TTreeSQL.cxx

Go to the documentation of this file.

// @(#)root/tree:$Id$
// Author: Philippe Canal and al. 08/2004
 
/*************************************************************************
 * Copyright (C) 1995-2000, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/
 
/** \class TTreeSQL
\ingroup tree
 
 A TTree object is a list of TBranch.
  To Create a TTree object one must:
   - Create the TTree header via the TTree constructor
   - Call the TBranch constructor for every branch.
 
  To Fill this object, use member function Fill with no parameters.
    The Fill function loops on all defined TBranch.
 
TTreeSQL is the TTree implementation interfacing with an SQL
database
 
*/
 
#include <vector>
#include <map>
#include <cstdlib>
 
#include "TString.h"
#include "TError.h"
#include "TLeaf.h"
#include "TBranch.h"
#include "TList.h"
 
#include "TSQLRow.h"
#include "TSQLResult.h"
#include "TSQLServer.h"
#include "TSQLTableInfo.h"
#include "TSQLColumnInfo.h"
 
#include "TTreeSQL.h"
#include "TBasketSQL.h"
 
ClassImp(TTreeSQL);
 
////////////////////////////////////////////////////////////////////////////////
/// Constructor with an explicit TSQLServer
 
TTreeSQL::TTreeSQL(TSQLServer *server, TString DB, const TString& table) :
   TTree(table.Data(), "Database read from table: " + table, 0), fDB(DB),
   fTable(table.Data()),
   fResult(nullptr), fRow(nullptr),
   fServer(server),
   fBranchChecked(false),
   fTableInfo(nullptr)
{
   fCurrentEntry = -1;
   fQuery = TString("Select * from " + fTable);
   fEntries = 0;
 
   if (fServer==nullptr) {
      Error("TTreeSQL","No TSQLServer specified");
      return;
   }
   if (CheckTable(fTable.Data())) {
      Init();
   }
}
 
////////////////////////////////////////////////////////////////////////////////
/// Not implemented yet
 
TBranch* TTreeSQL::BranchImp(const char *, const char *,
                             TClass *, void *, Int_t ,
                             Int_t )
{
   Fatal("BranchImp","Not implemented yet");
   return nullptr;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Not implemented yet
 
TBranch* TTreeSQL::BranchImp(const char *, TClass *,
                             void *, Int_t , Int_t )
{
   Fatal("BranchImp","Not implemented yet");
   return nullptr;
}
////////////////////////////////////////////////////////////////////////////////
/// Not implemented yet
 
Int_t TTreeSQL::Branch(TCollection *, Int_t,
                       Int_t, const char *)
{
   Fatal("Branch","Not implemented yet");
   return 0;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Not implemented yet
 
Int_t TTreeSQL::Branch(TList *, Int_t, Int_t)
{
   Fatal("Branch","Not implemented yet");
   return 0;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Not implemented yet
 
Int_t TTreeSQL::Branch(const char *, Int_t ,
                       Int_t)
{
   Fatal("Branch","Not implemented yet");
   return 0;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Not implemented yet
 
TBranch* TTreeSQL::Bronch(const char *, const char *, void *,
                          Int_t, Int_t)
{
   Fatal("Bronch","Not implemented yet");
   return nullptr;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Not implemented yet
 
TBranch* TTreeSQL::BranchOld(const char *, const char *,
                             void *, Int_t, Int_t)
{
   Fatal("BranchOld","Not implemented yet");
   return nullptr;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Not implemented yet
 
TBranch *TTreeSQL::Branch(const char *, const char *, void *,
                          Int_t, Int_t)
{
   Fatal("Branch","Not implemented yet");
   return nullptr;
}
 
///////////////////////////////////////////////////////////////////////////////
/// Create a branch
 
TBranch * TTreeSQL::Branch(const char *name, void *address,
                           const char *leaflist, Int_t bufsize)
{
   Int_t nb = fBranches.GetEntriesFast();
   TBranch *branch;
   TString brName;
 
   for (int i=0;i<nb;i++) {
      branch = (TBranch*)fBranches.UncheckedAt(i);
      brName = branch->GetName();
      if (brName.CompareTo(name) == 0) {
         // Now if the branch exists in db, root gives a warning and exit
         // Dealing with duplicate branch has been done, but not tested yet.
         // So if you want to allow duplicate branch, just comment Fatal() line and uncomment commented
         // below Fatal() line
 
         Fatal("Branch()", "Duplicate branch!!!");
 
         /* Commented. If uncommented, should comment Fatal line.
         // this is a duplicate branch. So reset data structure memory address and return.
         branch->SetAddress(address);
         return branch;
         */
      }
   }
 
   return TTree::Branch(name, address, leaflist, bufsize);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Check if the basket is properly setup
 
void TTreeSQL::CheckBasket(TBranch *branch)
{
   TBasketSQL* basket = (TBasketSQL *)branch->GetBasket(0);
 
   if (basket==nullptr) {
      basket = (TBasketSQL*)CreateBasket(branch);
      if (basket==nullptr) return;
      //++(branch->fNBaskets);
      branch->GetListOfBaskets()->AddAtAndExpand(basket,0);
   }
   TBuffer * buffer = basket->GetBufferRef();
 
   if(buffer == nullptr){
      std::vector<Int_t> *columns = GetColumnIndice(branch);
      if (columns) basket->CreateBuffer(branch->GetName(),"A", columns, branch, &fResult);
   }
 
   Int_t nb = branch->GetListOfBranches()->GetEntriesFast();
   for (int i=0;i<nb;i++) {
      TBranch * subbranch = (TBranch*)branch->GetListOfBranches()->UncheckedAt(i);
      if(subbranch) CheckBasket(subbranch);
   }
}
 
////////////////////////////////////////////////////////////////////////////////
/// Check if the table has a column corresponding the branch
/// and that the resultset are properly setup
 
bool TTreeSQL::CheckBranch(TBranch * tb)
{
   if (fServer==nullptr) {
      return false;
   }
   TString leafName;
   TLeaf *leaf;
   Int_t nl;
   TString str = "";
   TString typeName = "";
 
   if (!tb) return false;
 
   TBasketSQL *basket = (TBasketSQL *)tb->GetBasket(0);
   if (!basket) return false;
 
   TSQLResult *rs = basket->GetResultSet();
   if (!rs) {
      Error("CheckBranch","%s has basket but no resultset yet",tb->GetName());
      return false;
   }
 
   nl = tb->GetNleaves();
 
   for(int j=0;j<nl;j++) {
      leaf = (TLeaf*)tb->GetListOfLeaves()->UncheckedAt(j);
      typeName = leaf->GetTypeName();
      typeName = ConvertTypeName(leaf->GetTypeName());
      leafName = leaf->GetName();
      str = "";
      str = tb->GetName();
      str += "__";
      str += leafName;
 
      for (int i=0; i< rs->GetFieldCount(); ++i) {
         if (str.CompareTo(rs->GetFieldName(i),TString::kIgnoreCase) == 0) return true;
      }
      // We assume that if ONE of the leaf is in the table, then ALL the leaf are in
      // the table.
      // TODO: this assumption is harmful if user changes branch structure while keep its name
      CreateBranch(str, typeName);
   }
   return false;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Check the table exist in the database
 
bool TTreeSQL::CheckTable(const TString &table) const
{
   if (fServer==nullptr) return false;
   TSQLResult * tables = fServer->GetTables(fDB.Data(),table);
   if (!tables) return false;
   TSQLRow * row = nullptr;
   while( (row = tables->Next()) ) {
      if(table.CompareTo(row->GetField(0),TString::kIgnoreCase)==0){
         return true;
      }
   }
   // The table is a not a permanent table, let's see if it is a 'temporary' table
   Int_t before = gErrorIgnoreLevel;
   gErrorIgnoreLevel = kFatal;
   TSQLResult *res = fServer->GetColumns(fDB.Data(),table);
   if (res) {
      delete res;
      return true;
   }
   gErrorIgnoreLevel = before;
 
   return false;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Convert from ROOT typename to SQL typename
 
TString TTreeSQL::ConvertTypeName(const TString& typeName )
{
   TString tn = "";
 
   if(typeName == "Char_t"){
      tn = "TEXT";
   }
   else if(typeName == "Int_t") {
      tn = "INTEGER";
   }
   else if(typeName == "Short_t") {
      tn = "SMALLINT";
   }
   else if( typeName == "UShort_t") {
      tn = "SMALLINT UNSIGNED";
   }
   else if(typeName == "Float_t"){
      tn = "FLOAT";
   }
   else if(typeName == "Float16_t"){
      tn = "FLOAT";
   }
   else if(typeName == "Double_t"){
      tn = "DOUBLE";
   }
   else if(typeName == "Double32_t"){
      tn = "FLOAT";
   }
   else if(typeName == "UInt_t") {
      tn = "INT UNSIGNED";
   }
   else if( typeName == "Long_t") {
      tn = "INTEGER";
   }
   else if( typeName == "ULong_t") {
      tn = "INTEGER UNSIGNED";
   }
   else if( typeName == "Long64_t") {
      tn = "BIGINT";
   }
   else if( typeName == "ULong64_t") {
      tn = "BIGINT UNSIGNED";
   }
   else if( typeName == "Bool_t") {
      tn = "BOOL";
   }
   else if( typeName == "TString") {
      tn = "TEXT";
   }
 
   else {
      Error("ConvertTypeName","TypeName (%s) not found",typeName.Data());
      return "";
   }
 
   return tn;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Create a TBasketSQL
 
TBasket * TTreeSQL::CreateBasket(TBranch * tb)
{
   if (fServer==nullptr) {
      Error("CreateBasket","No TSQLServer specified");
      return nullptr;
   }
   std::vector<Int_t> *columnVec = GetColumnIndice(tb);
   if (columnVec) {
      return new TBasketSQL(tb->GetName(), tb->GetName(), tb,
                            &fResult, &fInsertQuery, columnVec, &fRow);
   } else {
      return nullptr;
   }
}
 
////////////////////////////////////////////////////////////////////////////////
/// Create the column(s) in the database that correspond to the branch/
 
void TTreeSQL::CreateBranch(const TString &branchName, const TString &typeName)
{
   if (fServer==nullptr) {
      Error("CreateBranch","No TSQLServer specified");
      return;
   }
   TString alterSQL = "";
   alterSQL = "";
   alterSQL = "ALTER TABLE ";
   alterSQL += fTable.Data();
   alterSQL += " ADD ";
   alterSQL += branchName.Data();
   alterSQL += " ";
   alterSQL += typeName;
   alterSQL += " ";
 
   fServer->Query(alterSQL);
}
 
////////////////////////////////////////////////////////////////////////////////
/// determine leaf description string
 
void TTreeSQL::CreateBranches()
{
   TList * columns = fTableInfo->GetColumns();
   if(!columns) return;
 
   TIter next(columns);
 
   TString branchName;
   TString type;
   TString leafName;
   TBranch * br = nullptr;
   TSQLColumnInfo * info;
   while ( (info = ((TSQLColumnInfo*) next()) ))
   {
      type = info->GetTypeName();
      branchName = info->GetName();
 
 
      Int_t pos;
      if ((pos=branchName.Index("__"))!=kNPOS) {
          leafName = branchName(pos+2,branchName.Length());
          branchName.Remove(pos);
      } else {
          leafName = branchName;
      }
 
      TString str;
      int i;
      unsigned ui;
      double d;
      float f;
 
      br = nullptr;
 
      if(type.CompareTo("varchar",TString::kIgnoreCase)==0 ||
         type.CompareTo("varchar2",TString::kIgnoreCase)==0 ||
         type.CompareTo("char",TString::kIgnoreCase)==0 ||
         type.CompareTo("longvarchar",TString::kIgnoreCase)==0 ||
         type.CompareTo("longvarbinary",TString::kIgnoreCase)==0 ||
         type.CompareTo("varbinary",TString::kIgnoreCase)==0 ||
         type.CompareTo("text",TString::kIgnoreCase )==0 ) {
         br = TTree::Branch(leafName,&str);
 
      }
      else if(type.CompareTo("int",TString::kIgnoreCase)==0 ){
         br = TTree::Branch(leafName,&i);
      }
 
      //Somehow it should be possible to special-case the time classes
      //but I think we'd need to create a new TSQLTime or something like that...
      else if( type.CompareTo("date",TString::kIgnoreCase)==0 ||
               type.CompareTo("time",TString::kIgnoreCase)==0 ||
               type.CompareTo("timestamp",TString::kIgnoreCase)==0 ||
               type.CompareTo("datetime",TString::kIgnoreCase)==0 ) {
         br = TTree::Branch(leafName,&str);
 
      }
 
      else if(type.CompareTo("bit",TString::kIgnoreCase)==0 ||
              type.CompareTo("tinyint",TString::kIgnoreCase)==0 ||
              type.CompareTo("smallint",TString::kIgnoreCase)==0 ) {
         br = TTree::Branch(leafName,&ui);
      }
 
      else if( type.CompareTo("decimal",TString::kIgnoreCase)==0 ||
               type.CompareTo("numeric",TString::kIgnoreCase)==0 ||
               type.CompareTo("double",TString::kIgnoreCase)==0 ||
               type.CompareTo("float",TString::kIgnoreCase)==0 )
      {
         br = TTree::Branch(leafName,&f);
      }
      else if( type.CompareTo("bigint",TString::kIgnoreCase)==0 ||
               type.CompareTo("real",TString::kIgnoreCase) == 0)
      {
         br = TTree::Branch(leafName,&d);
      }
 
      if (br == nullptr)
      {
         Error("CreateBranches", "Skipped %s", branchName.Data());
         continue;
      }
 
      br->ResetAddress();
 
      (br->GetBasketEntry())[0] = 0;
      (br->GetBasketEntry())[1] = fEntries;
      br->SetEntries(fEntries);
 
      //++(br->fNBaskets);
      br->GetListOfBaskets()->AddAtAndExpand(CreateBasket(br),0);
   }
}
 
////////////////////////////////////////////////////////////////////////////////
/// Create the database table corresponding to this TTree.
 
bool TTreeSQL::CreateTable(const TString &table)
{
   if (fServer==nullptr) {
      Error("CreateTable","No TSQLServer specified");
      return false;
   }
   Int_t i, j;
   TString branchName, leafName, typeName;
   TString createSQL, alterSQL, str;
   Int_t nb = fBranches.GetEntriesFast();
   Int_t nl = 0;
 
   TBranch *branch;
   TLeaf *leaf;
 
   for (i=0;i<nb;i++) {
      branch = (TBranch*)fBranches.UncheckedAt(i);
      branchName = branch->GetName();
      nl = branch->GetNleaves();
      for(j=0;j<nl;j++) {
         leaf = (TLeaf*)branch->GetListOfLeaves()->UncheckedAt(j);
         leafName = leaf->GetName();
         typeName = ConvertTypeName(leaf->GetTypeName());
         // length = leaf->GetLenStatic();
 
         if(i == 0 && j == 0) {
            createSQL = "";
            createSQL += "CREATE TABLE ";
            createSQL += table;
            createSQL += " (";
            createSQL += branchName;
            createSQL += "__";
            createSQL += leafName;
            createSQL += " ";
            createSQL += typeName;
            createSQL += " ";
            createSQL += ")";
 
            TSQLResult *sres = fServer->Query(createSQL.Data());
            if (!sres) {
               Error("CreateTable","May have failed");
               return false;
            }
         }
         else {
            str = "";
            str = branchName;
            str += "__";
            str += leafName;
            CreateBranch(str, typeName);
         } //else
      }  // inner for loop
   } // outer for loop
   // retrieve table to initialize fResult
   delete fResult;
   fResult = fServer->Query(fQuery.Data());
   return (fResult!=nullptr);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Initialization routine
 
void TTreeSQL::Init()
{
   fCurrentEntry = -1;
 
   GetEntries();
 
   delete fResult;
   fResult = fServer->Query(fQuery.Data());
   if(!fResult) return;
 
   if (fDB != "") {
      fServer->SelectDataBase(fDB);
   }
   fTableInfo = fServer->GetTableInfo(fTable);
   CreateBranches();
}
 
////////////////////////////////////////////////////////////////////////////////
/// Copy the information from the user object to the TTree
 
Int_t TTreeSQL::Fill()
{
   Int_t nb = fBranches.GetEntriesFast();
   TString typeName;
   TBranch *branch;
 
   if (fServer==nullptr) return 0;
 
   if(!CheckTable(fTable.Data())) {
      if (!CreateTable(fTable.Data())) {
         return -1;
      }
   }
 
   PrepEntry(fEntries);
 
   for (int i=0;i<nb;i++) {
      branch = (TBranch*)fBranches.UncheckedAt(i);
      CheckBasket(branch);
   }
 
   if (!fBranchChecked) {
      for(int i=0;i<nb;i++) {
         branch = (TBranch*)fBranches.UncheckedAt(i);
         if (!CheckBranch(branch)) {
            Error("Fill","CheckBranch for %s failed",branch->GetName());
         }
      }
      fBranchChecked = true;
   }
   ResetQuery();
 
   TTree::Fill();
 
   if (fInsertQuery[fInsertQuery.Length()-1]!='(') {
      fInsertQuery.Remove(fInsertQuery.Length()-1);
      fInsertQuery += ")";
      TSQLResult *res = fServer?fServer->Query(fInsertQuery):nullptr;
 
      if (res) {
         return res->GetRowCount();
      }
   }
   return -1;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Return a vector of columns index corresponding to the
/// current SQL table and the branch given as argument
/// Returns 0 if no columns indices is found
/// Otherwise returns a pointer to a vector to be deleted by the caller
 
std::vector<Int_t> *TTreeSQL::GetColumnIndice(TBranch *branch)
{
   if (!CheckTable(fTable)) return nullptr;
 
   std::vector<Int_t> *columns = new std::vector<Int_t>;
 
   Int_t nl = branch->GetNleaves();
 
   std::vector<TString> names;
 
   TList *col_list = fTableInfo->GetColumns();
   if (col_list==nullptr) {
      delete columns;
      return nullptr;
   }
 
   std::pair<TString,Int_t> value;
 
   TIter next(col_list);
   TSQLColumnInfo * cinfo;
   int rows = 0;
   while ((cinfo = (TSQLColumnInfo*) next())) {
      names.push_back( cinfo->GetName() );
      rows++;
   }
 
   for(int j=0;j<nl;j++) {
 
      Int_t col = -1;
      TLeaf *leaf = (TLeaf*)branch->GetListOfLeaves()->UncheckedAt(j);
      TString leafName = leaf->GetName();
      TString str;
 
      str = "";
      str = branch->GetName();
      str += "__";
      str += leafName;
      for (Int_t i=0;i<rows;++i) {
         if (str.CompareTo(names[i],TString::kIgnoreCase)==0) {
            col = i;
            break;
         }
      }
      if (col<0) {
         str = leafName;
         for (Int_t i=0;i<rows;++i) {
            if (str.CompareTo(names[i],TString::kIgnoreCase)==0) {
               col = i;
               break;
            }
         }
      }
      if(col>=0){
         columns->push_back(col);
      } else Error("GetColumnIndice","Error finding column %d %s",j,str.Data());
   }
   if (columns->empty()) {
      delete columns;
      return nullptr;
   } else
      return columns;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Get the number of rows in the database
 
Long64_t  TTreeSQL::GetEntries() const
{
   if (fServer==nullptr) return GetEntriesFast();
   if (!CheckTable(fTable.Data())) return 0;
 
   TTreeSQL* thisvar = const_cast<TTreeSQL*>(this);
 
   // What if the user already started to call GetEntry
   // What about the initial value of fEntries is it really 0?
 
   TString counting = "select count(*) from " + fTable;
   TSQLResult *count = fServer->Query(counting);
 
   if (count==nullptr) {
      thisvar->fEntries = 0;
   } else {
      TSQLRow * row = count->Next();
      if (row) {
         TString val = row->GetField(0);
         Long_t ret;
         sscanf(val.Data(), "%ld",&(ret) );
         thisvar->fEntries = ret;
      } else {
         thisvar->fEntries = 0;
      }
   }
   return fEntries;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Return the number of entries as of the last check.
/// Use GetEntries for a more accurate count.
 
Long64_t  TTreeSQL::GetEntriesFast()    const
{
   return fEntries;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Load the data for the entry from the database.
 
Int_t TTreeSQL::GetEntry(Long64_t entry, Int_t getall)
{
   if (PrepEntry(entry)>=0) return TTree::GetEntry(entry,getall);
   else return -1;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Setup the tree to the load the specified entry.
 
Long64_t TTreeSQL::LoadTree(Long64_t entry)
{
   fReadEntry = entry;
   return PrepEntry(entry);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Make sure the server and result set are setup for the requested entry
 
Long64_t TTreeSQL::PrepEntry(Long64_t entry)
{
   if (entry < 0 || entry >= fEntries || fServer==nullptr) return 0;
   fReadEntry = entry;
 
   if(entry == fCurrentEntry) return entry;
 
   if(entry < fCurrentEntry || fResult==nullptr){
      delete fResult;
      fResult = fServer->Query(fQuery.Data());
      fCurrentEntry = -1;
   }
 
   bool reset = false;
   while ( fResult && fCurrentEntry < entry ) {
      ++fCurrentEntry;
      delete fRow;
      fRow = fResult->Next();
      if (fRow==nullptr && !reset) {
         delete fResult;
         fResult = fServer->Query(fQuery.Data());
         fCurrentEntry = -1;
         reset = true;
      }
   }
   if (fRow==nullptr) return -1;
   return entry;
}
 
//______________________________________________________________________________
// void TTreeSQL::LoadNumberEntries()
// {
//    R__ASSERT(0);
 
//    fResult =    fServer->Query(fQuery.Data());
//    fEntries=0;
 
//    while(fResult->Next()){
//       fEntries++;
//    }
//    fResult =    fServer->Query(fQuery.Data());
// }
 
////////////////////////////////////////////////////////////////////////////////
///  Refresh contents of this Tree and its branches from the current
///  Tree status in the database
///  One can call this function in case the Tree on its file is being
///  updated by another process
 
void TTreeSQL::Refresh()
{
   // Note : something to be done?
   GetEntries(); // Re-load the number of entries
   fCurrentEntry = -1;
   delete fResult; fResult = nullptr;
   delete fRow; fRow = nullptr;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Reset the internal query
 
void TTreeSQL::ResetQuery()
{
   fInsertQuery = "INSERT INTO " + fTable + " VALUES (";
}
 
 
////////////////////////////////////////////////////////////////////////////////
// Destructor
 
TTreeSQL::~TTreeSQL()
{
   delete fTableInfo;
   delete fResult;
   delete fRow;
}