KeyFields Property (BigQueryCommandBuilder)

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Gets or sets string containing list of key field names separated by semicolon. They are used to generate update commands.

Syntax

Visual Basic
C#


'Declaration Public Shadows Property KeyFields As String


public new string KeyFields {get; set;}

Property Value

The string containing list of key field names separated by semicolon.

Remarks

This property is used when the ConflictOption property is set to OverwriteChanges, otherwise all columns will be used in the WHERE clause.

If KeyFields is nonempty, its value is used as the list of columns for the WHERE clause. If KeyFields is empty, the primary key columns are used.

Example

The following example demonstrates how UPDATE and DELETE statements are generated.

csharp


public void UseKeyFields(string connectionString) { BigQueryConnection conn = new BigQueryConnection(connectionString); conn.Open(); BigQueryDataAdapter adapter = new BigQueryDataAdapter("SELECT * FROM your_project.your_dataset.employees", conn); BigQueryCommandBuilder commBuilder = new BigQueryCommandBuilder(adapter); commBuilder.ConflictOption = ConflictOption.OverwriteChanges; commBuilder.KeyFields = "id, first_name"; string updateComm = commBuilder.GetUpdateCommand().CommandText; string deleteComm = commBuilder.GetDeleteCommand().CommandText; Console.WriteLine(updateComm); Console.WriteLine(deleteComm); conn.Close(); }

public void UseKeyFields(string connectionString) {

        BigQueryConnection conn = new BigQueryConnection(connectionString);
        conn.Open();

        BigQueryDataAdapter adapter = new BigQueryDataAdapter("SELECT * FROM your_project.your_dataset.employees", conn);
        BigQueryCommandBuilder commBuilder = new BigQueryCommandBuilder(adapter);

        commBuilder.ConflictOption = ConflictOption.OverwriteChanges;

        commBuilder.KeyFields = "id, first_name";

        string updateComm = commBuilder.GetUpdateCommand().CommandText;
        string deleteComm = commBuilder.GetDeleteCommand().CommandText;

        Console.WriteLine(updateComm);
        Console.WriteLine(deleteComm);
        conn.Close();
}

Visual Basic


Public Sub UseKeyFields(ByVal connectionString As String) Dim conn As BigQueryConnection = New BigQueryConnection(connectionString) conn.Open() Dim adapter As BigQueryDataAdapter = New BigQueryDataAdapter("SELECT * FROM your_project.your_dataset.employees", conn) Dim commBuilder As BigQueryCommandBuilder = New BigQueryCommandBuilder(adapter) commBuilder.ConflictOption = ConflictOption.OverwriteChanges commBuilder.KeyFields = "id, first_name" Dim updateComm As String = commBuilder.GetUpdateCommand().CommandText Dim deleteComm As String = commBuilder.GetDeleteCommand().CommandText Console.WriteLine(updateComm) Console.WriteLine(deleteComm) conn.Close() End Sub

Public Sub UseKeyFields(ByVal connectionString As String)
        Dim conn As BigQueryConnection = New BigQueryConnection(connectionString)
        conn.Open()

        Dim adapter As BigQueryDataAdapter = New BigQueryDataAdapter("SELECT * FROM your_project.your_dataset.employees", conn)
        Dim commBuilder As BigQueryCommandBuilder = New BigQueryCommandBuilder(adapter)

        commBuilder.ConflictOption = ConflictOption.OverwriteChanges

        commBuilder.KeyFields = "id, first_name"

        Dim updateComm As String = commBuilder.GetUpdateCommand().CommandText
        Dim deleteComm As String = commBuilder.GetDeleteCommand().CommandText

        Console.WriteLine(updateComm)
        Console.WriteLine(deleteComm)
        conn.Close()
End Sub

Reference

BigQueryCommandBuilder Class
BigQueryCommandBuilder Members

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