<?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>
    <settings>  
            <!-- 打开延迟加载的开关 -->  
            <setting name="lazyLoadingEnabled" value="true" />  
            <!-- 将积极加载改为消息加载即按需加载 -->  
            <setting name="aggressiveLazyLoading" value="false"/>
            <setting name="cacheEnabled" value="true"/>
        </settings>    
    <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"/>  
        <mapper class="com.how2java.mapper.ProductMapper"/>  
    </mappers>
</configuration>

<?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">
		<cache/>
	    <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>

package com.how2java.pojo;
 
import java.io.Serializable;
import java.util.List;
 
public class Category implements Serializable{
    private int id;
    private String name;
    List<Product> products;
    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;
    }
    public List<Product> getProducts() {
        return products;
    }
    public void setProducts(List<Product> products) {
        this.products = products;
    }
    @Override
    public String toString() {
        return "Category [id=" + id + ", name=" + name + "]";
    }
     
}