The difference between # and $ in MyBatis

Yesterday there was an article about pagination and sorting, and a question left over from the article was not solved.

Today I re-read the next source to do the test! Discover the approximate solution to yesterday's problem!

<if test= "Page.sort! = null" >        <foreach collection= "Page.sort" index= "index" item= "order" >            Order by ${order.property} ${order.direction}        </foreach></if>

The process of executing the above code is outlined below:

The following picture is the SQL statement of the query is parsed and has been assigned a value

There is no direct assignment here, but to parse him out? This form, which is prepared for pre-compilation

In the case of precompilation, use # or $ as mapper.xml and for non-precompiled is handled using $.

The difference between # and $ in MyBatis