What is the suitable way to close the database connection in Java?

Question

I tried to close the DB connection.But had a bit of confusion, say

ResultSet rs = null 

Whether I have to it close by

rs.c         


        

Answer 1

Closing the resultSet doesn't close the database connection. We should close the connection as like given below. Before closing the connection you should close the other instance like ResultSet, PreparedStatement and Statement instances.

for example

 Connection con = DBUtils.getConnection();
 ....
 PreparedStatemet pstmt = con.getPreparedStatement();
 ResultSet rs = pstmt.execute();

 while(rs.next())
 {
 }

// Once you done the ResultSet... It's time to close/release the Instances.

    if (resultSet != null) {
    try {
    resultSet.close();
    resultSet = null;
    } catch (SQLException e) {
      // ignore the exceptions.
    }
    }

    // Close the Prepared Statement
    if(theStatement != null)
    {
    try
    {
    theStatement.close();
    theStatement = null;
    }
    catch(Exception ignored)
    {
    }

// Close the Connection
    if(theConnection != null)
    {
    try
    {
    theConnection.close();
    theConnection = null;
    }
    catch(Exception ignored)
    {
    }