anyone can help me with this. I created a trigger in firebird. I have this line that uses concatenation.
NEW.FIELDNAME = FIELD1 || FIELD2;
but it is not working, no record has been inserted. Is there any way for string concatenation? THANKS IN ADVANCE!
here is my full trigger
*query that initiate the variable PREV_STATUS:
SELECT FIRST 1 PREV_STATUSPERMINS FROM C3_EQUIPTSTATEPERMIN
WHERE TESTERID = NEW.TESTERID ORDER BY DATEMODIFIED DESC INTO :PREV_STATUS;
IF(PREV_STATUS IS NULL) THEN
BEGIN
NEW.PREV_STATUSPERMINS = '000';
END
ELSE
BEGIN
NEW.PREV_STATUSPERMINS = PREV_STATUS || NEW.STATUS;
END
You should use the "new" keyword to access the values of your fields within a trigger :
new.fieldname = new.field1 || new.field2;
Also, don't forget that if either of the fields is null, the concatenation will be null. If you want to avoid that, you could do something like this :
NEW.FIELDNAME = coalesce(new.FIELD1, '') || coalesce(new.FIELD2, '')
Related
SELECT CASE (SELECT Count(1)
FROM wf_item_activity_statuses_v t
WHERE t.activity_label IN ('WAITING_DISB_REQ',
'LOG_DDE',
'LOG_SENDBACK_DDE')
AND t.item_key IN(
SELECT r.i_item_key
FROM wf_t_item_xref r
WHERE r.sz_appl_uniqueid = '20400000988')
)
WHEN 0 THEN
(
delete
from t_col_val_document_uploaded p
WHERE p.sz_application_no = '20400000988'
AND p.sz_collateral_id = 'PROP000000000PRO1701'
AND p.i_item_key = '648197'
AND p.i_document_srno = '27' )
WHEN 1 THEN
(
DELETE
FROM t_col_val_document_uploaded p
WHERE p.sz_application_no = '20400000988'
AND p.sz_collateral_id = 'PROP000000000PRO1701'
AND p.i_document_srno = '28' )
ELSE NULL
END
FROM dual;
You need to recreate your query and make sure to follow the flow of the clauses properly, please check the next two links to get a better understanding :
[ORA-00936: missing expression tips]
How do I address this ORA-00936 error?
Answer: The Oracle oerr utility notes this about the ORA-00936 error:
ORA-00936 missing expression
Cause: A required part of a clause or expression has been omitted. For example, a SELECT statement may have been entered without a list of columns or expressions or with an incomplete expression. This message is also issued in cases where a reserved word is misused, as in SELECT TABLE.
Action: Check the statement syntax and specify the missing component.
The ORA-00936 happens most frequently:
1 - When you forget list of the column names in your SELECT statement.
2. When you omit the FROM clause of the SQL statement.
ora-00936-missing-expression
I hope this can help you.
You cannot use a simple select query like this. You have to use a PL/SQL block like below -
DECLARE NUM_CNT NUMBER := 0;
BEGIN
SELECT Count(1)
INTO NUM_CNT
FROM wf_item_activity_statuses_v t
WHERE t.activity_label IN ('WAITING_DISB_REQ',
'LOG_DDE',
'LOG_SENDBACK_DDE')
AND t.item_key IN(SELECT r.i_item_key
FROM wf_t_item_xref r
WHERE r.sz_appl_uniqueid = '20400000988');
IF NUM_CNT = 0 THEN
delete
from t_col_val_document_uploaded p
WHERE p.sz_application_no = '20400000988'
AND p.sz_collateral_id = 'PROP000000000PRO1701'
AND p.i_item_key = '648197'
AND p.i_document_srno = '27';
ELSIF NUM_CNT = 1 THEN
DELETE
FROM t_col_val_document_uploaded p
WHERE p.sz_application_no = '20400000988'
AND p.sz_collateral_id = 'PROP000000000PRO1701'
AND p.i_document_srno = '28' )
END IF;
END;
I am using following script to generate objects in C# from Oracle and it works ok.
select 'yield return new Question { QuestionID = '||Q.questionid||', Qcode = "'||Q.Qcode||'", QuestionDescription = "'||Q.questiondescription||'", QuestionText = "'||Q.questiontext||'", QuestionCategoryId = '||Q.questioncategoryid||', QuestionTypeID = '||Q.QuestionTypeID||', IsThunderheadOnly = '|| case q.isthunderheadonly when 0 then 'false' else 'true' end ||', DisplayOrder = '||q.displayorder||' };'
from QUESTION q
where
questioncategoryid = 7
However again and again I run into the problem where I cannot || add columns with NULL values and solution to this point was adding those properties manually, which was ok when selecting up to 20 records.
Now I ran into a case of having to select hundreds of records and adding them manually would take substantial amount of time.
How could I modify the script to add (example) MaxValue property if column in the table is NOT NULL but skip it it if it is?
You can skip it with case ... when ... else like you figured out by yourself:
... ||case when A.NEXTQUESTIONID is not null then 'NextQuestionID = '||A.NEXTQUESTIONID||',' else '' end || ...
You can also use the nvl2 function for a shorter solution:
... || nvl2(A.NEXTQUESTIONID, 'NextQuestionID = '||A.NEXTQUESTIONID||',', '') || ...
I have some dynamic SQL code, here's a sampple:
v_RUNNING_QUERY VARCHAR2(1000);
BEGIN
v_RUNNING_QUERY := 'SELECT PBA.PTY_ID FROM PARTY.PARTY_BILLING_ACCOUNT PBA
WHERE PBA.BILLING_ACCT_SRC_ID1 = p_BILLING_ACCT_SRC_SYS
AND
PBA.BILLING_ACCT_SRC_SYS_CD = p_PBA.BILLING_ACCT_SRC_SYS_CD;
IF p_BILLING_ACCT_SRC_SYS_ID2 IS NOT NULL
THEN
v_RUNNING_QUERY := v_RUNNING_QUERY || ' AND PBA.BILLING_ACCT_SRC_ID2 = p_BILLING_ACCT_SRC_SYS_ID2';
The issue is that my boss wants me to remove all Dynamic SQL. In place of that, I need to mainly use IF-logic. But he also said that I can use COALESCE . I'm lost ... How does COALESCE help with this ?
You could get the same logic as:
SELECT PBA.PTY_ID
FROM PARTY.PARTY_BILLING_ACCOUNT PBA
WHERE PBA.BILLING_ACCT_SRC_ID1 = p_BILLING_ACCT_SRC_SYS AND
PBA.BILLING_ACCT_SRC_SYS_CD = p_BILLING_ACCT_SRC_SYS_CD AND
(p_BILLING_ACCT_SRC_SYS_ID2 IS NULL OR PBA.BILLING_ACCT_SRC_ID2 = p_BILLING_ACCT_SRC_SYS_ID2)
It does seem that you want some comparison after BILLING_ACCT_SRC_ID2.
EDIT:
You could also phrase this as:
SELECT PBA.PTY_ID
FROM PARTY.PARTY_BILLING_ACCOUNT PBA
WHERE PBA.BILLING_ACCT_SRC_ID1 = p_BILLING_ACCT_SRC_SYS AND
PBA.BILLING_ACCT_SRC_SYS_CD = p_BILLING_ACCT_SRC_SYS_CD AND
PBA.BILLING_ACCT_SRC_ID2 = coalesce(p_BILLING_ACCT_SRC_SYS_ID2, PBA.BILLING_ACCT_SRC_ID2);
This uses coalesce() but the logic doesn't need it.
I have in my hands an old app on informix server and I'm migrating data into a different database. Both are informix databases. I have a particular problem with one table. Old app used it to support multiline text.
OldTable:
HeaderID int
LineNum int
Descr nvarchar(50,1)
NewTable:
HeaderID int
Descr lvarchar(max)
So, for each HeaderID I have to read the descriptions ordered by line number and put them all together for insert into a new table. There has to be a newline character between each line for conversion to succeed.
Any tips on how to do this?
If you need to do it from SQL then you can use procedure:
CREATE FUNCTION get_text(aHeaderID int)
RETURNING lvarchar;
DEFINE result lvarchar;
DEFINE vcfld lvarchar;
LET result=NULL;
EXECUTE PROCEDURE IFX_ALLOW_NEWLINE('T');
FOREACH cur1
FOR SELECT Descr INTO vcfld FROM OldTable WHERE HeaderID = aHeaderID ORDER BY LineNum
IF result IS NULL THEN
LET result = vcfld;
ELSE
LET result = result || '
' || vcfld;
END IF;
END FOREACH;
RETURN result;
END FUNCTION;
(notice usage of IFX_ALLOW_NEWLINE and line breaking when updating result)
Then you can fill NewTable using:
UPDATE NewTable SET Descr=get_text(HeaderID);
You can use PreparedStatement. This is example in Jython that uses JDBC Informix driver:
db = DriverManager.getConnection(db_url, usr, passwd)
pstm = db.prepareStatement("SELECT vc FROM src ORDER BY id")
rs = pstm.executeQuery()
lines = []
while (rs.next()):
lines.append(rs.getString(1))
pstm = db.prepareStatement("INSERT INTO dest (lvc) VALUES (?)")
pstm.setString(1, '\n'.join(lines))
rs = pstm.execute()
db.close()
So what I need is to append a string in a column on a firebird database everytime I run the update, I'm trying:
update clients set cliobs = coalesce(cliobs, '') || 'newstring' where cod = 1
I get the 1 record(s) was(were) updated but the end result is:
coalesce(cliobs, ') || newstring
Any ideas how to do this?