上記の質問にあるように、クエリに IF 句があります。ここで、IF 句の結果に基づいて UPDATE を実行したいと考えています。どうすればこれを行うことができますか?
これが私のコードです:
string cmdstr = "UPDATE itemsordered i " +
"INNER JOIN" +
"( SELECT itemsOrdered_quantity, itemsOrdered_ID, " +
"CASE WHEN itemsOrdered_quantity = '" + quantityTxtBox.Text + "' THEN 'EQUAL' " +
"WHEN itemsOrdered_quantity < '" + quantityTxtBox.Text + "' THEN 'LESS' " +
"WHEN itemsOrdered_quantity > '" + quantityTxtBox.Text + "' THEN 'MORE' " +
"END AS r " +
"FROM itemsordered " +
") res ON i.itemsOrdered_ID = res.itemsOrdered_ID " +
"INNER JOIN stocksdb s ON s.stock_ID = i.stock_ID " +
"IF (res.r = 'EQUAL') " +
"BEGIN " +
"SET s.stock_quantity = (s.stock_quantity + i.itemsOrdered_quantity), " +
"s.stock_dateUpdated = '" + DateTime.Now.ToString("yyyy-MM-dd hh:mm:ss") + "', " +
"i.itemsOrdered_status = 'RECEIVED', " +
"i.itemsOrdered_dateReceived = '" + DateTime.Now.ToString("yyyy-MM-dd hh:mm:ss") + "' " +
"WHERE i.itemsOrdered_ID = '" + idTxtBox.Text + "' " +
"END " +
"IF (res.r = 'LESS') " +
"BEGIN " +
"SET s.stock_quantity = (s.stock_quantity + i.itemsOrdered_quantity), " +
"s.stock_dateUpdated = '" + DateTime.Now.ToString("yyyy-MM-dd hh:mm:ss") + "', " +
"i.itemsOrdered_quantity = (i.itemsOrdered_quantity - " + quantityTxtBox.Text + "), " +
"i.itemsOrdered_dateReceived = '" + DateTime.Now.ToString("yyyy-MM-dd hh:mm:ss") + "' " +
"WHERE i.itemsOrdered_ID = '" + idTxtBox.Text + "' " +
"END";
cmd = new MySqlCommand(cmdstr, db.mycon);
cmd.ExecuteNonQuery();
MessageBox.Show("ITEM RESTOCKED!");
でエラーが返され、最初の句cmd.ExecuteNonQuery()
の近くにエラーがあると表示されます。IF