JAVA Array sizes - how to expand + See nice example code

Question

Hi, We are returning tables of VARCHAR, NUMBERS, BOOLEANs and
the like to Java using PL2JAVA and Oracle Sessions. Problem I am
having is the size of the Array's are undetermined, but it
appears these must be set before calling package - if package
returns more rows in tables than the calling Java arrays have,
then it fails. If we assign too many then I guess we are using
memory which will be wasted - important when this system could
have 100 simultaneous users/connections.
Has anyone got any advice - people may find the sample code below
useful at worse.
PACKAGE INTERFACE:
FUNCTION ssfk_get_metadata.ssfp_get_2metadata RETURNS VARCHAR2
Argument Name Type In/Out
Default?
P_USER_PERSON_ID NUMBER(10) IN
P_SELF_SERVE_APPLICATION VARCHAR2 IN
PT_DATA_SOURCE TABLE OF VARCHAR2(60) OUT
PT_PROMPT TABLE OF VARCHAR2(30) OUT
PT_DATA_TYPE TABLE OF VARCHAR2(30) OUT
PT_DATA_LENGTH TABLE OF NUMBER OUT
PT_DECIMAL_PLACES TABLE OF NUMBER OUT
PT_MANDATORY_IND TABLE OF VARCHAR2(1) OUT
PT_UCASE_IND TABLE OF VARCHAR2(1) OUT
PT_DISPLAY_ONLY_IND TABLE OF VARCHAR2(1) OUT
PT_WEB_LINK_CD TABLE OF VARCHAR2(10) OUT
P_TABLE_INDEX BINARY_INTEGER OUT
P_MESSAGE_NUM NUMBER(5) OUT
Code example:
public static String getApplicationMetaData (String
strPersonID, String strApplication, Session sesSession)
String strClientString = "";
if (sesSession==null)
return "CONNECTION ERROR";
else
Double dblUser = new Double(strPersonID);
//initialising of IN parameters
PDouble pdbUserPersonId = new PDouble
(dblUser.intValue());
PStringBuffer pstSelfServeApplication = new
PStringBuffer (strApplication);
//initialising of OUT parameters
PStringBuffer pstDataSource[] = new PStringBuffer
[intArraySize];
PStringBuffer pstPrompt[] = new PStringBuffer
[intArraySize];
PStringBuffer pstDataType[] = new PStringBuffer
[intArraySize];
PDouble pdbDataLength[] = new PDouble [intArraySize];
PDouble pdbDecimalPlaces[] = new PDouble
[intArraySize];
PStringBuffer pstMandatoryIND[] = new PStringBuffer
[intArraySize];
PStringBuffer pstUCaseIND[] = new PStringBuffer
[intArraySize];
PStringBuffer pstDisplayOnlyIND[] = new PStringBuffer
[intArraySize];
PStringBuffer pstWebLinkCode[] = new PStringBuffer
[intArraySize];
PInteger pinTableIndex = new PInteger (0);
PDouble pdbMessageNum = new PDouble (0);
//initialising of RETURN parameters
PStringBuffer pstReturn = new PStringBuffer("N");
//setting the array items sizes
for (int i=0; i<pstDataSource.length; i++)
pstDataSource[i] = new PStringBuffer(60);
pstPrompt[i] = new PStringBuffer(30);
pstDataType[i] = new PStringBuffer(30);
pdbDataLength[i] = new PDouble(-1);
pdbDecimalPlaces[i] = new PDouble(-1);
pstMandatoryIND[i] = new PStringBuffer(1);
pstUCaseIND[i] = new PStringBuffer(1);
pstDisplayOnlyIND[i] = new PStringBuffer(1);
pstWebLinkCode[i] = new PStringBuffer(10);
try
strClientString = strClientString.concat ("001");
ssfk_get_metadata ssfAppMetaData = new
ssfk_get_metadata (sesSession);
strClientString = strClientString.concat ("002");
pstReturn = ssfAppMetaData.ssfp_get_2metadata
(pdbUserPersonId, pstSelfServeApplication, pstDataSource,
pstPrompt, pstDataType, pdbDataLength, pdbDecimalPlaces,
pstMandatoryIND, pstUCaseIND, pstDisplayOnlyIND, pstWebLinkCode,
pinTableIndex, pdbMessageNum);
strClientString = strClientString.concat ("003");
if
(pstReturn.stringValue().equalsIgnoreCase("Y"))
strClientString = strClientString.concat
("WORKED");
return strClientString;
else
return "ERROR";
catch (Exception e)
return strClientString + "ERROR:" + e.getMessage
Thanks for any assistance.
null

Answer 1

Play with Java Vectors. They are automatic expanding arrays!
Just add elements and get them later. One thing that's tricky
is that Vectors only store and return elements as Objects so you
have to explicitly recast them.
-dan
Richard Leigh (guest) wrote:
: Hi, We are returning tables of VARCHAR, NUMBERS, BOOLEANs and
: the like to Java using PL2JAVA and Oracle Sessions. Problem I
am
: having is the size of the Array's are undetermined, but it
: appears these must be set before calling package - if package
: returns more rows in tables than the calling Java arrays have,
: then it fails. If we assign too many then I guess we are
using
: memory which will be wasted - important when this system could
: have 100 simultaneous users/connections.
: Has anyone got any advice - people may find the sample code
below
: useful at worse.
: PACKAGE INTERFACE:
: FUNCTION ssfk_get_metadata.ssfp_get_2metadata RETURNS VARCHAR2
: Argument Name Type In/Out
: Default?
: P_USER_PERSON_ID NUMBER(10) IN
: P_SELF_SERVE_APPLICATION VARCHAR2 IN
: PT_DATA_SOURCE TABLE OF VARCHAR2(60) OUT
: PT_PROMPT TABLE OF VARCHAR2(30) OUT
: PT_DATA_TYPE TABLE OF VARCHAR2(30) OUT
: PT_DATA_LENGTH TABLE OF NUMBER OUT
: PT_DECIMAL_PLACES TABLE OF NUMBER OUT
: PT_MANDATORY_IND TABLE OF VARCHAR2(1) OUT
: PT_UCASE_IND TABLE OF VARCHAR2(1) OUT
: PT_DISPLAY_ONLY_IND TABLE OF VARCHAR2(1) OUT
: PT_WEB_LINK_CD TABLE OF VARCHAR2(10) OUT
: P_TABLE_INDEX BINARY_INTEGER OUT
: P_MESSAGE_NUM NUMBER(5) OUT
: Code example:
: public static String getApplicationMetaData (String
: strPersonID, String strApplication, Session sesSession)
: String strClientString = "";
: if (sesSession==null)
: return "CONNECTION ERROR";
: else
: Double dblUser = new Double(strPersonID);
: //initialising of IN parameters
: PDouble pdbUserPersonId = new PDouble
: (dblUser.intValue());
: PStringBuffer pstSelfServeApplication = new
: PStringBuffer (strApplication);
: //initialising of OUT parameters
: PStringBuffer pstDataSource[] = new PStringBuffer
: [intArraySize];
: PStringBuffer pstPrompt[] = new PStringBuffer
: [intArraySize];
: PStringBuffer pstDataType[] = new PStringBuffer
: [intArraySize];
: PDouble pdbDataLength[] = new PDouble
[intArraySize];
: PDouble pdbDecimalPlaces[] = new PDouble
: [intArraySize];
: PStringBuffer pstMandatoryIND[] = new
PStringBuffer
: [intArraySize];
: PStringBuffer pstUCaseIND[] = new PStringBuffer
: [intArraySize];
: PStringBuffer pstDisplayOnlyIND[] = new
PStringBuffer
: [intArraySize];
: PStringBuffer pstWebLinkCode[] = new PStringBuffer
: [intArraySize];
: PInteger pinTableIndex = new PInteger (0);
: PDouble pdbMessageNum = new PDouble (0);
: //initialising of RETURN parameters
: PStringBuffer pstReturn = new PStringBuffer("N");
: //setting the array items sizes
: for (int i=0; i<pstDataSource.length; i++)
: pstDataSource[i] = new PStringBuffer(60);
: pstPrompt[i] = new PStringBuffer(30);
: pstDataType[i] = new PStringBuffer(30);
: pdbDataLength[i] = new PDouble(-1);
: pdbDecimalPlaces[i] = new PDouble(-1);
: pstMandatoryIND[i] = new PStringBuffer(1);
: pstUCaseIND[i] = new PStringBuffer(1);
: pstDisplayOnlyIND[i] = new PStringBuffer(1);
: pstWebLinkCode[i] = new PStringBuffer(10);
: try
: strClientString = strClientString.concat
("001");
: ssfk_get_metadata ssfAppMetaData = new
: ssfk_get_metadata (sesSession);
: strClientString = strClientString.concat
("002");
: pstReturn = ssfAppMetaData.ssfp_get_2metadata
: (pdbUserPersonId, pstSelfServeApplication, pstDataSource,
: pstPrompt, pstDataType, pdbDataLength, pdbDecimalPlaces,
: pstMandatoryIND, pstUCaseIND, pstDisplayOnlyIND,
pstWebLinkCode,
: pinTableIndex, pdbMessageNum);
: strClientString = strClientString.concat
("003");
: if
: (pstReturn.stringValue().equalsIgnoreCase("Y"))
: strClientString = strClientString.concat
: ("WORKED");
: return strClientString;
: else
: return "ERROR";
: catch (Exception e)
: return strClientString + "ERROR:" +
e.getMessage
: Thanks for any assistance.
null