Synchronize Two Tables Using CLR Triggers
Feb 14, 2008
Hi,
I have decided to use CLR Triggers to synchronize data between two different tables but I have a problem. The scenario is this. I do an insert in Table1. Table1 firest the trigger which then inserts a record in Table2. The trigger in Table2 fires a trigger which does an insert to Table1 again.
I need to find a way to disable the trigger so that it will not go in an infinite loop when I insert a record in either of the tables. What I have done so far is to disable Table2's trigger before I commit my insert to Table2 so that Table2's trigger won't fie. I will then enable the trigger after the insert is committed. Also, I have a webservice which manages the inserts/updates/deletes. I call webmethods from this webservice in my clr triggers.
Help please!
Thanks,
Ryan
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Aug 8, 2005
Using a web interface, I am placing text into a SQL database. From timeto time, I would like to synchronize one of my other tables in thedatabase with the table that I am inserting content into. What is theSQL command to synchronize these tables? I will be initiating thiscommand through a web interface, so I cannot use enterprise manager.Thank you very much!
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Nov 8, 2006
Hi,
I have a little problem. I need to synchronize data from two tables with different table structures meaning they may or may not have the same column name and/or table name. I have read a lot of midware tools which I can use but is there a way inside sql server where I can do this? And this synchronization should be automated. Like when I update one table, it will automatically update the other table with the data that was changed. I know I can manually update the records but is there an automated way that I can do this? I have also read about integration technologies supported by sql server like ssis and replication but it seems complicated and I dont have the luxury of time to learn these. But if these can be the answer to my questions then I guess I dont have a choice. Please help. Newbie in sql. Thanks!
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Apr 24, 2007
i have 2 db's that are totally different except that they both have a table users and I want to make it that anytime the user table is updated or added to in one db - that it is copied over to the other db.
is this possible?
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Jul 23, 2005
Hi, anybody can help me.How can i synchronize 2 tables on 2 different sql servers 2000i mean TABLE1(col1, col2, col3, col4) andTABLE1(col1, col2, col3, col4, col5, col6)the first 3 colums are the same in rwo tables.Thanks--Message posted via http://www.sqlmonster.com
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May 18, 2003
Hello, everyone. I am sorry I haven't been around for long but I have got this confusion. I haven't been able to set triggers between 2 tables.
I have got a set of data in 1 table and another set in the other table. I want to set the trigger by comparing the data column from one table to another.
All I want to know is is ti possible to do it? Because I have been told that I can only set triggers on only one table.
Any help is much appreciated.
Thanks in advance.
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Apr 20, 1999
I'm thinking of building a trigger against a system table(sysobjects) in
database(a) on server(a) that will assist me in updating a table in
database(b)on server(b). What I need to know from table(b)is if a new table
has been added and removed from database(a) on server(a). I want to use a
store procedure to query the table(b). I was thinking of building a trigger
against my sysobjects table that would update table(b) whenever any tables
are added or removed from database(a). Has anyone built triggers against
system tables? I am running SQL 7.
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Jul 23, 2005
Dear Group,I would like to create an audit table that is created with a trigger thatreflects all the changes(insert, update and delete) that occur in table.Say I have a table withSubject_ID, visit_number, dob, weight, height, User_name, inputdateThe audit table would have .Subject_ID, visit_number, dob, weight, height, User_name, inputdate,edit_action, edit_reason.Where the edit_action would be insert, update, delete; the edit_reason wouldbe the reason given for the edit.Help with this would be great, since I am new to the world of triggers.Thanks,Jeff
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Apr 15, 2008
How can we write triggers on system table dbo.sysobjects,
when i tries to write a trigger, it is giving an error that permission is denied.
I even give a permission of "allow modifications to system catalogs" in Enterprise manager.
still it is not giving permission.
How can i create a trigger on dbo.sysobjects table?
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Feb 27, 2002
Does anyone know if it's possible to create a trigger on the sysdatabases table in the master database? I keep getting permission denied which I'm not sure is right.
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Mar 1, 2002
Hi,
Does anyone know of a way I can create a trigger on a system table (say sysdatabases in master). I know this is not supported but presumably there's a way it can be done by referencing it's equivilant in Information_schema somewhere.
I'm trying to write a script that will automatically set up a backup schedule for a database that has just been created. I was hoping the trigger would query the sysdatabases table for new database name entries, log necessary info in an audit table and then call a backup script to set up the schedule. Any ideas??
Thanks
Rob
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Mar 22, 2000
I am reading the WROX "Professional SQL Server 7 Programming" book.
The following code appears on page 424:
CREATE TRIGGER ProductIsRationed
ON Products
FOR UPDATE
AS
IF EXISTS
(
SELECT 'True'
FROM Inserted i
JOIN Deleted d
ON i.ProductID = d.ProductID
WHERE (d.UnitsInStock - i.UnitsInStock) > d.UnitsInStock / 2
AND d.UnitsInStock - i.UnitsInStock > 0
)
BEGIN
RAISERROR('Cannot reduce stock by more than 50%% at once.',16,1)
ROLLBACK TRAN
END
The trigger fires when an UPDATE is made to Products table. The author states that the Inserted and Deleted tables only exist for the life of the trigger, not before, and not after the trigger runs. If this is true, then why would there be any rows in the Deleted table in this case? No rows were
deleted within the trigger. As far as I can see, no rows have been updated
either. If the condition does exist, no rows will be updated, and an error will be displayed. Otherwise, the row will be updated. Then there would be a row in the inserted table. But then the trigger is finished and the inserted table for that trigger disappears. I think my logic is flawed, which is why I am writing. I don't think I fully understand the Inserted and Deleted tables.
Any help would be greatly appreciated.
Nathan
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Jul 8, 2003
how do i return only the tables created by the user?
in three of my databases i am inserting one record per 5 secs. in all the tables. how good is using triggers for 'insert instead of' for these tables?
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May 4, 2004
I have a table "PageInfo" wich has columns "PageID, Title(has "AboutUs" as one of the values), DateModified, Active". My other table is "AboutUs" and has columns "ID, WhatsNew, Welcome, Active".
My goal here is that if table "AboutUs" is affected as an "INSERT" or an "UPDATE" on any row, I want "PageInfo.DateModified" WHERE "PageInfo.Title = AboutUs" to be updated with "getDate()". Don't know if I'm clear enough but thanks in advance.
Gazzou
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Apr 24, 2008
Hello,
I am trying to create a stored procedure that will disable triggers on any given table. Basically I want to pass in a table name as a parameter and query the master table for all triggers that belong to that table...then disable them. I just don't know how to get a list of triggers that belong to a table?
Thanks,
Andrew
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Jul 20, 2005
When you import data using DTS into a table that has triggers - do the triggers fire off if there are triggers for on insert or on after insert?Thanks,--Micah
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Jul 20, 2005
i'm in a bit of a bind at work. if anyone could help, i'd greatlyappreciate it.i have a web app connecting to a sql server using sql serverauthentication. let's say, for example, my login/password isdbUser/dbUser. the web app however, is using windows authentication.so if I am logged into the network as 'DOMAINEric', when I access myweb app, my web app knows that I am 'DOMAINEric'. but to the sqlserver db, I am user 'dbUser'.now, i for each table i have, i need to implement an audit table torecord all updates, inserts, deletes that occur against it. i wasgoing to do so with triggers. this is all fine for selects, inserts,and updates. for each table, i have an updatedby and an updatedate.for example, let's say i have a table:create table blah(id int,col1 varchar(10),updatedby varchar(30),updatedate datetime)and corresponding audit table:create audit_blah(id int,blah_id int,blah_col1 varchar(10),blah_updatedby varchar(1),blah_updatedate datetime)for update and insert triggers, i can know what to insert into theupdatedby column of audit_blah because it's in a corresponding row inblah. my web app knows what user is accessing the application, andcan insert that name into blah. blah's trigger will then insert thatname into audit_blah.however, in the case of a delete, i'm not passing in an 'updatedby',because i'm deleting. in this situation, how can the trigger knowwhat user is deleting? the db only knows that sql user 'dbUser' isdeleting, but doesn't know that 'dbUser' is deleting on behalf of'DOMAINEric'. is there any way for my app to inform the trigger toaccess my windows identity without having a corresponding row in thetable from which to pull that info?obviously, i could have each of my app's users log into SQL serverthrough Windows authentication; then i could just use SYSTEM_USER.but let's say, for performance's sake, it'd be better for me to useone sql server login. (i believe one user works better for connectionpooling purposes.) is there a way to get around this?(i'm hoping a built-in function exists that solves all my problems.)suggestions? resources?any help would be great appreciated.happy turkeys.Eric
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Dec 18, 2007
I'm know the above tables are system generated, am I right in assuming the following.
1) The tables are unique to the current user.
2) The tables only last as long as the transaction that caused their creation
Thanks in advance
Alex
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Apr 29, 2004
I have a situation that I must resolve. I have a program being used by many but I had to create a new table to provide a new feature. The problem I have is this table must use the primary key from the parent table as its primary key, meaning when a user adds a new record to parent table, I need to instantly add the primary key to the child table. Now this was done in the program using sql statements, but I need to implement a trigger or such as to keep me from having to reinstall application on many computers.
basically person inserts new record, then I need to get the new primary ket and add insert it into the child tables. how can I do this with a trigger. I have tried to use an insert into statment with my trigger, but I can't seem to pass the parameters correctly.
CREATE Trigger dbo.Table_Borrower_Insert_Keys
ON Table_Borrower
AFTER INSERT
AS
begin
declare @bid as int
@bid = select MAX(BorrowerID)
FROM Table_SoldProgression
INSERT Table_SoldProgression(BorrowerID)
values (@bid)
end
GO
another attempt
CREATE Trigger dbo.Table_Borrower_Insert_Keys
ON Table_Borrower
AFTER INSERT
AS
INSERT Table_SoldProgression(BorrowerID)
values (select MAX(BorrowerID)FROM Table_Borrower)
GO
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Sep 11, 2001
I want to compare the before and after values of an UPDATEd column using a trigger. I want to know if the value in the column has changed. Simple? No!
As you know, SqlServer puts the before image of the UPDATEd rows into the DELETED virtual table and the after image of the UPDATEd rows in the INSERTED virtual table.
So you would get the before and after data by doing a SELECT on these tables.
But here is the problem - how do you join the tables? What if there are >1 rows in these 2 tables (because the UPDATE affected >1 rows) - how do i know which "old"/DELETED rows correspond to which "new"/INSERTED?"
Ok - I could join the 2 tables on the primary key, but what if the primary key was updated? In that case the join would not work - the DELETED table would contain the old primary key value and the INSERTED table would contain the new (different) primary key value. In fact, ALL of the columns may have been changed by the UPDATE.
Now, there is another thing to try with triggers - the
IF UPDATE ( <columname> )
test. This is designed to tell you if a specified column was UPDATEd by the last UPDATE. However, this will return TRUE for any UPDATE that mentions the column - even if the UPDATE does not change any data! So I cannot determine whether a certain column has had its value changed with this either.
So then you can try another test mentioned in the docs for CREATE TRIGGER - the
IF COLUMNS_UPDATED()
test. However, this will report that a column has been updated, NOT whether the data has changed as aresult of that UPDATE.
So if you UPDATE the value in the column to the same value as it was beforehand (admittedly, a pointless thing to do, but it could happen in some apps), this fuction will say, yes, this column was updated.
So my question remains - how do I know if the data has changed in a column after an UPDATE, using a trigger?
Any ideas?
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May 30, 2007
For my company, we have made it a standard to create history tables and triggers for the majority of our production tables. I recently grew tired of consistently spending the time needed to create these tables and triggers so I invested some time in creating a script that would auto generate these.
We recently launched a project which required nearly 100 history tables & triggers to be created. This would have normally taken a good day or two to complete. However, with this script it took a near 10 seconds. Here are some details about the script.
The code below creates a stored procedure that receives two input parameters (@TableName & @CreateTrigger) and performs the following actions:
1) Queries system tables to retrieve table schema for @TableName parameter
2) Creates a History table ("History_" + @TableName) to mimic the original table, plus includes additional history columns.
3) If @CreateTrigger = 'Y' then it creates an Update/Delete trigger on the @TableName table, which is used to populate the History table.
/************************************************************************************************************
Created By: Bryan Massey
Created On: 3/11/2007
Comments: Stored proc performs the following actions:
1) Queries system tables to retrieve table schema for @TableName parameter
2) Creates a History table ("History_" + @TableName) to mimic the original table, plus include
additional history columns.
3) If @CreateTrigger = 'Y' then it creates an Update/Delete trigger on the @TableName table,
which is used to populate the History table.
******************************************* MODIFICATIONS **************************************************
MM/DD/YYYY - Modified By - Description of Changes
************************************************************************************************************/
CREATE PROCEDURE DBO.History_Bat_AutoGenerateHistoryTableAndTrigger
@TableName VARCHAR(200),
@CreateTrigger CHAR(1) = 'Y' -- optional parameter; defaults to "Y"
AS
DECLARE @SQLTable VARCHAR(8000), @SQLTrigger VARCHAR(8000), @FieldList VARCHAR(6000), @FirstField VARCHAR(200)
DECLARE @TAB CHAR(1), @CRLF CHAR(1), @SQL VARCHAR(1000), @Date VARCHAR(12)
SET @TAB = CHAR(9)
SET @CRLF = CHAR(13) + CHAR(10)
SET @Date = CONVERT(VARCHAR(12), GETDATE(), 101)
SET @FieldList = ''
SET @SQLTable = ''
DECLARE @TableDescr VARCHAR(500), @FieldName VARCHAR(100), @DataType VARCHAR(50)
DECLARE @FieldLength VARCHAR(10), @Precision VARCHAR(10), @Scale VARCHAR(10), @FieldDescr VARCHAR(500), @AllowNulls VARCHAR(1)
DECLARE CurHistoryTable CURSOR FOR
-- query system tables to get table schema
SELECT CONVERT(VARCHAR(500), SP2.value) AS TableDescription,
CONVERT(VARCHAR(100), SC.Name) AS FieldName, CONVERT(VARCHAR(50), ST.Name) AS DataType,
CONVERT(VARCHAR(10),SC.length) AS FieldLength, CONVERT(VARCHAR(10), SC.XPrec) AS FieldPrecision,
CONVERT(VARCHAR(10), SC.XScale) AS FieldScale,
CASE SC.IsNullable WHEN 1 THEN 'Y' ELSE 'N' END AS AllowNulls
FROM SysObjects SO
INNER JOIN SysColumns SC ON SO.ID = SC.ID
INNER JOIN SysTypes ST ON SC.xtype = ST.xtype
LEFT OUTER JOIN SysProperties SP ON SC.ID = SP.ID AND SC.ColID = SP.SmallID
LEFT OUTER JOIN SysProperties SP2 ON SC.ID = SP2.ID AND SP2.SmallID = 0
WHERE SO.xtype = 'u' AND SO.Name = @TableName
ORDER BY SO.[name], SC.ColOrder
OPEN CurHistoryTable
FETCH NEXT FROM CurHistoryTable INTO @TableDescr, @FieldName, @DataType,
@FieldLength, @Precision, @Scale, @AllowNulls
WHILE @@FETCH_STATUS = 0
BEGIN
-- create list of table columns
IF LEN(@FieldList) = 0
BEGIN
SET @FieldList = @FieldName
SET @FirstField = @FieldName
END
ELSE
BEGIN
SET @FieldList = @FieldList + ', ' + @FieldName
END
IF LEN(@SQLTable) = 0
BEGIN
SET @SQLTable = 'CREATE TABLE [DBO].[History_' + @TableName + '] (' + @CRLF
SET @SQLTable = @SQLTable + @TAB + '[History' + @FieldName + '] [INT] IDENTITY(1,1) NOT NULL,' + @CRLF
END
SET @SQLTable = @SQLTable + @TAB + '[' + @FieldName + '] ' + '[' + @DataType + ']'
IF UPPER(@DataType) IN ('CHAR', 'VARCHAR', 'NCHAR', 'NVARCHAR', 'BINARY')
BEGIN
SET @SQLTable = @SQLTable + '(' + @FieldLength + ')'
END
ELSE IF UPPER(@DataType) IN ('DECIMAL', 'NUMERIC')
BEGIN
SET @SQLTable = @SQLTable + '(' + @Precision + ', ' + @Scale + ')'
END
IF @AllowNulls = 'Y'
BEGIN
SET @SQLTable = @SQLTable + ' NULL'
END
ELSE
BEGIN
SET @SQLTable = @SQLTable + ' NOT NULL'
END
SET @SQLTable = @SQLTable + ',' + @CRLF
FETCH NEXT FROM CurHistoryTable INTO @TableDescr, @FieldName, @DataType,
@FieldLength, @Precision, @Scale, @AllowNulls
END
CLOSE CurHistoryTable
DEALLOCATE CurHistoryTable
-- finish history table script with standard history columns
SET @SQLTable = @SQLTable + @TAB + '[HistoryCreatedOn] [DATETIME] NULL,' + @CRLF
SET @SQLTable = @SQLTable + @TAB + '[HistoryCreatedByUserID] [SMALLINT] NULL,' + @CRLF
SET @SQLTable = @SQLTable + @TAB + '[HistoryCreatedByUserName] [VARCHAR](30) NULL,' + @CRLF
SET @SQLTable = @SQLTable + @TAB + '[HistoryAction] [CHAR](1) NOT NULL' + @CRLF
SET @SQLTable = @SQLTable + ' )'
PRINT @SQLTable
-- execute sql script to create history table
EXEC(@SQLTable)
IF @@ERROR <> 0
BEGIN
PRINT '******************** ERROR CREATING HISTORY TABLE FOR TABLE: ' + @TableName + ' **************************************'
RETURN -1
END
IF @CreateTrigger = 'Y'
BEGIN
-- create history trigger
SET @SQLTrigger = '/************************************************************************************************************' + @CRLF
SET @SQLTrigger = @SQLTrigger + 'Created By: ' + SUSER_SNAME() + @CRLF
SET @SQLTrigger = @SQLTrigger + 'Created On: ' + @Date + @CRLF
SET @SQLTrigger = @SQLTrigger + 'Comments: Auto generated trigger' + @CRLF
SET @SQLTrigger = @SQLTrigger + '***********************************************************************************************/' + @CRLF
SET @SQLTrigger = @SQLTrigger + 'CREATE TRIGGER [Trigger_' + @TableName + '_UpdateDelete] ON DBO.' + @TableName + @CRLF
SET @SQLTrigger = @SQLTrigger + 'FOR UPDATE, DELETE' + @CRLF
SET @SQLTrigger = @SQLTrigger + 'AS' + @CRLF + @CRLF
SET @SQLTrigger = @SQLTrigger + 'DECLARE @Action CHAR(1)' + @CRLF + @CRLF
SET @SQLTrigger = @SQLTrigger + 'IF EXISTS (SELECT ' + @FirstField + ' FROM Inserted)' + @CRLF
SET @SQLTrigger = @SQLTrigger + 'BEGIN' + @CRLF
SET @SQLTrigger = @SQLTrigger + @TAB + 'SET @Action = ''U''' + @CRLF
SET @SQLTrigger = @SQLTrigger + 'END' + @CRLF
SET @SQLTrigger = @SQLTrigger + 'ELSE' + @CRLF
SET @SQLTrigger = @SQLTrigger + 'BEGIN' + @CRLF
SET @SQLTrigger = @SQLTrigger + @TAB + 'SET @Action = ''D''' + @CRLF
SET @SQLTrigger = @SQLTrigger + 'END' + @CRLF + @CRLF
SET @SQLTrigger = @SQLTrigger + 'INSERT INTO History_' + @TableName + @CRLF
SET @SQLTrigger = @SQLTrigger + @TAB + '(' + @FieldList + ', HistoryCreatedOn, HistoryCreatedByUserName, HistoryAction)' + @CRLF
SET @SQLTrigger = @SQLTrigger + 'SELECT ' + @FieldList + ', GETDATE(), SUSER_SNAME(), @Action' + @CRLF
SET @SQLTrigger = @SQLTrigger + 'FROM DELETED'
--PRINT @SQLTrigger
-- execute sql script to create update/delete trigger
EXEC(@SQLTrigger)
IF @@ERROR <> 0
BEGIN
PRINT '******************** ERROR CREATING HISTORY TRIGGER FOR TABLE: ' + @TableName + ' **************************************'
RETURN -1
END
END
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Jul 23, 2005
We have a partitioned view with 4 underlying tables. The view and eachof the underlying tables are in seperate databases on the same server.Inserts and deletes on the view work fine. We then add insert anddelete triggers to each of the underlying tables. The triggers modifya different set of tables in the same database as the view (differentthan the underlying table). The problem is those triggers aren't firedwhen inserting or deleteing via the view. Inserting or deleteing theunderlying table directly causes the the triggers to fire, but not whenthe tables are accessed as a result of using the view.Am I missing something? The triggers are 'for insert' and 'fordelete'. No 'instead of' or 'after' triggers.
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Mar 6, 2002
I want to be able to duplicate every single record that is inserted or updated in a particular table to another table, but not the delete. Is the best way to set-up a trigger? If so can anyone provide me with an example of how to do this? Also could you just duplicate certain columns in the row I would you have to do all columns?
Thanks for help.
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Sep 11, 2014
I have many new tables for which i need to write Insert,Update and delete triggers manually. Is there any way to generate triggers script which takes table name as a input parameter and print/generate trigger's script?
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May 14, 2015
I am trying to run a test migration of our application from V8 to V9. To do this I am creating an empty database by running the Tasks -> Script database
Once that is done, I restore it to our dev server and run SQLCompare against it to generate the change scripts
The problem I am facing is that there are a few tables that have encrypted triggers on them and I cannot include them in the generate scripts. I want to take the table structure, including indexes, but I am not interested in the triggers. There are only 5 tables so I could script them by hand, but this means that I cannot automate the process.
As a result of the missing tables SQLCompare will try to generate a CREATE TABLE rather than an ALTER TABLE DDL
The live migration won't be a problem because this will be a database restore and migration - my problem is the CREATE TABLE DDLs in the script.
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Jun 13, 2015
I would like to wrap the following code in a function and reuse it. Â I use this code in many triggers.
DECLARE @Action as char(1);
SET @Action = (CASE WHEN EXISTS(SELECT * FROM INSERTED) AND EXISTS(SELECT * FROM DELETED)
THEN 'U' Â -- Set Action to Updated.
WHEN EXISTS(SELECT * FROM INSERTED)
THEN 'I' Â -- Set Action to Insert.
WHEN EXISTS(SELECT * FROM DELETED)
THEN 'D' Â -- Set Action to Deleted.
ELSE NULL -- Skip. It may have been a "failed delete". Â Â
END)
Is it possible to write a function and pass the INSERTED and DELETED logical tables to it?
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May 12, 2008
This isn€™t an problem as such, it€™s more of a debate.
If a table needs a number of update triggers which do differing tasks, should these triggers be separated out or encapsulated into one all encompassing trigger. Speaking in terms of performance, it doesn€™t make much of an improvement doing either depending upon the tasks performed. I was wondering in terms of maintenance and best practice etc. My view is that if the triggers do totally differing tasks they should be a trigger each on their own.
www.handleysonline.com
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Mar 23, 2004
I have two customer tables in SQL Server, but some of the field names are not the same, that I need to synchronize. Here is how they are structured: (Table 1 is old and Table 2 is new)
Table 1 (900 records)
---------------
cust_code
cust_shipto_code
cust_shipto_name
cust_email
Table 2 (700)
---------------
custcode
loccode
custname
custemail
1. First I need to find out what records exist in Table 1 but not in Table 2 and add them to Table 2.
2. Secondly, I need to then find all records in Table 1 that match the records in Table 2 and update the Email address in Table 2 with the data from Table 1.
Any suggestions on how to do this sync?
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Mar 24, 2004
I am tryign to sync two tables that are in two different databases. It is suppuse to update the record in the [orgloc] table if the customer ship to name has changed in the [opcshto] table. The cust_code would be the unique identifier. in both tables.
this is what I have:
UPDATE [r2lprospector].[dbo].[orgloc]
SET [r2lprospector].[dbo].[orgloc].[custshiptoname] =
[cimpro1].[dbo].[OPCSHTO].[cust_shipto_name]
from [cimpro1].[dbo].[OPCSHTO], [r2lprospector].[dbo].[orgloc]
WHERE [cimpro1].[dbo].[OPCSHTO].[cust_code] = [r2lprospector].[dbo].[orgloc].[custcode]
I keep getting an error though. The error is:
Server: Msg 8152, Level 16, State 9, Line 1
String or binary data would be truncated.
The statement has been terminated.
Any help is appreciated.
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Apr 15, 2007
Hi,
I have a SQL database in my server. One Software is using this database for editing /add / remove items in the database. I would like to put this database in the net (using ASP).
How can I synchronize the SQL database in my server with the same one in remote?
Appreciate your help
Thanks!
Tom
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Sep 11, 2007
Hello, I have 3 tables with their columns: [Articles] > ArticleId, ArticleText [Categories] > CategoryId, CategoryText [CategoriesInArticles] > ArticleId, CategoryId I created a stored procedure that has the following inputs: ArticleId, ArticleCategories ArticleCategories is of type NVARCHAR(Max) and has categories in CSV format: "Category A, Category B, Category C" I have a function, CSVTable, that creates a table with all the categories. I need to make a kind of synchronization: >
Update all categories for the given ArticleId. If any Category is no
longer associated with any ArticleId (In CategoriesInArticles) then
remove it from table Categories.
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Sep 13, 2007
Hi,
I am trying to create a type of synchronization but I am having a lot of problems to make this work.
I have 3 tables:
CREATE TABLE Articles (ArticleId INT, ArticleText NVARCHAR(512))
CREATE TABLE Categories (CategoryId INT, CategoryText NVARCHAR(512))
CREATE TABLE CategoriesInCategories (ArticleId INT, CategoryId INT)
Consider the following tables content:
Articles Table
ArticleId ArticleText
1 Game ended 1-1
2 Book Review
Categories Table
CategoryId CategoryText
1 Sports
2 Entertainment
CategoriesInArticles Table
ArticleId CategoryId
1 1
2 2
I need to create the following procedures:
CreateArticle
Create Procedure [CreateArticle]
@ArticleText NVARCHAR(512),
@ArticleCategories NVARCHAR(MAX)
As
Begin
...
End
This procedure should the the following:
1. Create the article in table Articles
2 .Use the function CSVTable that returns a table with all the categories contained in @ArticleCategories.
For each category check if there is already one with the same CategoryText in table Categories.
If there is just get the CategoryId and add a new record into CategoriesInArticles with ArticleId and found CategoryId.
If there isn't any then create the new Category into table Categories and then add the new record to CategoriesInArticles.
DeleteArticle
Create Procedure [DeleteArticle]
@ArticleId INT
As
Begin
...
End
This procedure should the the following:
1. Delete the article in tables Articles and CategoriesInArticles given its ArticleId
2 .Delete categories from table Categories that are no longer associated with any other article (in table CategoriesInArticles)
UpdateArticle
Create Procedure [UpdateArticle]
@ArticleId INT,
@ArticleText NVARCHAR(512),
@ArticleCategories NVARCHAR(MAX)
As
Begin
...
End
This procedure should the the following:
1. Update the values into Articles Table
2 .Use the function CSVTable that returns a table with all the categories contained in @ArticleCategories.
I think the easiest way is to delete all the categories from ArticleId as it is done in DeleteArticle.
Then It creates the new categories as it is done in CreateArticle.
Consider I create a new article:
EXEC CreateArticle @ArticleText = "Book launched at sports event" @ArticleCategories = "Entertainment, Business"
The tables would become:
Articles Table
ArticleId ArticleText
1 Game ended 1-1
2 Book Review
3 Book launched at sports event
Categories Table
CategoryId CategoryText
1 Sports
2 Entertainment
3 Business
CategoriesInArticles Table
ArticleId CategoryId
1 1
2 2
3 2
3 3
NOTE: Because there is no category named Business in Categories this must be created.
Then I would updated it:
EXEC UpdateArticle @ArticleId = "3" @ArticleText = "Book launched at sports event" @ArticleCategories = "Sports, Tech"
The tables would become:
Articles Table
ArticleId ArticleText
1 Game ended 1-1
2 Book Review
3 Book launched at sports event
Categories Table
CategoryId CategoryText
1 Sports
2 Entertainment
4 Tech
CategoriesInArticles Table
ArticleId CategoryId
1 1
2 2
3 1
3 4
Note: Since Business category is no longer used by any other article then it is also deleted from Categories.
The new Tech category is then created and associated with the updated article as well as the existing category Sports.
Finally I would delete it:
EXEC DeleteArticle @ArticleId = "3"
The tables would become:
Articles Table
ArticleId ArticleText
1 Game ended 1-1
2 Book Review
Categories Table
CategoryId CategoryText
1 Sports
2 Entertainment
CategoriesInArticles Table
ArticleId CategoryId
1 1
2 2
Note: Since Tech category is no longer used by any other article then it is also deleted from Categories.
The Sports category is not deleted from Categories since it is used by Article with Id=1
Well, I hope I didn't miss anything and I explained it well.
I have been trying my code, either by creating a separate procedure named SynchronizeCategories or inside the Create, Delete and Update procedure.
Until now I was not able to make this work.
Here is the code I use in my SynchronizeCategories procedure:
INSERT INTO CategoriesInArticles(CategoryId, ArticleId)
SELECT c.CategoryId, @ArticleId
FROM Categories c INNER JOIN CSVTable(@ArticleCategories) ac
ON c.CategoryText = ac.String
LEFT JOIN CategoriesInArticles cia
ON c.CategoryId= cia.CategoryId
WHERE cia.CategoryId IS NULL
INSERT INTO Categories(CategoryId, CategoryText)
SELECT cia.CategoryId, NULL
FROM CategoriesInArticles cia
JOIN [Categories] c ON c.CategoryId = cia.CategoryId
INNER JOIN CSVTable(@ArticleCategories) ac ON ac.String = c.CategoryText
WHERE c.CategoryId IS NULL
DELETE c
FROM Categories c
INNER JOIN CSVTable(@ArticleCategories) ac ON ac.String = c.CategoryText
LEFT JOIN CategoriesInArticles cia ON c.CategoryId = cia.CategoryId
WHERE cia.CategoryId IS NULL
Could someone, please, help me out with this?
Thank You Very Much,
Miguel
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Apr 17, 2008
Please can somebody help me with the following:
Our company has an enterprize site (a very large one). From time to time we need to make changes in it. In other words, we had to synchronize one database (local where we make all changes) and database on hosting. So, we did it manually (wrote scripts and inserted them in database on hosting). But as the databases grew it became impossible to synchronize everything manually. So we need some tool which could cope with this task. The problem is that, as I know, there are many tools which can do it, but we are tight in time and can't evaluate them all. Please share your ideas on what tool is worth evaluating?
Thanks in advance.
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