022. ASP.NET为DataSet中数据集添加关系及动态创建主子表和添加主子表关系

    protected void Page_Load(object sender, EventArgs e)
    {
        string connectionString = "server=.;database=TYW;uid=sa;pwd=123.456;";// ConfigurationSettings.AppSettings["strCon"];
        SqlConnection mycon = new SqlConnection(connectionString);//创建数据库连接
        string sqlCategory = "select  * from Category";//查询商品分类表中信息
        string sqlPhoto = "select  * from productinfo";//查询商品表中信息
        SqlDataAdapter da = new SqlDataAdapter(sqlCategory, mycon);//创建数据适配器
        DataSet ds = new DataSet();//创建数据集
        try
        {
            //显式地打开数据库连接
            if (mycon.State.Equals(ConnectionState.Closed))
            {
                mycon.Open();
            }
            da.Fill(ds, "Category");//填充商品分类表
            da.SelectCommand.CommandText = sqlPhoto;
            da.Fill(ds, "productinfo");//填充商品信息表
        }
        finally
        {
            mycon.Close();//显式地关闭数据库连接
        }
        //创建DataRelation对象，关联表间关系, DataRelation表示两个DataTable 对象之间的父/子关系。
        //   relationName:DataRelation 的名称。如果为 null 或空字符串 ("")，则当创建的对象添加到 System.Data.DataRelationCollection
        //     时，将指定一个默认名称。
        //   parentColumn:
        //     关系中的父级对应的列.
        //   childColumn:
        //     关系中的子级对应的列.
        DataRelation relat = new DataRelation("Category", ds.Tables["Category"].Columns["cateID"], ds.Tables["productinfo"].Columns["cateID"]);
        ds.Relations.Add(relat);//添加表间关系
        StringBuilder builder = new StringBuilder("");
        foreach (DataRow row in ds.Tables["Category"].Rows)
        {
            builder.Append("<b>");
            builder.Append(row["cateName"].ToString());
            builder.Append("</b><ul>");
            DataRow[] childRows = row.GetChildRows(relat);
            foreach (DataRow childRow in childRows)
            {
                builder.Append("<li>");
                builder.Append(childRow["productName"].ToString());
                builder.Append("</li>");
            }
            builder.Append("</ul>");
        }
        lbText.Text += builder.ToString();//将运行结果输出到页面中
    }

截图如下:

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" alt="" />

动态添加主子表, 且动态创建主子表的关系:

     protected void Page_Load(object sender, EventArgs e)
     {
         MakeMasterTable();  //创建主表
         MakeDetailTable();  //创建子表
         MakeDataRelation(); //建立主子表关联
     }

     private DataSet ds;

     private void MakeMasterTable()
     {
         //创建数据表对象
         DataTable table = new DataTable("MasterTable");
         DataColumn column;
         DataRow row;
         //创建数据列对象
         column = new DataColumn();
         //设置数据列的数据类型
         column.DataType = System.Type.GetType("System.Int32");
         column.ColumnName = "DictTypeID";//指定数据列名
         column.ReadOnly = true;          //设置数据列为只读列
         column.Unique = true;            //设置数据列中的值不允许重复
         table.Columns.Add(column);

         column = new DataColumn();
         column.DataType = System.Type.GetType("System.String");
         column.ColumnName = "DictTypeName";
         column.AutoIncrement = false;    //设置数据列中的值不自动递增
         column.Caption = "DictTypeName"; //设置数据列标题
         column.ReadOnly = false;
         column.Unique = false;
         table.Columns.Add(column);
         //创建列数组
         DataColumn[] PrimaryKeyColumns = new DataColumn[];
         //将DictTypeID赋给列数组
         PrimaryKeyColumns[] = table.Columns["DictTypeID"];
         table.PrimaryKey = PrimaryKeyColumns;//设置DictTypeID字段为主键

         ds = new DataSet();//创建数据集对象
         ds.Tables.Add(table);//将上面创建的数据表对象添加表数据集中
         //为数据表添加数据
         for (int i = ; i< ; i++)
         {
             row = table.NewRow();
             row["DictTypeID"] = i;
             row["DictTypeName"] = "DictTypeName " + i;
             table.Rows.Add(row);
         }
         GridView1.DataSource = ds;
         GridView1.DataBind();
     }

     private void MakeDetailTable()
     {
         DataTable table = new DataTable("DetailTable");
         DataColumn column;
         DataRow row;

         column = new DataColumn();
         column.DataType= System.Type.GetType("System.Int32");
         column.ColumnName = "DictItemID";
         column.AutoIncrement = true;//设置该数据列是自增列
         column.Caption = "DictItemID";
         column.ReadOnly = true;
         column.Unique = true;

         table.Columns.Add(column);

         column = new DataColumn();
         column.DataType= System.Type.GetType("System.String");
         column.ColumnName = "DictItemName";
         column.AutoIncrement = false;
         column.Caption = "DictItemName";
         column.ReadOnly = false;
         column.Unique = false;
         table.Columns.Add(column);

         column = new DataColumn();
         column.DataType= System.Type.GetType("System.Int32");
         column.ColumnName = "DictTypeID";
         column.AutoIncrement = false;
         column.Caption = "DictTypeID";
         column.ReadOnly = false;
         column.Unique = false;
         table.Columns.Add(column);

         ds.Tables.Add(table);

         for(int i = ; i <= ; i ++)
         {
             row = table.NewRow();
             //row["DictItemID"] = i;//因为该列是自增列所以不用赋值
             row["DictItemName"] = "DictItemName " + i;
             row["DictTypeID"] = ;
             table.Rows.Add(row);
         }
         for(int i = ; i <= ; i ++)
         {
             row = table.NewRow();
             //row["DictItemID"] = i + 5;
             row["DictItemName"] = "DictItemName " + (i+);
             row["DictTypeID"] = ;
             table.Rows.Add(row);
         }
     }

     private void MakeDataRelation()
     {
         DataColumn masterColumn =
             ds.Tables["MasterTable"].Columns["DictTypeID"];
         DataColumn detailColumn =
             ds.Tables["DetailTable"].Columns["DictTypeID"];
         //使用DataRelation对象建立主子表的关联关系
         DataRelation relation = new
             DataRelation("MasterDetail", masterColumn, detailColumn);
         ds.Tables["DetailTable"].ParentRelations.Add(relation);
     }