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unit Test3;
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{$IFDEF MSWINDOWS}
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{$DEFINE WINDOWS}
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{$ENDIF}
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{$IFDEF FPC}
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{$mode delphi}
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{$codepage utf8}
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{$ENDIF}
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{ Test 3: ad hoc queries}
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{ This test opens the employee example databases with the supplied user name/password
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and runs several queries:
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1. The convenience function OpenCursorAtStart is used to return a count of the
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records in the employee database. This creates its own read only transaction.
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2. A parameterised query is used to delete a record. The record count is repeated
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using the same transaction as the deletion. The transaction is rolled back.
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3. Rollback is demonstrated by returning a record count. This time creating the
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transaction in place.
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4. The above two steps are repeated but with a named parameter ad an implicit end to the transaction.
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5. Note implicit disconnect on end
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}
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interface
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uses
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Classes, SysUtils, TestManager, IB;
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type
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{ TTest3 }
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TTest3 = class(TTestBase)
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private
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procedure DoQuery(Attachment: IAttachment);
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public
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function TestTitle: AnsiString; override;
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procedure RunTest(CharSet: AnsiString; SQLDialect: integer); override;
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end;
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implementation
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{ TTest3 }
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procedure TTest3.DoQuery(Attachment: IAttachment);
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var Transaction: ITransaction;
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ResultSet: IResultSet;
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Statement: IStatement;
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TPB: ITPB;
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us: UnicodeString;
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begin
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writeln(OutFile,'Employee Count = ',Attachment.OpenCursorAtStart('Select count(*) from EMPLOYEE')[0].AsInteger);
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TPB := FirebirdAPI.AllocateTPB;
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TPB.Add(isc_tpb_write);
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TPB.Add(isc_tpb_nowait);
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TPB.Add(isc_tpb_concurrency);
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TPB.Add(isc_tpb_lock_read).AsString := 'EMPLOYEE';
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TPB.Add(isc_tpb_protected);
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Transaction := Attachment.StartTransaction(TPB,taRollback);
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Attachment.ExecuteSQL(Transaction, 'Execute Procedure DELETE_EMPLOYEE ?', [8]);
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ResultSet := Attachment.OpenCursorAtStart(
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Transaction,
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'Select count(*) from EMPLOYEE',3);
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writeln(OutFile,'Employee Count = ',ResultSet[0].AsInteger);
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ResultSet := Attachment.OpenCursorAtStart('Select count(*) from EMPLOYEE');
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writeln(OutFile,'Employee Count = ',ResultSet[0].AsInteger);
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{$IFNDEF FPC}
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Transaction.Rollback; {Delphi does not dispose of interfaces until the end of the function
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so we need to explicitly rollback here. FPC will dispose of the
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interface as soon as it is overwritten - hence this is not needed.}
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{$ENDIF}
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Transaction := Attachment.StartTransaction([isc_tpb_write,isc_tpb_nowait,isc_tpb_concurrency],taRollback);
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Statement := Attachment.PrepareWithNamedParameters(Transaction,'Execute Procedure DELETE_EMPLOYEE :EMP_NO',3);
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Statement.GetSQLParams.ByName('EMP_NO').AsInteger := 8;
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Statement.Execute;
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ResultSet := Attachment.OpenCursorAtStart(
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Transaction,
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'Select count(*) from EMPLOYEE',3);
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writeln(OutFile,'Employee Count = ',ResultSet[0].AsInteger);
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Transaction := nil; {implicit rollback}
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writeln(OutFile,'Employee Count = ',Attachment.OpenCursorAtStart(
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Attachment.StartTransaction([isc_tpb_read,isc_tpb_nowait,isc_tpb_concurrency],taCommit),
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'Select count(*) As Counter from EMPLOYEE',3)[0].AsInteger);
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writeln(OutFile,'Constrained Employee Count = ',Attachment.OpenCursorAtStart(
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Attachment.StartTransaction([isc_tpb_read,isc_tpb_nowait,isc_tpb_concurrency],taCommit),
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'Select count(*) As Counter from EMPLOYEE Where EMP_NO < ?',3,[8])[0].AsInteger);
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writeln(OutFile,'"Johnson" Employee Count = ',Attachment.OpenCursorAtStart(
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Attachment.StartTransaction([isc_tpb_read,isc_tpb_nowait,isc_tpb_concurrency],taCommit),
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'Select count(*) As Counter from EMPLOYEE Where LAST_NAME = ?',3,['Johnson'])[0].AsInteger);
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us := UTF8Decode('Yanowski'); {Test a UnicodeString as a parameter}
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writeln(OutFile,'"Yanowski" Employee Count = ',Attachment.OpenCursorAtStart(
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Attachment.StartTransaction([isc_tpb_read,isc_tpb_nowait,isc_tpb_concurrency],taCommit),
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'Select count(*) As Counter from EMPLOYEE Where LAST_NAME = ?',3,[us])[0].AsInteger);
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end;
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function TTest3.TestTitle: AnsiString;
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begin
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Result := 'Test 3: ad hoc queries';
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end;
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procedure TTest3.RunTest(CharSet: AnsiString; SQLDialect: integer);
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var Attachment: IAttachment;
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DPB: IDPB;
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begin
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DPB := FirebirdAPI.AllocateDPB;
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DPB.Add(isc_dpb_user_name).AsString := Owner.GetUserName;
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DPB.Add(isc_dpb_password).AsString := Owner.GetPassword;
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DPB.Add(isc_dpb_lc_ctype).AsString := CharSet;
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DPB.Add(isc_dpb_set_db_SQL_dialect).AsByte := SQLDialect;
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writeln(OutFile,'Opening ',Owner.GetEmployeeDatabaseName);
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Attachment := FirebirdAPI.OpenDatabase(Owner.GetEmployeeDatabaseName,DPB);
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writeln(OutFile,'Database Open');
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DoQuery(Attachment);
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end;
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initialization
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RegisterTest(TTest3);
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end.
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