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JdbcTemplate查询返回JavaBean的几种方法

关于JdbcTemplate的官方描述如下：

org.springframework.jdbc.core.JdbcTemplate

大约的讲，将JdbcTemplate返回的list结果集生成JavaBean我找到四种方式，都还不错。

本例比较特殊，该JavaBean里面包含一个child属性，该属性类型为List，见代码，而查询父子的SQL及需要的结果完全不同。

见代码

UserFuncEntity

package com.jpaandsecurity.entity;


import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.annotation.JSONField;
import lombok.Getter;
import lombok.Setter;

import javax.persistence.Column;
import java.io.Serializable;
import java.util.List;

@Getter
@Setter
public class UserFuncEntity implements Serializable {
    private static final long serialVersionUID = -816647127390476012L;

    @JSONField(ordinal = 1)
    @Column(name = "RESPONSIBILITY_NAME")
    private String name;
    @JSONField(ordinal = 2)
    private List<UserFuncEntity> child;
    @JSONField(ordinal = 3)
    private String controller;
    @JSONField(ordinal = 4)
    private String req_mapping;
    @JSONField(ordinal = 5)
    @Column(name = "RESPONSIBILITY_ID")
    private String resp_id;
    @JSONField(ordinal = 6)
    private String responsibility_name;
    @JSONField(ordinal = 7)
    @Column(name = "RESPONSIBILITY_APPLICATION_ID")
    private String resp_appl_id;
    @JSONField(ordinal = 8)
    @Column(name = "PROMPT")
    private String functionPrompt;
    @JSONField(ordinal = 9)
    private String params;

    public UserFuncEntity(){
        super();
    }

    public UserFuncEntity(String name,List<UserFuncEntity> child,String controller,String req_mapping,String resp_id,String resp_appl_id,String params){
        super();
        this.name = name;
        this.child = child;
        this.controller = controller;
        this.req_mapping = req_mapping;
        this.resp_id = resp_id;
        this.resp_appl_id = resp_appl_id;
        this.params = params;
    }

    public String getController() {
        if(getReq_mapping()!=null && getResp_appl_id()!=null && getResp_id()!=null){

            return "/init_responsiblity?req_mapping="+getReq_mapping()+"&resp_id="+getResp_id()+"&resp_appl_id="+getResp_appl_id()+"&params="+getParams();
        }else{
            return controller;
        }
    }

    @Override
    public String toString(){
        return JSON.toJSONString(this);
    }

}

UserResponEntity

package com.jpaandsecurity.entity;

import lombok.Getter;
import lombok.Setter;
import org.springframework.jdbc.core.RowMapper;


import java.io.Serializable;
import java.sql.ResultSet;
import java.sql.SQLException;

@Getter
@Setter
public class UserResponEntity implements RowMapper<UserResponEntity>, Serializable {
    private String respId;
    private String responsibilityApplicationId;
    private String responsibilityName;
    private String prompt;

    public UserResponEntity(){
        super();
    }

    public UserResponEntity(String responsibilityId,String responsibilityApplicationId,String responsibilityName,String prompt){
        this.respId = responsibilityId;
        this.responsibilityApplicationId = responsibilityApplicationId;
        this.responsibilityName = responsibilityName;
        this.prompt = prompt;
    }

    @Override
    public UserResponEntity mapRow(ResultSet rs, int rowNum) throws SQLException {
        UserResponEntity userResponEntity = new UserResponEntity();
        userResponEntity.setRespId(rs.getString("responsibility_id"));
        userResponEntity.setResponsibilityApplicationId(rs.getString("responsibility_application_id"));
        userResponEntity.setResponsibilityName(rs.getString("responsibility_name"));
        return  userResponEntity;
    }
}

SpringTest

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.serializer.SerializerFeature;
import com.jpaandsecurity.RunApplication;
import com.jpaandsecurity.entity.UserFuncEntity;
import com.jpaandsecurity.entity.UserResponEntity;
import lombok.extern.slf4j.Slf4j;
import org.apache.catalina.User;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Repository;
import org.springframework.test.context.junit4.SpringRunner;

import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;
import java.util.*;

import static com.jpaandsecurity.entity.ReflectUtil.reflect;

@Slf4j
@SpringBootTest(classes = {RunApplication.class})
@RunWith(SpringRunner.class)
@Component
public class QueryTest {
    @PersistenceContext
    private EntityManager em;

    @Autowired
    private JdbcTemplate jdbcTemplate;

    @Test
    public void testQuery(){

        List<UserFuncEntity> menuList = new LinkedList<UserFuncEntity>();
        String respId = null;
        String respApplId = null;
        String respName = null;
        String name = null;

        long startTime = System.currentTimeMillis();
        String sql = "SELECT furg.responsibility_id,
" +
                "       furg.responsibility_application_id,
" +
                "       frv.responsibility_name
" +
                "  FROM fnd_user_resp_groups_all furg, fnd_responsibility_vl frv
" +
                " WHERE furg.user_id = ? 
"+
                "   AND furg.responsibility_id = frv.responsibility_id" +
                "   AND SYSDATE BETWEEN furg.start_date AND nvl(furg.end_date, SYSDATE + 1)";
        String userId = String.valueOf(1131);

        String respFuncSql = "SELECT res.responsibility_name,
" +
                "       menu.menu_name,
" +
                "       menu.user_menu_name,
" +
                "       func.function_name,
" +
                "       func.user_function_name,
" +
                "       sub_menu.prompt,
" +
                "       func.type
" +
                "  FROM fnd_responsibility_vl res,
" +
                "       fnd_menus_vl          menu,
" +
                "       fnd_menu_entries_vl   sub_menu,
" +
                "       fnd_form_functions_vl func
" +
                " WHERE res.menu_id = sub_menu.menu_id
" +
                "   AND menu.menu_id = sub_menu.menu_id
" +
                "   AND sub_menu.function_id = func.function_id
" +
                "   AND sub_menu.sub_menu_id IS NULL
" +
                "   AND sub_menu.function_id IS NOT NULL
" +
                "   AND sub_menu.prompt IS NOT NULL
" +
                "   AND func.function_name NOT IN
" +
                "       ('FNDCPSRSSSWA', 'FNDCPVIEWREQUEST', 'ICX_SSWA_USER_PREFERENCES')"+
                "   AND func.type = 'JSP'
" +
                "   AND res.RESPONSIBILITY_ID = ? 
" +
                "UNION 
" +
                "SELECT res.responsibility_name,
" +
                "       menu.menu_name,
" +
                "       menu.user_menu_name,
" +
                "       func.function_name,
" +
                "       func.user_function_name,
" +
                "       sub_menu1.prompt,
" +
                "       func.type
" +
                "  FROM fnd_responsibility_vl res,
" +
                "       fnd_menus_vl          menu,
" +
                "       fnd_menu_entries_vl   sub_menu,
" +
                "       fnd_menu_entries_vl   sub_menu1,
" +
                "       fnd_form_functions_vl func
" +
                " WHERE res.menu_id = sub_menu.menu_id
" +
                "   AND sub_menu.menu_id = menu.menu_id
" +
                "   AND sub_menu.sub_menu_id = sub_menu1.menu_id
" +
                "   AND sub_menu1.function_id = func.function_id
" +
                "   AND sub_menu.sub_menu_id IS NOT NULL
" +
                "   AND sub_menu.function_id IS NULL
" +
                "   AND sub_menu1.prompt IS NOT NULL
" +
                "   AND func.function_name NOT IN
" +
                "       ('FNDCPSRSSSWA', 'FNDCPVIEWREQUEST', 'ICX_SSWA_USER_PREFERENCES')"+
                "   AND func.type = 'JSP'
" +
                "   AND res.RESPONSIBILITY_ID = ?";
        startTime = System.currentTimeMillis();

        //jdbcTemplate中几个常用query的使用解释
        //https://blog.csdn.net/hjm4702192/article/details/39997379


        //方法1，普通，使用最原始的QueryForList
        List<Map<String, Object>> rows = jdbcTemplate.queryForList(sql,new Object[]{ userId });
        Iterator it = rows.iterator();
        while(it.hasNext()) {
            Map respMap = (Map) it.next();
            respId = String.valueOf( respMap.get("responsibility_id".toUpperCase()));
            respApplId = String.valueOf( respMap.get("responsibility_application_id".toUpperCase()));
            respName = String.valueOf( respMap.get("responsibility_name".toUpperCase()));
            name = respName;
            if(respName.startsWith("B18")){
                name = respName.substring(10);
            }
            UserFuncEntity userFuncEntity = new UserFuncEntity();
            userFuncEntity.setResp_id(respId);
            userFuncEntity.setResp_appl_id(respApplId);
            userFuncEntity.setName(name);

            List<UserFuncEntity> childList = new ArrayList<>();
            List funcRows = jdbcTemplate.queryForList(respFuncSql,new Object[]{respId, respId});

            Iterator funcIt = funcRows.iterator();
            //判断职责下是否有可用的功能
            int i=0;
            while (funcIt.hasNext()){
                Map funcMap = (Map) funcIt.next();
                name = String.valueOf(funcMap.get("prompt"));
                UserFuncEntity funcEntity = new UserFuncEntity();
                funcEntity.setResp_id(respId);
                funcEntity.setResp_appl_id(respApplId);
                funcEntity.setName(name);
                if(i%2==0)
                    funcEntity.setReq_mapping("/test");
                else
                    funcEntity.setReq_mapping("/echart");
                childList.add(funcEntity);
                i++;
            }
            if(i==0)
                continue;

            userFuncEntity.setChild(childList);

            menuList.add(userFuncEntity);
        }

        log.info("jdbcTemplate方法1消耗时长"+(System.currentTimeMillis()-startTime)+"rows.size "+rows.size());


        //方法二，使用反射
        //方法3和4不太适合本次两个SQL返回至同一个bean的情况
        //https://blog.csdn.net/will_awoke/article/details/12617383
        //https://blog.csdn.net/will_awoke/article/details/27683703
//        List<UserFuncEntity> menuList = new LinkedList<UserFuncEntity>();
//        menuList = new LinkedList<UserFuncEntity>();
        startTime = System.currentTimeMillis();
        menuList.clear();
        for (Map<String, Object> jdbcMapResult : rows)
        {
            UserFuncEntity userRespon =reflect(UserFuncEntity.class, jdbcMapResult);
            List<Map<String, Object>> responFuncMenu =jdbcTemplate.queryForList(respFuncSql,new Object[]{userRespon.getResp_id(),
                                                                                                          userRespon.getResp_id()});

            List<UserFuncEntity> respFuncList = new LinkedList<UserFuncEntity>();
            int i=0;
            for (Map<String, Object> respFuncListMap: responFuncMenu){
                UserFuncEntity func = reflect(UserFuncEntity.class, respFuncListMap);
                func.setResp_id(userRespon.getResp_id());
                func.setResp_appl_id(userRespon.getResp_appl_id());
                if(i%2==0)
                    func.setReq_mapping("/test");
                else
                    func.setReq_mapping("/echart");
                i++;
                respFuncList.add(func);
            }
            userRespon.setChild(respFuncList);
            //利用工具类反向生成bean
            menuList.add(userRespon);
        }
        log.info("jdbcTemplate方法2消耗时长"+(System.currentTimeMillis()-startTime)+"rows.size "+rows.size());
        log.info("jdbcTemplate方法2消耗时长 "+(System.currentTimeMillis()-startTime)+"
"+JSON.toJSONString(menuList,SerializerFeature.PrettyFormat));


//方法三，继承RowMapper接口进行实现
        //该方法已经不适合两个不同的SQL需要返回至同一个JavaBean的情况。
        //https://blog.csdn.net/fengshizty/article/details/43309055
        //https://blog.csdn.net/u011332918/article/details/45560117
        startTime = System.currentTimeMillis();
        List<UserResponEntity> list = jdbcTemplate.query(sql,new  UserResponEntity(),new Object[]{userId});

        log.info(JSON.toJSONString(list,SerializerFeature.PrettyFormat));
        log.info(" list  长度"+list.size()+"  "+(System.currentTimeMillis()-startTime));

        log.info("jdbcTemplate方法3消耗时长 "+(System.currentTimeMillis()-startTime)+"
"+JSON.toJSONString(menuList,SerializerFeature.PrettyFormat));


        //方法四，使用BeanPropertyRowMapper,https://blog.csdn.net/u011332918/article/details/45560117
        //https://blog.csdn.net/limenghua9112/article/details/45096437
        //使用BeanPropertyRowMapper源码分析
//        https://www.cnblogs.com/VergiLyn/p/6040963.html
        //官方文档：https://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/jdbc/core/BeanPropertyRowMapper.html
        //BeanPropertyRowMapper默认提供驼峰加下划线的规则将field和cloumn进行映射，并没有提供注解的方式实现映射，需要在SQL中写别名
        List<UserResponEntity> beanList = jdbcTemplate.query(sql,new Object[]{userId},new BeanPropertyRowMapper<UserResponEntity>(UserResponEntity.class));

        log.info(JSON.toJSONString(beanList,SerializerFeature.PrettyFormat));
        log.info(" list  长度"+beanList.size()+"  "+(System.currentTimeMillis()-startTime));


//此处使用NativeQuery进行查询
//        startTime = System.currentTimeMillis();
//        Query query = em.createNativeQuery(sql);
//与Hiberante不同,jpa query从位置1开始
//        query.setParameter(1, userId);
//        List<Object[]> queryList = query.getResultList();
//        log.info("createNativeQuery消耗时长" + (System.currentTimeMillis() - startTime) + "queryList.size " + queryList.size());

    }

}

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原文地址：https://www.cnblogs.com/huanghongbo/p/9009326.html