I am using sql.firstRow to check if a row exists in the postgres database based on some criteria.
def cur = sql.firstRow(r, '''
SELECT "some_thing"
FROM "my_table"
WHERE "customer_name" = :customer_name
AND "sad_date" = :sad_date
AND "forgiver" = :forgiver
''')
I find that this works:
if (cur){
log.debug("Found Some thing " + cur["some_thing"])
log.debug("Cur: " + cur.keySet())
}
however this lets in any rows that don't have some_field inside it.
ISSUE
To avoid this, when we try and check for the existance of a non empty value for some_field on the result row like this:
if (cur && "${cur.some_thing}" ){
log.debug("Found Some thing " + cur["some_thing"])
}
ERROR
I get an error suggesting that:
No signature of `String.positive` for argument types for the given type.
I have read this question and changed from cur.some_thing and cur['some_thing'] to "${cur.some_thing}" but the error does not go away
I have also tried this post and tried to use cur.getProperty("some_thing") and it still throws the same error.
Related
Althogh I've been supporting (and extending) a legacy OE application for 10 years plus, I've never before been forced into the scary world of dynamic buffers... However, my luck has finally run out.
Let me start by saying I cannot believe how opaque the little OE documentation I could find is... the only Progress guide seems to be in the online documentation for v10.2 (thanks to the contributer to one of the forums for even that snippet.)
Anyway, this should be almost trivial. Except that it doesn't work;
DEFINE VARIABLE hFileBuffer AS WIDGET-HANDLE.
DEFINE VARIABLE hFieldBuffer AS WIDGET-HANDLE.
DEFINE VARIABLE cWhere AS CHARACTER.
DEFINE VARIABLE hQuery AS HANDLE.
CREATE BUFFER hFileBuffer FOR TABLE "_File".
CREATE BUFFER hFieldBuffer FOR TABLE "_Field".
CREATE QUERY hQuery.
hQuery:SET-BUFFERS(hFileBuffer).
hQuery:ADD-BUFFER(hFieldBuffer).
cWhere = SUBSTITUTE(
"FOR EACH _File " +
" NO-LOCK, " +
" EACH _Field " +
" WHERE _Field.File-recid = _File._File-recid " +
" NO-LOCK"
).
message cWhere.
pause.
hQuery:Query-PREPARE(cWhere).
hQuery:Query-OPEN().
DELETE OBJECT hQuery.
DELETE OBJECT hFileBuffer.
DELETE OBJECT hFieldBuffer.
ASSIGN hQuery = ?
hFileBuffer = ?
hFieldBuffer = ?.
The output from "message" is (after removing redundant spaces):
FOR EACH _File NO-LOCK, EACH _Field WHERE _Field.File-recid = _File._File-recid NO-LOCK
which looks fine to me.
However I then get:
_Field File-recid must be a quoted constant or an unabbreviated, unambiguous buffer/field reference for buffers known to query . (7328)
I just cannot see what is ambiguous about "_Field.File-recid" or "_File._File-recid". Or am I missing something? (I should add that the equivalent works in good ol'-fashioned static OpenEdge!)
Hoping someone wiser than I can advise,
Allan.
There are two issues in your dynamic query string:
a) It's RECID(_file) and not _file._file-recid (no _file-recid field on _file)
b) It's _field._file-recid and not _field.file-recid (underscore missing)
cWhere = SUBSTITUTE(
"FOR EACH _File " +
" NO-LOCK, " +
" EACH _Field " +
" WHERE _Field._File-recid = recid(_file)" +
" NO-LOCK"
).
You can enable the display of hidden fields in the Data Dictionary:
Just an example on ABL Dojo to watch your query fly:
def var hbfile as handle no-undo.
def var hbfield as handle no-undo.
def var hq as handle no-undo.
def var cquery as char no-undo.
create buffer hbfile for table '_file'.
create buffer hbfield for table '_field'.
create query hq.
hq:set-buffers( hbfile, hbfield ).
cquery = substitute(
'for each &1 where &1._hidden = false'
+ ', each &2 where &2._file-recid = recid( &1 )'
+ ' break by &1._file-name',
hbfile:name,
hbfield:name
).
hq:query-prepare( cquery ).
hq:query-open().
do while hq:get-next():
if hq:first-of( 1 ) then
message hbfile::_file-name.
message ' ' hbfield::_field-name.
end.
finally:
delete object hq no-error.
delete object hbfile no-error.
delete object hbfield no-error.
end finally.
A few additional issues with your snippet:
buffer handles are regular handles, no need for the meaningless widget- prefix
when working with dynamic buffers, it really helps to use the :name of the dynamic buffer, this allows you to change names without causing the query to fail
Am I missing an error with the following to insert into a table with four columns, message_id (auto-incremented) message_sender, message_reciever, message_body. I have checked similar questions and haven't found the solution.
'''
<% String sender_id = request.getParameter("message_sender");
String reciever_id = request.getParameter("message_reciever");
String message = request.getParameter("message_body");
try{
Class.forName("com.mysql.jdbc.Driver");
Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/fyp", "root", "Kmd116352323!");
Statement st = con.createStatement();
st.executeUpdate("INSERT INTO messages(message_sender,message_reciever,message_body) VALUES('"+sender_id+", "+reciever_id+" , "+message+" ')");
out.println("Your request has been noted."
+ " Please return to your user profile or log out");
} catch(Exception e){
out.println(e);
}
%>
You should not concatenate values into a query string. It makes your code vulnerable to SQL injection, or mistakes like forgetting quotes around values. The specific problem in your case is that you have a quote before the first value and a quote after the last value, which makes it a single value instead of three separate values.
However, instead of fixing the immediate problem by adding those missing quotes, you should switch to using a prepared statement:
try (PreparedStatement pstmt = connection.prepareStatement(
"INSERT INTO messages(message_sender,message_reciever,message_body) VALUES(?, ?, ?)") {
pstmt.setString(1, sender_id);
pstmt.setString(2, reciever_id);
pstmt.setString(3, message);
pstmt.executeUpdate();
}
As an aside, you really should not put data access in a JSP. It belongs in a DAO or service class.
This is incorrect:
VALUES('"+sender_id+", "+reciever_id+" , "+message+" ')
You have a ' wrapping the all the values... Which means sql will think you are only sending 1 value. If they are all text values it should be like this:
VALUES('"+sender_id+"', '"+reciever_id+"' , '"+message+"')
If you know some of the values are of INT type then you do not need the ' for that value:
VALUES("+sender_id+", "+reciever_id+" , '"+message+"')
Text values need to be wrapped with a '
I'm trying to write function for selecting optional columns in linq(columns that may not exist). The problem is in linq like this:
using (DataDataContext db = new DataDataContext()){
var collection = from t in table
select new
{
Nonoptional = t.A;
Optional = IsInDB("table","B") ? t.B : -1; //this is optional column
}}
Unfortunately, this won't work because the fragment near Optional will be translated to case statement and error arises that column not exists.
So i decided to "cover" it with function:
using (DataDataContext db = new DataDataContext()){
var collection = from t in table
select new
{
Nonoptional = t.A;
Optional = IsInDB("table","B") ? OptionalColumnValue<int>("table","B","id_table",t.id_table) : -1; //this is optional column
}}
I want this function to be universal. It should work like that" If there is no value or column is nullable and value is null then return default value for type.
I came up with something like this:
//table,column - obvious,id_column - PK column of table, id - id of currently processing record
public static T OptionalColumnValue<T>(string table,string column,string id_columm,int id) T t = default(T);
DataDataContext db = new DataDataContext();
IEnumerable<object> value = db.ExecuteQuery<object>("select " + column + " from " + table + " where " + id_columm + " = " + id.ToString());
List<object> valueList = value.ToList();
if (valueList.Count == 1)//here is the problem
t = (T)valueList.First();
return t;
}
When there is null value db.ExecuteQuery return something like object{}. I'm assuming this is "empty" object,with nothing really in there. I was thinking about checking for "emptiness" of this object( BTW this is not DBull).
When i realised that this is no way either with concrete value in this column(it cannot cast it to return correct type), then I tried db.ExecuteQuery<T>. Then concrete value - OK, null - Exception.
I thought, maybe Nullable<T> as return value. Nop, because string also can be T.
I don't know what to do next. Maybe there's another solution to this problem.
I have this table:
Please, don't mind because it's on my native language and it doesn't matter..
Those are all attributes in table but when I go to Visual StudioS and try to use some of this I get this one:
I see all "normal" attributes in VS but where is those FK attributes?
I need them to compare few ones and get values?
I can't use it from name of other tables [dot] attribute etc...
like for example:
I need this: table1.ID == table2.ID
and not this: table1.ID == table1.table2.ID
Where or what is FK attribute in VS that is shown in SQL table ??
public void setParametri(int desID)
{
foreach (desavanje d in DM_Class.dc.desavanje)
if (d.desavanjeID == desID)
{
//THIS FIRST 4 LINES WORKS PERFECTLY
this.naziv_des = d.naziv_des;
this.datum_po = d.datum_pocetka.ToString();
this.datum_zav = d.datum_kraja.ToString();
this.cijena = d.cijena_des;
//foreach (klijenti k in DM_Class.dc.klijenti)
//{
// if(k.klijentID == //WHAT TO PUT HERE TO COMPARE VALUE klijentID from tables klijenti with FK value in table desavanje)
// this.klijent = k.Ime + ' ' + k.Prezime;
//}
//ON THIS LINE I'M GETTING ERROR - Object reference not set to an instance of an object. but why?
//I have data on that field in DB ?
//this.grad = d.mjesto_desavanja.gradovi.naziv_grada.ToString();
//this.mjesto = d.mjesto_desavanja.naziv_objekta;
//this.organizator = d.organizator.Ime + ' ' + d.organizator.Prezime;
//this.tip = d.tip_desavanja.vrsta_des;
this.klijent = d.klijenti.Ime + ' ' + d.klijenti.Prezime;
//this.status = d.status_desavanja.naziv_statusa;
//this.br_gost = d.specifikacija_desavanja.br_osoba;
}
}
If is there other solution to get values for attributes I'm willing to try it without using another foreach loop?
Ok, I managed this.. I've used a linq query to generate data that I need and in that queries I've compared needed ID's and finally get some working stuff.
I've looked around everywhere, but I can't seem to find exactly what I'm trying to do. It should be fairly simple...
I have a db table set up like this:
var db = Ti.Database.open('playerInfo.db');
db.execute('CREATE TABLE IF NOT EXISTS playersTable (id INTEGER PRIMARY KEY, name TEXT NOT NULL, "50" INTEGER, "25" INTEGER )');
I have two buttons with an assigned value of 25, and 50, respectively. Each button has a "value" key, where I assign their values. I am trying to accomplish three things:
When a button is pressed, find the column of corresponding value.
increase the value of this column by 1.
Retrieve the new value and console log it.
This is what my code looks like when a button is pressed:
var rows = db.execute("SELECT '" + button.value + "' FROM playersTable WHERE name= '" + owner + "'");
var imagesString = rows.fieldByName(button.value);
Ti.API.debug(imagesString)
This is all in a click event listener where the variable "owner" is passed in as a string.
This is the error I get:
message = "Attempted to access unknown result column 25";
I don't have too much experience with sql, so I'm not sure what I'm doing right and what I'm doing wrong. Any help is appreciated!
Thanks.
I'm not sure quite exactly what the problem is, but the following works for me. Note that the "?" variable substitution syntax makes sure that the values are quoted properly for MySQL:
button = e.source;
db = Titanium.Database.open('test');
var rows = db.execute("SELECT * FROM playersTable WHERE name= ?", "foo");
// Theoretically this should be returning a single row. For other results,
// we would loop through the result set using result.next, but here just check if
// we got a valid row.
if (rows.isValidRow()) {
var imagesString = rows.fieldByName(button.value);
var id = rows.fieldByName('id');
imagesString = imagesString + 1;
Ti.API.info("id = " + id + " val = " + imagesString);
// The ? substitution syntax doesn't work for column names, so we
// still need to stick the button value into the query string.
db.execute('UPDATE playersTable set "' + button.value +'"= ? where id = ?', imagesString, id);
}
else
{
Ti.API.info("Row not found.");
}
db.close();
If you get the row not found error, it's possible your data isn't getting inserted properly in the first place. Here's how I inserted my test row for player "foo":
db.execute('insert into playersTable (name, "50", "25") values (?,?,?)', 'foo', 0, 0);
I think this should solve your problem. Let me know if this doesn't work for you.