69 lines
2.7 KiB
C#
69 lines
2.7 KiB
C#
//-----------------------------------------------------------------------
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// <copyright file="Int16ColumnValue.cs" company="Microsoft Corporation">
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// Copyright (c) Microsoft Corporation.
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// </copyright>
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//-----------------------------------------------------------------------
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namespace Microsoft.Isam.Esent.Interop
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{
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using System;
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using System.Diagnostics;
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/// <summary>
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/// An <see cref="short"/> column value.
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/// </summary>
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public class Int16ColumnValue : ColumnValueOfStruct<short>
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{
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/// <summary>
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/// Gets the size of the value in the column. This returns 0 for
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/// variable sized columns (i.e. binary and string).
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/// </summary>
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protected override int Size
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{
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[DebuggerStepThrough]
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get { return sizeof(short); }
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}
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/// <summary>
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/// Recursive SetColumns method for data pinning. This populates the buffer and
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/// calls the inherited SetColumns method.
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/// </summary>
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/// <param name="sesid">The session to use.</param>
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/// <param name="tableid">
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/// The table to set the columns in. An update should be prepared.
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/// </param>
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/// <param name="columnValues">
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/// Column values to set.
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/// </param>
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/// <param name="nativeColumns">
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/// Structures to put the pinned data in.
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/// </param>
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/// <param name="i">Offset of this object in the array.</param>
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/// <returns>An error code.</returns>
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internal override unsafe int SetColumns(JET_SESID sesid, JET_TABLEID tableid, ColumnValue[] columnValues, NATIVE_SETCOLUMN* nativeColumns, int i)
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{
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var data = this.Value.GetValueOrDefault();
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return this.SetColumns(sesid, tableid, columnValues, nativeColumns, i, &data, sizeof(short), this.Value.HasValue);
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}
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/// <summary>
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/// Given data retrieved from ESENT, decode the data and set the value in the ColumnValue object.
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/// </summary>
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/// <param name="value">An array of bytes.</param>
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/// <param name="startIndex">The starting position within the bytes.</param>
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/// <param name="count">The number of bytes to decode.</param>
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/// <param name="err">The error returned from ESENT.</param>
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protected override void GetValueFromBytes(byte[] value, int startIndex, int count, int err)
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{
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if (JET_wrn.ColumnNull == (JET_wrn)err)
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{
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this.Value = null;
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}
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else
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{
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this.CheckDataCount(count);
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this.Value = BitConverter.ToInt16(value, startIndex);
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}
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}
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}
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} |