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using System;
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using System.Data;
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using System.Configuration;
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using System.Web;
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using System.Web.Security;
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using System.Collections;
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using System.Data.SqlClient;
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/// <summary>
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/// 数据库的通用访问代码
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/// 此类为抽象类，不允许实例化，在应用时直接调用即可
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/// </summary>
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public abstract class SqlHelper
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{
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