ADO.NET Provider for JSON

Build 20.0.7593

DELETE ステートメント

テーブルから情報を削除するには、DELETE ステートメントを使用します。

DELETE 構文

DELETE ステートメントには、次の例に示すように、FROM 句のテーブル名とWHERE 句の行の主キーが必要です。

<delete_statement> ::= DELETE FROM <table_name> WHERE { Id = <expression> } [ { AND | OR } ... ]

<expression> ::=
  | @ <parameter> 
  | ?
  | <literal>

次の例に示すように、ExecuteNonQuery メソッドを使って、データ操作コマンドを実行し影響を受ける行数を取得できます。

C#

String connectionString = "DataModel=Relational;URI=C:\people.json";
using (JSONConnection connection = new JSONConnection(connectionString)) {
  int rowsAffected;
  JSONCommand cmd = new JSONCommand("DELETE FROM NorthwindOData WHERE Id = @myId", connection);
  cmd.Parameters.Add(new JSONParameter("myId","1"));
  rowsAffected = cmd.ExecuteNonQuery();
}

VB.NET

  
Dim connectionString As [String] = "DataModel=Relational;URI=C:\people.json"
Using connection As New JSONConnection(connectionString)
  Dim rowsAffected As Integer
  Dim cmd As New JSONCommand("DELETE FROM NorthwindOData WHERE Id = @myId", connection)
  cmd.Parameters.Add(New JSONParameter("myId", "1"))
  rowsAffected = cmd.ExecuteNonQuery()
End Using

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Build 20.0.7593