SAP JCO3 table empty - sap

I am re-writing my JCO2 code to JCO3 code to run on a 64 bit windows server. When I try to read my SAP table with the JCO3 code it is returning an empty table. However when I run the JCO2 code I have 2 records in the table.
Here is a snipet of my JCO3 code:
try
{
System.out.print("after try");
try {
ABAP_AS2 = JCoDestinationManager.getDestination(ABAP_MS);
}
catch (Exception e) {
ABAP_AS2 = null;
System.out.print("ABAP_AS2 = null");
}
ABAP_AS2.ping();
JCoFunction function = ABAP_AS2.getRepository().getFunction("ZPC_RFC_READ_QMLN");
function.execute(ABAP_AS2);
System.out.println("STFC_CONNECTION finished:");
JCoTable return_table = function.getTableParameterList().getTable("DATA");
Sytem.out.println("get table");
int records = return_table.getRow();
System.out.println(records);
The result is records = 0. When I run the JCO2 code on the same table the result is records = 2.
Please tell me what I am missing.

Apparently you haven’t read the API documentation:
`int getRow()`
Returns the current row number. The first row number is 0, the second is 1, and so on.
You probably want to switch to getNumRows().

Related

Why can I not use Continuation when using a proxy class to access MS CRM 2013?

So I have a standard service reference proxy calss for MS CRM 2013 (i.e. right-click add reference etc...) I then found the limitation that CRM data calls limit to 50 results and I wanted to get the full list of results. I found two methods, one looks more correct, but doesn't seem to work. I was wondering why it didn't and/or if there was something I'm doing incorrectly.
Basic setup and process
crmService = new CrmServiceReference.MyContext(new Uri(crmWebServicesUrl));
crmService.Credentials = System.Net.CredentialCache.DefaultCredentials;
var accountAnnotations = crmService.AccountSet.Where(a => a.AccountNumber = accountNumber).Select(a => a.Account_Annotation).FirstOrDefault();
Using Continuation (something I want to work, but looks like it doesn't)
while (accountAnnotations.Continuation != null)
{
accountAnnotations.Load(crmService.Execute<Annotation>(accountAnnotations.Continuation.NextLinkUri));
}
using that method .Continuation is always null and accountAnnotations.Count is always 50 (but there are more than 50 records)
After struggling with .Continutation for a while I've come up with the following alternative method (but it seems "not good")
var accountAnnotationData = accountAnnotations.ToList();
var accountAnnotationFinal = accountAnnotations.ToList();
var index = 1;
while (accountAnnotationData.Count == 50)
{
accountAnnotationData = (from a in crmService.AnnotationSet
where a.ObjectId.Id == accountAnnotationData.First().ObjectId.Id
select a).Skip(50 * index).ToList();
accountAnnotationFinal = accountAnnotationFinal.Union(accountAnnotationData).ToList();
index++;
}
So the second method seems to work, but for any number of reasons it doesn't seem like the best. Is there a reason .Continuation is always null? Is there some setup step I'm missing or some nice way to do this?
The way to get the records from CRM is to use paging here is an example with a query expression but you can also use fetchXML if you want
// Query using the paging cookie.
// Define the paging attributes.
// The number of records per page to retrieve.
int fetchCount = 3;
// Initialize the page number.
int pageNumber = 1;
// Initialize the number of records.
int recordCount = 0;
// Define the condition expression for retrieving records.
ConditionExpression pagecondition = new ConditionExpression();
pagecondition.AttributeName = "address1_stateorprovince";
pagecondition.Operator = ConditionOperator.Equal;
pagecondition.Values.Add("WA");
// Define the order expression to retrieve the records.
OrderExpression order = new OrderExpression();
order.AttributeName = "name";
order.OrderType = OrderType.Ascending;
// Create the query expression and add condition.
QueryExpression pagequery = new QueryExpression();
pagequery.EntityName = "account";
pagequery.Criteria.AddCondition(pagecondition);
pagequery.Orders.Add(order);
pagequery.ColumnSet.AddColumns("name", "address1_stateorprovince", "emailaddress1", "accountid");
// Assign the pageinfo properties to the query expression.
pagequery.PageInfo = new PagingInfo();
pagequery.PageInfo.Count = fetchCount;
pagequery.PageInfo.PageNumber = pageNumber;
// The current paging cookie. When retrieving the first page,
// pagingCookie should be null.
pagequery.PageInfo.PagingCookie = null;
Console.WriteLine("#\tAccount Name\t\t\tEmail Address");while (true)
{
// Retrieve the page.
EntityCollection results = _serviceProxy.RetrieveMultiple(pagequery);
if (results.Entities != null)
{
// Retrieve all records from the result set.
foreach (Account acct in results.Entities)
{
Console.WriteLine("{0}.\t{1}\t\t{2}",
++recordCount,
acct.EMailAddress1,
acct.Name);
}
}
// Check for more records, if it returns true.
if (results.MoreRecords)
{
// Increment the page number to retrieve the next page.
pagequery.PageInfo.PageNumber++;
// Set the paging cookie to the paging cookie returned from current results.
pagequery.PageInfo.PagingCookie = results.PagingCookie;
}
else
{
// If no more records are in the result nodes, exit the loop.
break;
}
}

How to get the ID of inserted row in JDBC with old driver?

I want to get auto increment id of inserted row. I know that there is a lot of examples how to do that:
link1
link2
But I use HSQL 1.8.0.10 and following code:
PreparedStatement ps = conn.prepareStatement("insert into dupa (v1) values(3)", Statement.RETURN_GENERATED_KEYS);
throws expection:
java.sql.SQLException: This function is not supported
How to get id if driver does not support the above solution. Is any other way to get auto increment key of inserted row? I want to handle as much as possible drivers. So want to use obove code in try section and use another way in catch section.
Second question: Is possible that database does not support this feature. So even if I use new driver and old database It will still not work? I tried to use hsql 2.3.2 driver but I can not to connect to 1.8.0.10 database.
The following code illustrates how to retrieve generated keys from HSQLDB 2.2.9 and later using the included JDBC 4 driver. This method returns a two element long[]. The first element contains the number of rows that were updated; the second contains the generated key if any:
static final long[] doUpdate( ... ) {
final long[] k = new long[] {0, KEY_UNDEFINED};
PreparedStatement ps = null;
try {
ps = CXN.get().prepareStatement(sql, Statement.RETURN_GENERATED_KEYS);
JdbcValue jv;
for (int i = 0; i < data.size(); i++) {
jv = data.get(i);
jv.type().setJdbcParameter(i + 1, ps, jv);
}
k[NUM_OF_ROWS] = (long) ps.executeUpdate();
if (k[NUM_OF_ROWS] > 0L) {
try (ResultSet rs = ps.getGeneratedKeys()) {
final String identColName = idCol.colName();
while (rs.next()) {
if (k[ROW_CREATED] != KEY_UNDEFINED) throw new AssertionError();
k[ROW_CREATED] = rs.getLong(identColName);
}
}
}
} catch (SQLException e) { ... }
finally {
try { if (ps != null) ps.close(); } catch (SQLException e) { }
}
return k;
}
I am unable to say whether this approach will work with old versions of HSQLDB.
You will have to use some vendor-specific solution, i.e. in mysql you would call LAST_INSERT_ID function.
I don't have valid installation of HSQL to test it, but you can give a try to the highest voted solution from this topic: how to return last inserted (auto incremented) row id in HSQL?

Dapper.Net and the DataReader

I have a very strange error with dapper:
there is already an open DataReader associated with this Command
which must be closed first
But I don't use DataReader! I just call select query on my server application and take first result:
//How I run query:
public static T SelectVersion(IDbTransaction transaction = null)
{
return DbHelper.DataBase.Connection.Query<T>("SELECT * FROM [VersionLog] WHERE [Version] = (SELECT MAX([Version]) FROM [VersionLog])", null, transaction, commandTimeout: DbHelper.CommandTimeout).FirstOrDefault();
}
//And how I call this method:
public Response Upload(CommitRequest message) //It is calling on server from client
{
//Prepearing data from CommitRequest
using (var tr = DbHelper.DataBase.Connection.BeginTransaction(IsolationLevel.Serializable))
{
int v = SelectQueries<VersionLog>.SelectVersion(tr) != null ? SelectQueries<VersionLog>.SelectVersion(tr).Version : 0; //Call my query here
int newVersion = v + 1; //update version
//Saving changes from CommitRequest to db
//Updated version saving to base too, maybe it is problem?
return new Response
{
Message = String.Empty,
ServerBaseVersion = versionLog.Version,
};
}
}
}
And most sadly that this exception appearing in random time, I think what problem in concurrent access to server from two clients.
Please help.
This some times happens if the model and database schema are not matching and an exception is being raised inside Dapper.
If you really want to get into this, best way is to include dapper source in your project and debug.

JDBC select query returns wrong values

I was performing JDBC select query in my web service to return some values from my database. Part of this table is attached to this question. After performing following query:
SELECT * FROM uses WHERE uses_user_fk='22';
I receive only one row, but in database are two values that meet the query conditions, as you can see in attached picture. Can anyone tell me where I made a mistake. I’m using following JDBC instruction to execute the query
ResultSet tempResultSet = statement.executeQuery(query);
Bellow image of database table uses:
Below the compete method that query the database, argument query is the same as listed earlier “SELECT * FROM uses…”. I should add that the answer for that query is 4, I also try this query without using quotes (uses_user_fk=22) but the result was the same:
protected ArrayList<Integer> queryForIds(String query, String column) throws Exception {
ArrayList<Integer> ids = new ArrayList<>();
try {
Class.forName("com.mysql.jdbc.Driver");
connect = DriverManager
.getConnection(GeneralDatabaseConstants.DATABASE_CONNECTION_URL);
statement = connect.createStatement();
ResultSet tempResultSet = statement.executeQuery(query);
if (tempResultSet.next())
ids.add(new Integer(tempResultSet.getInt(column)));
} catch (Exception e) {
throw e;
} finally {
close();
}
return ids;
}
replace
if (tempResultSet.next())
with
while (tempResultSet.next())

figuring out reason for maxClauseCount is set to 1024 error

I've two sets of search indexes.
TestIndex (used in our test environment) and ProdIndex(used in PRODUCTION environment).
Lucene search query: +date:[20090410184806 TO 20091007184806] works fine for test index but gives this error message for Prod index.
"maxClauseCount is set to 1024"
If I execute following line just before executing search query, then I do not get this error.
BooleanQuery.SetMaxClauseCount(Int16.MaxValue);
searcher.Search(myQuery, collector);
Am I missing something here? Why am not getting this error in test index?The schema for two indexes are same.They only differ wrt to number of records/data.PROD index has got higher number of records(around 1300) than those in test one (around 950).
The range query essentially gets transformed to a boolean query with one clause for every possible value, ORed together.
For example, the query +price:[10 to 13] is tranformed to a boolean query
+(price:10 price:11 price:12 price:13)
assuming all the values 10-13 exist in the index.
I suppose, all of your 1300 values fall in the range you have given. So, boolean query has 1300 clauses, which is higher than the default value of 1024. In the test index, the limit of 1024 is not reached as there are only 950 values.
I had the same problem. My solution was to catch BooleanQuery.TooManyClauses and dynamically increase maxClauseCount.
Here is some code that is similar to what I have in production.
private static Hits searchIndex(Searcher searcher, Query query) throws IOException
{
boolean retry = true;
while (retry)
{
try
{
retry = false;
Hits myHits = searcher.search(query);
return myHits;
}
catch (BooleanQuery.TooManyClauses e)
{
// Double the number of boolean queries allowed.
// The default is in org.apache.lucene.search.BooleanQuery and is 1024.
String defaultQueries = Integer.toString(BooleanQuery.getMaxClauseCount());
int oldQueries = Integer.parseInt(System.getProperty("org.apache.lucene.maxClauseCount", defaultQueries));
int newQueries = oldQueries * 2;
log.error("Too many hits for query: " + oldQueries + ". Increasing to " + newQueries, e);
System.setProperty("org.apache.lucene.maxClauseCount", Integer.toString(newQueries));
BooleanQuery.setMaxClauseCount(newQueries);
retry = true;
}
}
}
I had this same issue in C# code running with the Sitecore web content management system. I used Randy's answer above, but was not able to use the System get and set property functionality. Instead I retrieved the current count, incremented it, and set it back. Worked great!
catch (BooleanQuery.TooManyClauses e)
{
// Increment the number of boolean queries allowed.
// The default is 1024.
var currMaxClause = BooleanQuery.GetMaxClauseCount();
var newMaxClause = currMaxClause + 1024;
BooleanQuery.SetMaxClauseCount(newMaxClause);
retry = true;
}
Add This Code
#using Lucene.Net.Search;
#BooleanQuery.SetMaxClauseCount(2048);
Just put, BooleanQuery.setMaxClauseCount( Integer.MAX_VALUE );and that's it.