Close ();
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}
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#if NET_2_0
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[EditorBrowsable (EditorBrowsableState.Never)]
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public DbDataReader GetData (int ordinal)
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{
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return ((DbDataReader) this [ordinal]);
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}
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#endif
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public abstract string GetDataTypeName (int ordinal);
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public abstract DateTime GetDateTime (int ordinal);
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public abstract decimal GetDecimal (int ordinal);
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public abstract double GetDouble (int ordinal);
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[EditorBrowsable (EditorBrowsableState.Never)]
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public abstract IEnumerator GetEnumerator ();
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public abstract Type GetFieldType (int ordinal);
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public abstract float GetFloat (int ordinal);
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public abstract Guid GetGuid (int ordinal);
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public abstract short GetInt16 (int ordinal);
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public abstract int GetInt32 (int ordinal);
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public abstract long GetInt64 (int ordinal);
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public abstract string GetName (int ordinal);
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public abstract int GetOrdinal (string name);
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#if NET_2_0
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[EditorBrowsable (EditorBrowsableState.Never)]
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public virtual Type GetProviderSpecificFieldType (int ordinal)
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{
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return GetFieldType (ordinal);
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}
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[EditorBrowsable (EditorBrowsableState.Never)]
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public virtual object GetProviderSpecificValue (int ordinal)
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{
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return GetValue (ordinal);
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}
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[EditorBrowsable (EditorBrowsableState.Never)]
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public virtual int GetProviderSpecificValues (object[] values)
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{
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return GetValues (values);
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}
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protected virtual DbDataReader GetDbDataReader (int ordinal)
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{
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return ((DbDataReader) this [ordinal]);
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}
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#endif
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public abstract DataTable GetSchemaTable ();
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public abstract string GetString (int ordinal);
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public abstract object GetValue (int ordinal);
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public abstract int GetValues (object[] values);
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IDataReader IDataRecord.GetData (int ordinal)
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{
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return ((IDataReader) this).GetData (ordinal);
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}
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public abstract bool IsDBNull (int ordinal);
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public abstract bool NextResult ();
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public abstract bool Read ();
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internal static DataTable GetSchemaTableTemplate ()
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{
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Type booleanType = typeof (bool);
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Type stringType = typeof (string);
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Type intType = typeof (int);
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Type typeType = typeof (Type);
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Type shortType = typeof (short);
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DataTable schemaTable = new DataTable ("SchemaTable");
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schemaTable.Columns.Add ("ColumnName", stringType);
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schemaTable.Columns.Add ("ColumnOrdinal", intType);
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schemaTable.Columns.Add ("ColumnSize", intType);
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schemaTable.Columns.Add ("NumericPrecision", shortType);
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schemaTable.Columns.Add ("NumericScale", shortType);
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schemaTable.Columns.Add ("IsUnique", booleanType);
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schemaTable.Columns.Add ("IsKey", booleanType);
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schemaTable.Columns.Add ("BaseServerName", stringType);
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schemaTable.Columns.Add ("BaseCatalogName", stringType);
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schemaTable.Columns.Add ("BaseColumnName", stringType);
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schemaTable.Columns.Add ("BaseSchemaName", stringType);
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schemaTable.Columns.Add ("BaseTableName", stringType);
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schemaTable.Columns.Add ("DataType", typeType);
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schemaTable.Columns.Add ("AllowDBNull", booleanType);
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schemaTable.Columns.Add ("ProviderType", intType);
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schemaTable.Columns.Add ("IsAliased", booleanType);
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schemaTable.Columns.Add ("IsExpression", booleanType);
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schemaTable.Columns.Add ("IsIdentity", booleanType);
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schemaTable.Columns.Add ("IsAutoIncrement", booleanType);
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schemaTable.Columns.Add ("IsRowVersion", booleanType);
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schemaTable.Columns.Add ("IsHidden", booleanType);
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schemaTable.Columns.Add ("IsLong", booleanType);
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schemaTable.Columns.Add ("IsReadOnly", booleanType);
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return schemaTable;
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}
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#if NET_4_5
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public virtual T GetFieldValue<T> (int i)
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{
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return (T) GetValue (i);
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}
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public Task<T> GetFieldValueAsync<T> (int ordinal)
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{
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return GetFieldValueAsync<T> (ordinal, CancellationToken.None);
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}
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public virtual Task<T> GetFieldValueAsync<T> (int ordinal, CancellationToken cancellationToken)
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{
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if (cancellationToken.IsCancellationRequested) {
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return TaskHelper.CreateCanceledTask<T> ();
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}
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try {
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return Task.FromResult<T> (GetFieldValue<T> (ordinal));
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} catch (Exception e) {
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return TaskHelper.CreateExceptionTask<T> (e);
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}
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}
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public Task<bool> NextResultAsync ()
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{
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return NextResultAsync (CancellationToken.None);
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}
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public Task<bool> IsDBNullAsync (int ordinal)
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{
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return IsDBNullAsync (ordinal, CancellationToken.None);
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}
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public virtual Stream GetStream (int i)
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{
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long offset = 0L;
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byte [] buffer = new byte [1024 * 8];
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long read;
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MemoryStream memoryStream = new MemoryStream ();
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while ((read = this.GetBytes (i, offset, buffer, 0, buffer.Length)) > 0) {
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memoryStream.Write (buffer, 0, (int) read);
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offset += read;
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}
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memoryStream.Seek (0, SeekOrigin.Begin);
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return memoryStream;
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}
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public virtual TextReader GetTextReader (int i)
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{
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String value;
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if (IsDBNull (i))
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value = string.Empty;
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else
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value = this.GetString (i);
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return new StringReader (value);
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}
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public virtual Task<bool> IsDBNullAsync (int ordinal, CancellationToken cancellationToken)
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{
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if (cancellationToken.IsCancellationRequested) {
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return TaskHelper.CreateCanceledTask<bool> ();
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}
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try {
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return Task.FromResult (IsDBNull (ordinal));
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} catch (Exception e) {
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return TaskHelper.CreateExceptionTask<bool> (e);
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}
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}
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public virtual Task<bool> NextResultAsync (CancellationToken cancellationToken)
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{
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if (cancellationToken.IsCancellationRequested) {
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return TaskHelper.CreateCanceledTask<bool> ();
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}
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try {
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return Task.FromResult (NextResult ());
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} catch (Exception e) {
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return TaskHelper.CreateExceptionTask<bool> (e);
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}
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}
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public Task<bool> ReadAsync ()
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{
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return ReadAsync (CancellationToken.None);
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}
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public virtual Task<bool> ReadAsync (CancellationToken cancellationToken)
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{
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if (cancellationToken.IsCancellationRequested) {
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return TaskHelper.CreateCanceledTask<bool> ();
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}
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try {
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return Task.FromResult (Read ());
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} catch (Exception e) {
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return TaskHelper.CreateExceptionTask<bool> (e);
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}
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}
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#endif
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#endregion // Methods
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}
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}
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