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#region 从web.confng中读取数据库连接字符串
/// <summary>
/// 从web.confng中读取数据库连接字符串
/// </summary>
private static readonly string ConnectionString = ConfigurationManager.AppSettings["ConnectionString"];
#endregion
interface IDatabase
{
int ExecuteNonQuery();
DataReader ExecuteReader();
object ExecuteScalar();
DbCommand CreateCommand();
DbParameter CreateParameter();
}