jdbc查询数据

package com.daqing.test;

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

import com.daqing.jdbc.A0101JdbcUtils;

public class TestRead01 {

	private Connection conn = null;
	private PreparedStatement ps = null;
	private Statement st = null;
	private ResultSet rs = null;
	
	public static void main(String[] args) throws SQLException {
		long start = System.currentTimeMillis();//开始时间
		new TestRead01().readPreparedStatement("daqing1");
		long end = System.currentTimeMillis();//结束时就爱你
		System.out.println("time:"+(end-start));//开始时间减去结束时间等于执行时间
		
		start = System.currentTimeMillis();//开始时间
		new TestRead01().readStatement("'or 1 or'");
		end = System.currentTimeMillis();//结束时就爱你
		System.out.println("time:"+(end-start));//开始时间减去结束时间等于执行时间
	}
	
	public void readPreparedStatement(String name) throws SQLException{
		String sql = "select * from user where name=?";
		conn = A0101JdbcUtils.getConnection();
		ps = conn.prepareStatement(sql);
		ps.setString(1, name);
		rs = ps.executeQuery();
		while(rs.next()){
			System.out.println(rs.getObject(1)+"\t"+rs.getObject(2)+"\t"+rs.getObject(3));
		}
		A0101JdbcUtils.free(rs, ps, conn);
	}
	
	public void readStatement(String name) throws SQLException{
		String sql = "select * from user where name='"+name+"'";
		conn = A0101JdbcUtils.getConnection();
		st = conn.createStatement();
		rs = st.executeQuery(sql);
		while(rs.next()){
			System.out.println(rs.getObject(1)+"\t"+rs.getObject(2)+"\t"+rs.getObject(3));
		}
	}
}