sql多条件组合查询，并根据指定类别找出所有最小子类别的SQL语-mysql教程

多条件组合查询，并根据指定类别找出所有最小子类别的SQL语句备忘

代码如下:
DECLARE @PAGESIZE INT
DECLARE @PAGEINDEX INT

DECLARE @PAGECOUNT INT
DECLARE @RECORDCOUNT INT

SELECT @PAGESIZE=5
SELECT @PAGEINDEX=1

DECLARE @FIELDNAME VARCHAR(50)
DECLARE @FIELDVALUE VARCHAR(50)
DECLARE @OPERATION VARCHAR(50)

--组合条件
DECLARE @WHERE NVARCHAR(1000)
SELECT @WHERE=' WHERE NOTDISPLAY=0 '

DECLARE ABC CURSOR FOR
SELECT FIELDNAME,FIELDVALUE,OPERATION FROM TBPARAMETERS
OPEN ABC
FETCH NEXT FROM ABC INTO @FIELDNAME,@FIELDVALUE,@OPERATION
WHILE @@FETCH_STATUS=0
BEGIN
IF(@OPERATION = 'Like')
SELECT @WHERE=@WHERE + ' AND ' + @FIELDNAME + ' Like ''%'+@FIELDVALUE+'%'''
ELSE
BEGIN
IF(@FIELDNAME='CLASSID')
BEGIN
DECLARE @ROOTID INT
SELECT @ROOTID=@FIELDVALUE
--将指定类别的值的子类加入临时表
INSERT INTO TBTEMCLASS(ID) SELECT ID FROM TBSDINFOCLASS WHERE ROOTID=@ROOTID

--使用游标来将指定类别的最小类别提出放入临时表
DECLARE CLASSID CURSOR FOR
SELECT ID FROM TBTEMCLASS
OPEN CLASSID
FETCH NEXT FROM CLASSID INTO @ROOTID
WHILE @@FETCH_STATUS=0
BEGIN
--如果判断有子类则将子类加入临时表，并删除该类别，以使游标在临时表中循环
IF(EXISTS(SELECT ID FROM TBSDINFOCLASS WHERE ROOTID=@ROOTID))
BEGIN
INSERT INTO TBTEMCLASS(ID) SELECT ID FROM TBSDINFOCLASS WHERE ROOTID=@ROOTID
DELETE FROM TBTEMCLASS WHERE ID=@ROOTID
END
FETCH NEXT FROM CLASSID INTO @ROOTID
END
CLOSE CLASSID
DEALLOCATE CLASSID

--将自身加入临时表
INSERT INTO TBTEMCLASS(ID) SELECT @FIELDVALUE

SELECT @WHERE=@WHERE +' AND CLASSID IN(SELECT ID FROM TBTEMCLASS)'
END
ELSE
SELECT @WHERE=@WHERE + ' AND ' + @FIELDNAME + @OPERATION+@FIELDVALUE
END
FETCH NEXT FROM ABC INTO @FIELDNAME,@FIELDVALUE,@OPERATION
END
CLOSE ABC
DEALLOCATE ABC

TRUNCATE TABLE TBPARAMETERS

-- --计数语句
DECLARE @COUNTSQL NVARCHAR(500)
SELECT @COUNTSQL=N'SELECT @RECORDCOUNT=COUNT(*) FROM TBSDINFO INNER JOIN TBUSER ON TBSDINFO.USERNAME=TBUSER.USERNAME '
SELECT @COUNTSQL=@COUNTSQL+@WHERE
--
-- --执行统计
EXEC sp_executesql @COUNTSQL,
N'@RECORDCOUNT INT OUT',
@RECORDCOUNT OUT
--
-- --计算页数
SET @PageCount = CEILING(@RecordCount * 1.0 / @PageSize)
--
-- --查询语句
DECLARE @SQL NVARCHAR(2000)
DECLARE @ORDERBY VARCHAR(100)
SELECT @ORDERBY=' ORDER BY TBSDINFO.IsCommon DESC,TBSDINFO.CommonTime DESC,TBSDINFO.CreateTime DESC'

IF(@PAGEINDEX=1)
BEGIN
SELECT @SQL='INSERT INTO TBTEMINFO(ID,TITLE,REMARK,CREATETIME,ENDTIME,WEBDOMAIN,CLASSID,CLASSNAME,TYPEID,TYPENAME,PROVINCEID,PROVINCE,CITYID,CITY,COMPANYNAME,ADDRESS,USERTYPE) '
SELECT @SQL=@SQL+'SELECT TOP '+CONVERT(VARCHAR(4),@PAGESIZE)+' TBSDINFO.ID,TITLE,Remark,TBSDINFO.Createtime,EndTime, WebDomain,TBSDINFO.CLASSID,(SELECT CLASSNAME FROM TBSDINFOCLASS WHERE TBSDINFOCLASS.ID=TBSDINFO.CLASSID) AS CLASSNAME,TYPEID,(SELECT TYPENAME FROM TBSDINFOTYPE WHERE TBSDINFO.TYPEID=TBSDINFOTYPE.ID) AS TYPENAME,ProvinceID,(SELECT PROVINCE FROM TBPROVINCE WHERE TBPROVINCE.ID=PROVINCEID) AS PROVINCE,CityID,(SELECT CITY FROM TBCITY WHERE TBCITY.ID=CITYID) AS CITY,CompanyName,TBSDINFO.Address,UserType FROM TBSDINFO INNER JOIN TBUSER ON TBUSER.USERNAME=TBSDINFO.USERNAME'
SELECT @SQL=@SQL+@WHERE
SELECT @SQL=@SQL+@ORDERBY
END
ELSE
BEGIN
DECLARE @MINRECORD INT
SELECT @MINRECORD=(@PAGEINDEX-1)*@PAGESIZE
SELECT @SQL='INSERT INTO TBTEMINFO(ID,TITLE,REMARK,CREATETIME,ENDTIME,WEBDOMAIN,CLASSID,CLASSNAME,TYPEID,TYPENAME,PROVINCEID,PROVINCE,CITYID,CITY,COMPANYNAME,ADDRESS,USERTYPE) '
SELECT @SQL=@SQL+'SELECT TOP '+CONVERT(VARCHAR(4),@PAGESIZE)+' TBSDINFO.ID, TITLE,Remark,TBSDINFO.Createtime,EndTime, WebDomain,TBSDINFO.CLASSID,(SELECT CLASSNAME FROM TBSDINFOCLASS WHERE TBSDINFOCLASS.ID=TBSDINFO.CLASSID) AS CLASSNAME,TYPEID,(SELECT TYPENAME FROM TBSDINFOTYPE WHERE TBSDINFO.TYPEID=TBSDINFOTYPE.ID) AS TYPENAME,ProvinceID,(SELECT PROVINCE FROM TBPROVINCE WHERE TBPROVINCE.ID=PROVINCEID) AS PROVINCE,CityID,(SELECT CITY FROM TBCITY WHERE TBCITY.ID=CITYID) AS CITY,CompanyName,TBSDINFO.Address,UserType FROM TBSDINFO INNER JOIN TBUSER ON TBUSER.USERNAME=TBSDINFO.USERNAME'
IF(@WHERE<>'')
SELECT @SQL=@SQL+@WHERE+' AND '
ELSE
SELECT @SQL=@SQL+' WHERE '
SELECT @SQL=@SQL+' TBSDINFO.ID NOT IN(SELECT TOP '+CONVERT(VARCHAR(4),@MINRECORD)+' TBSDINFO.ID FROM TBSDINFO INNER JOIN TBUSER ON TBUSER.USERNAME=TBSDINFO.USERNAME '+@WHERE+@ORDERBY+')'

SELECT @SQL=@SQL+@ORDERBY
END

--PRINT @SQL

--执行查询
--查询的结果是将找到的记录放入临时表，再通过以下游标查询出相应的父类与根类记录
EXEC (@SQL)

DECLARE @CLASSID INT
DECLARE @ID INT

DECLARE TEM CURSOR FOR
SELECT ID,CLASSID FROM TBTEMINFO
OPEN TEM
FETCH NEXT FROM TEM INTO @ID,@CLASSID
WHILE @@FETCH_STATUS=0
BEGIN
DECLARE @NS VARCHAR(500)
DECLARE @DS VARCHAR(200)

SELECT @NS=''
SELECT @DS=''

DECLARE @TEMROOTID INT

DECLARE @TEMTS VARCHAR(50)
SELECT @CLASSID=ID,@TEMTS=CLASSNAME,@TEMROOTID=ROOTID FROM TBSDINFOCLASS WHERE ID=@CLASSID
SELECT @NS=@TEMTS+'#'+@NS
SELECT @DS=CONVERT(VARCHAR(10),@CLASSID)+'#'+@DS

WHILE(@TEMROOTID>0)
BEGIN
SELECT @TEMROOTID=ROOTID,@CLASSID=ID,@TEMTS=CLASSNAME FROM TBSDINFOCLASS WHERE ID=@TEMROOTID
SELECT @NS=@TEMTS+'#'+@NS
SELECT @DS=CONVERT(VARCHAR(10),@CLASSID)+'#'+@DS
END

UPDATE TBTEMINFO SET NS=@NS,DS=@DS WHERE ID=@ID

FETCH NEXT FROM TEM INTO @ID,@CLASSID
END
CLOSE TEM
DEALLOCATE TEM


SELECT * FROM TBTEMINFO

TRUNCATE TABLE TBTEMINFO
TRUNCATE TABLE TBTEMCLASS