accountdao.java

加拿大达内科技有限公司配需java程序员的上课时的代码

package com.tarena.bank.persist;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import com.tarena.bank.biz.Account;

public class AccountDAO implements IAccountDAO {
    private String t = "t_sd0711_act";
	public void insert(Account act) {
		Connection con = JdbcUtil.getConnection();
        PreparedStatement ps = null;
        String sql = "insert into "+
           t+" values(?,?)";
        try {
			ps = con.prepareStatement(sql);
			ps.setString(1,act.getActNo());
			ps.setDouble(2,act.getBal());
			ps.executeUpdate();
		} catch (SQLException e) {
			e.printStackTrace();
		}finally{
			JdbcUtil.release(null,ps,con);
		}
	}

	public void delete(String actNo) {
		Connection con = JdbcUtil.getConnection();
        PreparedStatement ps = null;
        String sql = "delete table "+t;
        try {
			ps = con.prepareStatement(sql);
			ps.executeUpdate();
		} catch (SQLException e) {
			e.printStackTrace();
		}finally{
			JdbcUtil.release(null,ps,con);
		}

	}

	public void update(Account act) {
		Connection con = JdbcUtil.getConnection();
        PreparedStatement ps = null;
        String sql = "update "+
           t+" set actNo=?,bal=? " +
           "where actNo=?";
        try {
			ps = con.prepareStatement(sql);
			ps.setString(1,act.getActNo());
			ps.setDouble(2,act.getBal());
			ps.setString(3,act.getActNo());
			ps.executeUpdate();
		} catch (SQLException e) {
			e.printStackTrace();
		}finally{
			JdbcUtil.release(null,ps,con);
		}

	}

	public Account findByActNo(String actNo) {
		Account act = null;
		Connection con = JdbcUtil.getConnection();
        PreparedStatement ps = null;
        ResultSet rs = null;
        String sql = "select * from "+
           t+" where actNo=?";
        try {
			ps = con.prepareStatement(sql);
			ps.setString(1,actNo);
			rs = ps.executeQuery();
			if(rs.next()){
			  act = new Account(
			    rs.getString(1),rs.getDouble(2));
			}
		} catch (SQLException e) {
			e.printStackTrace();
		}finally{
			JdbcUtil.release(rs,ps,con);
		}
		return act;
	}

}