迭代后从 Temp Table 中提取值
Pulling Values From Temp Table After An Iteration
我正在查询某些数据库中最近数据的总大小。
我创建了一个 table 包含要查询的 DB，然后对其进行迭代以获取 DB 名称和 运行 迭代的总次数。
然后我创建一个临时文件table，其中将插入所需的数据。
I 运行 迭代以获取信息并将其推送到每个数据库的 temptable 中。
迭代完成后，我无法从这个新创建的 table 中提取值。
我在代码的每一部分旁边写了一些注释，解释我正在尝试做什么以及我期望发生什么。
/*check if the #databases table is already present and then drop it*/
IF OBJECT_ID('tempdb..#databases', 'U') IS NOT NULL
begin
drop table #databases;
end
select ArtifactID into #databases from edds.eddsdbo.[Case]
where name like '%Review%'
/*Once this first statement has been run there will now be a
number column that is associated with the artificatID. Each database has an area that is
titled [EDDS'artifactID']. So if the artifactID = 1111111 then the DB would
be accessed at [EDDS1111111]*/
declare @runs int = 1; /*this will track the number of times iterated
over the result set*/
declare @max int = 0; /*this will be the limit*/
declare @databasename sysname='' /*this will allow the population of each
database name*/
/*check if your temp table exists and drop if necessary*/
IF OBJECT_ID('tempdb..#temptable', 'U') IS NOT NULL
begin
drop table #temptable;
end
/*create the temp table as outside the loop*/
create table #temptable(
fileSize dec,
extractedTextSize dec
)
while @runs<=@max
begin
select @max=count(*) from #databases;
/*the @max is now the number of databases inserted in to this table*/
/*This select statement pulls the information that will be placed
into the temptable. This second statment should be inside the loop. One time
for each DB that appeared in the first query's results.*/
/*begin the loop by assigning your database name, I don't know what the
column is called so I have just called it databasename for now*/
select top 1 @databasename = ArtifactID from #databases;
/*generate your sql using the @databasename variable, if you want to make
the database and table names dynamic too then you can use the same formula*/
insert into #temptable
select SUM(fileSize)/1024/1024/1024, SUM(extractedTextSize)/1024/1024
FROM [EDDS'+cast(@databasename as nvarchar(128))+'].[EDDSDBO].[Document] ed
where ed.CreatedDate >= (select CONVERT(varchar,dateadd(d,-
(day(getdate())),getdate()),106))'
/*remove that row from the databases table so the row won't be redone
This will take the @max and lessen it by one*/
delete from #databases where ArtifactID=@databasename;
/* Once the @max is less than 1 then end the loop*/
end
/* Query the final values in the temp table after the iteration is complete*/
select filesize+extractedTextSize as Gigs from #temptable
当最后的 select 语句 运行s 从 #temptable 中提取值时，响应是单个演出列（如预期的那样），但 table 本身是空白的。
正在清除 table 中的数据，我卡住了。
我不确定我的错误是语法错误还是一般的逻辑错误，但我们将不胜感激。
对格式进行了一些调整，但主要问题是您的循环永远不会 运行。
你有@运行s <= @max，但是@max = 1 和@运行s = 0 在开始时所以它永远不会循环
要解决此问题，您可以做几件不同的事情，但我在循环之前设置了@max，并且在循环中每个循环只向@运行s 添加了 1，因为您知道需要多少@最大循环 运行s 之前，只需将其添加到 运行s 的数量并进行比较。
但是请注意，有比您现有的方式更好的方法。将身份放在#databases table 上，然后在循环中执行 where databaseID = loopCount （然后您不必从 table 中删除）
--check if the #databases table is already present and then drop it
IF OBJECT_ID('tempdb..#databases', 'U') IS NOT NULL
drop table #databases;
--Once this first statement has been run there will now be a number column that is associated with the artificatID. Each database has an area that is
-- titled [EDDS'artifactID']. So if the artifactID = 1111111 then the DB would be accessed at [EDDS1111111]
select ArtifactID
INTO #databases
FROM edds.eddsdbo.[Case]
where name like '%Review%'
-- set to 0 to start
DECLARE @runs int = 0;
--this will be the limit
DECLARE @max int = 0;
--this will allow the population of each database name
DECLARE @databasename sysname = ''
--check if your temp table exists and drop if necessary
IF OBJECT_ID('tempdb..#temptable', 'U') IS NOT NULL
drop table #temptable;
--create the temp table as outside the loop
create table #temptable(
fileSize dec,
extractedTextSize dec
)
-- ***********************************************
-- Need to set the value your looping on before you get to your loop, also so if you dont have any you wont do your loop
-- ***********************************************
--the @max is now the number of databases inserted in to this table
select @max = COUNT(*)
FROM #databases;
while @runs <= @max
BEGIN
/*This select statement pulls the information that will be placed
into the temptable. This second statment should be inside the loop. One time
for each DB that appeared in the first query's results.*/
/*begin the loop by assigning your database name, I don't know what the
column is called so I have just called it databasename for now*/
select top 1 @databasename = ArtifactID from #databases;
/*generate your sql using the @databasename variable, if you want to make
the database and table names dynamic too then you can use the same formula*/
insert into #temptable
select SUM(fileSize)/1024/1024/1024, SUM(extractedTextSize)/1024/1024
FROM [EDDS'+cast(@databasename as nvarchar(128))+'].[EDDSDBO].[Document] ed
where ed.CreatedDate >= (select CONVERT(varchar,dateadd(d,- (day(getdate())),getdate()),106))
--remove that row from the databases table so the row won't be redone This will take the @max and lessen it by one
delete from #databases where ArtifactID=@databasename;
--Once the @max is less than 1 then end the loop
-- ***********************************************
-- no need to select from the table and change your max value, just change your runs by adding one for each run
-- ***********************************************
--the @max is now the number of databases inserted in to this table
select @runs = @runs + 1 --@max=count(*) from #databases;
end
-- Query the final values in the temp table after the iteration is complete
select filesize+extractedTextSize as Gigs from #temptable
这是第二个答案，但它可以替代我在上面提到的那样，并且更清洁 post 到 post 作为替代答案，使它们分开
这是进行循环的更好方法（尚未完全测试，因此您必须进行验证）。
但不是从您的 table 中删除，而是向它添加一个 ID 并使用该 ID 遍历它。步骤更少，更干净。
--check if the #databases table is already present and then drop it
IF OBJECT_ID('tempdb..#databases', 'U') IS NOT NULL
drop table #databases;
--create the temp table as outside the loop
create table #databases(
ID INT IDENTITY,
ArtifactID VARCHAR(20) -- not sure of this ID's data type
)
--check if your temp table exists and drop if necessary
IF OBJECT_ID('tempdb..#temptable', 'U') IS NOT NULL
drop table #temptable;
--create the temp table as outside the loop
create table #temptable(
fileSize dec,
extractedTextSize dec
)
--this will allow the population of each database name
DECLARE @databasename sysname = ''
-- initialze to 1 so it matches first record in temp table
DECLARE @LoopOn int = 1;
--this will be the max count from table
DECLARE @MaxCount int = 0;
--Once this first statement has been run there will now be a number column that is associated with the artificatID. Each database has an area that is
-- titled [EDDS'artifactID']. So if the artifactID = 1111111 then the DB would be accessed at [EDDS1111111]
-- do insert here so it adds the ID column
INSERT INTO #databases(
ArtifactID
)
SELECT ArtifactID
FROM edds.eddsdbo.[Case]
where name like '%Review%'
-- sets the max number of loops we are going to do
select @MaxCount = COUNT(*)
FROM #databases;
while @LoopOn <= @MaxCount
BEGIN
-- your table has IDENTITY so select the one for the loop your on (initalize to 1)
select @databasename = ArtifactID
FROM #databases
WHERE ID = @LoopOn;
--generate your sql using the @databasename variable, if you want to make
--the database and table names dynamic too then you can use the same formula
insert into #temptable
select SUM(fileSize)/1024/1024/1024, SUM(extractedTextSize)/1024/1024
-- dont know/think this will work like this? If not you have to use dynamic SQL
FROM [EDDS'+cast(@databasename as nvarchar(128))+'].[EDDSDBO].[Document] ed
where ed.CreatedDate >= (select CONVERT(varchar,dateadd(d,- (day(getdate())),getdate()),106))
-- remove all deletes/etc and just add one to the @LoopOn and it will be selected above based off the ID
select @LoopOn += 1
end
-- Query the final values in the temp table after the iteration is complete
select filesize+extractedTextSize as Gigs
FROM #temptable
我正在查询某些数据库中最近数据的总大小。
我创建了一个 table 包含要查询的 DB，然后对其进行迭代以获取 DB 名称和 运行 迭代的总次数。
然后我创建一个临时文件table，其中将插入所需的数据。
I 运行 迭代以获取信息并将其推送到每个数据库的 temptable 中。
迭代完成后，我无法从这个新创建的 table 中提取值。
我在代码的每一部分旁边写了一些注释，解释我正在尝试做什么以及我期望发生什么。
/*check if the #databases table is already present and then drop it*/
IF OBJECT_ID('tempdb..#databases', 'U') IS NOT NULL
begin
drop table #databases;
end
select ArtifactID into #databases from edds.eddsdbo.[Case]
where name like '%Review%'
/*Once this first statement has been run there will now be a
number column that is associated with the artificatID. Each database has an area that is
titled [EDDS'artifactID']. So if the artifactID = 1111111 then the DB would
be accessed at [EDDS1111111]*/
declare @runs int = 1; /*this will track the number of times iterated
over the result set*/
declare @max int = 0; /*this will be the limit*/
declare @databasename sysname='' /*this will allow the population of each
database name*/
/*check if your temp table exists and drop if necessary*/
IF OBJECT_ID('tempdb..#temptable', 'U') IS NOT NULL
begin
drop table #temptable;
end
/*create the temp table as outside the loop*/
create table #temptable(
fileSize dec,
extractedTextSize dec
)
while @runs<=@max
begin
select @max=count(*) from #databases;
/*the @max is now the number of databases inserted in to this table*/
/*This select statement pulls the information that will be placed
into the temptable. This second statment should be inside the loop. One time
for each DB that appeared in the first query's results.*/
/*begin the loop by assigning your database name, I don't know what the
column is called so I have just called it databasename for now*/
select top 1 @databasename = ArtifactID from #databases;
/*generate your sql using the @databasename variable, if you want to make
the database and table names dynamic too then you can use the same formula*/
insert into #temptable
select SUM(fileSize)/1024/1024/1024, SUM(extractedTextSize)/1024/1024
FROM [EDDS'+cast(@databasename as nvarchar(128))+'].[EDDSDBO].[Document] ed
where ed.CreatedDate >= (select CONVERT(varchar,dateadd(d,-
(day(getdate())),getdate()),106))'
/*remove that row from the databases table so the row won't be redone
This will take the @max and lessen it by one*/
delete from #databases where ArtifactID=@databasename;
/* Once the @max is less than 1 then end the loop*/
end
/* Query the final values in the temp table after the iteration is complete*/
select filesize+extractedTextSize as Gigs from #temptable
当最后的 select 语句 运行s 从 #temptable 中提取值时，响应是单个演出列（如预期的那样），但 table 本身是空白的。
正在清除 table 中的数据，我卡住了。
我不确定我的错误是语法错误还是一般的逻辑错误，但我们将不胜感激。
对格式进行了一些调整，但主要问题是您的循环永远不会 运行。
你有@运行s <= @max，但是@max = 1 和@运行s = 0 在开始时所以它永远不会循环
要解决此问题，您可以做几件不同的事情，但我在循环之前设置了@max，并且在循环中每个循环只向@运行s 添加了 1，因为您知道需要多少@最大循环 运行s 之前，只需将其添加到 运行s 的数量并进行比较。
但是请注意，有比您现有的方式更好的方法。将身份放在#databases table 上，然后在循环中执行 where databaseID = loopCount （然后您不必从 table 中删除）
--check if the #databases table is already present and then drop it
IF OBJECT_ID('tempdb..#databases', 'U') IS NOT NULL
drop table #databases;
--Once this first statement has been run there will now be a number column that is associated with the artificatID. Each database has an area that is
-- titled [EDDS'artifactID']. So if the artifactID = 1111111 then the DB would be accessed at [EDDS1111111]
select ArtifactID
INTO #databases
FROM edds.eddsdbo.[Case]
where name like '%Review%'
-- set to 0 to start
DECLARE @runs int = 0;
--this will be the limit
DECLARE @max int = 0;
--this will allow the population of each database name
DECLARE @databasename sysname = ''
--check if your temp table exists and drop if necessary
IF OBJECT_ID('tempdb..#temptable', 'U') IS NOT NULL
drop table #temptable;
--create the temp table as outside the loop
create table #temptable(
fileSize dec,
extractedTextSize dec
)
-- ***********************************************
-- Need to set the value your looping on before you get to your loop, also so if you dont have any you wont do your loop
-- ***********************************************
--the @max is now the number of databases inserted in to this table
select @max = COUNT(*)
FROM #databases;
while @runs <= @max
BEGIN
/*This select statement pulls the information that will be placed
into the temptable. This second statment should be inside the loop. One time
for each DB that appeared in the first query's results.*/
/*begin the loop by assigning your database name, I don't know what the
column is called so I have just called it databasename for now*/
select top 1 @databasename = ArtifactID from #databases;
/*generate your sql using the @databasename variable, if you want to make
the database and table names dynamic too then you can use the same formula*/
insert into #temptable
select SUM(fileSize)/1024/1024/1024, SUM(extractedTextSize)/1024/1024
FROM [EDDS'+cast(@databasename as nvarchar(128))+'].[EDDSDBO].[Document] ed
where ed.CreatedDate >= (select CONVERT(varchar,dateadd(d,- (day(getdate())),getdate()),106))
--remove that row from the databases table so the row won't be redone This will take the @max and lessen it by one
delete from #databases where ArtifactID=@databasename;
--Once the @max is less than 1 then end the loop
-- ***********************************************
-- no need to select from the table and change your max value, just change your runs by adding one for each run
-- ***********************************************
--the @max is now the number of databases inserted in to this table
select @runs = @runs + 1 --@max=count(*) from #databases;
end
-- Query the final values in the temp table after the iteration is complete
select filesize+extractedTextSize as Gigs from #temptable
这是第二个答案，但它可以替代我在上面提到的那样，并且更清洁 post 到 post 作为替代答案，使它们分开
这是进行循环的更好方法（尚未完全测试，因此您必须进行验证）。
但不是从您的 table 中删除，而是向它添加一个 ID 并使用该 ID 遍历它。步骤更少，更干净。
--check if the #databases table is already present and then drop it
IF OBJECT_ID('tempdb..#databases', 'U') IS NOT NULL
drop table #databases;
--create the temp table as outside the loop
create table #databases(
ID INT IDENTITY,
ArtifactID VARCHAR(20) -- not sure of this ID's data type
)
--check if your temp table exists and drop if necessary
IF OBJECT_ID('tempdb..#temptable', 'U') IS NOT NULL
drop table #temptable;
--create the temp table as outside the loop
create table #temptable(
fileSize dec,
extractedTextSize dec
)
--this will allow the population of each database name
DECLARE @databasename sysname = ''
-- initialze to 1 so it matches first record in temp table
DECLARE @LoopOn int = 1;
--this will be the max count from table
DECLARE @MaxCount int = 0;
--Once this first statement has been run there will now be a number column that is associated with the artificatID. Each database has an area that is
-- titled [EDDS'artifactID']. So if the artifactID = 1111111 then the DB would be accessed at [EDDS1111111]
-- do insert here so it adds the ID column
INSERT INTO #databases(
ArtifactID
)
SELECT ArtifactID
FROM edds.eddsdbo.[Case]
where name like '%Review%'
-- sets the max number of loops we are going to do
select @MaxCount = COUNT(*)
FROM #databases;
while @LoopOn <= @MaxCount
BEGIN
-- your table has IDENTITY so select the one for the loop your on (initalize to 1)
select @databasename = ArtifactID
FROM #databases
WHERE ID = @LoopOn;
--generate your sql using the @databasename variable, if you want to make
--the database and table names dynamic too then you can use the same formula
insert into #temptable
select SUM(fileSize)/1024/1024/1024, SUM(extractedTextSize)/1024/1024
-- dont know/think this will work like this? If not you have to use dynamic SQL
FROM [EDDS'+cast(@databasename as nvarchar(128))+'].[EDDSDBO].[Document] ed
where ed.CreatedDate >= (select CONVERT(varchar,dateadd(d,- (day(getdate())),getdate()),106))
-- remove all deletes/etc and just add one to the @LoopOn and it will be selected above based off the ID
select @LoopOn += 1
end
-- Query the final values in the temp table after the iteration is complete
select filesize+extractedTextSize as Gigs
FROM #temptable