1，驱动加载
//注册驱动
//DriverManager.registerDriver(new Driver());此方法被淘汰
Class.forName("com.mysql.jdbc.Driver");
第一种方法的缺点：
（1）依赖jar包
（2）驱动注册了两次（在 Driver（）里面注册了一次）
2.获取链接
//建立连接2
public static Connection getConn2() throws SQLException
{
Properties info= new Properties();
info.setProperty("user", "root");
info.setProperty("password", "123");
conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/day06",info);
return conn;
}
//建立连接3
public static Connection getConn3() throws SQLException
{
Connection cnn=DriverManager.getConnection("jdbc:mysql://localhost:3306/day06？user=root&password=123");
return conn;
}
//获取链接
conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/day06","root","247418");
建立连接的三种方式：第三种方式最常用
3.对数据库的操作
//对数据库的操作--选择
public static ResultSet QueryTest() throws Exception
{
rs=sta.executeQuery("select * from users");
return rs;
}
//对数据库的操作--插入
public static int insertTest() throws Exception
{
int num_i=sta.executeUpdate("insert into users values(005,‘zhansan‘,‘123‘,‘[email protected]‘,‘1980-12-04‘)");
return num_i;
}
//对数据库的操作--删除
public static int deleteTest() throws Exception
{
int num_d=sta.executeUpdate("delete from users where id=‘001‘");
return num_d;
}
//对数据库的操作--更新
public static int updateTest() throws Exception
{
int num_d=sta.executeUpdate("update users set name=‘ooo‘ where id=‘002‘");
return num_d;
}
4.对结果的操作
//对结果的操作1
public static void QueryRes1() throws Exception
{
while(rs.next())
{
User u=new User();
u.setId(rs.getInt("id"));
u.setName(rs.getString("name"));
u.setPassword(rs.getString("password"));
u.setEmail(rs.getString("email"));
u.setBirthday(rs.getDate("birthday"));
al.add(u);
}
}
//对结果的操作2
public static void QueryRes2() throws Exception
{
while(rs.next())
{
System.out.println(rs.getObject(1));
System.out.println(rs.getObject(2));
System.out.println(rs.getObject(3));
System.out.println(rs.getObject(4));
System.out.println(rs.getObject(5));
System.out.println("-----------------");
}
}
package songyan.jdbc.entity;
import java.util.Date;
public class User {
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;
}
}