PreparedStatement conn（sql）中sql语句正确但是却不能执行

public boolean addGoods(ShopShow shopshow)  {
		boolean flag = false;
		
		try {
			String sql="insert into goodscar(id,name,dustry,price,number) values('"+shopshow.getId()+"','"+shopshow.getName()+"','"+shopshow.getDustry()+"','"+shopshow.getPrice()+"','"+shopshow.getNumber()+"');";
			PreparedStatement pstmt = conn.prepareStatement(sql);
			int i = pstmt.executeUpdate();
		
			pstmt.close();
			conn.close();
			if(i>0) {
				flag = true;
			}
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return flag;
		

INSERT INTO goodscar VALUES('2','小米2','三小只','11','1');我打了断点获取了sql的值粘贴到数据库中运行时是可以插入数据的。但是在javaEE中运行flag返回值是false。这让我百思不得其解

报错了