private Integer categoryId;private String categoryName;private Integer isRoot;private Integer categoryLevel;private Integer rootCategoryId;private Integer parentCategoryId;private String parentCategoryName;

public List<TCategory>childList=new ArrayList<TCategory>();//子Category列表

<!-- 带有chlidList的map --><resultMap id="TreeMap" type="com.qgranite.entity.TCategory"><id column="category_id" property="categoryId" jdbcType="INTEGER" /><result column="category_name" property="categoryName"jdbcType="VARCHAR" /><result column="category_remark" property="categoryRemark"jdbcType="VARCHAR" /><result column="category_type" property="categoryType"jdbcType="INTEGER" /><result column="is_root" property="isRoot" jdbcType="INTEGER" /><result column="category_level" property="categoryLevel"jdbcType="INTEGER" /><result column="root_category_id" property="rootCategoryId"jdbcType="INTEGER" /><result column="parent_category_id" property="parentCategoryId"jdbcType="INTEGER" /><result column="parent_category_name" property="parentCategoryName"jdbcType="VARCHAR" /><collection property="childList" column="category_id"ofType="com.qgranite.entity.TCategory" select="selectRecursionByParentCategoryId"></collection></resultMap>

<!-- 根据父键递归查询 --><select id="selectRecursionByParentCategoryId" resultMap="TreeMap"parameterType="java.lang.Integer">select*from t_categorywhere is_del=0andparent_category_id=#{_parameter,jdbcType=INTEGER}</select>

<!-- 递归查询所有 --><select id="selectRecursionAll" resultMap="TreeMap">select*from t_categorywhere is_del=0andcategory_type=1</select>

/*** 根据特定父类递归查询所有子类* * @param categoryId* @return*/public List<TCategory> allCategoryRecursion() {return baseDao.findTList("TCategoryMapper.selectRecursionAll");}

/*** 根据特定父类递归查询所有子类* * @param categoryId* @return */ public List<TCategory> subCategoryListByParentId(int categoryId) { return baseDao .findTListByParam( "TCategoryMapper.selectRecursionByParentCategoryId", categoryId); }

/*** 根据categoryId获取子孙categoryId的id字符串，用逗号隔开* * @param categoryId* @return*/public String subCategoryStrByParentId(Integer categoryId) {String categoryStr = categoryId.toString();List<TCategory> categoryList = baseDao.findTListByParam("TCategoryMapper.selectRecursionByParentCategoryId",categoryId);int size = categoryList.size();for (int i = 0; i < size; i++) {TCategory category = categoryList.get(i);categoryStr = categoryStr + "," + category.getCategoryId();if (!category.getChildList().isEmpty()) {Iterator<TCategory> it = category.getChildList().iterator();while (it.hasNext()) {categoryStr = categoryStr + "," + it.next().getCategoryId();}}}return categoryStr;}

package com.qgranite.dao;import java.io.Serializable;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.List;import javax.annotation.Resource;import org.mybatis.spring.SqlSessionTemplate;
import org.springframework.stereotype.Repository;/*** 所有dao基类* * @author xdx** @param <T>* @param <PK>*/
@Repository("baseDao")
public class BaseDao<T, PK extends Serializable> {private Class<T> enetityClass;@Resource(name = "sqlSessionTemplate")private SqlSessionTemplate sqlSessionTemplate;// 构造方法，根据实例类自动获取实体类型,这边利用java的反射public BaseDao() {this.enetityClass = null;Class c = getClass();Type t = c.getGenericSuperclass();if (t instanceof ParameterizedType) {ParameterizedType p = (ParameterizedType) t;Type[] type = p.getActualTypeArguments();this.enetityClass = (Class<T>) type[0];}}/*** 获取实体* * @param id* @return*/public T getT(String sql, Object param) {return sqlSessionTemplate.selectOne(sql, param);}/*** 不带查询参数的列表* @param str* @return* @throws Exception*/public List<T> findTList(String sql){return sqlSessionTemplate.selectList(sql);}/*** 带有参数的列表* * @param str* @param param* @return* @throws Exception*/public List<T> findTListByParam(String sql, Object param) {return sqlSessionTemplate.selectList(sql, param);}/*** 插入一条数据,参数是t* * @param sql* @param t* @return*/public int addT(String sql, T t) {return sqlSessionTemplate.insert(sql, t);}/*** 修改一条数据，参数是t* @param sql* @param t* @return*/public int updateT(String sql,T t){return sqlSessionTemplate.update(sql, t);}/*** 删除t,参数是主键* @param sql* @param t* @return*/public int deleteT(String sql,PK pk){return sqlSessionTemplate.delete(sql, pk);}/*** 根据param获取一个对象* @param sql* @param param* @return*/public Object getObject(String sql,Object param){return sqlSessionTemplate.selectOne(sql,param);}
}