Inno Setup: add GUI to connect to SQL

问题:

Complete Inno Setup and Pascal newbie here. I want to package a single .sql file inside a setup.exe.

The setup will be available for download so I can't embed any connection strings within the setup project. The setup basically installs an .NET CLR assembly (dll as hex stream) into the supplied SQL server database by running a simple .sql script

I've seen the other posts on here about connecting to an SQL server but none address my issue of a hardcoded connection string or replicating/implementing the generic Data Connection Dialog that pops up in all MS apps for making a DB connection

Ideally the creation of the connection string should be handled via the Data Connection Dialog that MS have released the code for http://archive.msdn.microsoft.com/Connection but have no idea how to link this to pop up during the install.

If not possible without (too much) effort then another option would be to have a custom cut down version of the dialog screen within Inno Setup with just the server name\path text box.

A checkbox to specify whether to use Windows or SQL server authentication (username/pass text boxes gets enabled when SQL authentication is selected)

At which point the connection is attempted and a drop down with the available databases appears.

I can get the server\instance text box working but have no idea how to implement the Windows authentication\SQL authentication combo box and subsequent actions

Tips?

edit: Thanks TLama, the MS supplied connection dialog UI seems like a no go then. I've gotten the 'appearance' aspect right using the Inno Setup form wizard, but some of the functionality still baffles me:

I have no idea how to

• enable/disable the lblUser, lblPassword, txtUsername, txtPassword when chkSQLAuth.selected is true/false.

• enable the lstDatabase combo box and label once there is content in the txtServer textbox.

• populate the lstDatabase combo box using the credentials specified (connect to server and execute "SELECT name FROM master.dbo.sysdatabases WHERE HAS_DBACCESS(name) = 1 ORDER BY name") on click of the lstDatabase.

• Then enable the Next button when a database is selected.

I think once that's done I should be able to figure out how to execute my SQL script against the selected database!

[Setup]
AppName=test
AppVersion=1.0
LicenseFile=C:\Program Files (x86)\Inno Script Studio\License.rtf
CreateAppDir=False
UsePreviousGroup=False
DisableProgramGroupPage=yes
Uninstallable=no

[Files]
Source: "C:\Install Assembly.sql"; DestDir: "{tmp}"; Flags: dontcopy


[CustomMessages]
CustomForm_Caption=Connect to Database Server
CustomForm_Description=Enter the information required to connect to the database server
CustomForm_lblServer_Caption0=Server name:
CustomForm_lblAuthType_Caption0=Log on credentials
CustomForm_lblUser_Caption0=User name:
CustomForm_lblPassword_Caption0=Password:
CustomForm_lblDatabase_Caption0=Database:
CustomForm_chkSQLAuth_Caption0=Use SQL Server Authentication
CustomForm_chkWindowsAuth_Caption0=Use Windows Authentication

[Code]
var
  lblServer: TLabel;
  lblAuthType: TLabel;
  lblUser: TLabel;
  lblPassword: TLabel;
  lblDatabase: TLabel;
  chkSQLAuth: TRadioButton;
  txtServer: TEdit;
  chkWindowsAuth: TRadioButton;
  txtUsername: TEdit;
  txtPassword: TPasswordEdit;
  lstDatabase: TComboBox;

 var
  Page: TWizardPage;
{ CustomForm_Activate }

procedure CustomForm_Activate(Page: TWizardPage);
begin
  // enter code here...
end;

{ CustomForm_ShouldSkipPage }

function CustomForm_ShouldSkipPage(Page: TWizardPage): Boolean;
begin
  Result := False;
end;

{ CustomForm_BackButtonClick }

function CustomForm_BackButtonClick(Page: TWizardPage): Boolean;
begin
  Result := True;
end;

{ CustomForm_NextkButtonClick }

function CustomForm_NextButtonClick(Page: TWizardPage): Boolean;
begin
  Result := True;
end;

{ CustomForm_CancelButtonClick }

procedure CustomForm_CancelButtonClick(Page: TWizardPage; var Cancel, Confirm: Boolean);
begin
  // enter code here...
end;

{ CustomForm_CreatePage }

function CustomForm_CreatePage(PreviousPageId: Integer): Integer;
begin
  Page := CreateCustomPage(
    PreviousPageId,
    ExpandConstant('{cm:CustomForm_Caption}'),
    ExpandConstant('{cm:CustomForm_Description}')
  );

  { lblServer }
  lblServer := TLabel.Create(Page);
  with lblServer do
  begin
    Parent := Page.Surface;
    Caption := ExpandConstant('{cm:CustomForm_lblServer_Caption0}');
    Left := ScaleX(24);
    Top := ScaleY(8);
    Width := ScaleX(68);
    Height := ScaleY(13);
  end;

  { txtServer }
  txtServer := TEdit.Create(Page);
  with txtServer do
  begin
    Parent := Page.Surface;
    Left := ScaleX(112);
    Top := ScaleY(8);
    Width := ScaleX(273);
    Height := ScaleY(21);
    TabOrder := 0;
  end;


  { lblAuthType }
  lblAuthType := TLabel.Create(Page);
  with lblAuthType do
  begin
    Parent := Page.Surface;
    Caption := ExpandConstant('{cm:CustomForm_lblAuthType_Caption0}');
    Left := ScaleX(24);
    Top := ScaleY(48);
    Width := ScaleX(87);
    Height := ScaleY(13);
  end;


  { chkWindowsAuth }
  chkWindowsAuth := TRadioButton.Create(Page);
  with chkWindowsAuth do
  begin
    Parent := Page.Surface;
    Caption := ExpandConstant('{cm:CustomForm_chkWindowsAuth_Caption0}');
    Left := ScaleX(32);
    Top := ScaleY(64);
    Width := ScaleX(177);
    Height := ScaleY(17);
    Checked := True;
    TabOrder := 1;
    TabStop := True;
  end;

  { chkSQLAuth }
  chkSQLAuth := TRadioButton.Create(Page);
  with chkSQLAuth do
  begin
    Parent := Page.Surface;
    Caption := ExpandConstant('{cm:CustomForm_chkSQLAuth_Caption0}');
    Left := ScaleX(32);
    Top := ScaleY(84);
    Width := ScaleX(185);
    Height := ScaleY(17);
    TabOrder := 2;
  end;


  { lblUser }
  lblUser := TLabel.Create(Page);
  with lblUser do
  begin
    Parent := Page.Surface;
    Caption := ExpandConstant('{cm:CustomForm_lblUser_Caption0}');
    Left := ScaleX(56);
    Top := ScaleY(104);
    Width := ScaleX(58);
    Height := ScaleY(13);
    Enabled := False;
  end;

  { lblPassword }
  lblPassword := TLabel.Create(Page);
  with lblPassword do
  begin
    Parent := Page.Surface;
    Caption := ExpandConstant('{cm:CustomForm_lblPassword_Caption0}');
    Left := ScaleX(56);
    Top := ScaleY(128);
    Width := ScaleX(53);
    Height := ScaleY(13);
    Enabled := False;
  end;

  { txtUsername }
  txtUsername := TEdit.Create(Page);
  with txtUsername do
  begin
    Parent := Page.Surface;
    Left := ScaleX(120);
    Top := ScaleY(104);
    Width := ScaleX(241);
    Height := ScaleY(21);
    Enabled := False;
    TabOrder := 3;
  end;

  { txtPassword }
  txtPassword := TPasswordEdit.Create(Page);
  with txtPassword do
  begin
    Parent := Page.Surface;
    Left := ScaleX(120);
    Top := ScaleY(128);
    Width := ScaleX(241);
    Height := ScaleY(21);
    Enabled := False;
    TabOrder := 4;
  end;

   { lblDatabase }
  lblDatabase := TLabel.Create(Page);
  with lblDatabase do
  begin
    Parent := Page.Surface;
    Caption := ExpandConstant('{cm:CustomForm_lblDatabase_Caption0}');
    Left := ScaleX(56);
    Top := ScaleY(168);
    Width := ScaleX(53);
    Height := ScaleY(13);
  end;

  { lstDatabase }
  lstDatabase := TComboBox.Create(Page);
  with lstDatabase do
  begin
    Parent := Page.Surface;
    Left := ScaleX(120);
    Top := ScaleY(168);
    Width := ScaleX(145);
    Height := ScaleY(21);
    TabOrder := 5;
  end;

  with Page do
  begin
    OnActivate := @CustomForm_Activate;
    OnShouldSkipPage := @CustomForm_ShouldSkipPage;
    OnBackButtonClick := @CustomForm_BackButtonClick;
    OnNextButtonClick := @CustomForm_NextButtonClick;
    OnCancelButtonClick := @CustomForm_CancelButtonClick;
  end;

  Result := Page.ID;
end;

procedure CurPageChanged(CurPageID: Integer);
begin
  if CurPageID = Page.ID then
    WizardForm.NextButton.Enabled := False;  
end;

{ CustomForm_InitializeWizard }

procedure InitializeWizard();
begin
  CustomForm_CreatePage(wpWelcome);
end;

回答1:

Got it working. Here it is in case someone else wants similar functionality. Just change the link to the license and the .sql file references

[Setup]
AppName=test
AppVersion=1.0
LicenseFile=C:\setup demo\License.rtf
CreateAppDir=False
UsePreviousGroup=False
DisableProgramGroupPage=yes
Uninstallable=no

[Files]
Source: "C:\setup demo\script 2008R2.sql"; Flags: dontcopy
Source: "C:\setup demo\script 2012.sql"; Flags: dontcopy

[CustomMessages]
CustomForm_Caption=Connect to Database Server
CustomForm_Description=Enter the information required to connect to the database server
CustomForm_lblServer_Caption0=Server name:
CustomForm_lblAuthType_Caption0=Log on credentials
CustomForm_lblUser_Caption0=User name:
CustomForm_lblPassword_Caption0=Password:
CustomForm_lblDatabase_Caption0=Database:
CustomForm_lblVersion_Caption0=SQL Version:
CustomForm_chkSQLAuth_Caption0=Use SQL Server Authentication
CustomForm_chkWindowsAuth_Caption0=Use Windows Authentication
CustomForm_lstVersion_Line0=2008 R2
CustomForm_lstVersion_Line1=2012

[Code]
const
  adCmdUnspecified = $FFFFFFFF;
  adCmdUnknown = $00000008;
  adCmdText = $00000001;
  adCmdTable = $00000002;
  adCmdStoredProc = $00000004;
  adCmdFile = $00000100;
  adCmdTableDirect = $00000200;
  adOptionUnspecified = $FFFFFFFF;
  adAsyncExecute = $00000010;
  adAsyncFetch = $00000020;
  adAsyncFetchNonBlocking = $00000040;
  adExecuteNoRecords = $00000080;
  adExecuteStream = $00000400;
  adExecuteRecord = $00000800;

var
  lblVersion: TLabel;
  lstVersion: TComboBox;
  lblServer: TLabel;
  lblAuthType: TLabel;
  lblUser: TLabel;
  lblPassword: TLabel;
  lblDatabase: TLabel;
  chkSQLAuth: TRadioButton;
  txtServer: TEdit;
  chkWindowsAuth: TRadioButton;
  txtUsername: TEdit;
  txtPassword: TPasswordEdit;
  lstDatabase: TComboBox;
  bIsNextEnabled: Boolean;

 var
  Page: TWizardPage;

{ Used to generate error code by sql script errors }
procedure ExitProcess(exitCode:integer);
  external '[e-mail] stdcall';

{ Version drop down defaults to blank. Enable server textbox once a version is selected. This forces user to select the version first. }
Procedure VersionOnChange (Sender: TObject);
begin                            
  lblServer.Enabled := True;
  txtServer.Enabled := True;
end;

{ enable/disable child text boxes & functions when text has been entered into Server textbox. Makes no sense to populate child items unless a value exists for server. }
Procedure ServerOnChange (Sender: TObject);
begin                            
  lstDatabase.Items.Clear;
  lstDatabase.Text := '';
  bIsNextEnabled := False;
  WizardForm.NextButton.Enabled := bIsNextEnabled;
  if Length(txtServer.Text) > 0 then
  begin
    lblAuthType.Enabled := True;
    lblDatabase.Enabled := True;
    lstDatabase.Enabled := True;
    chkWindowsAuth.Enabled := True;
    chkSQLAuth.Enabled := True;
  end
  else
  begin
    lblAuthType.Enabled := False;
    lblDatabase.Enabled := False;
    lstDatabase.Enabled := False; 
    chkWindowsAuth.Enabled := False;
    chkSQLAuth.Enabled := False;
  end
end;

{ enable/disable user/pass text boxes depending on selected auth type. A user/pass is only required for SQL Auth }
procedure  AuthOnChange (Sender: TObject);
begin
  if chkSQLAuth.Checked then
  begin
    lblUser.Enabled := true;
    lblPassword.Enabled := true;
    txtUsername.Enabled := true;
    txtPassword.Enabled := true;
  end
  Else
  begin
    lblUser.Enabled := false;
    lblPassword.Enabled := false;
    txtUsername.Enabled := false;
    txtPassword.Enabled := false;
  end
end;

{ Enable next button once a database name has been entered. }
Procedure DatabaseOnChange (Sender: TObject);
begin
  if (Length(lstDatabase.Text) > 0) and (lstDatabase.Enabled) then
  begin
    bIsNextEnabled := True;
    WizardForm.NextButton.Enabled := bIsNextEnabled;  
  end
  else
  begin
    bIsNextEnabled := False;
    WizardForm.NextButton.Enabled := bIsNextEnabled;  
  end
end;

{ Retrieve a list of databases accessible on the server with the credentials specified. }
{ This list is shown in the database dropdown list }
procedure RetrieveDatabaseList(Sender: TObject);
var  
  ADOCommand: Variant;
  ADORecordset: Variant;
  ADOConnection: Variant;  
begin
  lstDatabase.Items.Clear;
  try
    { create the ADO connection object }
    ADOConnection := CreateOleObject('ADODB.Connection');
    { build a connection string; for more information, search for ADO }
    { connection string on the Internet  }
    ADOConnection.ConnectionString := 
      'Provider=SQLOLEDB;' +               { provider }
      'Data Source=' + txtServer.Text + ';' +   { server name }
      'Application Name=' + '{#SetupSetting("AppName")}' + ' DB List;'
    if chkWindowsAuth.Checked then
      ADOConnection.ConnectionString := ADOConnection.ConnectionString +
      'Integrated Security=SSPI;'         { Windows Auth }
    else
      ADOConnection.ConnectionString := ADOConnection.ConnectionString +
      'User Id=' + txtUsername.Text + ';' +              { user name }
      'Password=' + txtPassword.Text + ';';                   { password }
    { open the connection by the assigned ConnectionString }
    ADOConnection.Open;
    try
      { create the ADO command object }
      ADOCommand := CreateOleObject('ADODB.Command');
      { assign the currently opened connection to ADO command object }
      ADOCommand.ActiveConnection := ADOConnection;
      { assign text of a command to be issued against a provider }
      ADOCommand.CommandText := 'SELECT name FROM master.dbo.sysdatabases WHERE HAS_DBACCESS(name) = 1 ORDER BY name';
      { this property setting means, that you're going to execute the }
      { CommandText text command; it does the same, like if you would }
      { use only adCmdText flag in the Execute statement }
      ADOCommand.CommandType := adCmdText;
      { this will execute the command and return dataset }
      ADORecordset := ADOCommand.Execute;
      { get values from a dataset using 0 based indexed field access; }
      { notice, that you can't directly concatenate constant strings }
      { with Variant data values }
      while not ADORecordset.eof do 
      begin
       lstDatabase.Items.Add(ADORecordset.Fields(0));
       ADORecordset.MoveNext;
      end

    finally
      ADOConnection.Close;
    end;
  except
    MsgBox(GetExceptionMessage, mbError, MB_OK);
  end;
end;

{ Execute files specified in [files] section (hardcoded) against the user defined server.database }
procedure DeploySQL();
var  
  Script2008R2: AnsiString;  
  Script2012: AnsiString;    
  ADOCommand: Variant;
  ADOConnection: Variant;  
begin
{ extract required version of script }
  if lstVersion.Text='2008 R2' then
    ExtractTemporaryFile('Script 2008R2.sql')
  if lstVersion.Text='2012' then
    ExtractTemporaryFile('Script 2012.sql');

  try
    { create the ADO connection object }
    ADOConnection := CreateOleObject('ADODB.Connection');
    { build a connection string; for more information, search for ADO }
    { connection string on the Internet }
    ADOConnection.ConnectionString := 
      'Provider=SQLOLEDB;' +               { provider }
      'Data Source=' + txtServer.Text + ';' +   { server name }
      'Initial Catalog=' + lstDatabase.Text + ';' +   { server name }
      'Application Name=' + '{#SetupSetting("AppName")}' + ' Execute SQL;' ;     
    if chkWindowsAuth.Checked then
      ADOConnection.ConnectionString := ADOConnection.ConnectionString +
      'Integrated Security=SSPI;'         { Windows Auth }
    else
      ADOConnection.ConnectionString := ADOConnection.ConnectionString +
      'User Id=' + txtUsername.Text + ';' +              { user name }
      'Password=' + txtPassword.Text + ';';                   { password }
    { open the connection by the assigned ConnectionString }
    ADOConnection.Open;
    try
      { create the ADO command object }
      ADOCommand := CreateOleObject('ADODB.Command');
      { assign the currently opened connection to ADO command object }
      ADOCommand.ActiveConnection := ADOConnection;
      { load a script from file into variable. Exclusive OR because both versions should never exist at the same time. }
        if (LoadStringFromFile(ExpandConstant('{tmp}\Script 2012.sql'), Script2012)) xor (LoadStringFromFile(ExpandConstant('{tmp}\Script 2008R2.sql'), Script2008R2))     then
      begin
        { assign text of a command to be issued against a provider. Append all 3 because one of the install assembly strings will always be empty. }
        ADOCommand.CommandText := Script2008R2 + Script2012;
        { this will execute the script; the adCmdText flag here means }
        { you're going to execute the CommandText text command, while }
        { the adExecuteNoRecords flag ensures no data row will be get }
        { from a provider, what should improve performance }
        ADOCommand.Execute(NULL, NULL, adCmdText or adExecuteNoRecords);
      end
      else
      begin
        MsgBox('Installation files missing.', mbError, MB_OK);
        ExitProcess(7);
      end
    finally
      ADOConnection.Close;
    end;
  except
    MsgBox(GetExceptionMessage, mbError, MB_OK);
    ExitProcess(5);
  end;
end;

{ CustomForm_NextkButtonClick }
{ try to connect to supplied db. Dont need to catch errors/close conn on error because a failed connection is never opened. }
function CustomForm_NextButtonClick(Page: TWizardPage): Boolean;
var  
  ADOConnection: Variant;  
begin
    { create the ADO connection object }
    ADOConnection := CreateOleObject('ADODB.Connection');
    { build a connection string; for more information, search for ADO }
    { connection string on the Internet }
    ADOConnection.ConnectionString := 
      'Provider=SQLOLEDB;' +               { provider }
      'Data Source=' + txtServer.Text + ';' +   { server name }
      'Initial Catalog=' + lstDatabase.Text + ';' +   { server name }
      'Application Name=' + '{#SetupSetting("AppName")}' + ' Execute SQL;' ;     
    if chkWindowsAuth.Checked then
      ADOConnection.ConnectionString := ADOConnection.ConnectionString +
      'Integrated Security=SSPI;'         { Windows Auth }
    else
      ADOConnection.ConnectionString := ADOConnection.ConnectionString +
      'User Id=' + txtUsername.Text + ';' +              { user name }
      'Password=' + txtPassword.Text + ';';                   { password }
    { open the connection by the assigned ConnectionString }
    ADOConnection.Open;
    Result := True;
end;

{ CustomForm_CreatePage }

function CustomForm_CreatePage(PreviousPageId: Integer): Integer;
begin

  Page := CreateCustomPage(
    PreviousPageId,
    ExpandConstant('{cm:CustomForm_Caption}'),
    ExpandConstant('{cm:CustomForm_Description}')
  );

  { lblVersion }
  lblVersion := TLabel.Create(Page);
  with lblVersion do
  begin
    Parent := Page.Surface;
    Caption := ExpandConstant('{cm:CustomForm_lblVersion_Caption0}');
    Left := ScaleX(24);
    Top := ScaleY(8);
    Width := ScaleX(61);
    Height := ScaleY(13);
  end;

  { lstVersion }
  lstVersion := TComboBox.Create(Page);
  with lstVersion do
  begin
    Parent := Page.Surface;
    Left := ScaleX(112);
    Top := ScaleY(8);
    Width := ScaleX(145);
    Height := ScaleY(21);
    Style := csDropDownList;
    DropDownCount := 2;
    TabOrder := 0;
    Items.Add(ExpandConstant('{cm:CustomForm_lstVersion_Line0}'));
    Items.Add(ExpandConstant('{cm:CustomForm_lstVersion_Line1}'));
    OnChange:= @VersionOnChange;

  end;

  { lblServer }
  lblServer := TLabel.Create(Page);
  with lblServer do
  begin
    Parent := Page.Surface;
    Caption := ExpandConstant('{cm:CustomForm_lblServer_Caption0}');
    Left := ScaleX(24);
    Top := ScaleY(32);
    Width := ScaleX(68);
    Height := ScaleY(13);
    Enabled := False;
  end;

  { txtServer }
  txtServer := TEdit.Create(Page);
  with txtServer do
  begin
    Parent := Page.Surface;
    Left := ScaleX(112);
    Top := ScaleY(32);
    Width := ScaleX(273);
    Height := ScaleY(21);
    TabOrder := 1;
    Enabled := False;
    OnChange := @ServerOnChange;
  end;

  { lblAuthType }
  lblAuthType := TLabel.Create(Page);
  with lblAuthType do
  begin
    Parent := Page.Surface;
    Caption := ExpandConstant('{cm:CustomForm_lblAuthType_Caption0}');
    Left := ScaleX(24);
    Top := ScaleY(72);
    Width := ScaleX(87);
    Height := ScaleY(13);
    Enabled := False;
  end;

  { chkWindowsAuth }
  chkWindowsAuth := TRadioButton.Create(Page);
  with chkWindowsAuth do
  begin
    Parent := Page.Surface;
    Caption := ExpandConstant('{cm:CustomForm_chkWindowsAuth_Caption0}');
    Left := ScaleX(32);
    Top := ScaleY(88);
    Width := ScaleX(177);
    Height := ScaleY(17);
    Checked := True;
    TabOrder := 2;
    TabStop := True;
    OnClick := @AuthOnChange;
    Enabled := False;
  end;

  { chkSQLAuth }
  chkSQLAuth := TRadioButton.Create(Page);
  with chkSQLAuth do
  begin
    Parent := Page.Surface;
    Caption := ExpandConstant('{cm:CustomForm_chkSQLAuth_Caption0}');
    Left := ScaleX(32);
    Top := ScaleY(108);
    Width := ScaleX(185);
    Height := ScaleY(17);
    TabOrder := 3;
    OnClick := @AuthOnChange;
    Enabled := False;
  end;

  { lblUser }
  lblUser := TLabel.Create(Page);
  with lblUser do
  begin
    Parent := Page.Surface;
    Caption := ExpandConstant('{cm:CustomForm_lblUser_Caption0}');
    Left := ScaleX(56);
    Top := ScaleY(128);
    Width := ScaleX(58);
    Height := ScaleY(13);
    Enabled := False;
  end;

  { lblPassword }
  lblPassword := TLabel.Create(Page);
  with lblPassword do
  begin
    Parent := Page.Surface;
    Caption := ExpandConstant('{cm:CustomForm_lblPassword_Caption0}');
    Left := ScaleX(56);
    Top := ScaleY(152);
    Width := ScaleX(53);
    Height := ScaleY(13);
    Enabled := False;
  end;

  { txtUsername }
  txtUsername := TEdit.Create(Page);
  with txtUsername do
  begin
    Parent := Page.Surface;
    Left := ScaleX(120);
    Top := ScaleY(128);
    Width := ScaleX(241);
    Height := ScaleY(21);
    Enabled := False;
    TabOrder := 4;
  end;

  { txtPassword }
  txtPassword := TPasswordEdit.Create(Page);
  with txtPassword do
  begin
    Parent := Page.Surface;
    Left := ScaleX(120);
    Top := ScaleY(152);
    Width := ScaleX(241);
    Height := ScaleY(21);
    Enabled := False;
    TabOrder := 5;
  end;

   { lblDatabase }
  lblDatabase := TLabel.Create(Page);
  with lblDatabase do
  begin
    Parent := Page.Surface;
    Caption := ExpandConstant('{cm:CustomForm_lblDatabase_Caption0}');
    Left := ScaleX(56);
    Top := ScaleY(192);
    Width := ScaleX(53);
    Height := ScaleY(13);
    Enabled := False;
  end;

  { lstDatabase }
  lstDatabase := TComboBox.Create(Page);
  with lstDatabase do
  begin
    Parent := Page.Surface;
    Left := ScaleX(120);
    Top := ScaleY(192);
    Width := ScaleX(145);
    Height := ScaleY(21);
    Enabled := False;
    TabOrder := 6;    
    OnDropDown:= @RetrieveDatabaseList;
    OnChange:= @DatabaseOnChange;
  end;

  with Page do
  begin
    OnNextButtonClick := @CustomForm_NextButtonClick;
  end;

  Result := Page.ID;
end;

procedure CurPageChanged(CurPageID: Integer);
begin
{ set initial status of next button. Should be disabled when page is first loaded, but should be enabled if user clicked back. }
  if CurPageID = Page.ID then
    WizardForm.NextButton.Enabled := bIsNextEnabled;  
end;

procedure CurStepChanged(CurStep: TSetupStep);
begin
{ The preinstall step seems like the best time to do the actual install. The problem is that this is not a traditional install. Nothing is copied to the users' pc }
  if CurStep = ssInstall then
    DeploySQL;  
end;

procedure InitializeWizard();
begin
  bIsNextEnabled := False;
  CustomForm_CreatePage(wpLicense);
end;