DataConnector | ComponentOne
ADO.NET provider for Kintone / Querying Data
In This Topic
    Querying Data
    In This Topic

    The ADO.NET Provider for Kintone implements two classes you can use to perform CRUD (Create, Read, Update, and Delete) operations: DbDataReader and C1KintoneDataAdapter classes. The tabs below describe the interfaces and code implementations.

    Querying With DbDataReader

    The DbDataReader class can be used to fetch data in subset increments as required. It can retrieve data quicker than the C1KintoneDataAdapter as it retrieves data in pages. When you read data from the DbDataReader, it requests the succeeding page from the data source to load the result, which makes the data retrieval faster.

    The following code examples demonstrate create, read, update, and delete operations from the data source using the DbDataReader.

     

    Create Data

    The example adds new records by executing the Insert command.

    C#
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    static void InsertDataReader()
{
    string kintoneConnection = string.Format("Username={0};Password={1};Url={2}", Username, Password, Url);

    using (C1KintoneConnection conn = new C1KintoneConnection(kintoneConnection))
    {
        conn.Open();
        //Create Insert command
        C1KintoneCommand command = new C1KintoneCommand(conn, $"INSERT INTO Products(ProductName) VALUES('Lorem Ipsum')");
        //Execute Insert command
        int i = command.ExecuteNonQuery();
        if (i != -1)
        {
            Console.WriteLine("Insert operation successful !!! \n \n");
        }
    }
}

    Read Data

    This example retrieves data by executing the Select command.

    C#
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    static void ReadDataReader()
{
    string kintoneConnection = string.Format("Username={0};Password={1};Url={2}", Username, Password, Url);

    using (C1KintoneConnection con = new C1KintoneConnection(kintoneConnection))
    {
        con.Open();
        //Create Read command
        var cmd = con.CreateCommand();
        cmd.CommandText = "SELECT  *  FROM Products";
        //Execute Read command and display fetched data
        DbDataReader rdr = cmd.ExecuteReader();
        while (rdr.Read())
        {
            Console.WriteLine(String.Format("\t{0} --> \t\t{1}", rdr["Updated By"], rdr["ProductName"]));
        }
        Console.WriteLine("Read operation successful !!! \n \n");
    }
}

    Update Data

    This example modifies data by executing the Update command.

    C#
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    static void UpdateDataReader()
{
    string kintoneConnection = string.Format("Username={0};Password={1};Url={2}", Username, Password, Url);

    using (C1KintoneConnection conn = new C1KintoneConnection(kintoneConnection))
    {
        conn.Open();
        //Create Update command
        C1KintoneCommand command = new C1KintoneCommand(conn, "UPDATE Products SET [ProductName]='Lorem Ipsum updated' WHERE ProductName = 'Lorem Ipsum'");

        //Execute Update command
        int i = command.ExecuteNonQuery();
        if (i != -1)
        {
            Console.WriteLine("Update operation successful !!! \n \n");
        }
    }
}

    Delete Data

    This example removes data by executing the Delete command.

    C#
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    static void DeleteDataReader()
{
    string kintoneConnection = string.Format("Username={0};Password={1};Url={2}", Username, Password, Url);

    using (C1KintoneConnection conn = new C1KintoneConnection(kintoneConnection))
    {
        conn.Open();
        //Create Delete command
        C1KintoneCommand command = new C1KintoneCommand(conn, "DELETE FROM Products WHERE ProductName = 'Lorem Ipsum updated'");

        //Execute Delete command
        int i = command.ExecuteNonQuery();
        if (i != -1)
        {
            Console.WriteLine("Delete operation successful !!! \n \n");
        }
    }
}

    Querying With C1KintoneDataAdapter

    The C1KintoneDataAdapter class can be used to retrieve a single result set containing all the data that matches a given query. The C1KintoneDataAdapter uses its Fill method to fetch data from the data source. An empty DataTable instance is passed as an argument to the Fill method. Once the method returns, the DataTable instance is populated with the queried data. Since the Fill method must retrieve all the data from the data source before returning, the C1KintoneDataAdapter is slower compared to the DbDataReader.

    The following code examples demonstrate create, read, update, and delete operations from the data source using the C1KintoneDataAdapter.

     

    Create Data

    The example adds new records by executing the Insert command.

    C#
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    static void InsertDataAdapter()
{
    string kintoneConnection = string.Format("Username={0};Password={1};Url={2}", Username, Password, Url);

    using (C1KintoneConnection conn = new C1KintoneConnection(kintoneConnection))
    {
        //Populate DataTable
        C1KintoneDataAdapter adapter = new C1KintoneDataAdapter(conn, "SELECT * FROM Products");
        DataTable dataTable = new DataTable();
        adapter.Fill(dataTable);

        //Create Insert command
        adapter.InsertCommand = new C1KintoneCommand(conn);
        adapter.InsertCommand.CommandText = "INSERT INTO Products(ProductName, UnitPrice) VALUES(@ProductName, @UnitPrice)";
        adapter.InsertCommand.Parameters.Add("@UnitPrice", "UnitPrice");
        adapter.InsertCommand.Parameters.Add("@ProductName", "ProductName");
        adapter.InsertCommand.UpdatedRowSource = UpdateRowSource.None;
        //Insert new row
        DataRow productRow = dataTable.NewRow();
        productRow["UnitPrice"] = 100;
        productRow["ProductName"] = "Lorem Ipsum";
        dataTable.Rows.Add(productRow);

        //Update database
        var i = adapter.Update(dataTable);

        if (i != -1)
        {
            Console.WriteLine("Insert operation successful !!! \n \n");
        }
    }
}

    Read Data

    This examples retrieves data by executing the Select command.

    C#
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    static void ReadDataAdapter()
{
    string kintoneConnection = string.Format("Username={0};Password={1};Url={2}", Username, Password, Url);

    using (C1KintoneConnection conn = new C1KintoneConnection(kintoneConnection))
    {
        //Populate DataTable                
        C1KintoneDataAdapter adapter = new C1KintoneDataAdapter(conn, "SELECT * FROM Products");
        DataTable dataTable = new DataTable();
        var i = adapter.Fill(dataTable);
        if (i != -1)
        {
            Console.WriteLine("Read operation successful !!! \n \n");
            //Display fetched data
            foreach (DataRow row in dataTable.Rows)
            {
                Console.WriteLine("{0}\t{1}", row["Updated By"], row["ProductName"]);
            }
        }
    }
}

    Update Data

    This example modifies data by executing the Update command.

    C#
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    static void UpdateDataAdapter()
{
    string kintoneConnection = string.Format("Username={0};Password={1};Url={2}", Username, Password, Url);

    using (C1KintoneConnection conn = new C1KintoneConnection(kintoneConnection))
    {
        //Populate DataTable
        C1KintoneDataAdapter adapter = new C1KintoneDataAdapter(conn, "SELECT * FROM Products");
        DataTable dataTable = new DataTable();
        adapter.Fill(dataTable);
        //Create Update command
        adapter.UpdateCommand = new C1KintoneCommand(conn);
        adapter.UpdateCommand.CommandText = "UPDATE Products SET UnitPrice = @UnitPrice WHERE ProductName = @ProductName";
        adapter.UpdateCommand.Parameters.Add("@UnitPrice", "UnitPrice");
        adapter.UpdateCommand.Parameters.Add("@ProductName", "ProductName");
        adapter.UpdateCommand.UpdatedRowSource = UpdateRowSource.None;

        //Update existing row
        DataRow productRow = dataTable.Rows[0];
        productRow["UnitPrice"] = 550;
        productRow["ProductName"] = "Lorem Ipsum";

        //Update database
        var i = adapter.Update(dataTable);

        if (i != -1)
        {
            Console.WriteLine("Update operation successful !!! \n \n");
        } 
    }
}

    Delete Data

    This example removes data by executing the Delete command.

    C#
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    static void DeleteDataAdapter()
{
    using (C1KintoneConnection conn = new C1KintoneConnection(kintoneConnection))
    {
        //Populate Datatable
        C1KintoneDataAdapter adapter = new C1KintoneDataAdapter(conn, "Select * from Products");
        DataTable dataTable = new DataTable();
        adapter.Fill(dataTable);
        //Create Delete command
        adapter.DeleteCommand = new C1KintoneCommand(conn);
        adapter.DeleteCommand.CommandText = "Delete from Products where Name = @Name";
        adapter.DeleteCommand.Parameters.Add("@Name", "Name");
        adapter.DeleteCommand.UpdatedRowSource = UpdateRowSource.None;

        //Delete a row
        DataRow bookRow1 = dataTable.Rows[3];
        bookRow1["Name"] = "'Test Incremental Cache by Demen'";
        bookRow1.Delete();
        
        //Update Database
        var i = adapter.Update(dataTable);

        if (i != -1)
        {
            Console.WriteLine("Delete operation successful !!! \n \n");
        }
    }