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概述:
当希望能直接在数据库语言中只检索符合条件的记录,不需要再通过程序对其做处理时,SQL语句分页技术便横空出世了,通过SQL语句实现分页只需要改变查询语句就能实现,即在SQL语句后面添加limit分页语句。
说白了MySql对分页的支持是通过limit子语句来实现的。
limit语句的用法如下:
LIMIT [office,] rows(其中office指相对于首行的偏移量(首行为0),rows指返回记录条数)
一般用法:
使用到的是学生表,持久化Student类,使用注解方式试用一下。
student表:
Student.java
StudentMapper.xml
StudentService.java
StudentServiceImpl.java
AppTest.java
测试结果:
确实返回了5条数据
三. 使用分页参数RowBound
Mybatis框架不仅支持分页,它还内置了一个专门处理分页的类——rowBounds。
修改:
StudentMapper.xml
@Select("SELECT * from student") List<Student> getStudentByPage2(RowBounds
rowBounds);
AppTest.java
RowBounds就是一个封装了offset和limit的简单类,只需要这两步就能轻松实现分页效果了。