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DbiCascader::Lock Class Reference

List of all members.

Public Member Functions

 Lock (DbiStatement *stmtDB, const string &seqnoTable, const string &dataTable)
 ~Lock ()
Bool_t IsLocked () const

Private Member Functions

void SetLock (Bool_t setting=kTRUE)

Private Attributes

DbiStatement * fStmt
string fSeqnoTableName
string fDataTableName
Bool_t fLocked

Constructor & Destructor Documentation

DbiCascader::Lock::Lock (  DbiStatement *  stmtDB,
const string &  seqnoTable,
const string &  dataTable
) 
 

Definition at line 546 of file DbiCascader.cxx.

References LEA_CTOR_NM, MAXMSG, and SetLock().

00546                                                                                              :
00547 fStmt(stmtDB),
00548 fSeqnoTableName(seqnoTable),
00549 fDataTableName(dataTable),
00550 fLocked(kFALSE)
00551 {
00552 //
00553 //
00554 //  Purpose:  Ctor: Create a lock on a table accessed via connection.
00555 //            (will be released by dtor)
00556 //  Arguments: 
00557 //          stmtDB    in  DbiStatement (given to Lock).
00558   
00559   LEA_CTOR_NM("DbiCascader::Lock",this);
00560 
00561   if ( ! fStmt ) {
00562     MAXMSG("Dbi",Msg::kError,20) << "Cannot obtain statment to set lock" << endl;
00563     return;
00564   }
00565 
00566   this->SetLock(kTRUE);
00567 
00568 }
//.....................................................................

DbiCascader::Lock::~Lock (   ) 
 

Definition at line 571 of file DbiCascader.cxx.

References fStmt, LEA_DTOR_NM, and SetLock().

00571                        {
00572 //
00573 //
00574 //  Purpose:  Dtor: Clear lock
00575 
00576   LEA_DTOR_NM("DbiCascader::Lock",this);
00577 
00578   this->SetLock(kFALSE);
00579   delete fStmt;
00580   fStmt = 0; 
00581 
00582 }

Member Function Documentation

Bool_t DbiCascader::Lock::IsLocked (   )  const [inline]
 

Definition at line 139 of file DbiCascader.h.

00139 { return fLocked; }

void DbiCascader::Lock::SetLock (  Bool_t  setting = kTRUE  )  [private]
 

Definition at line 586 of file DbiCascader.cxx.

References DbiStatement::ExecuteUpdate(), fDataTableName, fLocked, fSeqnoTableName, fStmt, DbiStatement::GetDBType(), DbiStatement::GetExceptionLog(), DbiExceptionLog::IsEmpty(), MSG, and DbiStatement::PrintExceptions().

Referenced by Lock(), and ~Lock().

00586                                              {
00587 
00588 //
00589 //
00590 //  Purpose:  Set or clear lock.
00591 //
00592 //  Arguments: 
00593 //    setting      in    Required setting of lock. [default kTRUE]
00594 
00595 //  Program Notes:-
00596 //  =============
00597 
00598 //  No-op unless connect to MySQL DB, in which case it uses the LOCK TABLES command.
00599 
00600   if ( setting == fLocked || ! fStmt ) return;
00601 
00602   if ( fStmt->GetDBType() != Dbi::kMySQL ) { 
00603     fLocked = setting;
00604     return;
00605   }
00606 
00607   string sql;
00608 
00609   if ( setting ) {
00610     sql = "LOCK TABLES ";
00611     sql += fSeqnoTableName + " WRITE";
00612     if ( fDataTableName != "" ) sql += ", " + fDataTableName  + "VLD WRITE";
00613   }
00614   else {
00615     sql = "UNLOCK TABLES;";
00616   }
00617   MSG("Dbi",Msg::kSynopsis) << "Lock requested: " << setting 
00618                          << " issuing lock command: " << sql << endl;
00619   fStmt->ExecuteUpdate(sql.c_str());
00620   if ( fStmt->GetExceptionLog().IsEmpty() ) fLocked = setting;
00621   fStmt->PrintExceptions();
00622 
00623 }

Member Data Documentation

string DbiCascader::Lock::fDataTableName [private]
 

Definition at line 147 of file DbiCascader.h.

Referenced by SetLock().

Bool_t DbiCascader::Lock::fLocked [private]
 

Definition at line 148 of file DbiCascader.h.

Referenced by SetLock().

string DbiCascader::Lock::fSeqnoTableName [private]
 

Definition at line 146 of file DbiCascader.h.

Referenced by SetLock().

DbiStatement* DbiCascader::Lock::fStmt [private]
 

Definition at line 145 of file DbiCascader.h.

Referenced by SetLock(), and ~Lock().

The documentation for this class was generated from the following files:
Generated on Mon Feb 15 11:09:02 2010 for loon by  doxygen 1.3.9.1