--表結(jié)構(gòu)

CREATE TABLE `address` (

`id` int(11) NOT NULL AUTO_INCREMENT,

`code_value` varchar(32) DEFAULT NULL COMMENT '區(qū)域編碼',

`name` varchar(128) DEFAULT NULL COMMENT '區(qū)域名稱',

`remark` varchar(128) DEFAULT NULL COMMENT '說明',

`pid` varchar(32) DEFAULT NULL COMMENT 'pid是code_value',

PRIMARY KEY (`id`),

KEY `ix_name` (`name`,`code_value`,`pid`)

) ENGINE=InnoDB AUTO_INCREMENT=1033 DEFAULT CHARSET=utf8 COMMENT='行政區(qū)域表';

--mysql 實(shí)現(xiàn)樹結(jié)構(gòu)查詢

--方法一

CREATE PROCEDURE sp_showChildLst(IN rootId varchar(20))

BEGIN

CREATE TEMPORARY TABLE IF NOT EXISTS tmpLst

(sno int primary key auto_increment,code_value VARCHAR(20),depth int);

DELETE FROM tmpLst;

CALL sp_createChildLst(rootId,0);

select tmpLst.*,address.* from tmpLst,address where tmpLst.code_value=address.code_value order by tmpLst.sno;

END

CREATE PROCEDURE sp_createChildLst(IN rootId varchar(20),IN nDepth INT)

BEGIN

DECLARE done INT DEFAULT 0;

DECLARE b VARCHAR(20);

DECLARE cur1 CURSOR FOR SELECT code_value FROM address where pid=rootId;

DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1;

insert into tmpLst values (null,rootId,nDepth);

SET @@max_sp_recursion_depth = 10;

OPEN cur1;

FETCH cur1 INTO b;

WHILE done=0 DO

CALL sp_createChildLst(b,nDepth+1);

FETCH cur1 INTO b;

END WHILE;

CLOSE cur1;

END

--方法二(此方法有線程安全問題)

CREATE PROCEDURE sp_getAddressChild_list(in idd varchar(36))

begin

declare lev int;

set lev=1;

drop table if exists tmp1;

CREATE TABLE tmp1(code_value VARCHAR(36),`name` varchar(50),pid varchar(36) ,levv INT);

INSERT tmp1 SELECT code_value,`name`,pid,1 FROM address WHERE pid=idd;

while row_count()>0

do

set lev=lev+1;

INSERT tmp1 SELECT t.code_value,t.`name`,t.pid,lev from address t join tmp1 a on t.pid=a.code_value AND levv=lev-1;

end while ;

INSERT tmp1 SELECT code_value,`name`,pid,0 FROM address WHERE code_value=idd;

SELECT * FROM tmp1;

end

--方法三

CREATE FUNCTION fn_getAddress_ChildList_test(rootId INT) RETURNS varchar(1000) CHARSET utf8 #rootId為你要查詢的節(jié)點(diǎn)

BEGIN

#聲明兩個(gè)臨時(shí)變量

DECLARE temp VARCHAR(1000);

DECLARE tempChd VARCHAR(1000);

SET temp = '$';

SET tempChd=CAST(rootId AS CHAR);#把rootId強(qiáng)制轉(zhuǎn)換為字符

WHILE tempChd is not null DO

SET temp = CONCAT(temp,',',tempChd);#循環(huán)把所有節(jié)點(diǎn)連接成字符串。

SELECT GROUP_CONCAT(code_value) INTO tempChd FROM address where FIND_IN_SET(pid,tempChd)>0;

END WHILE;

RETURN temp;

END

--方法四

CREATE PROCEDURE sp_findAddressChild(iid varchar(50),layer bigint(20))

BEGIN

/*創(chuàng)建接受查詢的臨時(shí)表 */

create temporary table if not exists tmp_table(id varchar(50),code_value varchar(50),name varchar(50),pid VARCHAR(50)) ENGINE=InnoDB DEFAULT CHARSET=utf8;

/*最高允許遞歸數(shù)*/

SET @@max_sp_recursion_depth = 10 ;

call sp_iterativeAddress(iid,layer);/*核心數(shù)據(jù)收集*/

select * from tmp_table ;/* 展現(xiàn) */

drop temporary table if exists tmp_table ;/*刪除臨時(shí)表*/

END

CREATE PROCEDURE sp_iterativeAddress(iid varchar(50),layer bigint(20))

BEGIN

DECLARE t_id INT;

declare t_codeValue varchar(50) default iid ;

declare t_name varchar(50) character set utf8;

declare t_pid varchar(50) character set utf8;

/* 游標(biāo)定義 */

declare cur1 CURSOR FOR select id,code_value,`name`,pid from address where pid=iid ;

declare CONTINUE HANDLER FOR SQLSTATE '02000' SET t_codeValue = null;

/* 允許遞歸深度 */

if layer>0 then

OPEN cur1 ;

FETCH cur1 INTO t_id,t_codeValue,t_name,t_pid ;

WHILE ( t_codeValue is not null )

DO

/* 核心數(shù)據(jù)收集 */

insert into tmp_table values(t_id,t_codeValue,t_name,t_pid);

call sp_iterativeAddress(t_codeValue,layer-1);

FETCH cur1 INTO t_id,t_codeValue,t_name,t_pid ;

END WHILE;

end if;

END

--方法五 SQL實(shí)現(xiàn)

SELECT `name`,code_value AS code_value,pid AS 父ID ,levels AS 父到子之間級(jí)數(shù), paths AS 父到子路徑 FROM (

SELECT `name`,code_value,pid,

@le:= IF (pid = 0 ,0,

IF( LOCATE( CONCAT('|',pid,':'),@pathlevel) > 0 ,

SUBSTRING_INDEX( SUBSTRING_INDEX(@pathlevel,CONCAT('|',pid,':'),-1),'|',1) +1

,@le+1) ) levels

, @pathlevel:= CONCAT(@pathlevel,'|',code_value,':', @le ,'|') pathlevel

, @pathnodes:= IF( pid =0,',0',

CONCAT_WS(',',

IF( LOCATE( CONCAT('|',pid,':'),@pathall) > 0 ,

SUBSTRING_INDEX( SUBSTRING_INDEX(@pathall,CONCAT('|',pid,':'),-1),'|',1)

,@pathnodes ) ,pid ) )paths

,@pathall:=CONCAT(@pathall,'|',code_value,':', @pathnodes ,'|') pathall

FROM address,

(SELECT @le:=0,@pathlevel:='', @pathall:='',@pathnodes:='') vv

ORDER BY pid,code_value

) src

ORDER BY pid

--方法6 ?存儲(chǔ)過程(SQL實(shí)現(xiàn))

create procedure query_all_add_children(in inPid varchar(50))

begin

select id,code_value,name,remark,pid,p2id,p3id,p4id,p5id

from(

select a1.id,a1.code_value,a1.name,a1.remark,

a1.pid,a2.pid p2id,a3.pid p3id,a4.pid p4id,a5.pid p5id

from

address a1 left join address a2

on(a1.pid=a2.code_value)

left join address a3

on(a2.pid=a3.code_value)

left join address a4

on(a3.pid=a4.code_value)

left join address a5

on(a4.pid=a5.code_value)

) al

where

(pid=inPid

or p2id=inPid

or p3id=inPid

or p4id=inPid

or p5id=inPid

);

end

個(gè)人的一些理解：我是用的方法一：取出所有節(jié)點(diǎn)利用MySql函數(shù)截取所需要的字符串，然后在SQL中字段IN(調(diào)用此方法)來進(jìn)行查詢，這樣效率比較高，方法6效率也較高，其他方法都有效率問題。

超強(qiáng)干貨來襲 云風(fēng)專訪：近40年碼齡，通宵達(dá)旦的技術(shù)人生

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