JdbcTemplate的DML，DQL操作

JdbcTemplate类主要用来减少daoimpl的代码量

public static int update(String sql,Object...params) {
		Connection conn=null;
		PreparedStatement ps=null;
		try {
			conn=DruidUtil.getConn();
			ps=conn.prepareStatement(sql);
			//设置占位符
			for(int index=0;index

public static List query(String sql,Object...params){
		List list=new ArrayList<>();
		Connection conn=null;
		PreparedStatement ps=null;
		ResultSet rs=null;
		try {
			conn=DruidUtil.getConn();
			ps=conn.prepareStatement(sql);
			//设置占位符
			for(int index=0;index

public Student get(Long id)  {
		List list=JdbcTemplate.query("select * from t_student where id=?", id);
		if(list.size()==1) {
			return list.get(0);
		}
		return null;
		
	}