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select A.*,
(SELECT a,  CAST(G_Univalence AS NVARCHAR(48)) AS G_Univalence,
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 from B WHERE B.CB_ID = A.BP_ID FOR XML RAW,TYPE,ROOT('GrainConstraint')) AS GrainConstraint 
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from A
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  public static bool ToDataTable(SqlXml sxSource, DataTable dt)
        {
            XmlReader xmlReader = sxSource.CreateReader();
            string tempName;
            int nColumnIndex;
            Type type;
            while (xmlReader.Read()) //ÿ´ÎÑ­»·1Ìõ¼Ç¼
            {
                switch (xmlReader.NodeType)
                {
                    case XmlNodeType.Element:
                        if (xmlReader.LocalName == "row")
                        {
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