16f.txt

一本关于JBuilder 应用开发的书籍,希望大家喜欢,其实我没看过的,

public AccountPK ejbCreate(String name, float balance) throws RemoteException, CreateException 
{
try 
{
      // 查找主键，看看这个Bean有没有被实例化
      ejbFindByPrimaryKey(new AccountPK(name));
      // 如果被实例化，就抛出一个异常
      throw new DuplicateKeyException();
    }
catch(ObjectNotFoundException e) 
{
      // 没有，就继续
    }
    _name = name;
    _balance = balance;
    Connection connection = null;
    PreparedStatement statement = null;
try 
{
//和数据库建立连接
connection = getConnection();
//设置SQL语句
statement = connection.prepareStatement("INSERT INTO Savings_Accounts (name, balance) VALUES (?, ?)");
//设置参数
      statement.setString(1, _name);
statement.setFloat(2, _balance);
//执行SQL
if(statement.executeUpdate() != 1) 
{
        throw new CreateException("Could not create: " + name);
      }
      return new AccountPK(name);
    }
catch(SQLException e) 
{
      throw new RemoteException("Could not create: " + name, e);
} 
finally 
{
try 
{
        if (statement != null) 
{
          statement.close();
        }
        if (connection != null) 
{
          connection.close();
        }
} 
catch (SQLException sqe)
{
        throw new RemoteException("Could not create, close statement, connection: " + name, sqe);
      }
    }
  }