javaweb实现Dao类连接数据库
话不多说，直接上代码
package com.Dao;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class DBjdbc {
/**
* @param args
*/
private final String url="jdbc:mysql://localhost:3306/你的数据库名字";
private final String name="root";
private final String password="你的密码";
private Connection con;
public DBjdbc(){
try {
//加载驱动程序；
Class.forName("com.mysql.jdbc.Driver");
//获得数据库连接；
con=DriverManager.getConnection(url,name,password);
}catch (ClassNotFoundException|SQLException e) {
// TODO: handle exception
System.out.println("驱动加载失败");
}
}
public void close() {
if (this.con!=null) {
try {
this.con.close();
} catch (SQLException e) {
// TODO: handle exception
System.out.println("数据库关闭失败");
}
}
}
public Connection getConnection() {
// TODO Auto-generated method stub
return this.con;
}
}
package com.bean;
public class users {
private int id;
private String name;
private String password;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
package com.Dao;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import com.bean.users;
public class updateing {
public void checkusers(){
String sql="select * from users";
DBjdbc con=new DBjdbc();
PreparedStatement pSt;
try {
pSt=con.getConnection().prepareStatement(sql);
ResultSet rSet=pSt.executeQuery();
while (rSet.next()) {
int id=rSet.getInt("id");
String name=rSet.getString("name");
String password=rSet.getString("password");
System.out.println("学生编号："+id+ "学生姓名："+name+"学生密码："+password);
}
} catch (SQLException e) {
// TODO: handle exception
}
con.close();
}
public static void main(String[] args) {
updateing dd=new updateing();
dd.checkusers();
}
}
这特么真是美好的一天，记录一下这该死的代码，让我下次使用的时候能够。ctrl+A+C+V.
