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POgeneric DAO in java
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2010-05-17T11:44:58.133
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2013-04-23T15:37:55.963
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2013-04-23T15:21:59.560
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text
Body
<p>I am trying to develop generic DAO in java. I have tried the following. Is this a good way to implement generic DAO? I don't want to use hibernate. I am trying to make it as generic as possible so that I don't have to repeat the same code over and over again.</p> <pre><code>public abstract class AbstractDAO<T> { protected ResultSet findbyId(String tablename, Integer id){ ResultSet rs= null; try { // the following lines are not working pStmt = cn.prepareStatement("SELECT * FROM "+ tablename+ "WHERE id = ?"); pStmt.setInt(1, id); rs = pStmt.executeQuery(); } catch (SQLException ex) { System.out.println("ERROR in findbyid " +ex.getMessage() +ex.getCause()); ex.printStackTrace(); }finally{ return rs; } } } </code></pre> <p>Now I have:</p> <pre><code>public class UserDAO extends AbstractDAO<User>{ public List<User> findbyid(int id){ Resultset rs =findbyid("USERS",id) // "USERS" is table name in DB List<Users> users = convertToList(rs); return users; } private List<User> convertToList(ResultSet rs) { List<User> userList= new ArrayList(); User user= new User();; try { while (rs.next()) { user.setId(rs.getInt("id")); user.setUsername(rs.getString("username")); user.setFname(rs.getString("fname")); user.setLname(rs.getString("lname")); user.setUsertype(rs.getInt("usertype")); user.setPasswd(rs.getString("passwd")); userList.add(user); } } catch (SQLException ex) { Logger.getLogger(UserDAO.class.getName()).log(Level.SEVERE, null, ex); } return userList; } } </code></pre>
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<java><dao><genericdao>
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generic DAO in java
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