import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class helloworld {
public static void main(String[] args) throws ClassNotFoundException, SQLException {
Class.forName("com.mysql.jdbc.Driver");
Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydata?useUnicode=true&characterEncoding=utf-8", "root", "");
System.out.println(con);
String sql_in = "insert into student values(null, ?, ?)";
PreparedStatement pst_in = con.prepareStatement(sql_in);
pst_in.setString(1, "灑錒魤");
pst_in.setInt(2, 56);
int exi = pst_in.executeUpdate();
if(exi == 1) System.out.println("insert success");
String sql_de = "delete from student where id=?";
PreparedStatement pst_de = con.prepareStatement(sql_de);
pst_de.setInt(1, 13);
int exd = pst_de.executeUpdate();
if(exd == 1) System.out.println("delete success");
String sql_ud = "update student set name=?,age=? where id=?";
PreparedStatement pst_ud = con.prepareStatement(sql_ud);
pst_ud.setString(1, "xiaohong");
pst_ud.setInt(2, 99);
pst_ud.setInt(3, 8);
int exu = pst_ud.executeUpdate();
if(exu == 1) System.out.println("update success");
String sql = "select * from student";
PreparedStatement pst = con.prepareStatement(sql);
ResultSet rs = pst.executeQuery();
while(rs.next())
{
int id = rs.getInt(1);
String name = rs.getString(2);
int age = rs.getInt(3);
System.out.printf("%d %s %d\n", id, name, age);
}
rs.close();
pst.close();
con.close();
}
}