/**
 * occidml - To exhibit the insertion, Selection, updating and deletion of 
 *            a row through OCCI.
 *
 * Description
 *   Create a program which has insert, select, update & delete as operations. 
 *   Perform all these operations using OCCI interface.
 */

#include <iostream.h>
#include <occi.h>
using namespace oracle::occi;
using namespace std;

class  occidml
{
  private:

  Environment *env;
  Connection *conn;
  Statement *stmt;
  public:

  occidml (string user, string passwd, string db)
  {
    env = Environment::createEnvironment (Environment::DEFAULT);
    conn = env->createConnection (user, passwd, db);
  }

  ~occidml ()
  {
    env->terminateConnection (conn);
    Environment::terminateEnvironment (env);
  }

  /**
   * Insertion of a row with dynamic binding, PreparedStatement functionality.
   */
  void insertBind (int c1, string c2)
  {
    string sqlStmt = "INSERT INTO author_tab VALUES (:x, :y)";
    stmt=conn->createStatement (sqlStmt);
    try{
    stmt->setInt (1, c1);
    stmt->setString (2, c2);
    stmt->executeUpdate ();
    cout << "insert - Success" << endl;
    }catch(SQLException ex)
    {
     cout<<"Exception thrown for insertBind"<<endl;
     cout<<"Error number: "<<  ex.getErrorCode() << endl;
     cout<<ex.getMessage() << endl;
    }

    conn->terminateStatement (stmt);
  }

  /**
   * Inserting a row into the table.
   */
  void insertRow ()
  {
    string sqlStmt = "INSERT INTO author_tab VALUES (111, 'ASHOK')";
    stmt = conn->createStatement (sqlStmt);
    try{
    stmt->executeUpdate ();
    cout << "insert - Success" << endl;
    }catch(SQLException ex)
    {
     cout<<"Exception thrown for insertRow"<<endl;
     cout<<"Error number: "<<  ex.getErrorCode() << endl;
     cout<<ex.getMessage() << endl;
    }

    conn->terminateStatement (stmt);
  }

  /**
   * updating a row
   */
  void updateRow (int c1, string c2)
  {
    string sqlStmt = 
      "UPDATE author_tab SET author_name = :x WHERE author_id = :y";
    stmt = conn->createStatement (sqlStmt);
    try{
    stmt->setString (1, c2);
    stmt->setInt (2, c1);
    stmt->executeUpdate ();
    cout << "update - Success" << endl;
    }catch(SQLException ex)
    {
     cout<<"Exception thrown for updateRow"<<endl;
     cout<<"Error number: "<<  ex.getErrorCode() << endl;
     cout<<ex.getMessage() << endl;
    }

    conn->terminateStatement (stmt);
  }


  /**
   * deletion of a row
   */
  void deleteRow (int c1, string c2)
  {
    string sqlStmt = 
      "DELETE FROM author_tab WHERE author_id= :x AND author_name = :y";
    stmt = conn->createStatement (sqlStmt);
    try{
    stmt->setInt (1, c1);
    stmt->setString (2, c2);
    stmt->executeUpdate ();
    cout << "delete - Success" << endl;
    }catch(SQLException ex)
    {
     cout<<"Exception thrown for deleteRow"<<endl;
     cout<<"Error number: "<<  ex.getErrorCode() << endl;
     cout<<ex.getMessage() << endl;
    }

    conn->terminateStatement (stmt);
  }

  /**
   * displaying all the rows in the table
   */
  void displayAllRows ()
  {
    string sqlStmt = "SELECT author_id, author_name FROM author_tab";
    stmt = conn->createStatement (sqlStmt);
    ResultSet *rset = stmt->executeQuery ();
    try{
    while (rset->next ())
    {
      cout << "author_id: " << rset->getInt (1) << "  author_name: " 
        << rset->getString (2) << endl;
    }
    }catch(SQLException ex)
    {
     cout<<"Exception thrown for displayAllRows"<<endl;
     cout<<"Error number: "<<  ex.getErrorCode() << endl;
     cout<<ex.getMessage() << endl;
    }

    stmt->closeResultSet (rset);
    conn->terminateStatement (stmt);
  }

}; // end of class  occidml


int main (void)
{
  string user = "SCOTT";
  string passwd = "TIGER";
  string db = "";

  cout << "occidml - Exhibiting simple insert, delete & update operations" 
    << endl;
  occidml *demo = new occidml (user, passwd, db);

  cout << "Displaying all records before any operation" << endl;
  demo->displayAllRows ();

  cout << "Inserting a record into the table author_tab " 
    << endl;
  demo->insertRow ();

  cout << "Displaying the records after insert " << endl;
  demo->displayAllRows ();

  cout << "Inserting a records into the table author_tab using dynamic bind"
    << endl;
  demo->insertBind (222, "ANAND");
 
  cout << "Displaying the records after insert using dynamic bind" << endl;
  demo->displayAllRows ();

  cout << "deleting a row with author_id as 222 from author_tab table" << endl;
  demo->deleteRow (222, "ANAND");

  cout << "updating a row with author_id as 444 from author_tab table" << endl;
  demo->updateRow (444, "ADAM");

  cout << "displaying all rows after all the operations" << endl;
  demo->displayAllRows ();

  delete (demo);
  cout << "occidml - done" << endl;
}