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unit Test3; |
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|
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{$mode objfpc}{$H+} |
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{$codepage utf8} |
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|
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{ Test 3: ad hoc queries} |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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5. Note implicit disconnect on end |
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} |
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|
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interface |
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|
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uses |
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Classes, SysUtils, TestManager, IB; |
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|
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type |
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{ TTest3 } |
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|
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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: string; override; |
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procedure RunTest(CharSet: string; SQLDialect: integer); override; |
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end; |
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|
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|
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implementation |
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|
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{ TTest3 } |
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|
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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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begin |
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writeln(OutFile,'Employee Count = ',Attachment.OpenCursorAtStart('Select count(*) from EMPLOYEE')[0].AsInteger); |
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|
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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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|
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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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|
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writeln(OutFile,'Employee Count = ',ResultSet[0].AsInteger); |
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|
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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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|
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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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|
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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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|
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writeln(OutFile,'Employee Count = ',ResultSet[0].AsInteger); |
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|
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Transaction := nil; {implicit rollback} |
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|
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|
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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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|
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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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|
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end; |
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|
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function TTest3.TestTitle: string; |
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begin |
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Result := 'Test 3: ad hoc queries'; |
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end; |
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|
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procedure TTest3.RunTest(CharSet: string; 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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|
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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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|
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initialization |
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RegisterTest(TTest3); |
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|
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end. |
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