I need a code on , flag update , i have flag (database column), after the program is successfully then flag need to Update as N, i need add code Button
checked Y
unchecked N
can you please help me?
There is 2 options for updating the database field:
POST-FORMS-COMMIT trigger is fired just after the DML commands (Insert,..) so you can write the code there and update the database flag
At the database level you can create a trigger that contain the column change after update.
Related
I have a table set up to track when people place an order (Order_Tbl). I duplicated the table that I call my order_change_log and added a date/time field (default value set to now). I have a one to many relationship between the orderID and order_change_logID. The idea is that before update, I want the existing data to be inserted into the change log table. I went into the before update field and made the following statement:
CurrentDB.Execute “INSERT into Order_Change_Log SELECT * FROM Order_Tbl WHERE ChangeLog_ID =“”” & Me.ID & “”””
I keep getting “Invalid Outside Procedure” and I’m getting frustrated… Not sure what I’m doing wrong.
What you want to do is called a trigger. In access a table's triggers can be accessed and created from the table's design mode via [Create Data Macros] on the ribbon. You are pretty much forced to use the macro language to create the trigger.
As an aside it looks like you are setting the default date in Order_Change_Log. Leave that default blank as it is not needed here and in many other cases leads to bugs.
In this case we will be using the after-update macro. The Before-Update values are available using [Old]
For an older example of a trigger happening after Delete see MS Access trigger?
Example Table and Relationships:
After Update Trigger Macro:
Use the ribbon to save the macro and you are done. change some values in the Order_Tbl then refresh or open the Order_Change_Log table to see the results
hi2,
Could anyone please show me how to update a dataValue each time a data in another database changes its value ?
Here is a screenshot of my 2 databases
I would like that;
Each time a value in database1-table1 is changing,
It sends a trigger to change the age value in database2-useragetable
I attempt to create a trigger from this link.
Using Trigger to update table in another database
And Here is the code and the screenshot of it.
AFTER UPDATE ON table1.value FOR EACH ROW
BEGIN
UPDATE TABLE database2.useragetable
SET age = NEW.value
WHERE no = NEW.no
END;
Please refer to the following wiki to create a trigger:
https://github.com/phpmyadmin/phpmyadmin/wiki/Trigger
In phpMyAdmin, select the database (database1-table1) that you want to work with.
Go to the SQL tab at the top of the page.
In the "Run SQL query/queries on database" form, change the Delimiter to $$. (Located in a small box at the bottom of the form)
Enter your SQL trigger into the main dialog box on the form.
Hypothetically, I am going to develop a trigger that inserts a record to Table A when an insertion made to an Table A.
Therefore, I want to know how the system handles that kind of loophole or it is going to continue as a loop until the system hangs which requires restart and possibly remove the DB.
I'm trying to gather information on almost every DBMS on this issue or loophole.
I can only speak to Oracle, I know nothing of MySQL.
In Oracle, this situation is known as mutation. Oracle will not spiral into an endless loop. It will detect the condition, and raise an ORA-04091 error.
That is:
ORA-04091: table XXXX is mutating, trigger/function may not see it
The standard solution is to define a package with three functions and a package level array. The three functions are as follows:
initialize - this will only zero out the array.
save_row - this will save the id of the current row (uk or pk) into the arrray.
process_rows - this will go through the array, and actually do the trigger action for each row.
Now, define some trigger actions:
statement level BEFORE: call initialize
row level BEFORE or AFTER: call save_row
statement level AFTER: call process_rows
In this way, Oracle can avoid mutation, and your trigger will work.
More details and some sample code can be found here:
https://asktom.oracle.com/pls/asktom/ASKTOM.download_file?p_file=6551198119097816936
You can only insert a record in same table if you are using instead of trigger. In all other cases you can only modify the record being inserted.
I hope this answers your quest.
you can create trigger in mysql DBMS.
check below link for create insert trigger syntex
http://www.techonthenet.com/oracle/triggers/after_insert.php
I need to create a SQL JOB.
Step1:
Insert a Row into TaskToProcess Table and return ProcessID(PK and Identity)
Step2:
Retrive the ProcessID which is generated in step1 and pass the value to SSIS package and execute the SSIS Package.
Is this Possible in SQL server JOB??
Please help me on this
Thanks in advance.
There is no built-in method of passing variable values between job steps. However, there are a couple of workarounds.
One option would be to store the value in table at the end of step 1 and query it back from the database in step 2.
It sounds like you are generating ProcessID by inserting into a table and returning the SCOPE_IDENTITY() of the inserted row. If job step 1 is the only process inserting into this table, you can retrieve the last inserted value from job 2 using the IDENT_CURRENT('<tablename>') function.
EDIT
If multiple process could insert into your process control table, the best solution is probably to refactor steps 1 and 2 into a single step - possibly with a controlling SSIS master package (or other equivalent technology) which can pass the variables between steps.
Similar to Ed Harper's answer, but some details found in "Variables in Job Steps" MSDN forum thread
For the job environment, some flavor of Process-Keyed Tables (using
the job_id) or Global Temporary Tables seems most useful. Of course,
I realize that you might not want to have something left 'globally'
available. If necessary, you could also look into encrypting or
obfuscating the value that you store. Be sure to delete the row once
you have used it.
The Process-Keyed Tables are described in article "How to Share Data between Stored Procedure"
Another suggestion in Send parameters to SQL server agent jobs/job steps MSDN forum thread to create a table to hold the parameters, such as:
CREATE TABLE SQLAgentJobParms
(job_id uniqueidentifier,
execution_instance int,
parameter_name nvarchar(100),
parameter_value nvarchar(100),
used_datetime datetime NULL);
Your calling stored procedure would take the parameters passed to it
and insert them into SQLAgentJobParms. After that, it could use EXEC
sp_start_job. And, as already noted, the job steps would select from
SQLAgentJobParms to get the necessary values.
Is it true I can't edit a MySQL trigger, I have to drop it and create a new one?
Also, being a relative newcomer to triggers, it feels like they seem liable to causing 'erroneous' data. For example I might want a trigger to be fired (inserting data into another table) after one particular type of update query, but not others.
Any tips here gratefully received!
Edit: Yes, it is true that versions 5.n and 6.n of MySQL 5 & 6 implement CREATE TRIGGER and DROP TRIGGER and nothing else. According to this hunk of Postgres documentation, there is not even CREATE TRIGGER in SQL 92, so consider yourself lucky to have TRIGGER at all :-)
The Visual Studio MySQL plugin documentation has:
To modify an existing trigger, double click on a node of the trigger you wish to modify, or right click on this node and choose the Alter Trigger command from a context menu. Either of the commands opens the SQL Editor.
... which seems to do what you want. My guess is this is GUI sugar and behind the scenes you get a DROP CREATE.
As far as a trigger for some UPDATEs and not others, SQL has exactly one UPDATE per table. Put an IF clause at the start of your UPDATE trigger so that your logic - whatever you are doing in some of your UPDATEs - is only executed when you think it is appropriate.
MySQL has REPLACE TRIGGER, right?
As a sidenote.. Is it an issue? If you're worried queries are executed in between DROP and CREATE, you could always lock the table beforehand.
If you're using MySql Workbench it will allow you to alter the trigger. Just right click on your table name and click Alter table option from there you can pick Trigger option and alter it. Although, you cannot perform it from query mode.
Table Name --> Right Click --> Alter Table --> Triggers.