oracle.h

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#ifndef ORACLE_H
#define ORACLE_H
 
#include <occiControl.h>
 
namespace Oracle {
 
class Nexus;
class SQL;
 
class OracleEnv
{ friend class Nexus;
  public:
    OracleEnv(bool=false);
    OracleEnv(const OracleEnv &)=delete;
    const OracleEnv & operator = (const OracleEnv &)=delete;
    ~OracleEnv(void);
    oracle::occi::Environment & operator() (void) { return *m_env; }
    
  protected:
    oracle::occi::Environment *m_env; 
};
 
 
class Nexus
{ friend class SQL;
  friend class OracleEnv;
  public:
    explicit Nexus(OracleEnv &, const char *, const char *, const char *);
    Nexus(const Nexus &)=delete;
    const Nexus & operator = (const Nexus &)=delete;
    ~Nexus(void);
    oracle::occi::Connection & operator () (void) { return *m_conn; }
    
  protected:
    OracleEnv &m_oe;                   
    oracle::occi::Connection *m_conn;  
};
 
 
class SQL
{ friend class Nexus;
  friend class Results;
  public:
    explicit SQL(Nexus &, const char * = 0);
    SQL(const SQL &)=delete;
    const SQL & operator = (const SQL &)=delete;
    ~SQL(void);
    oracle::occi::Statement & operator() (void) { return *m_stmt; }
    unsigned Modify(const char * = 0);
  
  protected:
    oracle::occi::Statement *m_stmt;  
    Nexus &m_nexus;                   
};
 
 
class Results
{ friend class SQL;
  public:
    explicit Results(SQL &, const char * = 0);
    Results(const Results &)=delete;
    const Results & operator = (const Results &)=delete;
    ~Results(void);
    oracle::occi::ResultSet & operator() (void) { return *m_rs; }
    
  protected:
    oracle::occi::ResultSet *m_rs;  
    SQL &m_sql;                     
};
 
}
 
#endif