MsAccess administration from Delphi

A very usefull unit with ms access administration function like compact, get views etc using DAO…. I hope you find it usefull….

unit mdbUtils;

interface
uses windows,classes,sysutils,dao2000, comobj,
adodb{$ifdef ver140},variants{$endif},dialogs;

type
  TFieldRec=record
    fieldname:string;
    fieldType,fieldSize:integer;
    Required:boolean;
    DefaultValue:olevariant;
    ForeignName:string;
  end;
  TFieldRecArray=Array of TFieldRec;

  TrelationRec=record
    name,table,foreignTable:string;
    Attributes:integer;
    fields:TfieldRecArray;
  end;
  TRelationArray=array of TrelationRec;

  TindexRec=record
    name:string;
    primary,unique,Required:boolean;
    fields:TfieldRecArray;
  end;
  TIndexRecArray=array of TIndexRec;

  TParamRec=record
    value :olevariant;
    type_:smallint;
    Direction:smallint;
    name : widestring;
  end;
  TparamRecArray=array of TparamRec;

  TqueryDef=record
    name:string;
    sql:string;
  end;
  TqueryDefArray=array of TqueryDef;

function GetWinTempFile:string;
procedure CompactMdbDatabase(srcDbname,dstDbname,oldpwd,newpwd:string;bAccess97:boolean=true);
procedure CompactMdbDatabaseX(Dbname,pwd:string);
procedure changeMdbPwd(dbname,oldpwd,newpwd:string;bAccess97:boolean=true);
procedure clearLinkTables(dbname,pwd:string);
procedure connectx(srcName, srcPwd, dstName, dstPwd,suffix: String);

function ConnectAdo(adoconnection:TadoConnection;dbName,pwd:string):boolean;
function CreateMdb(dbname,pwd:string):boolean;
function OpenDatabase(dbname,pwd:string):database;
//relations
function GetRelations(dbname,pwd:string):TrelationArray;
procedure ClearRelations(dbname,pwd:string);
procedure CreateRelations(dbname,pwd:string;rs:TrelationArray);

//recordset
function createMDBTable(db:database;tbname:string;fldArray:TFieldRecArray;IdxArray:TIndexRecArray):tableDef;
procedure AlterMdbTable(db:database;tbname:string;fldArray:TfieldRecArray;IdxArray:TindexRecArray);
procedure renameMDBtable(db:database;srctbname,dstTbname:string);
procedure copyMdbTable(db:database;srcTdf,dstTdf:TableDef);
procedure dropmdbTable(db:database;tbname:string);

//querydefs
function getQuerydefs(dbname,pwd:string):TquerydefArray;
function clearQuerydefs(db:database):boolean;
function createQueryDef(db:database;qdf:TqueryDef):queryDef;
function createQueryDefs(db:database;qa:TquerydefArray):boolean;
function getAQuerydefsSQL(qryname,dbname,pwd:string):String;

implementation

function createQueryDefs(db:database;qa:TquerydefArray):boolean;
var i:integer;
begin
  result := false;
  for i:=0 to high(qa) do
  begin
    db.createQueryDef(qa[i].name,qa[i].sql);
  end;
  result := true;
end;

function createQueryDef(db:database;qdf:TqueryDef):queryDef;
var i:integer;
begin
  result := nil;
  result := db.CreateQueryDef(qdf.name,qdf.sql);
end;

function clearQuerydefs(db:database):boolean;
var i:integer;
begin
  for i:= db.QueryDefs.count -1 downto 0 do
  begin
    db.querydefs.Delete(db.querydefs[i].Name);
  end;
  db.QueryDefs.Refresh;
end;

function getQuerydefs(dbname,pwd:string):TquerydefArray;
var db:database;
    i,j:integer;
begin
  db := opendatabase(dbname,pwd);
  setlength(result,db.querydefs.count);
  for i:=0 to db.QueryDefs.count-1 do
  begin
    result[i].name := db.QueryDefs[i].Name;
    result[i].sql := db.QueryDefs[i].sql;
  end;
end;

function getAQuerydefsSQL(qryname,dbname,pwd:string):String;
var db:database;
    i,j:integer;
    found:Boolean;
begin
  result:='';
  found:=false;
  db := opendatabase(dbname,pwd);
  setlength(result,db.querydefs.count);
  I:=0;
  While (not found) and (i&lt;= db.QueryDefs.count-1) do
  begin
    if (uppercase(db.QueryDefs[i].Name)=upperCase(qryname)) then result:= db.QueryDefs[i].sql;
    Inc(i);
  end;
end;

procedure dropmdbTable(db:database;tbname:string);
begin
  db.TableDefs.Delete(tbname);
  db.TableDefs.Refresh;
end;

procedure copyMdbTable(db:database;srcTdf,dstTdf:TableDef);
const
  sqlstr='insert into %s select %s from %s';
var s:string;
    i:integer;
begin
  s := '';
  for i:=0 to dstTdf.Fields.Count -1 do
  begin
    try
    if assigned(srcTdf.fields[dstTdf.fields[i].name]) then
    begin
      if s&lt;&gt;'' then s := s +',';
      s := s +dstTdf.fields[i].Name;
    end;
    except
    end;
  end;
  if s&lt;&gt;'' then
    db.Execute(format(sqlstr,[dsttdf.name,s,srctdf.name]),DbSQLPassThrough);
end;

procedure renameMDbtable(db:database;srctbname,dstTbname:string);
var tdf:tabledef;
begin
  tdf := db.TableDefs[srctbname];
  if assigned(tdf) then
  begin
    tdf.Set_Name(dstTbname);
    db.TableDefs.Refresh;
  end;
end;

procedure AlterMdbTable(db:database;tbname:string;fldArray:TfieldRecArray;IdxArray:TindexRecArray);
var
  tdfold,tdfnew:tabledef;
  fld:field;
  idx  : _index;
  i ,j : integer;
  bfound:boolean;
begin
  tdfold := db.TableDefs[tbname];
  if not assigned(tdfold) then exit;
  tdfnew := createmdbTable(db,'temp2002xh',fldArray,idxArray);
  copymdbTable(db,tdfold,tdfnew);
  dropmdbTable(db,tbname);
  renameMdbTable(db,'temp2002xh',tbname);
end;

function createMDBTable(db:database;tbname:string;fldArray:TFieldRecArray;IdxArray:TIndexRecArray):tableDef;
var
  tb   : tabledef;
  fld  : field;
  idx  : _index;
  i ,j : integer;
begin
  tb := db.CreateTableDef(tbname,0,'','');
  for i:=0 to high(fldArray) do
  begin
    fld := tb.CreateField(fldarray[i].fieldname,fldarray[i].fieldType,fldArray[i].fieldSize);
    fld.Set_Required(fldArray[i].Required);
    fld.Set_DefaultValue(fldArray[i].DefaultValue);
    tb.Fields.Append(fld);
  end;
  for i:=0 to high(idxArray) do
  begin
    idx := tb.CreateIndex(idxArray[i].name);
    idx.Set_Primary(idxArray[i].primary );
    idx.Set_Unique(idxArray[i].unique);
    idx.Set_Required(idxArray[i].Required);
    for j:=0 to high(idxArray[i].fields) do
    begin
      fld := idx.CreateField(idxArray[i].fields[j].fieldname,idxArray[i].fields[j].fieldType,idxArray[i].fields[j].fieldSize);
      idx.Fields.append(fld);
    end;
    tb.Indexes.Append(idx);
  end;
  db.TableDefs.Append(tb);
  result := tb;
end;

procedure CompactMdbDatabaseX(Dbname,pwd:string);
var tmpdb:string;
begin
  tmpdb := getWinTempfile;
  tmpDb := changefileExt(tmpdb,'.mdb');
  compactMdbDatabase(dbname,tmpdb,pwd,'',false);
  if fileExists(tmpdb) then
  begin
    copyfile(pchar(tmpdb),pchar(dbname),false);
    deletefile(tmpdb);
  end;
end;

procedure CreateRelations(dbname,pwd:string;rs:TrelationArray);
var db:database;
    i,j : integer;
    fld:field;
    r:relation;
begin
  db := opendatabase(dbname,pwd);
  for i:= 0 to high(rs) do
  begin
    r :=  db.CreateRelation(rs[i].name,rs[i].table,rs[i].foreignTable,rs[i].Attributes);
    for j:= 0 to high(rs[i].fields) do
    begin
      fld := r.CreateField(rs[i].fields[j].fieldname,rs[i].fields[j].fieldType,rs[i].fields[j].fieldSize);
      fld.Set_ForeignName(rs[i].fields[j].foreignName);
      r.Fields.Append(fld);
    end;
    db.Relations.Append(r);
  end;
end;

function OpenDatabase(dbname,pwd:string):database;
var db:database;
    dbEngine:_dbengine;
begin
  if pwd &lt;&gt;'' then
    pwd := ';pwd='+pwd;
  dbengine := CreateComObject(dao2000.CLASS_DBEngine) as _DBEngine;
  db := dbengine.OpenDatabase(dbname,dbDriverNoPrompt,True,pwd);
  result :=  db;
end;

function GetRelations(dbname,pwd:string):TrelationArray;
var db:database;
    i,j:integer;
    r:relation;
    tdf:tabledef;
    fn:string;
    fld:field;
begin
  db := opendatabase(dbname,pwd);
  setlength(result,db.Relations.Count);
  for i:=0 to db.Relations.Count -1 do
  begin
    r :=db.Relations.Item[i];
    result[i].name := r.name;
    result[i].table := r.table;
    tdf := db.TableDefs[r.table];
    result[i].foreignTable := r.ForeignTable;
    result[i].Attributes := r.Attributes;
    setlength(result[i].fields,r.Fields.Count);
    for j:=0 to r.fields.Count -1 do
    begin
      result[i].Fields[j].fieldname := r.fields[j].Name;
      fn := r.fields[j].Name;
      fld := tdf.Fields[fn];
      result[i].fields[j].fieldSize := fld.Size;
      result[i].fields[j].fieldType := fld.Type_;
      try
      result[i].fields[j].foreignName := r.fields[j].ForeignName;
      except
        showmessage('error');
      end;
    end;
  end;
end;

function isAccess97(dbname:string):boolean;
var fi:file of byte;
    i:integer;
    by:byte;
begin
  AssignFile(FI,dbname);
  Reset(FI);
  result := false;
  // Read file
  I := 0;
  Repeat
    If not Eof(FI) then
    Begin
      Read(FI,By);
      Inc(I);
      if I=$15 then
      begin
        result := by&lt;&gt;1;
        break;
      end;
    End;
  Until  Eof(FI);
  closefile(fi);
end;
procedure ClearRelations(dbname,pwd:string);
var db:database;
    dbEngine:_dbengine;
    tempname:string;
    i:integer;
begin
  if pwd &lt;&gt;'' then
    pwd := ';pwd='+pwd;
  dbengine := CreateComObject(dao2000.CLASS_DBEngine) as _DBEngine;
  db := dbengine.OpenDatabase(dbname,dbDriverNoPrompt,false,pwd);
  for i:=db.Relations.Count -1 downto 0 do db.Relations.Delete(db.Relations.Item[i].Name);
end;

function CreateMdb(dbname,pwd:string):boolean;
var dbengine:_dbEngine;
begin
  result := true;
  try
  dbengine := CreateComObject(CLASS_DBEngine) as _DBEngine;
  dbengine.CreateDatabase(dbname,';pwd='+pwd,dbVersion30);
  except
    result := false;
  end;
end;

function ConnectAdo(adoconnection:TadoConnection;dbName,pwd:string):boolean;
var s:string;
begin
  result := false;
  s:='Provider=Microsoft.Jet.OLEDB.4.0;';
  s:=s+'User ID=Admin;';
  s:=s+'Data Source='+dbName+';';
  s:=s+'Mode=Share Deny None;';
  s:=s+'Jet OLEDB:Database Password="'+pwd+'";';
  try
  adoconnection.connected := false;
  adoconnection.connectionstring := s;
  adoconnection.connected := true;
  except
  end;
  result := adoConnection.connected;
end;

procedure CompactMdbDatabase(srcDbname,dstDbname,oldpwd,newpwd:string;bAccess97:boolean=true);
var idbEngine:_dbEngine;
begin
  if oldpwd &lt;&gt;'' then oldpwd := ';pwd='+oldpwd;
  if newpwd &lt;&gt;'' then newpwd := ';pwd='+newpwd;
  idbengine := CreateComObject(dao2000.CLASS_DBEngine) as _DBEngine;
  idbEngine.CompactDatabase(srcDbname,dstDbname,newpwd,dbVersion40,oldpwd);
end;

function GetWinTempFile:string;
var fn,pn:array[0..MAX_Path-1]of char;
begin
  getTempPath(MAX_PATH,pn);
  gettempfilename(pn,'TEMP',999,fn);
  result := fn;
end;

procedure changeMdbPwd(dbname,oldpwd,newpwd:string;bAccess97:boolean=true);
var db:database;
    dbEngine:_dbengine;
    tempname:string;
begin
    if (newpwd&lt;&gt;'') and (oldpwd &lt;&gt;'')then
    begin
      dbengine := CreateComObject(dao2000.CLASS_DBEngine) as _DBEngine;
      if oldpwd &lt;&gt;'' then
        db := dbengine.OpenDatabase(dbname,dbDriverNoPrompt,false,';pwd='+oldpwd)
      else
        db := dbengine.OpenDatabase(dbname,dbDriverNoPrompt,false,'');
      db.NewPassword(oldpwd,widestring(newpwd));
      db.Close;
    end else
    begin
      tempname := changefileext(getwintempfile,'.mdb');
      compactmdbDatabase(dbname,tempname,oldpwd,newpwd,false);
      copyfile(pchar(tempname),pchar(dbname),false);
      deletefile(tempname);
    end;
end;

procedure clearLinkTables(dbname,pwd:string);
var engine : _dbengine;
    dbs:database;
    i:Integer;
    tdtest,tdfloop:TableDef;
    strtb,strConnect :string;
    tdfLinked:tableDef;
begin
  engine := createcomobject(CLASS_DBEngine) as _dbengine;
  dbs := engine.OpenDatabase(dbname,dbDriverNoPrompt,false,';name=dbs;pwd='+pwd);

  for i := dbs.TableDefs.Count-1 downto 0 do
  begin
    tdfloop := dbs.TableDefs.Item[i];
      If ((tdfloop.Attributes And dbAttachedTable) &lt;&gt; 0) Or
            ((tdfloop.Attributes And dbAttachExclusive) &lt;&gt; 0) Or
            ((tdfloop.Attributes And dbAttachSavePWD) &lt;&gt; 0) Then
        dbs.TableDefs.Delete(tdfloop.Name)
  end;
end;

//link tables between databases
procedure connectx(srcName, srcPwd, dstName, dstPwd,suffix: String);
var engine : _dbengine;
    dbsSrc, dbsDst:database;
    i,j:Integer;
    tdtest,tdfloop:TableDef;
    strtb,strConnect :string;
    tdfLinked:tableDef;
begin
  engine := createcomobject(CLASS_DBEngine) as _dbengine;
  dbssrc := engine.OpenDatabase(srcname,dbDriverNoPrompt,false,';name=dbsrc;pwd='+srcpwd);
  dbsDst := engine.OpenDatabase(dstname,dbDriverNoPrompt,false,';name=dbdst;pwd='+dstpwd);
  for i := dbsDst.TableDefs.Count-1 downto 0 do
  begin
    tdfloop := dbsDst.TableDefs.Item[i];
    If ((tdfloop.Attributes And dbAttachedTable) &lt;&gt; 0) Or
          ((tdfloop.Attributes And dbAttachExclusive) &lt;&gt; 0) Or
          ((tdfloop.Attributes And dbAttachSavePWD) &lt;&gt; 0) Then
      dbsDst.TableDefs.Delete(tdfloop.Name)
  end;

  for i:=0 to dbsSrc.TableDefs.count-1 do
  begin
    tdfloop := dbsSrc.tabledefs[i];
    If (tdfloop.Attributes And dbSystemObject) = 0 Then
    begin
      strtb := tdfloop.Name;
      for j:=0 to dbsDst.tabledefs.count-1 do
      begin
        tdTest := dbsDst.tableDefs.item[j];
        If tdTest.Name = strtb Then
        begin
          If Not (
           ((tdTest.Attributes and dbAttachedTable) &lt;&gt; 0) Or
           ((tdTest.Attributes And dbAttachExclusive) &lt;&gt; 0) Or
           ((tdTest.Attributes And dbAttachSavePWD) &lt;&gt; 0)) Then
              strtb := strtb + suffix
          Else
          begin
            dbsDst.TableDefs.Delete( strtb);
          end;
        end;
      end;
      strConnect := ';DATABASE='+ srcName + ';pwd=' + srcPwd;
      tdfLinked := dbsDst.CreateTableDef(strtb,0,tdfLoop.name, strConnect);
      dbsDst.TableDefs.Append(tdfLinked);
    end;
  end;
end;

end.

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unit mdbUtils;

interface

uses windows,classes,sysutils,dao2000, comobj,

adodb{$ifdef ver140},variants{$endif},dialogs;

type

TFieldRec=record

fieldname:string;

fieldType,fieldSize:integer;

Required:boolean;

DefaultValue:olevariant;

ForeignName:string;

end;

TFieldRecArray=Array of TFieldRec;

TrelationRec=record

name,table,foreignTable:string;

Attributes:integer;

fields:TfieldRecArray;

end;

TRelationArray=array of TrelationRec;

TindexRec=record

name:string;

primary,unique,Required:boolean;

fields:TfieldRecArray;

end;

TIndexRecArray=array of TIndexRec;

TParamRec=record

value :olevariant;

type_:smallint;

Direction:smallint;

name : widestring;

end;

TparamRecArray=array of TparamRec;

TqueryDef=record

name:string;

sql:string;

end;

TqueryDefArray=array of TqueryDef;

function GetWinTempFile:string;

procedure CompactMdbDatabase(srcDbname,dstDbname,oldpwd,newpwd:string;bAccess97:boolean=true);

procedure CompactMdbDatabaseX(Dbname,pwd:string);

procedure changeMdbPwd(dbname,oldpwd,newpwd:string;bAccess97:boolean=true);

procedure clearLinkTables(dbname,pwd:string);

procedure connectx(srcName, srcPwd, dstName, dstPwd,suffix: String);

function ConnectAdo(adoconnection:TadoConnection;dbName,pwd:string):boolean;

function CreateMdb(dbname,pwd:string):boolean;

function OpenDatabase(dbname,pwd:string):database;

//relations

function GetRelations(dbname,pwd:string):TrelationArray;

procedure ClearRelations(dbname,pwd:string);

procedure CreateRelations(dbname,pwd:string;rs:TrelationArray);

//recordset

function createMDBTable(db:database;tbname:string;fldArray:TFieldRecArray;IdxArray:TIndexRecArray):tableDef;

procedure AlterMdbTable(db:database;tbname:string;fldArray:TfieldRecArray;IdxArray:TindexRecArray);

procedure renameMDBtable(db:database;srctbname,dstTbname:string);

procedure copyMdbTable(db:database;srcTdf,dstTdf:TableDef);

procedure dropmdbTable(db:database;tbname:string);

//querydefs

function getQuerydefs(dbname,pwd:string):TquerydefArray;

function clearQuerydefs(db:database):boolean;

function createQueryDef(db:database;qdf:TqueryDef):queryDef;

function createQueryDefs(db:database;qa:TquerydefArray):boolean;

function getAQuerydefsSQL(qryname,dbname,pwd:string):String;

implementation

function createQueryDefs(db:database;qa:TquerydefArray):boolean;

var i:integer;

begin

result := false;

for i:=0 to high(qa) do

begin

db.createQueryDef(qa[i].name,qa[i].sql);

end;

result := true;

end;

function createQueryDef(db:database;qdf:TqueryDef):queryDef;

var i:integer;

begin

result := nil;

result := db.CreateQueryDef(qdf.name,qdf.sql);

end;

function clearQuerydefs(db:database):boolean;

var i:integer;

begin

for i:= db.QueryDefs.count -1 downto 0 do

begin

db.querydefs.Delete(db.querydefs[i].Name);

end;

db.QueryDefs.Refresh;

end;

function getQuerydefs(dbname,pwd:string):TquerydefArray;

var db:database;

i,j:integer;

begin

db := opendatabase(dbname,pwd);

setlength(result,db.querydefs.count);

for i:=0 to db.QueryDefs.count-1 do

begin

result[i].name := db.QueryDefs[i].Name;

result[i].sql := db.QueryDefs[i].sql;

end;

function getAQuerydefsSQL(qryname,dbname,pwd:string):String;

var db:database;

i,j:integer;

found:Boolean;

begin

result:='';

found:=false;

db := opendatabase(dbname,pwd);

setlength(result,db.querydefs.count);

I:=0;

While (not found) and (i<= db.QueryDefs.count-1) do

begin

if (uppercase(db.QueryDefs[i].Name)=upperCase(qryname)) then result:= db.QueryDefs[i].sql;

Inc(i);

end;

procedure dropmdbTable(db:database;tbname:string);

begin

db.TableDefs.Delete(tbname);

db.TableDefs.Refresh;

end;

procedure copyMdbTable(db:database;srcTdf,dstTdf:TableDef);

const

sqlstr='insert into %s select %s from %s';

var s:string;

i:integer;

begin

s := '';

for i:=0 to dstTdf.Fields.Count -1 do

begin

try

if assigned(srcTdf.fields[dstTdf.fields[i].name]) then

begin

if s<>'' then s := s +',';

s := s +dstTdf.fields[i].Name;

end;

except

end;

if s<>'' then

db.Execute(format(sqlstr,[dsttdf.name,s,srctdf.name]),DbSQLPassThrough);

end;

procedure renameMDbtable(db:database;srctbname,dstTbname:string);

var tdf:tabledef;

begin

tdf := db.TableDefs[srctbname];

if assigned(tdf) then

begin

tdf.Set_Name(dstTbname);

db.TableDefs.Refresh;

end;

procedure AlterMdbTable(db:database;tbname:string;fldArray:TfieldRecArray;IdxArray:TindexRecArray);

var

tdfold,tdfnew:tabledef;

fld:field;

idx : _index;

i ,j : integer;

bfound:boolean;

begin

tdfold := db.TableDefs[tbname];

if not assigned(tdfold) then exit;

tdfnew := createmdbTable(db,'temp2002xh',fldArray,idxArray);

copymdbTable(db,tdfold,tdfnew);

dropmdbTable(db,tbname);

renameMdbTable(db,'temp2002xh',tbname);

end;

function createMDBTable(db:database;tbname:string;fldArray:TFieldRecArray;IdxArray:TIndexRecArray):tableDef;

var

tb : tabledef;

fld : field;

idx : _index;

i ,j : integer;

begin

tb := db.CreateTableDef(tbname,0,'','');

for i:=0 to high(fldArray) do

begin

fld := tb.CreateField(fldarray[i].fieldname,fldarray[i].fieldType,fldArray[i].fieldSize);

fld.Set_Required(fldArray[i].Required);

fld.Set_DefaultValue(fldArray[i].DefaultValue);

tb.Fields.Append(fld);

end;

for i:=0 to high(idxArray) do

begin

idx := tb.CreateIndex(idxArray[i].name);

idx.Set_Primary(idxArray[i].primary );

idx.Set_Unique(idxArray[i].unique);

idx.Set_Required(idxArray[i].Required);

for j:=0 to high(idxArray[i].fields) do

begin

fld := idx.CreateField(idxArray[i].fields[j].fieldname,idxArray[i].fields[j].fieldType,idxArray[i].fields[j].fieldSize);

idx.Fields.append(fld);

end;

tb.Indexes.Append(idx);

end;

db.TableDefs.Append(tb);

result := tb;

end;

procedure CompactMdbDatabaseX(Dbname,pwd:string);

var tmpdb:string;

begin

tmpdb := getWinTempfile;

tmpDb := changefileExt(tmpdb,'.mdb');

compactMdbDatabase(dbname,tmpdb,pwd,'',false);

if fileExists(tmpdb) then

begin

copyfile(pchar(tmpdb),pchar(dbname),false);

deletefile(tmpdb);

end;

procedure CreateRelations(dbname,pwd:string;rs:TrelationArray);

var db:database;

i,j : integer;

fld:field;

r:relation;

begin

db := opendatabase(dbname,pwd);

for i:= 0 to high(rs) do

begin

r := db.CreateRelation(rs[i].name,rs[i].table,rs[i].foreignTable,rs[i].Attributes);

for j:= 0 to high(rs[i].fields) do

begin

fld := r.CreateField(rs[i].fields[j].fieldname,rs[i].fields[j].fieldType,rs[i].fields[j].fieldSize);

fld.Set_ForeignName(rs[i].fields[j].foreignName);

r.Fields.Append(fld);

end;

db.Relations.Append(r);

end;

function OpenDatabase(dbname,pwd:string):database;

var db:database;

dbEngine:_dbengine;

begin

if pwd <>'' then

pwd := ';pwd='+pwd;

dbengine := CreateComObject(dao2000.CLASS_DBEngine) as _DBEngine;

db := dbengine.OpenDatabase(dbname,dbDriverNoPrompt,True,pwd);

result := db;

end;

function GetRelations(dbname,pwd:string):TrelationArray;

var db:database;

i,j:integer;

r:relation;

tdf:tabledef;

fn:string;

fld:field;

begin

db := opendatabase(dbname,pwd);

setlength(result,db.Relations.Count);

for i:=0 to db.Relations.Count -1 do

begin

r :=db.Relations.Item[i];

result[i].name := r.name;

result[i].table := r.table;

tdf := db.TableDefs[r.table];

result[i].foreignTable := r.ForeignTable;

result[i].Attributes := r.Attributes;

setlength(result[i].fields,r.Fields.Count);

for j:=0 to r.fields.Count -1 do

begin

result[i].Fields[j].fieldname := r.fields[j].Name;

fn := r.fields[j].Name;

fld := tdf.Fields[fn];

result[i].fields[j].fieldSize := fld.Size;

result[i].fields[j].fieldType := fld.Type_;

try

result[i].fields[j].foreignName := r.fields[j].ForeignName;

except

showmessage('error');

end;

function isAccess97(dbname:string):boolean;

var fi:file of byte;

i:integer;

by:byte;

begin

AssignFile(FI,dbname);

Reset(FI);

result := false;

// Read file

I := 0;

Repeat

If not Eof(FI) then

Begin

Read(FI,By);

Inc(I);

if I=$15 then

begin

result := by<>1;

break;

end;

End;

Until Eof(FI);

closefile(fi);

end;

procedure ClearRelations(dbname,pwd:string);

var db:database;

dbEngine:_dbengine;

tempname:string;

i:integer;

begin

if pwd <>'' then

pwd := ';pwd='+pwd;

dbengine := CreateComObject(dao2000.CLASS_DBEngine) as _DBEngine;

db := dbengine.OpenDatabase(dbname,dbDriverNoPrompt,false,pwd);

for i:=db.Relations.Count -1 downto 0 do db.Relations.Delete(db.Relations.Item[i].Name);

end;

function CreateMdb(dbname,pwd:string):boolean;

var dbengine:_dbEngine;

begin

result := true;

try

dbengine := CreateComObject(CLASS_DBEngine) as _DBEngine;

dbengine.CreateDatabase(dbname,';pwd='+pwd,dbVersion30);

except

result := false;

end;

function ConnectAdo(adoconnection:TadoConnection;dbName,pwd:string):boolean;

var s:string;

begin

result := false;

s:='Provider=Microsoft.Jet.OLEDB.4.0;';

s:=s+'User ID=Admin;';

s:=s+'Data Source='+dbName+';';

s:=s+'Mode=Share Deny None;';

s:=s+'Jet OLEDB:Database Password="'+pwd+'";';

try

adoconnection.connected := false;

adoconnection.connectionstring := s;

adoconnection.connected := true;

except

end;

result := adoConnection.connected;

end;

procedure CompactMdbDatabase(srcDbname,dstDbname,oldpwd,newpwd:string;bAccess97:boolean=true);

var idbEngine:_dbEngine;

begin

if oldpwd <>'' then oldpwd := ';pwd='+oldpwd;

if newpwd <>'' then newpwd := ';pwd='+newpwd;

idbengine := CreateComObject(dao2000.CLASS_DBEngine) as _DBEngine;

idbEngine.CompactDatabase(srcDbname,dstDbname,newpwd,dbVersion40,oldpwd);

end;

function GetWinTempFile:string;

var fn,pn:array[0..MAX_Path-1]of char;

begin

getTempPath(MAX_PATH,pn);

gettempfilename(pn,'TEMP',999,fn);

result := fn;

end;

procedure changeMdbPwd(dbname,oldpwd,newpwd:string;bAccess97:boolean=true);

var db:database;

dbEngine:_dbengine;

tempname:string;

begin

if (newpwd<>'') and (oldpwd <>'')then

begin

dbengine := CreateComObject(dao2000.CLASS_DBEngine) as _DBEngine;

if oldpwd <>'' then

db := dbengine.OpenDatabase(dbname,dbDriverNoPrompt,false,';pwd='+oldpwd)

else

db := dbengine.OpenDatabase(dbname,dbDriverNoPrompt,false,'');

db.NewPassword(oldpwd,widestring(newpwd));

db.Close;

end else

begin

tempname := changefileext(getwintempfile,'.mdb');

compactmdbDatabase(dbname,tempname,oldpwd,newpwd,false);

copyfile(pchar(tempname),pchar(dbname),false);

deletefile(tempname);

end;

procedure clearLinkTables(dbname,pwd:string);

var engine : _dbengine;

dbs:database;

i:Integer;

tdtest,tdfloop:TableDef;

strtb,strConnect :string;

tdfLinked:tableDef;

begin

engine := createcomobject(CLASS_DBEngine) as _dbengine;

dbs := engine.OpenDatabase(dbname,dbDriverNoPrompt,false,';name=dbs;pwd='+pwd);

for i := dbs.TableDefs.Count-1 downto 0 do

begin

tdfloop := dbs.TableDefs.Item[i];

If ((tdfloop.Attributes And dbAttachedTable) <> 0) Or

((tdfloop.Attributes And dbAttachExclusive) <> 0) Or

((tdfloop.Attributes And dbAttachSavePWD) <> 0) Then

dbs.TableDefs.Delete(tdfloop.Name)

end;

//link tables between databases

procedure connectx(srcName, srcPwd, dstName, dstPwd,suffix: String);

var engine : _dbengine;

dbsSrc, dbsDst:database;

i,j:Integer;

tdtest,tdfloop:TableDef;

strtb,strConnect :string;

tdfLinked:tableDef;

begin

engine := createcomobject(CLASS_DBEngine) as _dbengine;

dbssrc := engine.OpenDatabase(srcname,dbDriverNoPrompt,false,';name=dbsrc;pwd='+srcpwd);

dbsDst := engine.OpenDatabase(dstname,dbDriverNoPrompt,false,';name=dbdst;pwd='+dstpwd);

for i := dbsDst.TableDefs.Count-1 downto 0 do

begin

tdfloop := dbsDst.TableDefs.Item[i];

If ((tdfloop.Attributes And dbAttachedTable) <> 0) Or

((tdfloop.Attributes And dbAttachExclusive) <> 0) Or

((tdfloop.Attributes And dbAttachSavePWD) <> 0) Then

dbsDst.TableDefs.Delete(tdfloop.Name)

end;

for i:=0 to dbsSrc.TableDefs.count-1 do

begin

tdfloop := dbsSrc.tabledefs[i];

If (tdfloop.Attributes And dbSystemObject) = 0 Then

begin

strtb := tdfloop.Name;

for j:=0 to dbsDst.tabledefs.count-1 do

begin

tdTest := dbsDst.tableDefs.item[j];

If tdTest.Name = strtb Then

begin

If Not (

((tdTest.Attributes and dbAttachedTable) <> 0) Or

((tdTest.Attributes And dbAttachExclusive) <> 0) Or

((tdTest.Attributes And dbAttachSavePWD) <> 0)) Then

strtb := strtb + suffix

Else

begin

dbsDst.TableDefs.Delete( strtb);

end;

strConnect := ';DATABASE='+ srcName + ';pwd=' + srcPwd;

tdfLinked := dbsDst.CreateTableDef(strtb,0,tdfLoop.name, strConnect);

dbsDst.TableDefs.Append(tdfLinked);

end;

end.

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MsAccess administration from Delphi