Is it possible to perform a cascading delete and update using TRIGGERS on a table referenced by a foreign key constraint.?To be more specific.. if the primary key is deleted does the delete trigger on the primary table deletes the record in the foreign key table or does it return an error??
if possible please send us the T SQL Statements .
Thanks in Advance
Geenu
Ajaz Dawre
I need to implement my cascading deletes on a SQL database. Is it better (performance/reliablility-wise) to use the Foreign Key Cascading Deletes or to just write my own triggers to do the deletes?I was hoping someone had experimented and found which works best.
View 2 Replies View RelatedMicrosoft article Q142480 states "Triggers cannot be used to perform cascading updates and deletes if ForeignKey-to-PrimaryKey relationships have been extablished using SQL Server's DRI."
Does this mean that I cannot declare FK's in my scripts if I want to have triggers in the table? Do I just add a column in my table that will have a foreign key in it, but just not reference it in my script? Can someone clarify for me?
Thanks,
Nathan
I am having great difficulty with cascading deletes, delete triggers and referential integrity.
The database is in First Normal Form.
I have some tables that are child tables with two foreign keyes to two different parent tables, for example:
Table A
/
Table B Table C
/
Table D
So if I try to turn on cascading deletes for A/B, A/C, B/D and C/D relationships, I get an error that I cannot have cascading delete because it would create multiple cascade paths. I do understand why this is happening. If I delete a row in Table A, I want it to delete child rows in Table B and table C, and then child rows in table D as well. But if I delete a row in Table C, I want it to delete child rows in Table D, and if I delete a row in Table B, I want it to also delete child rows in Table D.
SQL sees this as cyclical, because if I delete a row in table A, both table B and table C would try to delete their child rows in table D.
Ok, so I thought, no biggie, I'll just use delete triggers. So I created delete triggers that will delete child rows in table B and table C when deleting a row in table A. Then I created triggers in both Table B and Table C that would delete child rows in Table D.
When I try to delete a row in table A, B or C, I get the error "Delete Statement Conflicted with COLUMN REFERENCE". This does not make sense to me, can anyone explain? I have a trigger in place that should be deleting the child rows before it attempts to delete the parent row...isn't that the whole point of delete triggers?????
This is an example of my delete trigger:
CREATE TRIGGER [DeleteA] ON A
FOR DELETE
AS
Delete from B where MeetingID = ID;
Delete from C where MeetingID = ID;
And then Table B and C both have delete triggers to delete child rows in table D. But it never gets to that point, none of the triggers execute because the above error happens first.
So if I then go into the relationships, and deselect the option for "Enforce relationship for INSERTs and UPDATEs" these triggers all work just fine. Only problem is that now I have no referential integrity and I can simply create unrestrained child rows that do not reference actual foreign keys in the parent table.
So the question is, how do I maintain referential integrity and also have the database delete child rows, keeping in mind that the cascading deletes will not work because of the multiple cascade paths (which are certainly required).
Hope this makes sense...
Thanks,
Josh
I use SQL Server 2005I have tables tblUserData, tblUsersAndGuestbook, tblGuestbooktblUserdata contains:UserCode intUsername nvarchar(50)tblUsersAndGuestbook contains:Usercode int (FK to tblUserData)GBEntryCode inttblGuestbookGBEntryCode int (FK to tblUsersAndGuestbook)GBText textNow...if I delete a user in tblUserData I want to also delete the entries in tblUsersAndGuestbook AND in tblGuestbook.I've heard something about cascading delete, but how can i configure that in my database?Or do I manually need to delete all entries from code?
View 2 Replies View RelatedHi,
I read all the existing material in SWYNK but still am not clear on the following question.
What is the best way to perform Cascading actions (Delete & Update) with foreign Key Constraints declared? We are using SQL Server 7.0
thanks
Rozina
Procedure spDeleteRows
/*
Recursive row delete procedure.
It deletes all rows in the table specified that conform to the criteria selected,
while also deleting any child/grandchild records and so on. This is designed to do the
same sort of thing as Access's cascade delete function. It first reads the sysforeignkeys
table to find any child tables, then deletes the soon-to-be orphan records from them using
recursive calls to this procedure. Once all child records are gone, the rows are deleted
from the selected table. It is designed at this time to be run at the command line. It could
also be used in code, but the printed output will not be available.
*/
(
@cTableName varchar(50), /* name of the table where rows are to be deleted */
@cCriteria nvarchar(1000), /* criteria used to delete the rows required */
@iRowsAffected int OUTPUT /* number of records affected by the delete */
)
As
set nocount on
declare @cTab varchar(255), /* name of the child table */
@cCol varchar(255), /* name of the linking field on the child table */
@cRefTab varchar(255), /* name of the parent table */
@cRefCol varchar(255), /* name of the linking field in the parent table */
@cFKName varchar(255), /* name of the foreign key */
@cSQL nvarchar(1000), /* query string passed to the sp_ExecuteSQL procedure */
@cChildCriteria nvarchar(1000), /* criteria to be used to delete
records from the child table */
@iChildRows int /* number of rows deleted from the child table */
/* declare the cursor containing the foreign key constraint information */
DECLARE cFKey CURSOR LOCAL FOR
SELECT SO1.name AS Tab,
SC1.name AS Col,
SO2.name AS RefTab,
SC2.name AS RefCol,
FO.name AS FKName
FROM dbo.sysforeignkeys FK
INNER JOIN dbo.syscolumns SC1 ON FK.fkeyid = SC1.id
AND FK.fkey = SC1.colid
INNER JOIN dbo.syscolumns SC2 ON FK.rkeyid = SC2.id
AND FK.rkey = SC2.colid
INNER JOIN dbo.sysobjects SO1 ON FK.fkeyid = SO1.id
INNER JOIN dbo.sysobjects SO2 ON FK.rkeyid = SO2.id
INNER JOIN dbo.sysobjects FO ON FK.constid = FO.id
WHERE SO2.Name = @cTableName
OPEN cFKey
FETCH NEXT FROM cFKey INTO @cTab, @cCol, @cRefTab, @cRefCol, @cFKName
WHILE @@FETCH_STATUS = 0
BEGIN
/* build the criteria to delete rows from the child table. As it uses the
criteria passed to this procedure, it gets progressively larger with
recursive calls */
SET @cChildCriteria = @cCol + ' in (SELECT [' + @cRefCol + '] FROM [' +
@cRefTab +'] WHERE ' + @cCriteria + ')'
print 'Deleting records from table ' + @cTab
/* call this procedure to delete the child rows */
EXEC spDeleteRows @cTab, @cChildCriteria, @iChildRows OUTPUT
FETCH NEXT FROM cFKey INTO @cTab, @cCol, @cRefTab, @cRefCol, @cFKName
END
Close cFKey
DeAllocate cFKey
/* finally delete the rows from this table and display the rows affected */
SET @cSQL = 'DELETE FROM [' + @cTableName + '] WHERE ' + @cCriteria
print @cSQL
EXEC sp_ExecuteSQL @cSQL
print 'Deleted ' + CONVERT(varchar, @@ROWCOUNT) + ' records from table ' + @cTableName
--------
The above code is good .. but has limitation...throws an error:
Server: Msg 217, Level 16, State 1, Procedure spDeleteRows, Line 58
Maximum stored procedure, function, trigger, or view nesting level exceeded (limit 32).
Can anyone out there suggest a better way of implementing on a database without a limitation of levels.. we are talking about a HUGE DB with lots of table and FK referentials..
Please advice.. or solve the problem..
Thank you
I use cascading delete on my SQL Server Database. I am experiencing along query time on my highest level delete, 10 minutes. If I deletefrom each table manually and then delete the parent, I will usually bedone in less than a minute. Any suggestions?
View 1 Replies View RelatedIf we want to maintain the data in relationships.
There are two ways to do it.
1. Auto (Like Cascading Update And Delete)
2. Manually (Like In Stored Procedures)
I read an intresting article
http://imar.spaanjaars.com/QuickDocId.aspx?quickdoc=419
In this article Imar has choosen the second way (Manually).
And when I talk to Imar.
He said, "Cascading deletes would have worked equally well in this situation. However, I personally don't like them too much. I am much rather in control, enabling me to delete what I want and when I want it. I could, for example, keep certain data for "time travelling scenarios" (e.g. the state things were in some time ago) or I might want to keep it for other purposes."
Can any one help me to choose the better one.
Waiting for helpful replies.
Edit: Sorry This is OSQL.What I use as my query is:"DELETE FROM timerecord WHERE Actual_Time_In LIKE '11.12.2006%'"The row of Actual_Time_In is formatted with Date and time (MM.DD.YYYY HH:MM:SS) sometimes there are ten records and I'd rather not have to remove them from the table one at a time. However, even though I have a record that is '11.12.2006 22:43:00' my delete doesn't work osql states I have 0 rows affected.This is only MSDE so I don't have anyother way to open the table.Sometimes these records have other records that reference them. Is there anyway to do a cascading delete without it getting to complex?Thanks of all your help, I am just a tech support guy beating his head against a wall..
View 2 Replies View Relatedhello guysi am using a table that its secondary key connected to its primary key...and as sql server 2000 doesnt allow cascade delete fore such,i had to write a trigger myselfso i wrote the following triggerCREAT TRIGGER nameON tableFOR DeleteASBEGINIF @@ROWCOUNT >0Delete from table where table.parentID in (select sortID from deleted);ENDthen i went to the table and i tried to delete...and it gave me an error....that there are records that have there parentID= sortID of the table i am trieng to delete...so i deleted the relationship...and kept the triggerand now ...when i delete one...it deletes one level down....but not more....i mean when i delete sortID=4it deletes all the records that has parentID=4...and NOT more..whereas my aim was to have it recursive not to have records lost in my databasehope i explained good as much as i hope to find an answer soon...a clear one...and thanks in advanced...
View 3 Replies View RelatedThis function will generate all DELETE statements in correct order to perform a CASCADING delete.
For self-joined tables, it will generate the T-SQL code to "unwind" the table, also in correct order!CREATE FUNCTION dbo.fnCascadingDelete
(
@Schema NVARCHAR(128) = NULL,
@Table NVARCHAR(128) = NULL
)
RETURNS@Return TABLE
(
RowID INT PRIMARY KEY CLUSTERED,
IsSelfJoin TINYINT NOT NULL,
HasPk TINYINT NOT NULL,
[SQL] NVARCHAR(4000) NOT NULL
)
AS
BEGIN
DECLARE@Constraints TABLE
(
RowID INT NOT NULL,
Indent SMALLINT NOT NULL,
[Catalog] NVARCHAR(128) NOT NULL,
[Schema] NVARCHAR(128) NOT NULL,
[Table] NVARCHAR(128) NOT NULL,
[Column] NVARCHAR(128),
pkCatalog NVARCHAR(128),
pkSchema NVARCHAR(128),
pkTable NVARCHAR(128),
pkColumn NVARCHAR(128),
pkType NVARCHAR(128),
pkSize INT,
IsSelfJoin TINYINT NOT NULL,
HasPk TINYINT NOT NULL
)
INSERT@Constraints
(
RowID,
Indent,
[Catalog],
[Schema],
[Table],
[Column],
pkCatalog,
pkSchema,
pkTable,
pkColumn,
pkType,
pkSize,
IsSelfJoin,
HasPk
)
SELECTRowID,
Indent,
[Catalog],
[Schema],
[Table],
[Column],
pkCatalog,
pkSchema,
pkTable,
pkColumn,
pkType,
pkSize,
SelfJoin,
CASE
WHEN [Column] IS NULL THEN 0
ELSE 1
END
FROMdbo.fnTableTree(@Schema, @Table)
IF @@ROWCOUNT = 0
RETURN
DECLARE@SQL TABLE
(
ID INT IDENTITY(1, 1),
RowID INT PRIMARY KEY CLUSTERED,
IsSelfJoin TINYINT NOT NULL,
HasPk TINYINT NOT NULL,
[SQL] NVARCHAR(4000) NOT NULL
)
DECLARE@Indent SMALLINT,
@RowID INT,
@ID INT,
@TSQL NVARCHAR(4000),
@RowSQL NVARCHAR(4000),
@EndSQL NVARCHAR(4000),
@pkColumn NVARCHAR(128),
@IsSelfJoin TINYINT,
@HasPk TINYINT
DECLARE@Unwind TABLE
(
RowID INT NOT NULL,
StepID INT IDENTITY(0, 1) PRIMARY KEY NONCLUSTERED,
[SQL] NVARCHAR(4000)
)
WHILE NOT EXISTS (SELECT * FROM @SQL WHERE RowID = 1)
BEGIN
SELECT TOP 1@RowID = c.RowID,
@ID = c.RowID,
@Indent = c.Indent,
@TSQL = N'',
@EndSQL = N'',
@IsSelfJoin = c.IsSelfjoin,
@HasPk = c.HasPk
FROM@Constraints AS c
LEFT JOIN@SQL AS s ON s.RowID = c.RowID
WHEREs.RowID IS NULL
ORDER BYc.Indent DESC,
c.RowID DESC
WHILE @ID > 0
BEGIN
IF @Indent = 0
SELECT@RowSQL = N'DELETE t' + CAST(@RowID AS NVARCHAR(12)),
@RowSQL = @RowSQL + N' FROM ' + QUOTENAME(c.[Catalog]) + N'.' + QUOTENAME(c.[Schema]) + N'.' + QUOTENAME(c.[Table]) + N' AS t' + CAST(@ID AS NVARCHAR(12)),
@EndSQL = N' WHERE t' + CAST(@ID AS NVARCHAR(12)) + '.' + QUOTENAME(COALESCE(c.[Column], '%0')) + N' = ''%1''',
@IsSelfJoin = @IsSelfJoin | c.IsSelfJoin
FROM@Constraints AS c
WHEREc.RowID = @ID
ELSE
SELECT@RowSQL = N' INNER JOIN ' + QUOTENAME(c.[Catalog]) + N'.' + QUOTENAME(c.[Schema]) + N'.' + QUOTENAME(c.[Table]),
@RowSQL = @RowSQL + N' AS t' + CAST(@ID AS NVARCHAR(12)) + N' ON t' + CAST(@ID AS NVARCHAR(12)) + N'.' + QUOTENAME(c.[Column]),
@pkColumn = QUOTENAME(c.pkColumn),
@IsSelfJoin = @IsSelfJoin | c.IsSelfJoin
FROM@Constraints AS c
WHEREc.RowID = @ID
SELECT TOP 1@ID = c.RowID,
@Indent = c.Indent,
@RowSQL = @RowSQL + N' = t' + CAST(c.RowID AS NVARCHAR(12)) + N'.' + @pkColumn,
@IsSelfJoin = @IsSelfJoin | c.IsSelfJoin
FROM@Constraints AS c
WHEREc.RowID < @ID
AND c.Indent < @Indent
ORDER BYc.Indent DESC,
c.RowID DESC
IF @@ROWCOUNT = 0
SET@ID = 0
SET@TSQL = @RowSQL + @TSQL
END
INSERT@SQL
(
RowID,
IsSelfJoin,
HasPk,
[SQL]
)
VALUES(
@RowID,
@IsSelfJoin,
@HasPk,
@TSQL + @EndSQL
)
IF @IsSelfJoin = 1
BEGIN
DECLARE@Yak NVARCHAR(160),
@Catalog NVARCHAR(128),
@Column NVARCHAR(128)
SELECT@Yak = pkType + COALESCE('(' + CAST(pkSize AS NVARCHAR(12)) + ')', ''),
@Catalog = [Catalog],
@Schema = [Schema],
@Table = [Table],
@Column = [Column],
@Catalog = [Catalog],
@Table = [Table],
@pkColumn = pkColumn
FROM@Constraints
WHERERowID = @RowID
SET@RowSQL = 'DECLARE@Lvl INT
SET@Lvl = 0
DECLARE@Stage TABLE (RowID INT IDENTITY(0, 1), Lvl INT, RowKey ' + @Yak + ')
INSERT @Stage (Lvl, RowKey) '
+ REPLACE(@TSQL + @EndSQL, 'DELETE t' + CAST(@RowID AS NVARCHAR(12)) + '', 'SELECT 0, t' + CAST(@RowID AS NVARCHAR(12)) + '.' + QUOTENAME(@Column) + '')
+ ' WHILE @@ROWCOUNT > 0
BEGIN
SET@Lvl = @Lvl + 1
INSERT@Stage (Lvl, RowKey)
SELECT@Lvl,
t.' + QUOTENAME(@pkColumn) + '
FROM' + QUOTENAME(@Catalog) + '.' + QUOTENAME(@Schema) + '.' + QUOTENAME(@Table) + ' AS t
INNER JOIN@Stage AS s ON s.RowKey = t.' + QUOTENAME(@Column) + '
AND s.Lvl = @Lvl - 1
LEFT JOIN@Stage AS cr ON cr.RowKey = t.' + QUOTENAME(@pkColumn) + '
WHEREcr.RowKey IS NULL
END
SELECT ''DELETE FROM ' + QUOTENAME(@Catalog) + '.' + QUOTENAME(@Schema) + '.' + QUOTENAME(@Table) + ' WHERE ' + QUOTENAME(@pkColumn) + ' = '' + QUOTENAME(RowKey, '''''''')
FROM @Stage
WHERE RowID > 0
ORDER BY RowID DESC'
INSERT@Unwind
(
RowID,
[SQL]
)
VALUES(
@RowID,
@RowSQL
)
END
END
INSERT@Return
(
RowID,
IsSelfJoin,
HasPk,
[SQL]
)
SELECTs.ID,
s.IsSelfJoin,
s.HasPk,
CASE
WHEN u.RowID IS NULL THEN s.[SQL]
ELSE u.[SQL]
END
FROM@SQL AS s
LEFT JOIN@Unwind AS u ON u.RowID = s.RowID
ORDER BYs.ID,
u.StepID
RETURN
ENDE 12°55'05.25"
N 56°04'39.16"
I have a Reporting Services 2005 report which uses cascading parameter multi-select drop-down boxes. The report runs perfect after making initial selections. However, each subsequent parameter selection causes the page to refresh to a blank page until the View Report button is clicked. What I would like to happen (which should be the norm) is for the user to be able to make all necessary selections without the page auto-refreshing after each selection. The user would then click the View Report button to regenerate the report. We are currently using reports which contain up to 5 cascading parameters. This becomes very time-consuming when the page refreshes after each selection.
Has anyone come across a solution or code alternative to this problem??
Any help would be most appreciated.
Thank you.
Tony
I have a project that consists of a SQL db with an Access front end as the user interface. Here is the structure of the table on which this question is based:
Code Block
create table #IncomeAndExpenseData (
recordID nvarchar(5)NOT NULL,
itemID int NOT NULL,
itemvalue decimal(18, 2) NULL,
monthitemvalue decimal(18, 2) NULL
)
The itemvalue field is where the user enters his/her numbers via Access. There is an IncomeAndExpenseCodes table as well which holds item information, including the itemID and entry unit of measure. Some itemIDs have an entry unit of measure of $/mo, while others are entered in terms of $/yr, others in %/yr.
For itemvalues of itemIDs with entry units of measure that are not $/mo a stored procedure performs calculations which converts them into numbers that has a unit of measure of $/mo and updates IncomeAndExpenseData putting these numbers in the monthitemvalue field. This stored procedure is written to only calculate values for monthitemvalue fields which are null in order to avoid recalculating every single row in the table.
If the user edits the itemvalue field there is a trigger on IncomeAndExpenseData which sets the monthitemvalue to null so the stored procedure recalculates the monthitemvalue for the changed rows. However, it appears this trigger is also setting monthitemvalue to null after the stored procedure updates the IncomeAndExpenseData table with the recalculated monthitemvalues, thus wiping out the answers.
How do I write a trigger that sets the monthitemvalue to null only when the user edits the itemvalue field, not when the stored procedure puts the recalculated monthitemvalue into the IncomeAndExpenseData table?
I have some simple files but they are failing because the delete history task is failing as it is looking for files in a non existent directory.
It is looking for files in C:Program FilesMicrosoft SQL ServerMSSQL10_50.INSTANCEMSSQLLog whereas it should be looking in C:Program FilesMicrosoft SQL ServerMSSQL10_50.MSSQLSERVERMSSQLLog
how I can get this corrected so I can get the Maintenance Plans to run correctly.
I have tried deleting and recreating the Plan but to no avail
Hi...
I have data that i am getting through a dbf file. and i am dumping that data to a sql server... and then taking the data from the sql server after scrubing it i put it into the production database.. right my stored procedure handles a single plan only... but now there may be two or more plans together in the same sql server database which i need to scrub and then update that particular plan already exists or inserts if they dont...
this is my sproc...
ALTER PROCEDURE [dbo].[usp_Import_Plan]
@ClientId int,
@UserId int = NULL,
@HistoryId int,
@ShowStatus bit = 0-- Indicates whether status messages should be returned during the import.
AS
SET NOCOUNT ON
DECLARE
@Count int,
@Sproc varchar(50),
@Status varchar(200),
@TotalCount int
SET @Sproc = OBJECT_NAME(@@ProcId)
SET @Status = 'Updating plan information in Plan table.'
UPDATE
Statements..Plan
SET
PlanName = PlanName1,
Description = PlanName2
FROM
Statements..Plan cp
JOIN (
SELECT DISTINCT
PlanId,
PlanName1,
PlanName2
FROM
Census
) c
ON cp.CPlanId = c.PlanId
WHERE
cp.ClientId = @ClientId
AND
(
IsNull(cp.PlanName,'') <> IsNull(c.PlanName1,'')
OR
IsNull(cp.Description,'') <> IsNull(c.PlanName2,'')
)
SET @Count = @@ROWCOUNT
IF @Count > 0
BEGIN
SET @Status = 'Updated ' + Cast(@Count AS varchar(10)) + ' record(s) in ClientPlan.'
END
ELSE
BEGIN
SET @Status = 'No records were updated in Plan.'
END
SET @Status = 'Adding plan information to Plan table.'
INSERT INTO Statements..Plan (
ClientId,
ClientPlanId,
UserId,
PlanName,
Description
)
SELECT DISTINCT
@ClientId,
CPlanId,
@UserId,
PlanName1,
PlanName2
FROM
Census
WHERE
PlanId NOT IN (
SELECT DISTINCT
CPlanId
FROM
Statements..Plan
WHERE
ClientId = @ClientId
AND
ClientPlanId IS NOT NULL
)
SET @Count = @@ROWCOUNT
IF @Count > 0
BEGIN
SET @Status = 'Added ' + Cast(@Count AS varchar(10)) + ' record(s) to Plan.'
END
ELSE
BEGIN
SET @Status = 'No information was added Plan.'
END
SET NOCOUNT OFF
So how do i do multiple inserts and updates using this stored procedure...
Regards
Karen
If I have 5000 rows to update with different values based upon the primary key, is there a better way to do it than 5000 separate update statements?
View 2 Replies View RelatedDoes anyone know what the best way to do mass updates in SQL server is? I am currently using the methodology suggested in this article
http://www.tek-tips.com/faqs.cfm?fid=3141
But the article is assuming that once I update a field it is going to have a value that is NOT NULL. So I can loop through and update the rows that have a NOT NULL value. But my updated rows do contain NULL values, in this case what is the best way to go about this???
***************************************
Here is my code. I want to avoid using Upd_flag becos
after the following code runs I need to reset that flag
before I run my next query
***************************************
--Set rowcount to 50000 to limit number of inserts per batch
Set rowcount 50000
--Declare variable for row count
Declare @rc int
Set @rc=50000
While @rc=50000
Begin
Begin Transaction
--Use tablockx and holdlock to obtain and hold
--an immediate exclusive table lock. This usually
--speeds the insert because only one lock is needed.
update t_PGBA_DTL With (tablockx, holdlock)
SET t_PGBA_DTL.procedur = A.[Proc code],
t_PGBA_DTL.Upd_flag = 1
FROM t_PGBA_DTL
INNER JOIN CPT_HCPCS_I9_PROC_CODES A
ON t_PGBA_DTL.PROC_CD
= A.[Proc code]
WHERE t_PGBA_DTL.Upd_flag = 0
--Get number of rows updated
--Process will continue until less than 50000
Select @rc=@@rowcount
--Commit the transaction
Commit
End
MERRY CHRISTMAS EVERYONE :)
I need to update a table on our Test Server which is GCSQLTEST, with another table thats on our live server GCSQL. How would I go about doing that in a stored procedure??
CREATE PROCEDURE [InsertRevised_MainTable]
AS
INSERT INTO dbo.RevisedMainTable
([IR Number], [Date], [I/RDocument], [Violation Type])
SELECT [Incident Report No], [Date], [I/RDocument], TypeOfIncident
FROM dbo.RevisedMainTable
WHERE NOT EXISTS (SELECT * FROM dbo.RevisedMainTable
WHERE [IR Number] = [IR Number])
Our IT guy insists that he must be present anytime the SQL Server automatic updates from Microsoft are installed on the server or the server will crash. What has he been tinkering with to cause this to happen or is he just giving us a line?
View 8 Replies View RelatedHere's the scenario:
* I have a database with a table
* I have a C# program which displays information about the data in the database
* If the data changes in the database, I wish for the client to pick it up and report the change
Is there a way to have some form of 'Event Handling' where the client will react to UPDATE queries on a table?
My thanks in advance.
I'm developing a web app using ASP.NET and SQL Server 2005 Express. So far it's all been on my local computer, it hasn't gone live yet, so if I need to add a column to a table or make some other schema change I just do it right in Visual Studio, nice and simple. If I have to delete all the old content and start over, no problem. When I deploy it to a staging server I just overwrite the existing file with my new one, losing its data in the process. But soon enough I'll be deploying this to a public web server, there will be real live data in the db, people using it when I need to make updates.
What are some common strategies for updating the schema of a database on a live server?
It's obvious that when I need to update the db I'll have to shut down the site temporarily. But my biggest question is how to keep the existing data from the live db? I obviously can't overwrite it with my local copy. I want to overwrite its schema, without touching its data. How's that done?
Thanks for some advice!
Nate
Can some one give me an over view of what I need to do:
Lets say I have a web form with the field: Arrival Date
A web user enters an arrival date of 2/10/06
How do I do a stored procedure that accepts that arrival date and lets me know (by an alert or email) 24 hrs in advance of the arrival date?
I'm using MS SQLEXPRESS 2005. Everyting worked fine: I could connect to it from Access and VS 2005. After updates (SQLEXPRESS SP2) I can't connect to it. Error:
Connection failed:
SQLState: 01000
SQL Server error: 2
[Microsoft][ODBC SQL Server Driver][DBNETLIB]ConnectionOpen(Connect))
Connection failed:
SQLState: `08001
SQL Server error: 17
[Microsoft][ODBC SQL Server Driver][DBNETLIB]SQL Server does not exists or access denied
It applies to SQL SERVER too.
Pls help.
Dear MSDN Support,
Here i am back with an inquiry about the last process of Merge Replication between SQL Mobile 2005 and SQL Server 2005.
Well i have performed all the steps found in the tutorial of the SQL Mobile Edition Books Online, and everything went on so fine and smooth. Now when i deploy my application on the Pocket PC emulator all possible SQL queries work and modify the data only in the emulator, i had installed ActiveSync 4.0 and it synchronizes the SQL Mobile data with the SQL Mobile server only when i copy the database from the emulator to my desktop, and this way is not efficient to my project, i need a better way to synchronize the data between the database on the emulator and that on the SQL Mobile Server.
I'll be looking forward to getting your help as soon as possible.
Thank you for your attention.
Best Regards;
Hello!
We just upgraded to SQL Server 2005 from SQL Server 2000. The DB was backed up using Enterprise Manager and restored with SQL Server Management Studio Express CTP. Everything went as expected (no errors, warnings, or any other indicator of problems).
The DB resides in a DB Server (Server1) and the application we are running is a Client/Server system where the AppServer resides on Server2.
During the application's operation all read, create, and delete transactions work fine but no update works. When viewing details in Trace Log I see this message after attempting any update:
Could not find server 'Server1' in sysservers. Execute sp_addlinkedserver to add the server to sysservers. (7202)
Any help is greatly appreciated,
Lucio Gayosso
Hi All,
I'm a relative novice on SQL Server and am a complete beginner at SQL, so am looking for a little help.
I currently use a DTS package to perform inserts / updates to a "production" table.
The DTS package transforms a comma separated file into a "temporary" table that is truncated / cleared before the load starts.
The temporary table has a column denoting Insert or Update. The production table is almost identical, however, doesn't contain the Insert / Update column. The DTS package then, depending upon the Insert / Update flag, either inserts data into the production table or updates data in the production table.
When the DTS package has completed, I'd like to be able to run an SQL Query that validates everything in the "temporary" table is identical to that in the "production" table, which it should be.
I have managed to do some queries to verify that everything has loaded / updated i.e. select primary_key from temporary table where primary_key not in (select * from production table), however, what I haven't been able to do is verify that all the columns on the temporary table match the values in the production table (excluding the Insert / Update flag).
I tried concatenating the columns in each table and comparing the concatenated values, however, this failed due to the different data-types, i.e. decimal, text etc.
Any help will be greatly appreciated.
Many thanks.
Cheers,
David
When one process has one record locked in Update-Mode then an other process can't update any other records on that table with some queries, other queries that access the same records (but with a different WHERE statement) will execute.
This problem occurs with SQL Server 2005, but it didn't with SQL Server 2000 (or any other database).
The problem:
-Process 1 locks a record in the table, and keeps it in Update-Mode, because the user is editing it. (Using OLEDB Pessimistic Cursor-locking)
-Process 2 wants to update an other record, buts gets a "Lock timeout" when using one query but not with another.
For example this query will work :
UPDATE gwseqnumber SET nextseqnr = 3 WHERE row_id = 110;
But this qeury will give me a "Lock timeout" :
UPDATE gwseqnumber SET nextseqnr = 3 WHERE name = 'REC_2';
But it is the same record!!
The record with name = 'REC_2' has the row_id = 110, both values are unique in the table.
The data:
The table [gwseqnumber] has the following CREATE statement:
CREATE TABLE GWSEQNUMBER
(
NEXTSEQNR INTEGER,
NAME CHAR (20),
ADMINISTRATIONCODE INTEGER,
FINDHIGHESTNUMBER CHAR (1),
CLOSEDYN CHAR (1),
ROW_ID INT IDENTITY(1,1) NOT NULL
);
CREATE INDEX KEY_1 ON GWSEQNUMBER (NEXTSEQNR);
CREATE UNIQUE KEY_2 ON GWSEQNUMBER (ADMINISTRATIONCODE, NAME, IDENTIFIER);
CREATE UNIQUE INDEX KEY_3 ON GWSEQNUMBER (ROW_ID);
Both KEY_2 and KEY_3 are unique, KEY_1 is not.
If I remove the index on the NEXTSEQNR column (the index named KEY_1) then both these queries will work, so it is obviously related to the index.
Altough the index is obsolete and can be removed from this table, it should not result in bogus locking errors.
Even when i removed the index not all the queries will work. (With work i mean not run into a locking error, while the record is not even locked.)
Solutions tried:
- Set the compaitiblity level of the databsae back to 80 (for SQL Server 2000 compatibility).
- I have already tried to disable Page-Locking on all the indexes of this table.
So why does the index lock my updates in SQL Server 2005?
And how do i fix it so my database does not run into these locks?
I am basically trying to update a table which reflects account transactions. Accounts get paid in full but occasionally balance payments can be reversed and I want to update the table to show this - I need to show which period the account was previously paid in full.I've created a simplified version of the scenario and below are a couple of examples of things I've tried that do not work. I understand why they do not work but I'm struggling to figure out how to update the 'PeriodPrevPaidInFull' field.
create table Trans
(
AccNo int,
Transaction_Period_Index int,
PeriodOpeningBalance money,
DebtBalance money,
PeriodPaidInFull int NULL,
PeriodPrevPaidInFull int NULL,
[code]...
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Rgds
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