web练习

11.22

今天练习了web项目，打算开发我第一个大型的系统，没遇到什么问题，明天计划继续练习web项目；

代码部分：

package com.pp;

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

public class dao {
public void insert(get L) throws SQLException {
String sql = "insert into xuesheng(xuehao,xingming,banji,kecheng,fenshu) values(?,?,?,?,?)";
Connection connection = DBU.getConnection();
PreparedStatement preparedStatement = null;
preparedStatement = connection.prepareStatement(sql);
preparedStatement.setString(1,L.getXuehao());
preparedStatement.setString(2,L.getXingming());
preparedStatement.setString(3,L.getBanji());
preparedStatement.setString(4,L.getKecheng());
preparedStatement.setString(5,L.getFenshu());
preparedStatement.execute();
}
public void update(String xuehao,String xingming,String banji,String kecheng,String fenshu) throws SQLException {
String sql="UPDATE xuesheng SET xuehao=?,xingming=?,banji=?,kecheng=? fenshu=?";
Connection conn= DBU.getConnection();
PreparedStatement papre=conn.prepareStatement(sql);
papre.setString(1, xuehao);
papre.setString(2, xingming);
papre.setString(3, banji);
papre.setString(4, kecheng);
papre.setString(5, fenshu);
papre.execute();
}
public void delete(String xingming) throws SQLException {
String sql="delete from xuesheng where xingming=?";
Connection conn= DBU.getConnection();
PreparedStatement papre=conn.prepareStatement(sql);
papre.setString(1, xingming);
papre.execute();
}
}

package com.pp;
import java.sql.*;
public class DBU{
private DBU() {}
static {
try {
Class.forName("com.mysql.jdbc.Driver");
}catch(ClassNotFoundException e) {
e.printStackTrace();
}
}
public static Connection getConnection() throws SQLException{
return DriverManager.getConnection("jdbc:mysql://localhost:3306/user?serverTimezone=UTC&useUnicode=true&zeroDateTimeBehavior=convertToNull&autoReconnect=true&characterEncoding=utf-8","root","123456");
}
public static void close(Connection conn,Statement ps,ResultSet rs) {
if(rs!=null) {
try {
rs.close();
}catch(SQLException s) {
s.printStackTrace();
}
}
if(ps!=null) {
try {
ps.close();
}catch(SQLException s) {
s.printStackTrace();
}
}
if(conn!=null) {
try {
conn.close();
}catch(SQLException s) {
s.printStackTrace();
}
}
}
}

package com.pp;

public class get {
String xuehao;
String xingming;
String banji;
String kecheng;
String fenshu;



public String getXuehao() {
return xuehao;
}

public void setXuehao(String xuehao) {
this.xuehao = xuehao;
}

public String getXingming() {
return xingming;
}

public void setXingming(String xingming) {
this.xingming = xingming;
}

public String getBanji() {
return banji;
}

public void setBanji(String banji) {
this.banji = banji;
}

public String getKecheng() {
return kecheng;
}

public void setKecheng(String kecheng) {
this.kecheng = kecheng;
}

public String getFenshu() {
return fenshu;
}

public void setFenshu(String fenshu) {
this.fenshu = fenshu;
}

public get(String xuehao2,String a,String b,String c,String d) {
xuehao=xuehao2;
xingming=a;
banji=b;
kecheng=c;
fenshu=d;
}
}