50 lines
1.5 KiB
C#
50 lines
1.5 KiB
C#
//---------------------------------------------------------------------
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// <copyright file="QueryParameter.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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//
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// @owner [....]
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// @backupOwner [....]
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//---------------------------------------------------------------------
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namespace System.Data.Common.EntitySql.AST
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{
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using System;
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/// <summary>
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/// Represents an ast node for a query parameter.
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/// </summary>
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internal sealed class QueryParameter : Node
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{
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private readonly string _name;
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/// <summary>
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/// Initializes parameter
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/// </summary>
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/// <remarks>
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/// <exception cref="System.Data.EntityException">Thrown if the parameter name does not conform to the expected format</exception>
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/// </remarks>
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internal QueryParameter(string parameterName, string query, int inputPos)
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: base(query, inputPos)
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{
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_name = parameterName.Substring(1);
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//
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// valid parameter format is: @({LETTER})(_|{LETTER}|{DIGIT})*
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//
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if (_name.StartsWith("_", StringComparison.OrdinalIgnoreCase) || Char.IsDigit(_name, 0))
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{
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throw EntityUtil.EntitySqlError(ErrCtx, System.Data.Entity.Strings.InvalidParameterFormat(_name));
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}
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}
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/// <summary>
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/// Returns parameter parameterName (without @ sign).
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/// </summary>
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internal string Name
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{
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get { return _name; }
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}
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}
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}
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