fix:在sql中使用or

src/main/resources/mapper/UserMapper.xml

@@ -24,13 +24,13 @@
                     id <= 1
                 </if>
                 <if test="flag==2">
-                    id &gt;= 2 and id &lt; 4
+                    (id &gt;= 2 and id &lt; 4)
                 </if>
                 <if test="flag==3">
-                    id &gt;= 5 and id &lt; 6
+                    ( id &gt;= 5 and id &lt; 6)
                 </if>
                 <if test="flag==4">
-                    id &gt;= 8 and id &lt; 9
+                    ( id &gt;= 8 and id &lt; 9)
                 </if>
             </foreach>
         </if>