JDBCのCRUD操作のPreparedStatementの修正操作

        @Test
	/**
	 *     
	 */
	public void demo2(){
		Connection conn = null;
		PreparedStatement pstmt = null;
		try{
			//     :
			conn = JDBCUtils.getConnection();
			//   SQL  :
			String sql = "update user set username = ?,password =?,nickname=?,age = ? where id = ?";
			//    SQL:
			pstmt = conn.prepareStatement(sql);
			//     :
			pstmt.setString(1, "abc");
			pstmt.setString(2, "1234");
			pstmt.setString(3, "  ");
			pstmt.setInt(4, 23);
			pstmt.setInt(5, 6);
			//   SQL：
			int num = pstmt.executeUpdate();
			if(num > 0){
				System.out.println("    ！");
			}
		}catch(Exception e){
			e.printStackTrace();
		}finally{
			JDBCUtils.release(pstmt, conn);
		}
	}