1.$和#区分
1 #是将传入的值当作字符串的情势,eg:select id,name,age from student where id =#{id},当前端把id值1,传入到后台的时候,就相当于 select id,name,age from student where id ="1".1 #是将传入的值当作字符串的情势,eg:select id,name,age f
1.$和#区分
1 #是将传入的值当作字符串的情势,eg:select id,name,age from student where id =#{id},当前端把id值1,传入到后台的时候,就相当于 select id,name,age from student where id ="1".1 #是将传入的值当作字符串的情势,eg:select id,name,age f