一、JDBC操作

package dao;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;


public class DBDao {
    static String DBURL="jdbc:mysql://localhost:3306/bookmanage";
    static String DBUser="root";
    static String DBPswd="123456";
    static String DBDriver="com.mysql.jdbc.Driver";
    
    static Connection connection=null;
    
    public static Connection getConnection(){
        try {
            Class.forName(DBDriver);
            connection=DriverManager.getConnection(DBURL, DBUser,DBPswd);
        } catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
        }
        return connection;
    }
    public static void closeConnection(Connection connection){
        if(connection!=null){
            try {
                connection.close();
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            connection=null;
        }
    }
}

2.

package dao;

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

import bean.Book;

public class BookDao {
    static Connection connection=null;
    static String erro="";
    public static ResultSet getAllBook(){
        ResultSet rs=null;
        
        String SQL="select * from bookInfo";
        try {        
            connection = DBDao.getConnection();
            PreparedStatement ppsm=connection.prepareStatement(SQL);
            rs = ppsm.executeQuery();
        } catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
        }
        return rs;
    }
    public static ResultSet getIdBook(int id){
        ResultSet rs =null;
        String SQL="select * from bookInfo where bookId ="+id;
        try {        
            connection = DBDao.getConnection();
            PreparedStatement ppsm=connection.prepareStatement(SQL);
            rs = ppsm.executeQuery();    
        } catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
        }
        return rs;
    }
    public static boolean uptateBook(int oldBookId,int newBookId,String bookName,String bookAuthor,String bookPress){
        boolean flag=false;
        String SQL="update bookInfo set bookId=?,bookName=?,bookAuthor=?,bookPress=? where bookId="+oldBookId;
        try {        
            connection = DBDao.getConnection();
            PreparedStatement ppsm=connection.prepareStatement(SQL);
            ppsm.setInt(1, newBookId);
            ppsm.setString(2, bookName);
            ppsm.setString(3, bookAuthor);
            ppsm.setString(4, bookPress);
            int rs = ppsm.executeUpdate();
            if(rs==1) flag=true;
        } catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
        }
        return flag;
    }
    public static boolean deleteBook(int id){
        boolean flag=false;
        String SQL="delete from bookInfo where bookId ="+id;
        try {        
            connection = DBDao.getConnection();
            PreparedStatement ppsm=connection.prepareStatement(SQL);
            int rs = ppsm.executeUpdate();
            if(rs==1) flag=true;
        } catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
        }
        return flag;
    }
    public static ResultSet getBook(String s){
        ResultSet rs =null;
        String SQL="select * from bookInfo where bookId like '%"+s+"%' or bookName like '%"+s+"%' or bookAuthor like '%"+s+"%' or bookPress like '%"+s+"%'";
        try {        
            connection = DBDao.getConnection();
            PreparedStatement ppsm=connection.prepareStatement(SQL);
            rs = ppsm.executeQuery();
            
        } catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
        }
        return rs;
    }
    public static Connection getConnection() {
        return connection;
    }
    public static void setConnection(Connection connection) {
        BookDao.connection = connection;
    }
    public static boolean insertBook(Book book){
        boolean flag=false;
        String SQL="insert into bookInfo values(?,?,?,?)";
        try{
            connection = DBDao.getConnection();
            PreparedStatement ppsm=connection.prepareStatement(SQL);
            ppsm.setInt(1, book.getBookId());
            ppsm.setString(2, book.getBookName());
            ppsm.setString(3, book.getBookAuthor());
            ppsm.setString(4, book.getBookPress());
            int rs = ppsm.executeUpdate();
            if(rs==1){
                flag=true;
            }
        } catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
        }
        return flag;
    }
}