编写数据库常用的增、删、改、查代码(1)。

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package com.s.dao.iml;

import com.s.bean.Manager;

import com.s.dao.sysManager;

import com.s.util.DBConnection;

import java.sql.Connection;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;

import java.util.ArrayList;

import java.util.List;

import java.util.logging.Level;

import java.util.logging.Logger;

/**

 *

 * @author Administrator

 */

public class sysManagerimp implements sysManager {

    Connection conn = null;

    Statement stm = null;

    PreparedStatement pst = null;

    List<Manager> list = null;

    ResultSet rs = null;

    String sql = "select * from t_manager";

    public List<Manager> findManagerAll() {

        try {

            conn = DBConnection.getConnection();

            stm = conn.createStatement();

            rs = stm.executeQuery(sql);

            list = new ArrayList<Manager>();

            while (rs.next()) {

                Manager m = new Manager();

                m.setId(rs.getInt(1));

                m.setUsername(rs.getString(2));

                m.setPassword(rs.getString(3));

                list.add(m);

            }

        } catch (SQLException ex) {

            Logger.getLogger(sysManagerimp.class.getName()).log(Level.SEVERE, null, ex);

        } finally {

//            DBConnection.closeResultSet(rs);

//            DBConnection.closeStatement(stm);

//            DBConnection.closeConn(conn);

        }

        return list;

    }

    @Override

    public int addManager(String username, String password) {

        int row = 0;

        try {

            conn = DBConnection.getConnection();

            String sql1 = "  insert into t_manager (sysaccount,Syspassword) values (?,?)";

            pst = conn.prepareStatement(sql1);

            pst.setString(1, username);

            pst.setString(2, password);

            row = pst.executeUpdate();

        } catch (SQLException ex) {

            Logger.getLogger(sysManagerimp.class.getName()).log(Level.SEVERE, null, ex);

        }finally {

            DBConnection.closeResultSet(rs);

            DBConnection.closeStatement(stm);

            DBConnection.closeConn(conn);

        }

        return row;

    }

}