vb.net - Mysql query returning null value and 0 results -

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i have issue driving me crazy!

    query = "select formula  filterprice idcode='" & txtcodigo.text & "' , (filterdata<='" & cant & "')" dim selectcommand new mysqlcommand(query, conexion.conn)          priceselected = conversions.tostring(selectcommand.executescalar())         conexion.desconecta()         conexion.conn.dispose()

but return nothing, hint?

this detailed example data retrieval using parameterised queries :

dim con new mysqlconnection("data source=<server name>;initial catalog=<db name>; integrated security=true;") dim cmdselectdata new mysqlcommand("select formula  filterprice idcode=@idcode , filterdata<=@cant", con) cmdselectdata.parameters.addwithvalue("@idcode", txtcodigo.text) cmdselectdata.parameters.addwithvalue("@cant", cant) if not con.state=connectionstate.open con.open() priceselected=cmdselectdata.executescalar() con.close()

this more secure way databases. hope helps.


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