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求jsp与mysql连接的代码
import java.sql.*;
public class DbOperator {
public final String DB_USER= “root”;
public final String DB_PWD = “1234”;
public final String DB_HOST = “127.0.0.1”;
public final String DB_NAME = “test”;
public DbOperator() {
}
/**
* 得到数据库连接
* @return Connection
*/
public Connection getConnection()
{
Connection conn = null;
String url = “jdbc:mysql://”+this.DB_HOST+”/”+this.DB_NAME+”?useUnicode=truecharacterEncoding=GBK”;
try
{
Class.forName(“com.mysql.jdbc.Driver”).newInstance();
conn = java.sql.DriverManager.getConnection(url, this.DB_USER, this.DB_PWD);
}catch(Exception e)
{
e.printStackTrace();
}
return conn;
}
}
使用的
Connection conn = dbOperator.getConnection();
try
{
Statement st = conn.createStatement();
String sql = ” select * from user where username ='” + username + “‘ and pwd ='” + pwd + “‘”;
ResultSet rs = st.executeQuery(sql);
if(rs.next())
{
userInfo = new UserInfo();
userInfo.setAge(rs.getString(“age”));
userInfo.setId(rs.getInt(“id”));
userInfo.setPwd(rs.getString(“pwd”));
userInfo.setSex(rs.getString(“sex”));
userInfo.setTheName(rs.getString(“the_name”));
userInfo.setUserName(rs.getString(“username”));
}
rs.close();
st.close();
conn.close();
}catch(Exception e)
{
e.printStackTrace();
}
return userInfo;
jsp+mysql源代码怎么用
一般下载的源码，自己可以直接阅读，如果是以某些文件的工程文件打包的，可以自己下载相应IDE环境来打开操作，比如myeclipse，自己下载源码后，可以导入MyEclipse中，然后把sql文件导入mysql中，生成本地的数据库，接着找到项目中配置数据库连接的java类，把数据库的用户名和密码改成你自己的数据库的用户名和密码（这步很重要），最后把项目部署到tomcat中，启动tomcat服务器，就可以运行了
求JSP向mysql插入，删除，查询数据源代码
还有这样的需求呀？无奇不有……
写的dao的实现就行了呀 ，何必得要jsp呢？用jsp，只会越来越乱^
CustomerDao.java
package cn.itcast.dao;
import java.util.List;
import cn.itcast.domain.Customer;
public interface CustomerDao {
public void add(Customer customer);
public Customer find(int id);
public List getAllCustomer();
public void delete(int id);
public void update(Customer customer);
public int getAllRecord();
public List getCustomerByPage(int startindex,int pagesize);
}
CustomerDaoJdbcImpl.java
package cn.itcast.dao.impl;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.List;
import cn.itcast.dao.CustomerDao;
import cn.itcast.domain.Customer;
import cn.itcast.util.JdbcUtils;
public class CustomerDaoJdbcImpl implements CustomerDao {
/*
id int primary key auto_increment,
name varchar(20) not null,
sex varchar(4) not null,
birthday date,
cellphone varchar(20) not null,
Email varchar(40),
preference varchar(100),
type varchar(40),
Description varchar(255)
*/
public void add(Customer customer) {
Connection conn = null;
PreparedStatement st = null;
ResultSet rs = null;
try{
conn = JdbcUtils.getConnection();
String sql = “insert into customer(name,sex,birthday,cellphone,email,preference,type,description) values(?,?,?,?,?,?,?,?)”;
st = conn.prepareStatement(sql);
st.setString(1, customer.getName());
st.setString(2, customer.getSex());
st.setDate(3, new java.sql.Date(customer.getBirthday().getTime()));
st.setString(4, customer.getCellphone());
st.setString(5, customer.getEmail());
st.setString(6, customer.getPreference());
st.setString(7, customer.getType());
st.setString(8, customer.getDescription());
st.executeUpdate();
}catch(Exception e){
throw new RuntimeException(e);
}finally{
JdbcUtils.release(rs, st, conn);
}
}
public void delete(int id) {
Connection conn = null;
PreparedStatement st = null;
ResultSet rs = null;
try{
conn = JdbcUtils.getConnection();
String sql = “delete from customer where id=?”;
st = conn.prepareStatement(sql);
st.setInt(1, id);
st.executeUpdate();
}catch(Exception e){
throw new RuntimeException(e);
}finally{
JdbcUtils.release(rs, st, conn);
}
}
public Customer find(int id) {
Connection conn = null;
PreparedStatement st = null;
ResultSet rs = null;
try{
conn = JdbcUtils.getConnection();
String sql = “select id,name,sex,birthday,cellphone,email,preference,type,description from customer where id=?”;
st = conn.prepareStatement(sql);
st.setInt(1, id);
rs = st.executeQuery();
if(rs.next()){
Customer c = new Customer();
c.setId(rs.getInt(“id”));
c.setName(rs.getString(“name”));
c.setSex(rs.getString(“sex”));
c.setBirthday(rs.getDate(“birthday”));
c.setCellphone(rs.getString(“cellphone”));
c.setEmail(rs.getString(“email”));
c.setPreference(rs.getString(“preference”));
c.setType(rs.getString(“type”));
c.setDescription(rs.getString(“description”));
return c;
}
return null;
}catch(Exception e){
throw new RuntimeException(e);
}finally{
JdbcUtils.release(rs, st, conn);
}
}
/*
Id 编号 varchar(20)
name 客户姓名 varchar(20)
sex 性名 varchar(4)
birthday 生日 date
cellphone 手机 varchar(20)
Email 电子邮件 varchar(40)
preference 客户爱好 varchar(100)
type 客户类型 varchar(40)
Description 备注 varchar(255)
*/
public List getAllCustomer() {
Connection conn = null;
PreparedStatement st = null;
ResultSet rs = null;
try{
conn = JdbcUtils.getConnection();
String sql = “select id,name,sex,birthday,cellphone,email,preference,type,description from customer order by id”;
st = conn.prepareStatement(sql);
rs = st.executeQuery();
List list = new ArrayList();
while(rs.next()){
Customer c = new Customer();
c.setId(rs.getInt(“id”));
c.setName(rs.getString(“name”));
c.setSex(rs.getString(“sex”));
c.setBirthday(rs.getDate(“birthday”));
c.setCellphone(rs.getString(“cellphone”));
c.setEmail(rs.getString(“email”));
c.setPreference(rs.getString(“preference”));
c.setType(rs.getString(“type”));
c.setDescription(rs.getString(“description”));
list.add(c);
}
return list;
}catch(Exception e){
throw new RuntimeException(e);
}finally{
JdbcUtils.release(rs, st, conn);
}
}
public void update(Customer customer) {
Connection conn = null;
PreparedStatement st = null;
ResultSet rs = null;
try{
conn = JdbcUtils.getConnection();
String sql = “update customer set name=?,sex=?,birthday=?,cellphone=?,email=?,preference=?,type=?,description=? where id=?”;
st = conn.prepareStatement(sql);
st.setString(1, customer.getName());
st.setString(2, customer.getSex());
st.setDate(3, new java.sql.Date(customer.getBirthday().getTime()));
st.setString(4, customer.getCellphone());
st.setString(5, customer.getEmail());
st.setString(6, customer.getPreference());
st.setString(7, customer.getType());
st.setString(8, customer.getDescription());
st.setInt(9, customer.getId());
st.executeUpdate();
}catch(Exception e){
throw new RuntimeException(e);
}finally{
JdbcUtils.release(rs, st, conn);
}
}
public int getAllRecord() {
Connection conn = null;
PreparedStatement st = null;
ResultSet rs = null;
try{
conn = JdbcUtils.getConnection();
String sql = “select count(*) from customer”;
st = conn.prepareStatement(sql);
rs = st.executeQuery();
if(rs.next()){
return rs.getInt(1);
}
return 0;
}catch(Exception e){
throw new RuntimeException(e);
}finally{
JdbcUtils.release(rs, st, conn);
}
}
public List getCustomerByPage(int startindex, int pagesize) {
Connection conn = null;
PreparedStatement st = null;
ResultSet rs = null;
try{
conn = JdbcUtils.getConnection();
String sql = “select id,name,sex,birthday,cellphone,email,preference,type,description from customer limit ?,?”;
st = conn.prepareStatement(sql);
st.setInt(1, startindex);
st.setInt(2, pagesize);
rs = st.executeQuery();
List list = new ArrayList();
while(rs.next()){
Customer c = new Customer();
c.setId(rs.getInt(“id”));
c.setName(rs.getString(“name”));
c.setSex(rs.getString(“sex”));
c.setBirthday(rs.getDate(“birthday”));
c.setCellphone(rs.getString(“cellphone”));
c.setEmail(rs.getString(“email”));
c.setPreference(rs.getString(“preference”));
c.setType(rs.getString(“type”));
c.setDescription(rs.getString(“description”));
list.add(c);
}
return list;
}catch(Exception e){
throw new RuntimeException(e);
}finally{
JdbcUtils.release(rs, st, conn);
}
}
}
jsp怎么连接mysql数据库代码
jsp连接mysql数据库的操作方式。
1、在数据服务端安装好mysql数据库，这个是必须的，在自己的ssh或者虚拟机上，数据mysql可以看到相关的提示，说明安装成功
2、我是用的是tomcat服务器，在这里需要安装好java连接mysql的数据库操作库。我是用的jar包是：mysql-connector-java-3.1.14.tar.gz，大家可以在网上下载，或者，在官网上下载
3、把解包后的jar放到tomcat里面的lib文件夹下
4、在程序的代码段里添加连接函数库和库函数，就可以连接到mysql数据库了
5、剩下的就是我们使用的时候调用这样的数据了，在jsp里使用mysql数据库中的数据
原创文章，作者：小蓝，如若转载，请注明出处：https://www.506064.com/n/248473.html
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