SELECT, update, SELECT the problem

Hello world

I am very new to working with Oracle with .net and I am a bit confused by something, so I hope someone can help me...
The situation is that I have 3 commands. The first selects a row in a table ("SELECT field1, Field2 FROM table1 WHERE Field1 is 1'), then Field2 = 'foo '. The second command updates the same line in this table ('UPDATE table1 SET Field2 = 'bar' WHERE field1 = 1'), then the third makes a selection re (('SELECT champ1, champ2 FROM table1 WHERE champ1 = 1').) The problem I have is that the third command bring me the same results that firstly, unchanged - even if I see this line in the database and I KNOW He is changed, and the second command worked. Field2 = always "foo"... If I refresh and refresh a couple of times, data is changed later.

Here is a code...

DataTable Table = new DataTable();
OracleConnection conn = new OracleConnection ("User Id = database; Password = password; Data Source =');
Conn. Open();
OracleDataAdapter adapter = new OracleDataAdapter ("SELECT field1, Field2 FROM TABLE1 WHERE FIELD1 = 1, conn);
Set DataSet = new DataSet();
adapter. Fill (Set);
Table = all. Tables [0];

It's all right, I get what I expect, IE: Field2 = 'FOO '...
So now, I am doing this...

OracleParameter Field2Param = new OracleParameter ("Field2", OracleDbType.Char, 64, "BAR", ParameterDirection.Input);

OracleConnection conn = new OracleConnection ("User Id = database; Password = password; Data Source =');
Conn. Open();

OracleCommand cmd = new OracleCommand (insertstr, conn);

OracleTransaction txn is conn. BeginTransaction (IsolationLevel.ReadCommitted);

cmd. Parameters.Add (Field2Param);

cmd ExecuteNonQuery());

.. .This works also, depending on the point of view of database.

So I update in the same way as before...

DataTable Table = new DataTable();
OracleConnection conn = new OracleConnection ("User Id = database; Password = password; Data Source =');
Conn. Open();
OracleDataAdapter adapter = new OracleDataAdapter ("SELECT field1, Field2 FROM TABLE1 WHERE FIELD1 = 1, conn);
Set DataSet = new DataSet();
adapter. Fill (Set);
Table = all. Tables [0];

.. .but I still get Field2 as 'FOO '...

Help, please...

Hello

Complete code would help here, because I can't tell where you are finishing the explicit transaction and data validation. Can you reproduce the complaint if you all back to back sequentially in a console application standalone with all the code inside the HAND, for example?

Here is my proposal, if: call you con. Open several times, so the second or 3rd con. Open call receives a different connection of the pool, rather than you use only and did not commit the transaction again so that it is visible to other connections.

Also, if your db is RAC, it is also delay spread of validation that can prevent the data to be visible in the other nodes, if your code is running in a tight loop and you are connected to another node.

It will be useful,
Greg

Published by: gdarling on June 27, 2011 11:25

Tags: Database

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They all install properly but switches back to windows update to install. It's some kind of loop.

Hi billy73,

In addition, if you still have questions, please take a look at the thread similar here with a solution as possible.

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Select the problem with expressions

Hello

I use Teststand 4.0 and a frustrating problem with the Select Case statements.

I have attached a sequence that shows the problem.

A loop from 0 to 10.

The select case statement should decide which box 3 instructions corresponds to the expression and a message box is displayed.

However the Basic program reacts as expected.

First, he made his entry with a value of 0, it goes to the > 7 stated case.

The second time, he enters the loop with a value of 1, it will correctly to the<3 case="">

The other values of 2 to 10 enter no case statement.

Is this a bug in TS 4?, or I do something wrong?

Thank you

Mike

The problem is that you compare the Locals.New_Val of the Locals.New_Val property.< 3". ="" if="" those="" two="" properties="" match,="" then="" it="" will="" execute. ="" if="" you="" wanted="" that="" particular="" case="" to="" execute="" when="" locals.new_val="" is="" 0,="" you="" would="" just="" type="">

Unfortunately there is no way to have multiple cases of a single block of code.

In C, you could do it like this:

Switch (newVal)

{

case 0:

case 1:

case 2:

do something

break;

case 3:

case 4:

case 5:

case 6:

case 7:

do something else

break;

etc...

}

Even in C, it's awkward, and you would probably do the following instead:

If (newval<>

do something

Else if (newval<>

do something else

on the other

do something else

The reason why it works in TestStand, is that expressions will try to automatically convert types if she can do it. false is logically equivalent to 0 and true, it is logically equivalent to 1, so what you are really comparing to in your case statement is your property (Locals.New_Val) to a Boolean expression that evaluates to 0 or 1. It is certainly not obvious when we look at, but at least, this explains why it happens. Another way, you could do this is to change "Point to compare" step of the 'True' selection, which will each case in order to compare the expression of the value 'true '. I still recommend a structure if/else if/else for this kind of problem because it's easier to read, but it is possible to do what you want in this case with a select / box.

P. Allen

NEITHER

Select the problem with joined tables

Hello everyone I have the following query

SELECT 
    OBJEKTI.OBJEKAT_ID OBJEKAT_ID, 
    OBJEKTI.ADRESA ADRESA, 
    OBJEKTI.POVRSINA POVRSINA, 
    OBJEKTI.BROJ_IZVRSILACA BROJ_IZVRSILACA, 
    OPREMLJENOSTI.OPREMLJENOST_ID OPREMLJENOST_ID, 
    OPREMLJENOSTI.PULT PULT, 
    OPREMLJENOSTI.REKLAMA REKLAMA, 
    OPREMLJENOSTI.MOKRI_CVOR MOKRI_CVOR, 
    OPREMLJENOSTI.WC_ZA_IGRACE WC_ZA_IGRACE, 
    OPREMLJENOSTI.WC_ZA_OSOBLJE WC_ZA_OSOBLJE, 
    OPREMLJENOSTI.VENTILATOR VENTILATOR, 
    OPREMLJENOSTI.OSVJETLJENJE OSVJETLJENJE, 
    OPREMLJENOSTI.VRSTA_BROJILA VRSTA_BROJILA, 
    OPREMLJENOSTI.ELEKTRO_INSTALACIJE ELEKTRO_INSTALACIJE, 
    OPREMLJENOSTI.VODO_INSTALACIJE VODO_INSTALACIJE, 
    OPREMLJENOSTI.TELEFONSKE_INSTALACIJE TELEFONSKE_INSTALACIJE, 
    OPREMLJENOSTI.GRIJANJE_ID GRIJANJE_ID, 
    OPREMLJENOSTI.POD_ID POD_ID, 
    OPREMLJENOSTI.PROZORI_VRATA_ID PROZORI_VRATA_ID, 
    OPREMLJENOSTI.OBJEKAT_ID OBJEKAT_ID1, 
    TEHNICKE_OPREMLJENOSTI.TEH_OPR_ID TEH_OPR_ID, 
    TEHNICKE_OPREMLJENOSTI.ONLINE_KLADIONICA ONLINE_KLADIONICA, 
    TEHNICKE_OPREMLJENOSTI.PANO PANO, 
    TEHNICKE_OPREMLJENOSTI.NOSACI NOSACI, 
    TEHNICKE_OPREMLJENOSTI.TV_LCD TV_LCD, 
    TEHNICKE_OPREMLJENOSTI.TV_TELETEXT TV_TELETEXT, 
    TEHNICKE_OPREMLJENOSTI.APARATI_IGRE APARATI_IGRE, 
    TEHNICKE_OPREMLJENOSTI.EVONA EVONA, 
    TEHNICKE_OPREMLJENOSTI.NOVOMATIC NOVOMATIC, 
    TEHNICKE_OPREMLJENOSTI.RULET RULET, 
    TEHNICKE_OPREMLJENOSTI.BILIJAR BILIJAR, 
    TEHNICKE_OPREMLJENOSTI.KLIMA KLIMA, 
    TEHNICKE_OPREMLJENOSTI.OBJEKAT_ID OBJEKAT_ID2, 
    PONUDE.PONUDA_ID PONUDA_ID, 
    PONUDE.ONLINE_TERMINAL ONLINE_TERMINAL, 
    PONUDE.SRECKE SRECKE, 
    PONUDE.ONLINE_KLADIONICA ONLINE_KLADIONICA1, 
    PONUDE.APARATI_IGRE APARATI_IGRE1, 
    PONUDE.RULET RULET1, 
    PONUDE.BILIJAR BILIJAR1, 
    PONUDE.OBJEKAT_ID OBJEKAT_ID3 
FROM 
    OBJEKTI, 
    OPREMLJENOSTI, 
    TEHNICKE_OPREMLJENOSTI, 
    PONUDE 
WHERE 
(PONUDE.OBJEKAT_ID=OBJEKTI.OBJEKAT_ID AND TEHNICKE_OPREMLJENOSTI.OBJEKAT_ID=OPREMLJENOSTI.OBJEKAT_ID) OR (OPREMLJENOSTI.OBJEKAT_ID=OBJEKTI.OBJEKAT_ID AND TEHNICKE_OPREMLJENOSTI.OBJEKAT_ID=OPREMLJENOSTI.OBJEKAT_ID)
 ORDER BY OBJEKTI.OBJEKAT_ID

The problem I have is any WHERE clause I use I have double values that makes no sense. I checked in the tables and I not all double values. Each Opremljenost has 1 objekat (there are 2 rows of each with its own Objekat) and this applies to 2 other tables (PONUDE and TEHNICKE OPREMLJENOSTI), but for some reason any that they double values. If I run it without a where clause at all clause, I get a repetition of values itself up to 4 times. Does anyone have an idea what's wrong with my request?

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where OBJ.object = OPR.object (+)
  and OBJ.object = TEH.object (+)
  and OBJ.object = PON.object (+)
/

its supposed to be a 1 to 1 relationship, but it is not.

In this case the remedy is very simple: create a UNIQUE constraint on the column of the OBJECT in OPR, TEH and PON...

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Select the problem posed by the query?
Hello

I use 10g and here is my example query adds nothing. I know there are records in the database. It must be linked with my date conversions.

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Furthermore, draw_tm is a column DATE (05/11/2013 03:59:59) and the DT is also a column DATE (10/05/2013)
raysefo wrote:
Hello

I use 10g and here is my example query adds nothing. I know there are records in the database. It must be linked with my date conversions.

SELECT a.gm_cd, a.draw_cd, NVL (b.cpns, 0) cpns, NVL (b.clms, 0) SSAC, NVL (b.amn, 0) amn FROM (SELECT gm_cd, draw_cd, TO_DATE (draw_tm, ' DD/MM/YYYY') draw_tm TO draw WHERE gm_cd = 10105 AND TO_DATE (draw_tm, ' DD/MM/YYYY') = TO_DATE (sysdate-1, ' DD/MM/YYYY')) a, (SELECT SUM (DECODE (a.from_draw, a.to_draw, a.cpns * b.sing_ind 0)) cpns) (, SNSOT SUM (a.clms* b.sing_ind), amn SUM (a.amn* b.sing_ind) OF draw_sales a, ACC_TYPE b WHERE a.tp = b.cd AND a.DT = TO_DATE(sysdate-1, 'DD/MM/YYYY') AND a.gm_cd = 10105) b ORDER BY a.gm_cd, a.draw_cd

Any ideas?

Furthermore, draw_tm is a column DATE (05/11/2013 03:59:59) and the DT is also a column DATE (10/05/2013)

If draw_tm is a DATE data type, then you shouldn't do a TO_DATE on it, as you don't need to convert it to a date. If you try to remove any component "hour" of him, then you must use TRUNC (draw_tm).

Similarly, with sysdate, you must use TRUNC to truncate. Never use TO_DATE datatypes in other data you causes an implicit conversion in varchar2 who depend on your NLS settings and may fail.

Select the problem

Hello
I have the following table t1 with data such as

col1
test
23
3
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6
test2
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89
67
23
test3
78
23
22

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13            test
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Maybe NOT TESTED

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SELECT, update, SELECT the problem

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