| 1 |
unit Test3; |
| 2 |
{$IFDEF MSWINDOWS} |
| 3 |
{$DEFINE WINDOWS} |
| 4 |
{$ENDIF} |
| 5 |
|
| 6 |
{$IFDEF FPC} |
| 7 |
{$mode delphi} |
| 8 |
{$codepage utf8} |
| 9 |
{$ENDIF} |
| 10 |
|
| 11 |
{ Test 3: ad hoc queries} |
| 12 |
|
| 13 |
{ This test opens the employee example databases with the supplied user name/password |
| 14 |
and runs several queries: |
| 15 |
|
| 16 |
1. The convenience function OpenCursorAtStart is used to return a count of the |
| 17 |
records in the employee database. This creates its own read only transaction. |
| 18 |
|
| 19 |
2. A parameterised query is used to delete a record. The record count is repeated |
| 20 |
using the same transaction as the deletion. The transaction is rolled back. |
| 21 |
|
| 22 |
3. Rollback is demonstrated by returning a record count. This time creating the |
| 23 |
transaction in place. |
| 24 |
|
| 25 |
4. The above two steps are repeated but with a named parameter ad an implicit end to the transaction. |
| 26 |
|
| 27 |
5. Note implicit disconnect on end |
| 28 |
} |
| 29 |
|
| 30 |
interface |
| 31 |
|
| 32 |
uses |
| 33 |
Classes, SysUtils, TestManager, IB; |
| 34 |
|
| 35 |
type |
| 36 |
{ TTest3 } |
| 37 |
|
| 38 |
TTest3 = class(TTestBase) |
| 39 |
private |
| 40 |
procedure DoQuery(Attachment: IAttachment); |
| 41 |
public |
| 42 |
function TestTitle: AnsiString; override; |
| 43 |
procedure RunTest(CharSet: AnsiString; SQLDialect: integer); override; |
| 44 |
end; |
| 45 |
|
| 46 |
|
| 47 |
implementation |
| 48 |
|
| 49 |
{ TTest3 } |
| 50 |
|
| 51 |
procedure TTest3.DoQuery(Attachment: IAttachment); |
| 52 |
var Transaction: ITransaction; |
| 53 |
ResultSet: IResultSet; |
| 54 |
Statement: IStatement; |
| 55 |
TPB: ITPB; |
| 56 |
begin |
| 57 |
writeln(OutFile,'Employee Count = ',Attachment.OpenCursorAtStart('Select count(*) from EMPLOYEE')[0].AsInteger); |
| 58 |
|
| 59 |
TPB := FirebirdAPI.AllocateTPB; |
| 60 |
TPB.Add(isc_tpb_write); |
| 61 |
TPB.Add(isc_tpb_nowait); |
| 62 |
TPB.Add(isc_tpb_concurrency); |
| 63 |
TPB.Add(isc_tpb_lock_read).AsString := 'EMPLOYEE'; |
| 64 |
TPB.Add(isc_tpb_protected); |
| 65 |
Transaction := Attachment.StartTransaction(TPB,taRollback); |
| 66 |
Attachment.ExecuteSQL(Transaction, 'Execute Procedure DELETE_EMPLOYEE ?', [8]); |
| 67 |
|
| 68 |
ResultSet := Attachment.OpenCursorAtStart( |
| 69 |
Transaction, |
| 70 |
'Select count(*) from EMPLOYEE',3); |
| 71 |
|
| 72 |
writeln(OutFile,'Employee Count = ',ResultSet[0].AsInteger); |
| 73 |
|
| 74 |
ResultSet := Attachment.OpenCursorAtStart('Select count(*) from EMPLOYEE'); |
| 75 |
writeln(OutFile,'Employee Count = ',ResultSet[0].AsInteger); |
| 76 |
|
| 77 |
{$IFNDEF FPC} |
| 78 |
Transaction.Rollback; {Delphi does not dispose of interfaces until the end of the function |
| 79 |
so we need to explicitly rollback here. FPC will dispose of the |
| 80 |
interface as soon as it is overwritten - hence this is not needed.} |
| 81 |
{$ENDIF} |
| 82 |
Transaction := Attachment.StartTransaction([isc_tpb_write,isc_tpb_nowait,isc_tpb_concurrency],taRollback); |
| 83 |
Statement := Attachment.PrepareWithNamedParameters(Transaction,'Execute Procedure DELETE_EMPLOYEE :EMP_NO',3); |
| 84 |
Statement.GetSQLParams.ByName('EMP_NO').AsInteger := 8; |
| 85 |
Statement.Execute; |
| 86 |
|
| 87 |
ResultSet := Attachment.OpenCursorAtStart( |
| 88 |
Transaction, |
| 89 |
'Select count(*) from EMPLOYEE',3); |
| 90 |
|
| 91 |
writeln(OutFile,'Employee Count = ',ResultSet[0].AsInteger); |
| 92 |
|
| 93 |
Transaction := nil; {implicit rollback} |
| 94 |
|
| 95 |
|
| 96 |
writeln(OutFile,'Employee Count = ',Attachment.OpenCursorAtStart( |
| 97 |
Attachment.StartTransaction([isc_tpb_read,isc_tpb_nowait,isc_tpb_concurrency],taCommit), |
| 98 |
'Select count(*) As Counter from EMPLOYEE',3)[0].AsInteger); |
| 99 |
|
| 100 |
writeln(OutFile,'Constrained Employee Count = ',Attachment.OpenCursorAtStart( |
| 101 |
Attachment.StartTransaction([isc_tpb_read,isc_tpb_nowait,isc_tpb_concurrency],taCommit), |
| 102 |
'Select count(*) As Counter from EMPLOYEE Where EMP_NO < ?',3,[8])[0].AsInteger); |
| 103 |
|
| 104 |
end; |
| 105 |
|
| 106 |
function TTest3.TestTitle: AnsiString; |
| 107 |
begin |
| 108 |
Result := 'Test 3: ad hoc queries'; |
| 109 |
end; |
| 110 |
|
| 111 |
procedure TTest3.RunTest(CharSet: AnsiString; SQLDialect: integer); |
| 112 |
var Attachment: IAttachment; |
| 113 |
DPB: IDPB; |
| 114 |
begin |
| 115 |
DPB := FirebirdAPI.AllocateDPB; |
| 116 |
DPB.Add(isc_dpb_user_name).AsString := Owner.GetUserName; |
| 117 |
DPB.Add(isc_dpb_password).AsString := Owner.GetPassword; |
| 118 |
DPB.Add(isc_dpb_lc_ctype).AsString := CharSet; |
| 119 |
DPB.Add(isc_dpb_set_db_SQL_dialect).AsByte := SQLDialect; |
| 120 |
|
| 121 |
writeln(OutFile,'Opening ',Owner.GetEmployeeDatabaseName); |
| 122 |
Attachment := FirebirdAPI.OpenDatabase(Owner.GetEmployeeDatabaseName,DPB); |
| 123 |
writeln(OutFile,'Database Open'); |
| 124 |
DoQuery(Attachment); |
| 125 |
end; |
| 126 |
|
| 127 |
initialization |
| 128 |
RegisterTest(TTest3); |
| 129 |
|
| 130 |
end. |
| 131 |
|
