How To Create A Data Gateway On A Microsoft Powerbook On A Pc Or Macode (For Microsoft) On A Macode 2.5 (For A Microode) On An Ipad Or Macroode ( For A Microos

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Dorthy Blake
5 years ago
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1 Table Module com Table Data Gateway usando Result Set

2 Packages UI «table module» BLL «table data gateway» DAL 58

3 Classes BLL Contract + Contract ( ) + RecognizedRevenue ( [in] contractid : int, [in] asof : DateTime ) : Money + CalculateRevenueRecognitions ( [in] contractid : int ) + GetContracts ( ) : DataSet + GetContractsByProduct ( [in] productid : int ) : DataSet + GetContractsByCustomer ( [in] customerid : int ) : DataSet Customer + Customer ( ) + GetCustomers ( ) : DataTable Product + Product ( ) + GetProducts ( ) : DataTable 59

GetContractsByProduct ( [in] productid : int ) : DataSet + GetContractsByCustomer ( [in] customerid : int

4 Classes DAL CustomerGateway + CustomerGateway ( ) + GetCustomers ( ) : DataTable ContractGateway ProductGateway + ProductGateway ( ) + GetProducts ( ) : DataTable + ContractGateway ( ) + InsertRecognition ( [in] contractid : int, [in] recognitiondate : DateTime, [in] amount : decimal ) : int + GetContracts ( ) : DataSet + GetContractByID ( [in] contractid : int ) : DataSet + GetContractsByProduct ( [in] productid : int ) : DataSet + GetContractsByCustomer ( [in] customerid : int ) : DataSet BaseGateway # «property» CurrentTransaction : OleDbTransaction - CONNSTR : string 60 + BaseGateway ( ) # GetConnection ( [in] open : bool ) : OleDbConnection # ExecuteQuery ( [in] cnx : OleDbConnection, [in] sql : string ) : DataSet # ExecuteNonQuery ( [in] cnx : OleDbConnection, [in] sql : string ) : int # ExecuteNonQuery ( [in] tx : OleDbTransaction, [in] sql : string ) : int # ExecuteNonQuery ( [in] tx : OleDbTransaction, [in] cmd : OleDbCommand ) : int + BeginTransaction ( ) + CommitTransaction ( ) + RoolbackTransaction ( ) # «get» CurrentTransaction ( ) : OleDbTransaction

GetContractsByProduct ( [in] productid : int ) : DataSet + GetContractsByCustomer ( [in] customerid : int ) : DataSet BaseGateway # «property» CurrentTransaction : OleDbTransaction - CONNSTR : string

5 Sequência GetContracts / User : Actor1 / GUI / ClassifierRole1 : Contract / ClassifierRole2 : Contract Gateway 1 : \Form_Load\ 2 : GetContracts ( ) 3 : GetContracts ( ) 4 : GetConnection ( open ) 5 : ExecuteQuery ( cnx, sql ) 61

$Gateway 1 : \Form_Load\ 2 : GetContracts ( ) 3 :$

6 Sequência CalculateRevenues / User : Actor1 / GUI / ClassifierRole1 : Contract 1 : \btncalcrevenues_click\ 2 : CalculateRevenueRecognitions ( contractid ) 3 : \new\ / ClassifierRole2 : Contract Gateway 4 : GetContractByID ( contractid ) 5 : BeginTransaction ( ) 6 : InsertRecognition ( contractid, recognitiondate, amount ) foreach calculated recognition 7 : CommitTransaction ( ) 62

ClassifierRole2 : Contract Gateway 4 : GetContractByID ( contractid ) 5 : BeginTransaction ( )

7 CalculateRevenues() public void CalculateRevenueRecognitions(int contractid) { DAL.ContractGateway dal = new DAL.ContractGateway(); DataSet ds = dal.getcontractbyid(contractid); string prodtype = (string)ds.tables[0].rows[0]["type"]; decimal totalrevenue = (decimal)ds.tables[0].rows[0]["revenue"]; DateTime recdate = (DateTime)ds.Tables[0].Rows[0]["dateSigned"]; 63 } dal.begintransaction(); switch (prodtype) { case "PT": dal.insertrecognition(contractid, recognitiondate, totalrevenue); break; case "FC": decimal[] allocs = Money.Allocate(totalRevenue, 3); dal.insertrecognition(contractid, recdate, allocs[0]); dal.insertrecognition(contractid, recdate.adddays(60), allocs[1]); dal.insertrecognition(contractid, recdate.adddays(90), allocs[2]); break; case "BD": decimal[] allocs = Money.Allocate(totalRevenue, 3); dal.insertrecognition(contractid, recdate, allocs[0]); dal.insertrecognition(contractid, recdate.adddays(30), allocs[1]); dal.insertrecognition(contractid, recdate.adddays(60), allocs[2]); break; } dal.committransaction();

Rows[0]["dateSigned"]; 63 } dal.begintransaction(); switch (prodtype) { case "PT": dal.insertrecognition(contractid, recognitiondate, totalrevenue); break; case "FC": decimal[] allocs = Money.

8 CalculateRevenues() public int InsertRecognition(int contractid, DateTime recognitiondate, decimal amount) { OleDbCommand sqlcmd = new OleDbCommand("INSERT INTO TRevenueRecognitions (contractid, daterecognition, amount) VALUES (?,?,?)", CurrentTransation.Connection, CurrentTransation); sqlcmd.parameters.add("@cid", contractid); sqlcmd.parameters.add("@dt", recognitiondate); sqlcmd.parameters.add("@amt", amount); } return ExecuteNonQuery(CurrentTransation, sqlcmd); 64

(?,?,?)", CurrentTransation.Connection, CurrentTransation); sqlcmd.parameters.add("@cid", contractid); sqlcmd.

9 Notas Método ContractGateway.GetContractByID retorna um DataSet resultante do join da tabela TContracts com TProducts Para garantir coerência e consistência das alterações na BD, a classe Gateway tem que guardar estado relativo à transação a usar Controlo de transacções dá uma discussão separada... 65

com TProducts Para garantir coerência e consistência das alterações na BD,

Access Data Object (cont.)

ADO.NET Access Data Object (cont.) What is a Dataset? DataTable DataSet DataTable DataTable SqlDataAdapter SqlConnection OleDbDataAdapter Web server memory Physical storage SQL Server 2000 OleDbConnection