Проверка на NULL
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with qSomeQuery do begin if FieldByName('someField').IsNull then //do something end; |
Запись NULL значений, согласно инструкции
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// setting param to null ... qSomeQuery.SQL.Text:= 'INSERT INTO DATABASE.TABLE (`someParam`) values (:someParam)'; ... //To set the parameter value to Null, specify the parameter data type, then call the Clear method: with qSomeQuery do begin with ParamByName('someParam') do begin DataType:=ftInteger; Clear(); Bound:=true; end; ExecSQL; end; |
Пример из проекта…
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SET foreign_key_checks = 0; UPDATE `galionsms_db`.`clients` SET `partners_id`=:partners_id WHERE `id`=:id; SET foreign_key_checks = 1; |
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with qUpdatePartners_idInClients do begin Connection:=DBConnection.FDConnection; with ParamByName('partners_id') do begin DataType:=ftInteger; Clear(); Bound:=true; end; Params.ParamValues['id']:=ClientsOfPartner[i]; ExecSQL; end; |