Make use of established database connection

From within an application in the Application Navigation, I have successfully established a connection to a database which is on another host machine. The steps are:
right-click on the name of the application > select New > Database Tier > Database Connection > Connection Name ....
After the connection is done, I am able to see the tables, etc. in the Connection Navigation, i.e., the connection was successful.
Under the same application, I created a web project and in the project I am writing a servlet. I figure I can make use of the established connection as described above, to create sql statement object? But I do not know how. For example, I named that connection SbConnection, and tried the statements:
Statment stmt = null;
stmt = SbConnection.createStatement();
But it does not work out. I am trying this because the classical way of
Class.forname(....).newInstance();
Connection conn = DriverManager.getConnection(......);
does not work no matter how I tried.
I am just starting in doing web application, servlet and JSP etc. and would appreciate a lot for any help.

Fantastic, dvohra! It works out! Thanks a lot for the know-how!
Next I am going to dig out something to read about JNDI and DataSource type of connection. But the part of editing the web.xml is magic and myth to me. Any suggested books or web sites for reading? (After know-how is know-why and know what I am doing.) Many thanks!

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/people/bhavesh.kantilal/blog/2006/07/03/jdbc-receiver-adapter--synchronous-select-150-step-by-step
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Hi,
Consider there is 2 database, Oracle_1 and Oracle_2.
I want to fetch some table data in Oracle_2 from Oracle_1 database Stored procedure/functions through query staments and cursors. How to establish the Oracle_1 DB connection in Oracle_2 DB stored procedure/function. Is it possible?
It's not the same how you implement the programs in java or .Net to create DB connection. It's different over here. You have use the DataBase Links in order to make to connection with another DB and use that Link in the stored procedure or function where ever its necessary as per your requirement.
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I want to fetch some table data in Oracle_2 from Oracle_1 database Stored procedure/functions through query staments and cursors. How to establish the Oracle_1 DB connection in Oracle_2 DB stored procedure/function. Is it possible?

Hi,
Consider there is 2 database, Oracle_1 and Oracle_2.
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In Forms I used the following code to change the user at runtime. I created 3 char fields 'u','p' and 'c' for username, password and connect string respectively.
declare
uname varchar2(10);
begin
uname := get_application_property(username);
-- To display your current username
message(uname);
pause;
logout;
logon(:u,:p| |'@'| |:c);
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Have a nice day,
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Why it takes long time to establish Database Connection ???

Can any one please have a look on the following code snippet and show me which mistake I'm doing so it take long time to connect to DB(more than 5 minutes !!!!)
Thanx in advance ...
try{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Class.forName("oracle.jdbc.driver.OracleDriver");
String dbString2 = "jdbc:oracle:thin:@" + "127.0.0.1" + ":" + "1521" + ":" + "nat";
aCon = DriverManager.getConnection(dbString2, "scott", "tiger");
stmt = aCon.createStatement();
System.out.println("Connection to DB Established");
catch (ClassNotFoundException cnfe)
System.out.println("Class not found:");
cnfe.printStackTrace();
catch (SQLException sqle)
System.out.println("SQL Exception: " + sqle.toString());
sqle.printStackTrace();

Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Why do you need this if you are going to Oracle. Try
removing this. It might be trying things out with the
old driver and then moving to the new driver. This has nothing to do with it. (And it doesn't "try things out")
>
Also check your machines. They might be slow. There is
no reason, it should take more than few hundred
milliseconds to connect to a database on localhost as
your case is.Possible reasons...
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- Busy server
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How to make use of logical database in reports?

hi,
I am working on a Cash Flow Forecast report, which requires the usage of 'PSJ' Logical Database for the selection screen with Profit Center(PRCTR) as one field and the other field being Period ( in MM/YYYY format).
I have not worked on Logical Database before. Since, its for the first time I am working on LDB, I require help on it.
How to proceed for this, can someone help me with it?
On receiving further inputs, I will proceed and might come up with some more queries.
Regards,
Ravi

Hi Hari,
Thanks a lot for being so patient. yeah, I will just send you a code snippet of mine. My code is of 3000 Lines. Hence, I will send few parts of it. Just go through and let me know if you need any further information from my side.
Here is the snippet:
*& TABLES
TABLES: PROJ,                              "Project definition.
        PRPS,                              "WBS Element Master Data
        COSP,                              "CO: External Table.
        COFP,                              "CO: External Table.
        SETLEAF,                       "Value in sets.
        FAGLFLEXT,                         "Profit Center.
        S031,                              "Statistics: Movements for Current Stocks.
        SETHEADERT,                        "short Description of Sets.
        AFVC,                              "Operation within an Order.
        AUFK,                              "Order master data.
        PRHI,                              "Work Breakdown Structure.
        AFKO,                              "Order header data PP orders.
        NRIV,                              "Number range Intervals.
        SKB1,                              "G/L Account Master (company code).
        FMCI.                              "Commitments Item master data.
Type Pool
TYPE-POOLS: SLIS.
FIELD-SYMBOLS: <DYN_TABLE> TYPE STANDARD TABLE,
               <DYN_WA>,
               <DYN_FIELD>.
DATA: COUNT TYPE I,
      D_PERIOL LIKE COFP-PERIO,
      D_PERIOH LIKE COFP-PERIO,
      D_GJAHRL LIKE COFP-GJAHR,
      D_GJAHRH LIKE COFP-GJAHR,
      D_GJAHR LIKE COFP-GJAHR,
      D_PERIO LIKE COFP-PERIO,
      OBJNR LIKE COSP-OBJNR,
      PKOKR LIKE PRPS-PKOKR,
      G_NRLEVEL LIKE NRIV-NRLEVEL,
      G_BELNR LIKE COFP-BELNR,
     I_OBJ-OBJNR LIKE COFP-OBJNR,
      G_OPNGBAL LIKE FAGLFLEXT-HSL01,
      G_PAYROLL LIKE COSP-WKG001,
      G_PYROL_TAX LIKE COFP-WKGBTR,
      G_PENSION LIKE COFP-WKGBTR,
      G_BTLDGR LIKE COFP-WKGBTR,
      G_REIMPYMT LIKE COFP-WKGBTR,
      G_INTCORCPT LIKE COFP-WKGBTR,
      G_CAPEXP LIKE COFP-WKGBTR,
      G_SLSLDGR LIKE COFP-WKGBTR,
      G_REIMRCPT LIKE COFP-WKGBTR,
      G_TOTPYMNTS LIKE COFP-WKGBTR VALUE 0,
      G_TOTRECPTS LIKE COFP-WKGBTR VALUE 0,
      G_MVMTFRMNTH LIKE COFP-WKGBTR VALUE 0,
      G_CLSGBAL LIKE COFP-WKGBTR VALUE 0.
DATA: LYEAR(4) TYPE N,
      LMONTH1(2) TYPE N,
      MON1(2) TYPE N.
DATA: HYEAR(4) TYPE N.
DATA: LMONTH(2) TYPE N.
DATA: HMONTH(2) TYPE N.
DATA: TOTAL(10) TYPE N.
DATA: SUM(10) TYPE N.
DATA: G_PSPID LIKE PROJ-PSPID.
DATA: TOTAL1 LIKE COFP-WKGBTR,
      TOTAL2 LIKE COFP-WKGBTR.
DATA: G_KOKRS LIKE COFP-KOKRS,
      G_FIPOS LIKE SKB1-FIPOS,
      G_POSIT LIKE COFP-POSIT,
      G_BUKRS LIKE COFP-BUKRS.
DATA: L_RACCT LIKE FAGLFLEXT-RACCT VALUE '0000220000',
      H_RACCT LIKE FAGLFLEXT-RACCT VALUE '0000227999'.
DATA: I TYPE I VALUE '74'.
DATA: P TYPE I VALUE '62'.
*& SELECT-OPTIONS
PARAMETERS : S_PRCTR LIKE PROJ-PRCTR.         "Profit Center
SELECT-OPTIONS: SL_SPMON FOR S031-SPMON OBLIGATORY.            "Period
*INITIALIZATION
INITIALIZATION.
SL_SPMON-SIGN = C_IN.
SL_SPMON-OPTION = C_BT.
SL_SPMON-LOW = SL_SPMON.
SL_SPMON-HIGH = SL_SPMON.
APPEND SL_SPMON.
AT SELECTION-SCREEN
Event which occurs each time the user hits enter on the selection
Screen.
AT SELECTION-SCREEN ON VALUE-REQUEST FOR SL_SPMON-LOW.
PERFORM MONAT_F4.
AT SELECTION-SCREEN ON VALUE-REQUEST FOR SL_SPMON-HIGH.
PERFORM MONAT_F4.
SELECT SINGLE * FROM PROJ WHERE PRCTR = S_PRCTR.
IF SY-SUBRC <> 0 AND NOT ( S_PRCTR IS INITIAL ).
    MESSAGE E019.
ENDIF.
ALL WBS ELEMENT SELECTION
SELECT PSPID INTO TABLE I_PROJTAB FROM PROJ WHERE PRCTR = S_PRCTR.
IF SY-SUBRC = 0.
    LOOP AT I_PROJTAB.
      CALL FUNCTION 'GET_TREE_FROM_PRHI'
        EXPORTING
          I_POSID                   = I_PROJTAB-PSPID
   I_PSPNR                   = 00000000
   NO_BUFFER                 = ' '
        TABLES
          PSP_TREE                  = I_PRHI
        EXCEPTIONS
          INPUT_ERROR               = 1
          PSP_HIERARCHY_ERROR       = 2
          PSP_NOT_FOUND             = 3
          OTHERS                    = 4
   ENDLOOP. " PROJTAB
ENDIF.
SELECT * FROM PRPS INTO TABLE I_PRPSVC FOR ALL ENTRIES IN I_PRHI
                  WHERE PSPNR = I_PRHI-POSNR.
SELECT * FROM AFVC INTO TABLE I_AFVC FOR ALL ENTRIES IN I_PRPSVC
                  WHERE PROJN = I_PRPSVC-PSPNR.
SELECT * FROM AUFK INTO TABLE I_AUFK FOR ALL ENTRIES IN I_PRPSVC
                  WHERE PSPEL = I_PRPSVC-PSPNR AND AUTYP NE C_TWENTY.
SELECT OBJNR FROM PRPS INTO TABLE I_OBJ FOR ALL ENTRIES IN I_PRHI
                  WHERE PSPNR = I_PRHI-POSNR.
IF SY-SUBRC <> 0.
    MESSAGE E010.
ENDIF.
I hope that's of some use.
Thanks & Regards,
Ravi

Make use of established database connection

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