Using column names dynamically in Trigger
Hello Everyone,
I want to use a trigger for my application in which column names will be provided dynamically rather than hard coded. i.e. for ex. I want to have foll. code
Execute Immediate
'Begin
dbms_output.put_line'' ' | | :new.col_name | | ' ''); End; ';
where in ":new.col_name" col_name will be replaced dynamically. so if any of you can tell me how to achive this I will be thankful to you. Hoping for the best.
Regards
-Heena
My advise will be to think about using dynamic PL/SQL.
Similar Messages
-
Column names dynamically in Dynamic SQL
Hi All,
We can use Table Name dynamically in Dynamic SQL.
Can we use column names dynamically?
Thanks,
UmasankarHi Todd Barry,
Thanks lot for your immediate response.
Could you please tell me, how can we use column name dynamically?
I tried but, I didnt get the correct result.
Here is my coding.
Declare
SQL_String Varchar2(2000);
Category varchar2(50):= 'ELECTRO_PLATING_413';
Type ConstCurTyp is REF CURSOR;
Const_Cv ConstCurTyp;
vLab_name varchar2(80);
Begin
Execute Immediate 'Truncate table tto_lab_names';
dbms_output.put_line(category);
dbms_output.put_line(' ');
SQL_String := 'Select lab_name from tto_constituents where :category is not null';
Open Const_cv for SQL_String using category;
Loop
Fetch Const_Cv into vLab_Name;
Exit When Const_Cv%NotFound;
Insert into lab_names values(vLab_name);
End Loop;
Commit;
Close Const_Cv;
End;
I am getting all the lab_names as result.
Thanks,
Umasankar
null -
Execute immediate with using clause to pass column name dynamically
Hai,
Is there any way using execute immeidate to pass the column name dynamically. I used to pass the column value as dynamic with the help of "Using clause" . But if i use to pass column name, it is giving numberic error at run time. Eg,. for testing has been given below.
1. Column value as dynamic, which is working correctly.
create or replace function testexeimm (acctnum char)
return number as
acctbal number;
begin
execute immediate 'select balance from acct_master where acct_no=:a' into acctbal using acctnum;
return acctbal;
end;
2. Column name as dynamic which is not working
create or replace function testexeimm (colnam char)
return char as
acctbal char;
begin
execute immediate 'select :a from ch_acct_mast where rownum=1' into acctbal using colnam;
return acctbal;
end;
Any help in this regard will be highly appericated.
Regards
SridharSo the variable has to be numeric too:
create or replace function testexeimm (colnam char)
return number as
acctbal number;
begin
execute immediate 'select '|||colnam||' from ch_acct_mast where rownum=1' into acctbal;
return acctbal;
end;Max
http://oracleitalia.wordpress.com -
Getting the column names dynamically
hi gurus,
i have list item populated with many table names from a schema.
i have grid in oracle forms 10g and i want to fill the grid with the data that should come at least four/more columns.
i want to fire the list change trigger when each time any one table name is selected/changed.
how can i get the column names dynamically
please give me the step by step process
for filling the grid..hi ,
by getting column names dynamically i am creating a record group
using this below query
SELECT COLUMN_NAME, DATA_TYPE FROM USER_TAB_COLUMNS WHERE TABLE_NAME = <table_name>
but when timestamp datatype is there then it is showing error cannot create group groupname
but the record group is running successful on varchar2,number,date dayatypes
if any alternative is there i mean to say without using record group then tell me or where is the problem -
Problem in using table name dynamically in PL/SQL
I tried to create a procedure to use table name dynamically and got the following error. Anything wrong with my procedure?
NFADV>declare
2 cnt number;
3 cursor cur is select table_name from user_tables where table_name in ('EMP','DEPT');
4 begin
5 for c1 in cur
6 loop
7 execute immediate select count(*) into cnt from c1.table_name;
8 dbms_output.put_line('Count is : '||cnt);
9 end loop;
10 end;
11 /
declare
ERROR at line 1:
ORA-06550: line 7, column 21:
PLS-00103: Encountered the symbol "SELECT" when expecting one of the following:
( - + case mod new not null <an identifier>
<a double-quoted delimited-identifier> <a bind variable> avg
count current exists max min prior sql stddev sum variance
execute forall merge time timestamp interval date
<a string literal with character set specification>
<a number> <a single-quoted SQL string> pipe
<an alternatively-quoted string literal with character set specification>
<an alternatively-quo
ORA-06550: line 8, column 5:
PLS-00103: Encountered the symbol "DBMS_OUTPUT"
ORA-06550: line 8, column 45:
PLS-00103: Encountered the symbol ";" when expecting one of the following:
. ( , * % & - + / at mod remainder rem <an identifier>
<a double-quoted delimited-identifier> <an exponent (**)> as
from into || multiset bulkThanks and Regards
KaustubhHi,
The wrong part is in execute immediate, it should be as follows:
execute immediate ('select count(*) from '|| c1.table_name)
into cnt
(not tested)
Regards
AK -
How to use table name dynamically in report procedure
Hello every body
I want to use table name dynamically means at runtime i want to pass table name.
I can do this by lexical parameter in main query.
But my problem is that i want to crate new format trigger or new function that use 1 cursor in which that lexical parameter : table name is used.
so how to do that?
i can not use that lexical parameter it is giving error.
please help me how to do that.Call a database function which you pass the lexical parameter. Then in the database function you use dynamic sql or the execute immediate option to build the SQL string.
Return the information from this function to build your business logic on in your format trigger.
Marcos -
HTML DB Chang column name dynamically
Can I change the column name dynamically. for instance
Today run my apply it will display the title of the columns this
Column title: Wed Thu Fri
04/22/05 04/23/05 04/24/05
Data 45 34 34
54 56 23
Next week
Column title: Wed Thu Fri
05/03/05 05/04/05 05/05/05
45 34 34
54 56 23
The date Change Dynamically?Go to your report and open report atributes. There you can choose the options for column names. Click on the pl/sql function and type this in:
DECLARE v varchar2(20);
begin
v := to_char(SYSDATE, 'dd.mm.yy')||':'||to_char(SYSDATE+1, 'dd.mm.yy');
RETURN v;
END;
This will set the first two columns to the specified dates. You can use this as one option.
If the case is more complicated than you can do the following:
1. create a number of items on your page - hidden
2. compute the items with values once the page is loaded
3. use item substitute string &ITEM. in the column name, which will use the item value as a name for the column.
This way you are more flexible since you can use the item values for some columns only and have the other columns hardcoded.
Denes Kubicek -
Can we use Column Names in Parameter Cursor
Hi
can we use Column Names in Parameter Cursor??
DECLARE
CURSOR Emp_Cur (P_Deptno NUMBER)
IS
SELECT Empno, Ename
FROM Emp
WHERE Deptno = P_Deptno;
BEGIN
FOR Emp IN Emp_Cur(10)
LOOP
DBMS_OUTPUT.PUT_LINE('The Employee Number is: '||emp.Empno);
DBMS_OUTPUT.PUT_LINE('The Employee Name is: '||emp.Ename);
END LOOP;
FOR Emp IN Emp_Cur(20)
LOOP
DBMS_OUTPUT.PUT_LINE('The Employee Number is: '||emp.Empno);
DBMS_OUTPUT.PUT_LINE('The Employee Name is: '||emp.Ename);
END LOOP;
END;
In the above Program, I send Deptnumber. If i send Column names like Empno, Ename. What can i do??
If Declare Samething Through Parameter Cursor, it doesn't accept VARCHAR2(Size)For parameters you don't use size, just the type (DATE, NUMBER, VARCHAR2, CLOB, ...)
DECLARE
CURSOR Emp_Cur (P_Ename VARCHAR2)
IS
SELECT Empno, Ename
FROM Emp
WHERE Ename = P_Ename;
BEGIN
FOR Emp IN Emp_Cur('SCOTT')
LOOP
DBMS_OUTPUT.PUT_LINE('The Employee Number is: '||emp.Empno);
DBMS_OUTPUT.PUT_LINE('The Employee Name is: '||emp.Ename);
END LOOP;
END; -
Pass column names dynamically in report
Hello experts,
I am creating an ALV report where i need to pass the column names dynamically. if the current month is March and year is 2009. the column names should be as below
March 2009 April 2009 May 2009 June 2009 ..............till Feb 2010 (total columns are 12)
if the current month is June and year is 2010 it shoud be displayed as
June 2010 July 2010 Aug 2010................till May2011
I am actually calculating the forecast qty for each month and displaying in a report from the current month.
How to write field catelog for this requirement?
Thanks in Advance.
Rajesh.I think in the fieldcat, at the time of declearation, you can alter the field description depending on the present month.
If present_month = January
wa_fieldcat-reptext_ddic = 'January'. " Field description
elseif present month = February.
wa_fieldcat-reptext_ddic = 'February'. " Field description
on so on.....................
Kuntal -
Variable column name in a trigger
I have a table with many columns, and would like to make a log table of all the updates in the first one. So my idea was to bulid a "before update" trigger which would first create a cursor to get the column names from the user_tab_columns table. In a cursor loop it would check if the :new.column_data is somehow different from :old.column_data. If this was the case, trigger would build a sql statement for inserting old and new values into the log table, and then execute this statement using the "execute immediate".
Here i run into a problem, because i shuld pass the old and new values of a column instead of :new and :old variables, which are not bound in the execute immediate. Any suggestion besides writing a long trigger for checking each and every column name in a table?Or don't create it like this at all.
This way you'll get:
- complex trigger code
- a hard parse each and every insert into that log table
- a trashed shared pool, because it gets populated with all "almost the same" insert statements
Querying a log table probably is not something you do everyday, so it likely doesn't pay to store it in a complex way to make sure the retrieval goes smoothly.
If you want to log, you could do it in a single insert statement with all the information you could possibly need. This makes the code easy and the SQL sharable. It could look like below, and just skip the columns you don't need:
insert into log_table
( action
, action_date
, action_user
, column1_old_value
, column1_new_value
, did_column1_change
, column2_old_value
, column2_new_value
, did_column2_change
, columnN_old_value
, columnN_new_value
, did_columnN_change
values
( case when inserting then 'I' when updating then 'U' when deleting then 'D' end
, sysdate
, user
, :old.column1
, :new.column1
, case when updating('column1') then 'Y' else 'N' end
, :old.column2
, :new.column2
, case when updating('column1') then 'Y' else 'N' end
, :old.columnN
, :new.columnN
, case when updating('columnN') then 'Y' else 'N' end
);Or you can use a flashback archive instead of a log table in 11g, but I don't have enough experience with it yet to fully recommend that one.
Regards,
Rob. -
Using Column Name returned by function in SELECT statement
Hi
Output from my function (RETURN data type is VARCHAR2) is column name. I want to use it directly in my SELECT statement. Below is simplified example of this:
--- Function
CREATE OR REPLACE FUNCTION simple RETURN varchar2 IS
BEGIN
RETURN ‘my_column’;
END simple;
--- Select
SELECT simple FROM my_table;
This does not work. It seems that output from function is passed in quotation i.e.
SELECT ‘my_column’ FROM my_table;
So the output from SELECT is a list of rows populated with values my_table:
COLUMN simple
ROW1 my_column
ROW2 my_column
ROW3 my_column
Can please someone help me with this?I'm not sure I got you right.
In standard SQL everything must be known at compile time. If not dynamic SQL is required, but is a costly operation (usually requires parsing before each execution) so it should better not be used when standard SQL can do it.
I provided a design time example where a function returns the column name from the given the table name and column id for a varchar2 column data type to make things simple. Then a query string is constructed and executed dynymically to return all column values of the chosen table_name.column_name.
SELECT simple FROM my_tableAt compile time the simple function return value is unknown (any varchar2 value would do) you already find out you get the (same) return value (i.e column name) for each table row => dynamic SQL needed to get the column values
The purpose of function would be to rename all columns for provided table.The table name would be provided, right? If yes => dynamic SQL
What is the function supposed to return the column name (where would the new name come from?), the column alias (which table column would be renamed to the new name?)
The user could use the new_column name as the column alias name submitting the query.
Is it possible to do this?Maybe () using a pipelined function (different data types - number,date, ... not cosidered yet) but your simple query;
<tt>SELECT simple FROM my_table</tt>
might look like:
<tt>select my_column_value new_column_name from table(get_column_value(table_name,column_name))</tt>
Sorry, no Database at hand to provide a specific example.
Regards
Etbin -
Using Column Name in a Second Table
I have two tables in a sheet, Data and Report. Data contains a column named Hours. How can I write a sum function in the Report table that sums the values in the Hours column in Data? I'd like to use a named reference instead of a row/column letter/number range for when the Hours column gets longer.
David Benman1 wrote:
Thanks. I tried what you said, but initially it didn't work. I realized I needed to make the top row a header row, but that leads to a new question. All my columns now can be reference by name except the first column. Is there anything special I need to do to the first column? If the first column is "Hours", then when I type in "Hours" in my formula, the spreadsheet doesn't recognize it as a column name.
Yes, you must read the User Guide which explains :
Yvan KOENIG (VALLAURIS, France) 2 septembre 2010 12:06:03 -
How to use column name as variable in select statement
hi,
i want to make a sql query where in select statement using variable as a column name. but its not working plz guide me how can i do this.
select :m1 from table1;
regardsHi,
Is this what you want..
SQL> select &m1 from dept;
Enter value for m1: deptno
old 1: select &m1 from dept
new 1: select deptno from dept
DEPTNO
10
20
30
40
SQL> select &m1 from dept;
Enter value for m1: dname
old 1: select &m1 from dept
new 1: select dname from dept
DNAME
ACCOUNTING
RESEARCH
SALES
OPERATIONS
SQL> select &&m1 from dept;
Enter value for m1: loc
old 1: select &&m1 from dept
new 1: select loc from dept
LOC
NEW YORK
DALLAS
CHICAGO
BOSTON
SQL> select &&m1 from dept;
old 1: select &&m1 from dept
new 1: select loc from dept
LOC
NEW YORK
DALLAS
CHICAGO
BOSTONIf you use single '&' then each time you fire the query, It will ask for the new value..
But if you will use double '&&' the value of m1 will be persistent across the session..
Twinkle -
How to obtain the updated column name in a trigger?
Hello everyone,
I need to know for audit propose the updated column name in a After Update Trigger on a Table.
The table have more than 20 columns, and i think that do more than 20 conditions asking for the difference between the :new value and the :old value is not the best way.
Thanks for the help!
LCJHi,
Thanks to all for the replays.
I didn't know that i can pass the column name to the UPDATING. This is only possible on 10g??
Any way, i pass the column name and works fine, but i have another issue because of that.
I obtain the column name from a cursor that query user_tab_columns view, when i try to obtain the value of the :old or :new, i can't because i don't know how to obtain the value of the value.
This example show better:
DECLARE
vOldValue Varchar2(50);
Cursor cur_Column_Names Is
Select COLUMN_NAME
From User_Tab_Columns
Where TABLE_NAME = 'table_name';
BEGIN
For var_cursor In cur_Column_Names Loop
If Updating(var_cursor.COLUMN_NAME) Then
vOldValue := '?'; -- How obtain the value of the :old. + >var_cursor.COLUMN_NAME??
End If;
End Loop;
END;Thanks to all for the help.
LCJ -
Hello,
Can anyone help me out to write a vb.net script.
I need to read the column names from excel and based on that column names I need to create a table in database(I have more than one sheet in excel).
For each sheet columns will be changing and should create a table dynamically for each sheet.
Any help would be appreciated.Refer the below script to read columns in each sheet.
Dim excelfile As String = Dts.Variables("ExcelPath").Value.ToString
Dim connectionstring As String = "Provider=Microsoft.Jet.OLEDB.4.0;" +
"Data Source=" + excelfile + ";Extended Properties=Excel 8.0"
Dim oledbcon As New OleDb.OleDbConnection(connectionstring)
oledbcon.Open()
Dim dt As DataTable
Dim schemaTable As DataTable
Dim OLEDBCMD As New OleDb.OleDbCommand
Dim oledbdatareader As OleDb.OleDbDataReader
Dim columns As String = ""
dt = oledbcon.GetSchema("Tables")
Dim TABCOMMAND(20) As String
Dim TABCOUNT As Integer = 0
For Each row As DataRow In dt.Rows
TABCOMMAND(TABCOUNT) = "SELECT * FROM [" & row.Item("TABLE_NAME").ToString & "]"
OLEDBCMD.CommandText = TABCOMMAND(TABCOUNT)
OLEDBCMD.Connection = oledbcon
oledbdatareader = OLEDBCMD.ExecuteReader(CommandBehavior.KeyInfo)
schemaTable = oledbdatareader.GetSchemaTable()
For Each myfield As DataRow In schemaTable.Rows
For Each myproperty As DataColumn In schemaTable.Columns
If myproperty.ColumnName = "ColumnName" Then
columns = columns & myfield(myproperty).ToString & ","
MsgBox(myfield(myproperty).ToString)
End If
Next
Next
oledbdatareader.Close()
OLEDBCMD.Dispose()
Next
oledbcon.Close()
Regards, RSingh
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