How to Auto generate "order_id"

I want to Auto generate "order_id" No with sysdate and sequence through pre-insert trigger.
for example:
when user commit transaction 1st time today that auto generate this No
020220101
when 2nd time commit transcation generate this
020220102
3rd time commit transcation generate this
020220103
4th time commit transcation generate this
020220104
when user will commit transaction tomorrow 1st time generat this
030220101
when 2nd time commit transcation generate this
030220102
3rd time commit transcation generate this
030220103
4th time commit transcation generate this
030220104
anyone can help me.

Hi,
Try the following code.
SELECT TO_CHAR(SYSDAYE, 'DDMMRRRR') || NVL(MAX(TO_NUMBER(SUBSTR(ORDER_ID, 9))), 0) + 1 INTO :<block_name>.<field_name> FROM <table_name> WHERE SUBSTR(ORDER_ID, 1, 8) = TO_CHAR(SYSDAYE, 'DDMMRRRR');Regards,
Manu.
If my response or the response of another was helpful, please mark it accordingly

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How to "auto" generate "Primary Key" in custom table?

Hi Folks,
Requirement:
I need a function module or program that can create automatically a primary key.
Scenario:
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Hi Keshu and All,
The links are helpful, however:
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How to auto generate a sequence.

Dear all
The entity Object "OrderEntryEO" has an attribute called"OrdNumber" that indicates the reference number of the order number. the order number is compose be a sequence on the year. For example 1/2011 , 2/2011 , 3/2011 and so on..
this sequence must be auto generated when pressing save button.
I have generated the entityImpl java class "OrderEntryEOImpl.java . with accessors , DO_DML method and create method.
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{code}
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{code}
{code}
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{code}
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Database sequences, regardless of what magic you try (including setting the cache size to 1) can and will, by their very design have gaps. I don't care if you are doing a web app, a client server app, an SOA app, or any other newfangled or old-fashioned, red screens, green screens, blue screens - DATABASE SEQUENCES IN ORACLE CAN AND WILL HAVE GAPS.
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Wenjun,
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LxKaneShiro1 wrote:
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Hi All
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The category of employee i.e., Staff or Worker is captured in the People Group segment in assignments.
I can write a fast formula to auto generate the employee numbers, but as employee number has to be generated first before updating the assignments.
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Hi
Do you have multiple assignments over there?There are no multiple assignments.
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HOW TO GET AUTO GENERATED PRIMARY ID KEY BACK FROM AN INSERT STATEMENT IN .

Just recently I ran into a problem with what seems to be a deficiency in the Oracle Database. When trying to return an auto-generated key as is done in Microsoft's SQL database, it seems Oracle for whatever reason didn't add this capability, the key couldn't be passed back to the .Net call. After tinkering with the .Net software and talking with the Oracle techs, a decent work around to the problem (presented here) comes fairly close. Two things have to be done first before this will work. A sequence has to be created on the Oracle DB. Also a trigger has to be created against the table the keys are going to be returned from.
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Notice the word Inserted. On Updates and Deletes the key value is ignored because it's already present. The routine just updates the database as usual.
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' ======================================================================
' Created by SEF and Oracle SR: 5607364.993 This is a complete Redo
' of the initial concept. SEF...
' Sample of sequence and trigger at bottom.
' Uses the ODP.NET data provider.
' update_datasets_return: Goes thru each table in the dataset and
' updates, deletes, or inserts as needed.
' If inserting, a 'sequence counter' and a 'trigger'
' using the 'before insert' must be present. The sequence
' counter is set to auto increment by 1 starting at 1.
' The trigger is specific to the table.
' Create the trigger and sequence in the database or run the samples
' below in PL/SQL. Be sure the logon with a user that has enough rights.
' Routine assumes the first column is going to hold the sequence
' number. Actually any column could be used. Just change the
' dt.Columns(0).ColumnName to whatever you want or leave as default.
' The da_RowUpdated sub is where the 'sequence number' gets returned
' on each row that is inserted into a table. Routine is ignored on
' deletes and updates. SEF...
' =======================================================================
Imports System
Imports System.Data
Imports Oracle.DataAccess.Client
Imports Oracle.DataAccess.Types
Public Class OracleUpdate
Private Shared m_conn As OracleConnection
Private Shared da As New OracleDataAdapter
Private Shared dt As DataTable
Private Shared conn As New OracleConnection
Private Shared dr As DataRow
Private Shared astep As Long
Private Shared rwIndex As Integer = 0
Private Shared tblIndex As Integer = 0
Public Shared Function update_datasets_return(ByVal constr As String, ByVal ds As DataSet) As DataSet ''ByRef ds As DataSet)
Dim selectstmt As String
m_conn = New OracleConnection(constr)
Try
m_conn.Open()
Catch ex As Exception
Throw New ArgumentException(" Error: connection lost." & ex.Message)
End Try
For Each dt In ds.Tables
''Uncomment the code only if auto numbering
''is NOT turned on for the table being updated. SEF...
''rwIndex = 0
''For Each dr In dt.Rows
'' Try
'' Select Case dr.RowState
'' Case DataRowState.Added
'' astep += 1
'' ' =======================================================
'' ' This "Try Catch" section created only if auto numbering
'' ' is NOT turned on for the table being updated. SEF...
'' ' It's a crude attempt at creating a unique number.
'' ' A more serious approach would be to use a GUID.
'' ' Use only if you decide not to have a sequence and a
'' ' trigger for the table.
'' ' =======================================================
'' Try
'' 'ds.Tables(tblIndex).Rows(rwIndex).Item(0) = astep
'' Catch
'' ' ignore the error corrected integer identity so don't randomize it
'' End Try
'' dr.Item("createdDate") = Now
'' dr.Item("changedDate") = Now
'' Case DataRowState.Modified
'' dr.Item("changedDate") = Now
'' End Select
'' Catch ex As Exception
'' conn.Close()
'' conn.Dispose()
'' Throw New ArgumentException(" Error: update_datasets " & ex.Message)
'' End Try
'' rwIndex += 1
''Next
selectstmt = "SELECT * From " & dt.TableName & " Where " & dt.Columns(0).ColumnName & " = " & 0
da = New OracleDataAdapter(selectstmt, m_conn)
Dim bldr As OracleCommandBuilder = New OracleCommandBuilder(da)
AddHandler da.RowUpdated, New Oracle.DataAccess.Client.OracleRowUpdatedEventHandler(AddressOf da_RowUpdated)
Dim insCmd As OracleCommand = Nothing
Try
insCmd = CType(bldr.GetInsertCommand(), OracleCommand)
Catch ex As Exception
Throw New Exception("")
End Try
insCmd.CommandText += " returning " + dt.Columns(0).ColumnName + " into :seqno"
insCmd.Parameters.Add(New OracleParameter("seqno", OracleDbType.Int16, _
4, ParameterDirection.Output, False, CType(0, System.Byte), CType(0, _
System.Byte), dt.Columns(0).ColumnName, DataRowVersion.Current, Nothing))
da.InsertCommand = insCmd
Try
' ===========================
da.Update(ds, dt.TableName)
' ===========================
Catch ex As Exception
Throw New ArgumentException(" Error: update_datasets_return " & ex.Message)
End Try
Next
m_conn.Close()
m_conn.Dispose()
Return ds
End Function
Friend Shared Sub da_RowUpdated(ByVal sender As Object, ByVal e As OracleRowUpdatedEventArgs)
If e.StatementType = StatementType.Insert Then
e.Row(0) = Int64.Parse(e.Command.Parameters("seqno").Value.ToString())
End If
End Sub
' ================================================================================
' Notes:
' =================== How To -- Sample section for PL/SQL ==================================
' myTrigger, myTable, mySequence, and myColumn are values you need to supply.
' Note: A trigger needs to be created for each table.
' A sequence needs to be created only once and referenced each time
' in the trigger(s). Or you could create a new sequence each time you
' create a trigger. Sort of a waste of effort.
' Explanation:
' myTrigger = The name you are giving this trigger.
' If a trigger with same name already
' exist, it will be overwritten.
' myTable = Table you want to add the sequence numbers to.
' mySequence = Sequence counter you created. Whatever name you called it.
' myColumn = The column to update with the sequence number.
' =================================================================================
' -- Run in PL/SQL or create at DB. --
' create or replace trigger myTrigger
' before insert on myTable for each row
' begin
' select mySequence.nextval into :new.myColumn from dual ;
' end;
' -- Run in PL/SQL or create at DB. --
' create sequence mySequence
' MINVALUE 1
' START WITH 1
' INCREMENT BY 1
' NOCACHE; can be set to CACHE but sequence may contain gaps.
' Explanation of CACHE from: http://www.techonthenet.com/oracle/sequences.php
' With respect to a sequence, the CACHE option specifies how many sequence
' values will be stored in memory for faster access. The downside of creating
' a sequence with a CACHE is that if a system failure occurs, all cached
' sequence values that have not be used, will be "lost". This results in
' a "gap" in the assigned sequence values. When the system comes back up,
' Oracle will CACHE new numbers from where it left off in the sequence,
' ignoring the so called "lost" sequence values.
' Note: To recover the lost sequence values, you can always execute an
' ALTER SEQUENCE command to reset the counter to the correct value.
' NOCACHE means that none of the sequence values are stored in memory.
' This option may sacrifice some performance, however, you should not encounter
' a gap in the assigned sequence values.
End Class
C#:
using System;
using System.Data;
using Oracle.DataAccess.Client;
using Oracle.DataAccess.Types;
public class OracleUpdater2
private static OracleConnection m_conn;
private static OracleDataAdapter da = new OracleDataAdapter();
private static OracleConnection conn = new OracleConnection();
public static DataTable load_it(string constr, string strqry, string tblName)
// =====================================================================
// constr = User Id=myUser;Password=myPass";Data Source=myDataSource
// strqry = Select * from something?
// tblName = The table name to fill.
// =====================================================================
conn = new OracleConnection(constr);
conn.Open();
da = new OracleDataAdapter(strqry, conn);
OracleCommandBuilder bldr = new OracleCommandBuilder(da);
DataTable dt = new DataTable(tblName);
da.Fill(dt);
conn.Dispose();
return dt;
public static DataSet update_datasets_return(string constr, DataSet ds)
//'ByRef ds As DataSet)
string selectstmt = null;
m_conn = new OracleConnection(constr);
try
m_conn.Open();
catch (Exception ex)
throw new ArgumentException(" Error: connection lost." + ex.Message);
foreach (DataTable dt in ds.Tables)
selectstmt = "SELECT * From " + dt.TableName + " Where " +
dt.Columns[0].ColumnName + " = " + 0;
da = new OracleDataAdapter(selectstmt, m_conn);
OracleCommandBuilder bldr = new OracleCommandBuilder(da);
da.RowUpdated += new
Oracle.DataAccess.Client.OracleRowUpdatedEventHandler(da_RowUpdated);
OracleCommand insCmd = null;
try
insCmd = (OracleCommand)(bldr.GetInsertCommand());
catch (Exception ex)
throw new Exception("" + ex.Message);
insCmd.CommandText += " returning " + dt.Columns[0].ColumnName + " into
:seqno";
insCmd.Parameters.Add(new OracleParameter("seqno", OracleDbType.Int16, 4,
ParameterDirection.Output, false, System.Convert.ToByte(0),
System.Convert.ToByte(0), dt.Columns[0].ColumnName, DataRowVersion.Current,
null));
da.InsertCommand = insCmd;
try
// ===========================
da.Update(ds, dt.TableName);
// ===========================
catch (Exception ex)
throw new ArgumentException(" Error: update_datasets_return " +
ex.Message);
m_conn.Close();
m_conn.Dispose();
return ds;
If you need a working program of how this works, let me know.

Oh my god, it is too long! You definitely check out types, casting and especially ODP.Net (it does everything for you)... etc. They can help you to simplify your code. I do not have enough time to copy paste it to Studio and understand and solve your issue, so I got title of your message as your main question.
In Oracle, you can create an autonumber field by using sequences object. This is really useful when you need to create a unique number to act as a primary key.
Basically you can create a sequence simply typing;
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now you have a sequence called "MY_SEQUENCE"... Then, I advice you select a number from sequence;
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I said I advice actually kinda must, although it called sequence, I cannot be sequential. Do not even try to predict the value. You can be sure that it is unique number so you can use it.
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FYI,
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How to Auto generate "order_id"

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