Mybatis 分页

Mybatis-config.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <typeAliases>
        <package name="com.how2java.pojo"/>
    </typeAliases>
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/how2java?characterEncoding=UTF-8"/>
                <property name="username" value="root"/>
                <property name="password" value="admin"/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <mapper resource="com/how2java/pojo/Category.xml"/>
        <mapper class="com.how2java.mapper.CategoryMapper"/>
    </mappers>
</configuration>

CategoryMapper.java

package com.how2java.mapper;

import java.util.List;

import org.apache.ibatis.annotations.Many;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Result;
import org.apache.ibatis.annotations.Results;
import org.apache.ibatis.annotations.Select;

import com.how2java.pojo.Category;

public interface CategoryMapper {
    @Select(" select * from category_ ")
    @Results({@Result(property = "products", javaType = List.class, column = "id",
            many = @Many(select = "com.how2java.mapper.ProductMapper.listByCategory"))})
    public List<Category> list();

    @Select(" select * from category_ limit #{start},#{count}")
    public List<Category> listByPage(@Param("start") int start, @Param("count")int count);
}

Category.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="com.how2java.pojo">
    <insert id="addCategory" parameterType="Category" >
            insert into category_ ( name ) values (#{name})
        </insert>

    <delete id="deleteCategory" parameterType="Category" >
            delete from category_ where id= #{id}
        </delete>

    <select id="getCategory" parameterType="_int" resultType="Category">
            select * from   category_  where id= #{id}
        </select>

    <update id="updateCategory" parameterType="Category" >
            update category_ set name=#{name} where id=#{id}
        </update>
    <select id="listCategory" resultType="Category">
            select * from   category_
        <if test="start!=null and count!=null">
            limit #{start},#{count}
        </if>
        </select>
</mapper>

Category.java

package com.how2java.pojo;

import java.util.List;

public class Category {
    private int id;
    private String name;
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    @Override
    public String toString() {
        return "Category [id=" + id + ", name=" + name + "]";
    }

}

TestMybatis.java

package com.how2java;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import com.how2java.mapper.CategoryMapper;
import com.how2java.pojo.Category;

public class TestMybatis {

    public static void main(String[] args) throws IOException {
        String resource = "mybatis-config.xml";
        InputStream inputStream = Resources.getResourceAsStream(resource);
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        SqlSession session = sqlSessionFactory.openSession();

//        xmlWay(session);
        annotationWay(session);

        session.commit();
        session.close();
    }

    private static void xmlWay(SqlSession session) {
        Map<String,Object> params = new HashMap<>();
        params.put("start", 0);
        params.put("count", 5);
        List<Category>  cs =session.selectList("listCategory", params);
        for (Category c : cs) {
            System.out.println(c);
        }
    }

    private static void annotationWay(SqlSession session) {
        CategoryMapper mapper = session.getMapper(CategoryMapper.class);

        List<Category>  cs = mapper.listByPage(0, 5);
        for (Category c : cs) {
            System.out.println(c);
        }
    }

}