mybatis(3)分页查询和条件分页查询

mybatis.xml，db.properties,MybatisUtil.java,student.java和第一篇文章一样,所建的表也是一样的

StudentDao.java

/** * 持久层  * @author AdminTC */public class StudentDao {/** * 增加学生 */public void add(Student student) throws Exception{SqlSession sqlSession = null;try{sqlSession = MybatisUtil.getSqlSession();sqlSession.insert(Student.class.getName()+".add",student);sqlSession.commit();}catch(Exception e){e.printStackTrace();sqlSession.rollback();throw e;}finally{MybatisUtil.closeSqlSession();}}/** * 无条件分页 * @param start 表示在mysql中从第几条记录的索引号开始显示，索引从0开始 * @param size 表示在mysql中最多显示几条记录 */public List<Student> findAllWithFy(int start,int size) throws Exception{SqlSession sqlSession = null;try{sqlSession = MybatisUtil.getSqlSession();Map<String,Object> map = new LinkedHashMap<String,Object>();map.put("pstart",start);map.put("psize",size);return sqlSession.selectList(Student.class.getName()+".findAllWithFy",map);}catch(Exception e){e.printStackTrace();throw e;}finally{MybatisUtil.closeSqlSession();}}/** * 有条件分页 */public List<Student> findAllByNameWithFy(String name,int start,int size) throws Exception{SqlSession sqlSession = null;try{sqlSession = MybatisUtil.getSqlSession();Map<String,Object> map = new LinkedHashMap<String, Object>();map.put("pname","%"+name+"%");map.put("pstart",start);map.put("psize",size);return sqlSession.selectList(Student.class.getName()+".findAllByNameWithFy",map);}catch(Exception e){e.printStackTrace();throw e;}finally{MybatisUtil.closeSqlSession();}}public static void main(String[] args) throws Exception{StudentDao dao = new StudentDao();//for(int i=1;i<=10;i++){//dao.add(new Student(i,"哈哈",7000D));//}System.out.println("--------------------第一页");List<Student> studentList1 = dao.findAllByNameWithFy("哈",0,3);for(Student s : studentList1){System.out.println(s.getId()+":"+s.getName()+":"+s.getSal());}System.out.println("--------------------第二页");List<Student> studentList2 = dao.findAllByNameWithFy("哈",3,3);for(Student s : studentList2){System.out.println(s.getId()+":"+s.getName()+":"+s.getSal());}System.out.println("--------------------第三页");List<Student> studentList3 = dao.findAllByNameWithFy("哈",6,3);for(Student s : studentList3){System.out.println(s.getId()+":"+s.getName()+":"+s.getSal());}}}

StudentMapper.xml

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd"><mapper namespace="cn.itcast.javaee.mybatis.app10.Student"><resultMap type="cn.itcast.javaee.mybatis.app10.Student" id="studentMap"><id property="id" column="students_id"/><result property="name" column="students_name"/><result property="sal" column="students_sal"/></resultMap><insert id="add" parameterType="cn.itcast.javaee.mybatis.app10.Student">insert into students(students_id,students_name,students_sal) values(#{id},#{name},#{sal});</insert><select id="findAllWithFy" parameterType="map" resultMap="studentMap">select students_id,students_name,students_sal from students limit #{pstart},#{psize}</select><select id="findAllByNameWithFy" parameterType="map" resultMap="studentMap">select students_id,students_name,students_sal from students where students_name like #{pname}limit #{pstart},#{psize}</select></mapper>