welcome to XRM blog

Keep in touch with latest CRM/ERP articles

To remain competitive your organisation must be efficient across the business process spectrum. To do so you need to take sound decisions based on a balance between the cost and risk. To do so you will be heavily dependent on your content management in itself needs...

image
Blog

Data Relation using Data Set in .Net

By xrmlabs webmaster on 10/25/2012
DataSet:
 
The DataSet class represents a memory-resident database. It is a container for the DataTable and DataRelation classes.DataRelationIt is a Class to establish relation with more than one data in the dataset.
 
DataRelation class constructor takes three arguments to establish relationship with other table.
 1. Strdatarelationname(String type).
 2. Parent table columan name.
 3. Child table columan name.
 
To get all data againsed parent table column name you have to use GetChildRows method, which takes one
 arguments( Strdatarelationname). and after getting all fields value of child table you can go further with your own code whatever you want.
 
Here below code gives you example to relate two table using particular field of table.
 
DataSet ds = null;
 protected void Page_Load(object sender, EventArgs e)
 {
 ds = new DataSet();
 ds.Tables.Add(MakeAuthorData());
 ds.Tables.Add(MakeBookData());
 
DataRelation relation = new DataRelation("Book2Author", ds.Tables["Authors"].Columns["AuthorId"], ds.Tables["Books"].Columns["AuthorId"]);
 ds.Relations.Add(relation);
 
grdAuthors.DataSource = ds.Tables["Authors"].DefaultView;
 grdAuthors.DataBind();
 
grdBooks.DataSource = ds.Tables["Books"].DefaultView;
 grdBooks.DataBind();
 
foreach (DataRow artistRow in ds.Tables["Authors"].Rows)
 {
 string fname = (string)artistRow["FirstName"];
 string lname = (string)artistRow["LastName"];
 labReport.Text += "" + fname + " " + lname;
 foreach (DataRow bookRow in artistRow.GetChildRows(relation)) //Get child table fields
 {
 string title = (string)bookRow["Title"];
 labReport.Text += "" + title;
 
}
 }
 }
 private DataTable MakeAuthorData()
 {
 DataTable table = new DataTable();
 table.TableName = "Authors";
 
DataColumn idCol = new DataColumn();
 idCol.ColumnName = "AuthorId";
 idCol.DataType = typeof(Int32);
 idCol.AllowDBNull = false; idCol.Unique = true;
 
DataColumn firstNameCol = new DataColumn("FirstName", typeof(string));
 DataColumn lastNameCol = new DataColumn("LastName", typeof(string));
 
table.Columns.Add(idCol);
 table.Columns.Add(firstNameCol);
 table.Columns.Add(lastNameCol);
 
DataRow r1 = table.NewRow();
 r1[0] = 10;
 r1[1] = "A";
 r1[2] = "a";
 table.Rows.Add(r1);
 
DataRow r2 = table.NewRow();
 r2[0] = 20;
 r2["FirstName"] = "B";
 r2["LastName"] = "b";
 table.Rows.Add(r2);
 
DataRow r3 = table.NewRow();
 r3[0] = 30; r3["FirstName"] = "C";
 r3["LastName"] = "c";
 table.Rows.Add(r3);
 
DataRow r4 = table.NewRow();
 r4[0] = 40; r4["FirstName"] = "D";
 r4["LastName"] = "d";
 table.Rows.Add(r4);
 return table;
 }
 
private DataTable MakeBookData()
 {
 DataTable table = new DataTable();
 table.TableName = "Books";
 
DataColumn idCol = new DataColumn();
 idCol.ColumnName = "Id";
 idCol.DataType = typeof(Int32);
 idCol.AllowDBNull = false;
 idCol.Unique = true;
 idCol.AutoIncrement = true;
 
DataColumn authorCol = new DataColumn("AuthorId", typeof(Int32));
 DataColumn nameCol = new DataColumn("Title", typeof(string));
 DataColumn priceCol = new DataColumn("Price", typeof(double));
 
table.Columns.Add(idCol);
 table.Columns.Add(authorCol);
 table.Columns.Add(nameCol);
 table.Columns.Add(priceCol);
 DataRow r1 = table.NewRow();
 r1[1] = 30;
 r1[2] = "Java";
 r1[3] = 49.99;
 table.Rows.Add(r1);
 
DataRow r2 = table.NewRow();
 r2[1] = 10;
 r2[2] = "C#";
 r2[3] = 19.99;
 table.Rows.Add(r2);
 
DataRow r3 = table.NewRow();
 r3[1] = 40; r3[2] = "Javascript";
 r3[3] = 24.99;
 table.Rows.Add(r3);
 
DataRow r4 = table.NewRow();
 r4[1] = 40; r4[2] = "Oracle";
 r4[3] = 24.99;
 table.Rows.Add(r4);
 return table;
 }
 }
 
Happy Coding.
Blog Calendar
Blog Calendar List
2024 Apr  18  4
2024 Mar  33  4
2024 Feb  28  3
2024 Jan  8  7
2023 Dec  14  6
2023 Nov  45  5
2023 Oct  118  12
2023 Sep  245  9
2023 Aug  63  7
2023 Jul  31  5
2023 Jun  20  4
2023 May  43  5
2023 Apr  35  5
2023 Mar  98  6
2023 Feb  111  5
2023 Jan  40  4
2022 Dec  94  7
2022 Nov  254  2
2022 Sep  13  1
2022 Aug  28  2
2022 Jun  7  2
2022 May  4  2
2022 Apr  6  2
2022 Mar  2  1
2022 Feb  2  1
2022 Jan  1  1
2021 Dec  4  1
2021 Nov  2  1
2021 Oct  2  1
2021 Sep  12  1
2021 Aug  38  5
2021 Jul  36  4
2021 Jun  1244  5
2021 May  31  3
2021 Apr  2036  3
2021 Mar  189  5
2021 Feb  2142  7
2021 Jan  3106  9
2020 Dec  446  7
2020 Sep  74  3
2020 Aug  685  3
2020 Jul  128  1
2020 Jun  75  3
2020 Apr  69  3
2020 Mar  13  2
2020 Feb  28  5
2020 Jan  34  7
2019 Dec  17  4
2019 Nov  30  1
2019 Jan  23  2
2018 Dec  69  4
2018 Nov  68  3
2018 Oct  18  3
2018 Sep  1152  11
2018 Aug  7  2
2018 Jun  14  1
2018 Jan  68  2
2017 Sep  585  5
2017 Aug  17  1
2017 Jul  17  2
2017 Jun  62  2
2017 May  21  1
2017 Apr  35  2
2017 Mar  135  4
2017 Feb  784  4
2016 Dec  204  3
2016 Nov  833  8
2016 Oct  307  10
2016 Sep  704  6
2016 Aug  39  1
2016 Jun  1876  6
2016 May  110  3
2016 Jan  71  2
2015 Dec  484  6
2015 Nov  4  1
2015 Oct  13  1
2015 Sep  1464  6
2015 Aug  14  1
2015 Jul  128  2
2015 Jun  11  1
2015 May  20  1
2015 Apr  30  3
2015 Mar  80  3
2015 Jan  5335  4
2014 Dec  17  1
2014 Nov  2257  4
2014 Oct  68  1
2014 Sep  107  2
2014 Aug  5280  1
2014 Jul  49  2
2014 Apr  2578  12
2014 Mar  301  17
2014 Feb  220  6
2014 Jan  1510  16
2013 Dec  21  2
2013 Nov  690  2
2013 Oct  256  3
2013 Sep  11  1
2013 Aug  40  3
2013 Jul  214  1
2013 Apr  57  6
2013 Mar  2292  10
2013 Feb  127  3
2013 Jan  343  2
2012 Nov  57  2
2012 Oct  499  10
Tag Cloud
Interested in our services? Still not sure about project details? get a quote