Java实现JDBC连接数据库简单案例

import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class DBM {
  public static void main(String[] args){
    //数据库连接参数
    String driverStr="com.microsoft.sqlserver.jdbc.SQLServerDriver";
    String connStr="jdbc:sqlserver://127.0.0.1:1433;DatabaseName=school";// 可以localhost代替ip地址，端口号1433
    String dbUserName="sa";
    String dbPassword="";

    Connection conn = null;
    Statement stmt = null;
    ResultSet rs = null;

    //1.连接数据库
    try{
      Class.forName(driverStr);
      conn = DriverManager.getConnection(connStr,dbUserName,dbPassword);
      stmt = conn.createStatement();
      System.out.println("数据库建立连接成功！");
    }catch(Exception ex){
      System.out.println("无法与数据库建立连接！");
      System.out.println(ex.toString());
    }

    //2.查询
    try {
      rs = stmt.executeQuery("select * from student");
    } catch (SQLException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
    //3.显示
    try {
      while(rs.next()){
        System.out.println(rs.getInt("sid")+" "+rs.getString("sname")+" "+rs.getString("ssex")+" "+rs.getInt("sage"));
      }
    } catch (SQLException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
  }
}