SQL：select * from students where name like ‘%tommy%‘;

正常的sql如上，是可以直接执行的，

那放到java的P热怕热的Statement中就应该是：

//同时把tommy改成通配符？

PreparedStatement pstmt1 = conn.prepareStatement("select * from student where name like ‘%?%‘");

pstmt1.setString(1,"tommy");//这里居然不通过

解决方法一：使用拼接字符串

PreparedStatement pstmt1 = conn.prepareStatement("select * from student where name like ‘%"+tommy+"%‘");

解决方法二：灵活变通(其实就是通配符？不能放在‘‘单引号中)

PreparedStatement pstmt1 = conn.prepareStatement("select * from student where name like ?");

pstmt1.setString(1,"%"+"tommy"+"%");//这里居然不通过

java的PreparedStatement中使用like时的问题