Table locks in SQLite accessed by fireDAC - sqlite

Question

I'm working on porting a set of paradox tables to SQLite. In order to do so, I created a test application that simulates (somewhat) the current usage scenario: multiple users accessing the same DB file and performing simultaneous read and writes.
The application is very simple: it will start several threads that each create a connection, opens a table and will randomly read, update or insert inside the table.
Almost immediately, The application encounters a "database table locked" error. I have tried several things to attempt to work around it but nothing seems to work. What am I doing wrong ?
Here is the code internal to the threads:
procedure testDB(TargetFolder: string);
var
Conn: TFDConnection;
Table: TFDTable;
i: Integer;
begin
randomize;
Conn := TFDConnection.Create(nil);
try
Conn.DriverName := 'SQLite';
Conn.LoginPrompt := false;
Conn.Params.clear;
Conn.Params.Database := TPath.Combine(TargetFolder, 'testDB.sdb');
Conn.Params.Add('DriverID=SQLite');
// all this is the result of several attemp to fix the table locking error. none worked
Conn.Params.Add('LockingMode=Normal');
Conn.Params.Add('Synchronous=Normal');
Conn.UpdateOptions.UpdateMode := TUpdateMode.upWhereAll;
Conn.UpdateOptions.LockWait := True;
Conn.UpdateOptions.LockMode := TFDLockMode.lmPessimistic;
Conn.UpdateOptions.LockPoint := TFDLockPoint.lpImmediate;
Conn.UpdateOptions.AssignedValues := [uvLockMode,uvLockPoint,uvLockWait];
Conn.Open();
Conn.ExecSQL('CREATE TABLE IF NOT EXISTS ''test'' (''ID'' INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT UNIQUE,''data1'' TEXT NOT NULL,''data2'' INTEGER NOT NULL)');
Table := TFDTable.Create(nil);
try
table.Connection := Conn;
while True do
begin
case Trunc(Random(10)) of
0..3:
begin
table.Open('test');
try
if table.Locate('data1', 'name'+intToStr(Trunc(Random(10))),[TLocateOption.loCaseInsensitive]) then
begin
table.Edit;
table.FieldByName('data2').AsInteger := table.FieldByName('data2').AsInteger + 1;
table.Post;
end;
finally
table.close;
end;
end;
4..8:
begin
table.Open('test');
try
i := Trunc(Random(10));
if not table.Locate('data1', 'name'+ i.ToString,[TLocateOption.loCaseInsensitive]) then
begin
table.AppendRecord([null, 'name'+ i.ToString, 0]);
end;
finally
table.close;
end;
end
else
break;
end;
end;
finally
FreeAndNil(Table);
end;
finally
FreeAndNil(Conn);
end;
end;

Answer 1

Thanks to Victoria, I managed to find the right parameters.
Conn := TFDConnection.Create(nil);
try
Conn.DriverName := 'SQLite';
Conn.LoginPrompt := false;
Conn.Params.clear;
Conn.Params.Database := TPath.Combine(TargetFolder, 'testDB.sdb');
Conn.Params.Add('DriverID=SQLite');
Conn.Params.Add('SharedCache=False');
Conn.Params.Add('LockingMode=Normal');
Conn.Params.Add('Synchronous=Normal');
Conn.UpdateOptions.LockWait := True;
Conn.Open();
Thanks again