Wie mache ich MySQL-Code kürzer?

Question

Ich versuche, einen Datumsfilter für meinen Bericht zu erstellen Formular generieren. Ich habe ein DateTimePicker mit Checkbox in diesem Formular, Wenn Checkbox überprüft, fügt die Abfrage eine WHERE-Klausel hinzu.

Derzeit Im tun auf diese Weise: -

  If DateTimePicker1.Checked Then 
       query = "SELECT payment_type, sales_payment_dtl.payment_amt, payment_remark, sales_payment_dtl.created_date, sales.inv_no 
        FROM sales_payment_dtl 
        INNER JOIN sales_payment 
        ON sales_payment_dtl.payment_id = sales_payment.payment_id 
        INNER JOIN sales 
        ON sales_payment.sales_id = sales.sales_id 
        WHERE sales_payment_dtl.created_date = '"& DateTimePicker.Text &"'" 
     Else 
       query = "SELECT payment_type, sales_payment_dtl.payment_amt, payment_remark, sales_payment_dtl.created_date, sales.inv_no 
        FROM sales_payment_dtl 
        INNER JOIN sales_payment 
        ON sales_payment_dtl.payment_id = sales_payment.payment_id 
        INNER JOIN sales 
        ON sales_payment.sales_id = sales.sales_id" 
     End If 

Ist es möglich, den Code kürzer zu machen? Da ich in Zukunft noch Filter hinzufügen muss, wird der Code dann sehr lang, vielleicht sowas ähnliches?

query = "SELECT payment_type, sales_payment_dtl.payment_amt, payment_remark, sales_payment_dtl.created_date, sales.inv_no 
        FROM sales_payment_dtl 
        INNER JOIN sales_payment 
        ON sales_payment_dtl.payment_id = sales_payment.payment_id 
        INNER JOIN sales 
        ON sales_payment.sales_id = sales.sales_id 

        IF '"& DateTimePicker.Checked = True &"' THEN 
        WHERE sales_payment_dtl.created_date = '"& DateTimePicker.Text &"' 
        ELSE 
        do nothing" 

Answer 1

Einfache Logik.

query = "SELECT payment_type, sales_payment_dtl.payment_amt, payment_remark, sales_payment_dtl.created_date, sales.inv_no " & _ 
    "FROM(sales_payment_dtl) " & _ 
    "INNER JOIN sales_payment " & _ 
    "ON sales_payment_dtl.payment_id = sales_payment.payment_id " & _ 
    "INNER JOIN sales " & _ 
    "ON sales_payment.sales_id = sales.sales_id" 

    If DateTimePicker1.Checked Then 
     query &= " WHERE sales_payment_dtl.created_date = '" & DateTimePicker.Text & "'" 
    End If