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  • mybatis之分页查询

    1)StudentDao.java

    /**
     * 持久层*/
    public class StudentDao {
        /**
         * 增加学生
         */
        public void add(Student student) throws Exception{
            SqlSession sqlSession = MyBatisUtil.getSqlSession();
            try{
                sqlSession.insert("mynamespace.add",student);
            }catch(Exception e){
                e.printStackTrace();
                sqlSession.rollback();
                throw e;
            }finally{
                sqlSession.commit();
                MyBatisUtil.closeSqlSession();
            }
        }
        /**
         * 无条件分页查询学生
         */
        public List<Student> findAllWithFy(int start,int size) throws Exception{
            SqlSession sqlSession = MyBatisUtil.getSqlSession();
            try{
                Map<String,Integer> map = new LinkedHashMap<String,Integer>();
                map.put("pstart",start);
                map.put("psize",size);
                return sqlSession.selectList("mynamespace.findAllWithFy",map);
            }catch(Exception e){
                e.printStackTrace();
                sqlSession.rollback();
                throw e;
            }finally{
                sqlSession.commit();
                MyBatisUtil.closeSqlSession();
            }
        }
        /**
         * 有条件分页查询学生
         */
        public List<Student> findAllByNameWithFy(String name,int start,int size) throws Exception{
            SqlSession sqlSession = MyBatisUtil.getSqlSession();
            try{
                Map<String,Object> map = new LinkedHashMap<String,Object>();
                map.put("pname","%"+name+"%");
                map.put("pstart",start);
                map.put("psize",size);
                return sqlSession.selectList("mynamespace.findAllByNameWithFy",map);
            }catch(Exception e){
                e.printStackTrace();
                sqlSession.rollback();
                throw e;
            }finally{
                sqlSession.commit();
                MyBatisUtil.closeSqlSession();
            }
        }
        public static void main(String[] args) throws Exception{
            StudentDao dao = new StudentDao();
            System.out.println("-----------Page1");
            for(Student s:dao.findAllByNameWithFy("哈",0,3)){
                System.out.println(s.getId()+":"+s.getName()+":"+s.getSal());
            }
            System.out.println("-----------Page2");
            for(Student s:dao.findAllByNameWithFy("哈",3,3)){
                System.out.println(s.getId()+":"+s.getName()+":"+s.getSal());
            }
            System.out.println("-----------Page3");
            for(Student s:dao.findAllByNameWithFy("哈",6,3)){
                System.out.println(s.getId()+":"+s.getName()+":"+s.getSal());
            }
            System.out.println("-----------Page4");
            for(Student s:dao.findAllByNameWithFy("哈",9,3)){
                System.out.println(s.getId()+":"+s.getName()+":"+s.getSal());
            }
        }
    }

    2StudentMapper.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="mynamespace">
        <insert id="add" parameterType="loaderman.Student">
            insert into students(id,name,sal) values(#{id},#{name},#{sal})
        </insert>
        <select id="findAllWithFy" parameterType="map" resultType="loaderman.Student">
            select id,name,sal from students limit #{pstart},#{psize}
        </select>
        <select id="findAllByNameWithFy" parameterType="map" resultType="loaderman.Student">
            select id,name,sal from students where name like #{pname} limit #{pstart},#{psize}
        </select>
    </mapper>

    /**

     *持久层

     *@authorAdminTC

     */

    publicclass StudentDao {

        /**

         *增加学生

         */

        publicvoid add(Student student) throws Exception{

           SqlSession sqlSession = MyBatisUtil.getSqlSession();

           try{

               sqlSession.insert("mynamespace.add",student);

           }catch(Exception e){

               e.printStackTrace();

               sqlSession.rollback();

               throw e;

           }finally{

               sqlSession.commit();

               MyBatisUtil.closeSqlSession();

           }

        }

        /**

         *无条件分页查询学生

         */

        public List<Student> findAllWithFy(int start,int size) throws Exception{

           SqlSession sqlSession = MyBatisUtil.getSqlSession();

           try{

               Map<String,Integer> map = new LinkedHashMap<String,Integer>();

               map.put("pstart",start);

               map.put("psize",size);

               return sqlSession.selectList("mynamespace.findAllWithFy",map);

           }catch(Exception e){

               e.printStackTrace();

               sqlSession.rollback();

               throw e;

           }finally{

               sqlSession.commit();

               MyBatisUtil.closeSqlSession();

           }

        }

        /**

         *有条件分页查询学生

         */

        public List<Student> findAllByNameWithFy(String name,int start,int size) throws Exception{

           SqlSession sqlSession = MyBatisUtil.getSqlSession();

           try{

               Map<String,Object> map = new LinkedHashMap<String,Object>();

               map.put("pname","%"+name+"%");

               map.put("pstart",start);

               map.put("psize",size);

               return sqlSession.selectList("mynamespace.findAllByNameWithFy",map);

           }catch(Exception e){

               e.printStackTrace();

               sqlSession.rollback();

               throw e;

           }finally{

               sqlSession.commit();

               MyBatisUtil.closeSqlSession();

           }

        }

        publicstaticvoid main(String[] args) throws Exception{

           StudentDao dao = new StudentDao();

           System.out.println("-----------Page1");

           for(Student s:dao.findAllByNameWithFy("",0,3)){

               System.out.println(s.getId()+":"+s.getName()+":"+s.getSal());

           }

           System.out.println("-----------Page2");

           for(Student s:dao.findAllByNameWithFy("",3,3)){

               System.out.println(s.getId()+":"+s.getName()+":"+s.getSal());

           }

           System.out.println("-----------Page3");

           for(Student s:dao.findAllByNameWithFy("",6,3)){

               System.out.println(s.getId()+":"+s.getName()+":"+s.getSal());

           }

           System.out.println("-----------Page4");

           for(Student s:dao.findAllByNameWithFy("",9,3)){

               System.out.println(s.getId()+":"+s.getName()+":"+s.getSal());

           }

        }

    }

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  • 原文地址:https://www.cnblogs.com/loaderman/p/10064432.html
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