JDBC连接数据库 prepareStatement

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import team.JDBCTest;

public class DBCStudent {
	 // 定义数据库访问参数
	 String url = "jdbc:sqlserver://localhost:1433;DatabaseName=JDBCTest";
	 String user = "sa";
	 String password = "aaaaaa";
	 static String driverName = "com.microsoft.sqlserver.jdbc.SQLServerDriver";
	 Connection conn;
	 PreparedStatement ps;
	 ResultSet rs;
	 String id="";
	 String name="";
	 int age=0;
	 String sex="";
	 // 1、加载驱动
	static {
		try {
			Class.forName(driverName);
		} catch (ClassNotFoundException e) {
			System.out.println("驱动加载失败");
		}
	}
	// 2、创建连接对象
	public  Connection getConnection() throws SQLException{
		conn=DriverManager.getConnection(url,user,password);
		return conn;
	}
	public  void add(String id,String name,int age,String sex) throws ClassNotFoundException, SQLException {
   // 定义sql语句
	String sql="INSERT INTO STUDENTMANAGE(STUDENTID,STUDENTNAME,AGE,SEX) VALUES(?,?,?,?)";	

   // 3、创建语句对象
    ps=getConnection().prepareStatement(sql);
    ps.setString(1,id);
    ps.setString(2,name);
    ps.setInt(3,age);
    ps.setString(4,sex);
    ps.executeUpdate();
   // 4、遍历结果集：此处插入记录不需要
   // 5、关闭资源对象
    ps.close();
    getConnection().close();
}
	/*public  void update(String id,String name,int age,String sex) throws ClassNotFoundException, SQLException {
	    // 定义sql语句
	     String sql="UPDATE STUDENTMANAGE SET STUDENTNAME=?,AGE=?,SEX=? where STUDENTID=?";
	    // 3、创建语句对象
	     ps=getConnection().prepareStatement(sql);
	     ps.setString(1,name);
	     ps.setInt(2,age);
	     ps.setString(3,sex);
	     ps.setString(4,id);
	     ps.executeUpdate();
	   // 4、遍历结果集：此处插入记录不需要
	    // 5、关闭资源对象
	     ps.close();
	     getConnection().close();
	}
	public  void delete(String id) throws ClassNotFoundException, SQLException {
	    // 定义sql语句
	     String sql="DELETE STUDENTMANAGE WHERE STUDENTID=?";
	    // 3、创建语句对象
	     ps=getConnection().prepareStatement(sql);
	     ps.setString(1,id);
	   // 4、遍历结果集：此处插入记录不需要
	    // 5、关闭资源对象
	     ps.close();
	     getConnection().close();
	}*/
	public String get(String id) throws ClassNotFoundException, SQLException {
	    // 定义sql语句
	     String sql="SELECT STUDENTID,STUDENTNAME,AGE,SEX FROM STUDENTMANAGE WHERE STUDENTID=?";
	    // 3、创建语句对象
	     ps=getConnection().prepareStatement(sql);
	     ps.setString(1,id);
	     ResultSet rs = ps.executeQuery();
	     while(rs.next()){
	    	 id=rs.getString("STUDENTID");
	    	 name=rs.getString("STUDENTNAME");
	    	 age=rs.getInt("AGE");
	    	 sex=rs.getString("SEX");
	     }
	   // 4、遍历结果集：此处插入记录不需要
	    // 5、关闭资源对象
	     ps.close();
	     getConnection().close();
	     return "学号："+id+" 姓名："+name+" 年龄 ："+age+"  性别："+sex;
	}
	public void get() throws ClassNotFoundException, SQLException {

	}
public static void main(String[] args) throws ClassNotFoundException,SQLException {
	//JDBCTest jt=new JDBCTest();
     //jt.add();
    //jt.update();
	//jt.delete();
}

}