java通过JDBC连接数据库

1. 数据库

2.java程序

import java.io.Serializable;
import java.util.Date;
//实体Bean：Enity JavaBean
//Java类型和数据库类型：对应关系。相对固定的
public class User implements Serializable {
private int id;
private String name;
private String password;
private String email;
private Date birthday;
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;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
@Override
public String toString() {
return "User [id=" + id + ", name=" + name + ", password=" + password
+ ", email=" + email + ", birthday=" + birthday + "]";
}

}

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
import java.util.Properties;


import com.itheima.user.User;


public class JdbcDemo4 {


public static void main(String[] args) throws Exception {
Class.forName("com.mysql.jdbc.Driver");
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/day15", "root", "");
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery("select id,name,password,email,birthday from users");


List<User> users = new ArrayList<User>();
while(rs.next()){


User user = new User();
user.setId(rs.getInt("id"));
user.setName(rs.getString("name"));
user.setPassword(rs.getString("password"));
user.setEmail(rs.getString("email"));
user.setBirthday(rs.getDate("birthday"));
users.add(user);

}
rs.close();
stmt.close();
conn.close();

for(User u:users)
System.out.println(u);
}


}

运行结果：

User [id=1, name=zs, password=123456, email=zs@sina.com, birthday=1980-12-04]
User [id=2, name=lisi, password=123456, email=lisi@sina.com, birthday=1981-12-04]
User [id=3, name=wangwu, password=123456, email=wangwu@sina.com, birthday=1979-12-04]