package simpledb;

/**

* Inserts tuples read from the child operator into the tableId specified in the

* constructor

*/

public class Insert extends Operator {

private static final long serialVersionUID = 1L;

/**

* Constructor.

*

* @param t

* The transaction running the insert.

* @param child

* The child operator from which to read tuples to be inserted.

* @param tableId

* The table in which to insert tuples.

* @throws DbException

* if TupleDesc of child differs from table into which we are to

* insert.

*/

public Insert(TransactionId t, OpIterator child, int tableId)

throws DbException {

// some code goes here

}

public TupleDesc getTupleDesc() {

// some code goes here

return null;

}

public void open() throws DbException, TransactionAbortedException {

// some code goes here

}

public void close() {

// some code goes here

}

public void rewind() throws DbException, TransactionAbortedException {

// some code goes here

}

/**

* Inserts tuples read from child into the tableId specified by the

* constructor. It returns a one field tuple containing the number of

* inserted records. Inserts should be passed through BufferPool. An

* instances of BufferPool is available via Database.getBufferPool(). Note

* that insert DOES NOT need check to see if a particular tuple is a

* duplicate before inserting it.

*

* @return A 1-field tuple containing the number of inserted records, or

* null if called more than once.

* @see Database#getBufferPool

* @see BufferPool#insertTuple

*/

protected Tuple fetchNext() throws TransactionAbortedException, DbException {

// some code goes here

return null;

}

@Override

public OpIterator[] getChildren() {

// some code goes here

return null;

}

@Override

public void setChildren(OpIterator[] children) {

// some code goes here

}

}