Develop Reference

Cannot parse file using JDBC

Im trying to parse a pipe delimited file and insert fields into a table. when i start the application nothing happens in my DB. My DB has 4 columns (account_name, command_name, and system_name, CreateDt). The file i am parsing has the date in the first row then extra data. The rows following i only need the first 3 fields in each the rest is extra data. the last row is the row count. i skipped the inserting date because for now but want to get back to it after at least able to insert the first 3 fields. I have little experience with parsing a file and storing data in a DB and have looked through jdbc examples to get to this point but im struggling and am sure there is a better way.
File Example
20200310|extra|extra|extra||
Mn1223|01192|windows|extra|extra|extra||
Sd1223|02390|linux|extra|extra|extra||
2
table format
account_name command_name system_name createDt
Mn1223 01192 windows 20200310
Sd1223 02390 linux 20200310
Code to parse and insert into DB
public List insertZygateData (List<ZygateEntity> parseData) throws Exception {
String filePath = "C:\\DEV\\Test_file.xlsx";
List<String> lines = Files.readAllLines(Paths.get(filePath));
// remove date and amount
lines.remove(0);
lines.remove(lines.size() - 1);
for (ZygateEntity zygateInfo : parseData){
new MapSqlParameterSource("account_name", zygateInfo.getAccountName())
.addValue("command_name", zygateInfo.getCommandName())
.addValue("system_name", zygateInfo.getSystemName())
.getValues();
}
return lines.stream()
.map(s -> s.split("[|]")).map(val -> new ZygateEntity(val[0],val[1],val[2])).collect(Collectors.toList());
}
public boolean cleantheTable() throws SQLException {
String sql = "INSERT INTO Landing.midrange_xygate_load (account_name,command_name,system_name)"+
"VALUES (:account_name,:command_name,:system_name)";
boolean truncated = false;
Statement stmt = null;
try {
String sqlTruncate = "truncate table Landing.midrange_xygate_load";
jdbcTemplate.execute(sqlTruncate);
truncated = true;
} catch (Exception e) {
e.printStackTrace();
truncated = false;
return truncated;
} finally {
if (stmt != null) {
jdbcTemplate.execute(sql);
stmt.close();
}
}
log.info("Clean the table return value :" + truncated);
return truncated;
}
}
Entity/Model
public ZygateEntity(String accountName, String commandName, String systemName){
this.accountName=accountName;
this.commandName=commandName;
this.systemName=systemName;
}
//getters and setters
#Override
public String toString() {
return "ZygateEntity [accountName=" + accountName + ", commandName=" + commandName + ", systemName=" + systemName + ", createDt=" + createDt +"]";
}
}

Taking a look at what you've provided, it seems you have a jumbled collection of bits of code, and while most of it is there, it's not all there and not quite all in the right order.
To get some kind of clarity, try to break down what it is you're doing into separate steps, and have a method that focuses on each step. In particular, you write
Im trying to parse a pipe delimited file and insert fields into a table
This naturally breaks down into two parts:
parsing the pipe-delimited file, and
inserting fields into a table.
For the first part, you seem to have most of the parts already in your insertZygateData method. In particular, this line reads all the lines of a file into a list:
List<String> lines = Files.readAllLines(Paths.get(filePath));
These lines then remove the first and last lines from the list of lines read:
// remove date and amount
lines.remove(0);
lines.remove(lines.size() - 1);
You then have some code that looks a bit out of place: this seems to be something to do with inserting into the database, but we haven't created our list of ZygateEntity objects as we haven't yet finished reading the file. Let's put this for loop to one side for the moment.
Finally, we take the list of lines we read, split them using pipes, create ZygateEntity objects from the parts and create a List of these objects, which we then return.
return lines.stream()
.map(s -> s.split("[|]")).map(val -> new ZygateEntity(val[0],val[1],val[2])).collect(Collectors.toList());
Putting this lot together, we have a useful method that parses the file, completing the first part of the task:
private List<ZygateEntity> parseZygateData() throws IOException {
String filePath = "C:\\DEV\\Test_file.xlsx";
List<String> lines = Files.readAllLines(Paths.get(filePath));
// remove date and amount
lines.remove(0);
lines.remove(lines.size() - 1);
return lines.stream()
.map(s -> s.split("[|]")).map(val -> new ZygateEntity(val[0],val[1],val[2])).collect(Collectors.toList());
}
(Of course, we could add a parameter for the file path to read, but in the interest of getting something working, it's OK to stick with the current hard-coded file path.)
So, we've got our list of ZygateEntity objects. How do we write a method to insert them into the database?
We can find a couple of the ingredients we need in your code sample. First, we need the SQL statement to insert the data. This is in your cleanThetable method:
String sql = "INSERT INTO Landing.midrange_xygate_load (account_name,command_name,system_name)"+
"VALUES (:account_name,:command_name,:system_name)";
We then have this loop:
for (ZygateEntity zygateInfo : parseData){
new MapSqlParameterSource("account_name", zygateInfo.getAccountName())
.addValue("command_name", zygateInfo.getCommandName())
.addValue("system_name", zygateInfo.getSystemName())
.getValues();
}
This loop creates a MapSqlParameterSource out of each ZygateEntity object, and then converts it to a Map<String, Object> by calling the getValues() method. But then it does nothing with this value. Effectively you're creating these objects and getting rid of them again without doing anything with them. This isn't ideal.
A MapSqlParameterSource is used with a Spring NamedParameterJdbcTemplate. Your code mentions a jdbcTemplate, which appears to be a field within the class that parses data and inserts into the database, but you don't show the full code of this class. I'm going to have to assume it's a NamedParameterJdbcTemplate rather than a 'plain' JdbcTemplate.
A NamedParameterJdbcTemplate contains a method update that takes a SQL string and a SqlParameterSource. We have a SQL string, and we're creating MapSqlParameterSource objects, so we can use these to carry out the insert. There's not a lot of point in creating one of these MapSqlParameterSource objects only to convert it to a map, so let's remove the call to getValues().
So, we now have a method to insert the data into the database:
public void insertZygateData(List<ZygateEntity> parseData) {
String sql = "INSERT INTO Landing.midrange_xygate_load (account_name,command_name,system_name)"+
"VALUES (:account_name,:command_name,:system_name)";
for (ZygateEntity zygateInfo : parseData){
SqlParameterSource source = new MapSqlParameterSource("account_name", zygateInfo.getAccountName())
.addValue("command_name", zygateInfo.getCommandName())
.addValue("system_name", zygateInfo.getSystemName());
jdbcTemplate.update(sql, source);
}
}
Finally, let's take a look at your cleanThetable method. As with the others, let's keep it focused on one task: it looks like at the moment you're trying to delete the data out of the table and then insert it in the same method, but let's have it just focus on deleting the data as we've now got a method to insert the data.
We can't immediately get rid of the String sql = ... line, because the finally block in your code uses it. If stmt is not null, then you attempt to run the INSERT statement and then close stmt.
However, stmt is never assigned any value other than null, so it remains null. stmt != null is therefore always false, so the INSERT statement never runs. Your finally block never does anything, so you would be best off removing it altogether. With your finally block gone, you can also get rid of your local variable stmt and the sql string, leaving us with a method whose focus is to truncate the table:
public boolean cleantheTable() throws SQLException {
boolean truncated = false;
try {
String sqlTruncate = "truncate table Landing.midrange_xygate_load";
jdbcTemplate.execute(sqlTruncate);
truncated = true;
} catch (Exception e) {
e.printStackTrace();
truncated = false;
return truncated;
}
log.info("Clean the table return value :" + truncated);
return truncated;
}
I'll leave it up to you to write the code that calls these methods. I wrote some code for this purpose, and it ran successfully and inserted into a database.
So, in summary, no data was being written to your database because you were never making a call to the database to insert any. In your insertZygateData method you were creating the parameter-source objects but not doing anything useful with them, and in your cleanThetable method, it looked like you were trying to insert data, but your line jdbcTemplate.execute(sql) that attempted to do this never ran. Even if stmt wasn't null, this line wouldn't work as you didn't pass the parameter values in anywhere: you would get an exception from the database as it would be expecting values for the parameters but you never gave it any.
Hopefully my explanation gives you a way of getting your code working and helps you understand why it wasn't.

BAPI_PERSDATA_CHANGE to update user data using SAP JCo 3

I'm using the following code snippet. The goal is to update the user lastname firstname and co using the BAPI_PERSDATA_CHANGE bapi. But somehow it's not working, I tried a lot of possibilities but it's not working. The message to the function related to BAPI_PERSDATA_CHANGE is:
No data stored for 0002 in the selected period
I'm using the following code
public boolean writeData(long id, HashMap<String, String> userData) throws Exception{
String DST1 = "ABAP_AS";
JCoDestination dest = JCoDestinationManager.getDestination(DST1);
JCoFunctionTemplate template = dest.getRepository().getFunctionTemplate("BAPI_PERSDATA_CHANGE");
JCoFunction jcoFunction = template.getFunction();
jcoFunction.getImportParameterList().setValue("EMPLOYEENUMBER", id);
//jcoFunction.getImportParameterList().setValue("SUBTYPE", "002");
//jcoFunction.getImportParameterList().setValue("OBJECTID", "");
//jcoFunction.getImportParameterList().setValue("LOCKINDICATOR", "");
jcoFunction.getImportParameterList().setValue("VALIDITYBEGIN", "19570101"); //"1994-04-24");
jcoFunction.getImportParameterList().setValue("VALIDITYEND", "99991231");
jcoFunction.getImportParameterList().setValue("RECORDNUMBER", "000");
jcoFunction.getImportParameterList().setValue("FIRSTNAME", "FOfie modifier");
JCoFunction jCoFunction1 = dest.getRepository().getFunctionTemplate("BAPI_TRANSACTION_COMMIT").getFunction();
JCoFunction BAPI_EMPLOYEE_DEQUEUE = dest.getRepository().getFunction("BAPI_EMPLOYEE_DEQUEUE");
BAPI_EMPLOYEE_DEQUEUE.getImportParameterList().setValue("NUMBER", id);
jcoFunction.execute(dest);
jCoFunction1.execute(dest);
BAPI_EMPLOYEE_DEQUEUE.execute(dest);
JCoContext.end(dest);
return false;
}
Am I missing something ? Or doing something wrong ?

The problem is exactly described in the error message.
No data stored for 0002 in the selected period
means that there is no data for the infotype 0002 for the period given in the parameters VALIDITYBEGIN and VALIDITYEND hence there is nothing to be updated.
Ensure that the data for the aforementioned infotype is provided for the EMPLOYEENUMBER in the requested period of time.

The line
JCoContext.begin(dest);
is missing. Therefore the execution of BAPI_PERSDATA_CHANGE and of BAPI_TRANSACTION_COMMIT will happen in two different ABAP sessions...

Neo4j ExecutionEngine does not return valid results

Trying to use a similar example from the sample code found here
My sample function is:
void query()
{
String nodeResult = "";
String rows = "";
String resultString;
String columnsString;
System.out.println("In query");
// START SNIPPET: execute
ExecutionEngine engine = new ExecutionEngine( graphDb );
ExecutionResult result;
try ( Transaction ignored = graphDb.beginTx() )
{
result = engine.execute( "start n=node(*) where n.Name =~ '.*79.*' return n, n.Name" );
// END SNIPPET: execute
// START SNIPPET: items
Iterator<Node> n_column = result.columnAs( "n" );
for ( Node node : IteratorUtil.asIterable( n_column ) )
{
// note: we're grabbing the name property from the node,
// not from the n.name in this case.
nodeResult = node + ": " + node.getProperty( "Name" );
System.out.println("In for loop");
System.out.println(nodeResult);
}
// END SNIPPET: items
// START SNIPPET: columns
List<String> columns = result.columns();
// END SNIPPET: columns
// the result is now empty, get a new one
result = engine.execute( "start n=node(*) where n.Name =~ '.*79.*' return n, n.Name" );
// START SNIPPET: rows
for ( Map<String, Object> row : result )
{
for ( Entry<String, Object> column : row.entrySet() )
{
rows += column.getKey() + ": " + column.getValue() + "; ";
System.out.println("nested");
}
rows += "\n";
}
// END SNIPPET: rows
resultString = engine.execute( "start n=node(*) where n.Name =~ '.*79.*' return n.Name" ).dumpToString();
columnsString = columns.toString();
System.out.println(rows);
System.out.println(resultString);
System.out.println(columnsString);
System.out.println("leaving");
}
}
When I run this in the web console I get many results (as there are multiple nodes that have an attribute of Name that contains the pattern 79. Yet running this code returns no results. The debug print statements 'in loop' and 'nested' never print either. Thus this must mean there are not results found in the Iterator, yet that doesn't make sense.
And yes, I already checked and made sure that the graphDb variable is the same as the path for the web console. I have other code earlier that uses the same variable to write to the database.
EDIT - More info
If I place the contents of query in the same function that creates my data, I get the correct results. If I run the query by itself it returns nothing. It's almost as the query works only in the instance where I add the data and not if I come back to the database cold in a separate instance.
EDIT2 -
Here is a snippet of code that shows the bigger context of how it is being called and sharing the same DBHandle
package ContextEngine;
import ContextEngine.NeoHandle;
import java.util.LinkedList;
/*
* Class to handle streaming data from any coded source
*/
public class Streamer {
private NeoHandle myHandle;
private String contextType;
Streamer()
{
}
public void openStream(String contextType)
{
myHandle = new NeoHandle();
myHandle.createDb();
}
public void streamInput(String dataLine)
{
Context context = new Context();
/*
* get database instance
* write to database
* check for errors
* report errors & success
*/
System.out.println(dataLine);
//apply rules to data (make ContextRules do this, send type and string of data)
ContextRules contextRules = new ContextRules();
context = contextRules.processContextRules("Calls", dataLine);
//write data (using linked list from contextRules)
NeoProcessor processor = new NeoProcessor(myHandle);
processor.processContextData(context);
}
public void runQuery()
{
NeoProcessor processor = new NeoProcessor(myHandle);
processor.query();
}
public void closeStream()
{
/*
* close database instance
*/
myHandle.shutDown();
}
}
Now, if I call streamInput AND query in in the same instance (parent calls) the query returns results. If I only call query and do not enter ANY data in that instance (yet web console shows data for same query) I get nothing. Why would I have to create the Nodes and enter them into the database at runtime just to return a valid query. Shouldn't I ALWAYS get the same results with such a query?

You mention that you are using the Neo4j Browser, which comes with Neo4j. However, the example you posted is for Neo4j Embedded, which is the in-process version of Neo4j. Are you sure you are talking to the same database when you try your query in the Browser?
In order to talk to Neo4j Server from Java, I'd recommend looking at the Neo4j JDBC driver, which has good support for connecting to the Neo4j server from Java.
http://www.neo4j.org/develop/tools/jdbc
You can set up a simple connection by adding the Neo4j JDBC jar to your classpath, available here: https://github.com/neo4j-contrib/neo4j-jdbc/releases Then just use Neo4j as any JDBC driver:
Connection conn = DriverManager.getConnection("jdbc:neo4j://localhost:7474/");
ResultSet rs = conn.executeQuery("start n=node({id}) return id(n) as id", map("id", id));
while(rs.next()) {
System.out.println(rs.getLong("id"));
}
Refer to the JDBC documentation for more advanced usage.
To answer your question on why the data is not durably stored, it may be one of many reasons. I would attempt to incrementally scale back the complexity of the code to try and locate the culprit. For instance, until you've found your problem, do these one at a time:
Instead of looping through the result, print it using System.out.println(result.dumpToString());
Instead of the regex query, try just MATCH (n) RETURN n, to return all data in the database
Make sure the data you are seeing in the browser is not "old" data inserted earlier on, but really is an insert from your latest run of the Java program. You can verify this by deleting the data via the browser before running the Java program using MATCH (n) OPTIONAL MATCH (n)-[r]->() DELETE n,r;
Make sure you are actually working against the same database directories. You can verify this by leaving the server running. If you can still start your java program, unless your Java program is using the Neo4j REST Bindings, you are not using the same directory. Two Neo4j databases cannot run against the same database directory simultaneously.

Error on Updating Table in Sqlite

When trying to update a record for one of my records I am using this code
private void UpdateCattleRecord(UpdateCattleRecord updateRecord){
mDB.beginTransaction();
String where = "_ID=";
String[] RecordToUpdate = {Cattle._ID};
Toast.makeText(this,"Updating Animal "+ RecordToUpdate, Toast.LENGTH_LONG).show();
try {
ContentValues CattleFieldsToUpdate = new ContentValues();
CattleFieldsToUpdate.put(Cattle.CATTLE_ANIMALID,updateRecord.getCattleName());
CattleFieldsToUpdate.put(Cattle.CATTLE_TYPE, updateRecord.getCattleType());
CattleFieldsToUpdate.put(Cattle.CATTLE_LOCATION, updateRecord.getCattleLocation());
CattleFieldsToUpdate.put(Cattle.CATTLE_DOB, updateRecord.getCattleDob());
CattleFieldsToUpdate.put(Cattle.CATTLE_DAM, updateRecord.getCattleDam());
CattleFieldsToUpdate.put(Cattle.CATTLE_SEX, updateRecord.getCattleSex());
mDB.update(Cattle.CATTLE_TABLE_NAME,CattleFieldsToUpdate, where, RecordToUpdate);
mDB.setTransactionSuccessful();
} finally {
mDB.endTransaction();
}
}
My log shows
Tag Database sqlite returned: error code =1, msg = near "=": syntax error
After researching this, I think I have everything in the right place but obviously I don't,
when I look at the next error in the log it's of course in 'red' and it shows me all the correct data,
03-27 15:15:29.291: E/Database(12011): Error updating date_of_birth=March 27, 2012 animaltype=Calf sex=F location=Eastern dam=601 animal_id=601A using UPDATE cattle SET date_of_birth=?, animaltype=?, sex=?, location=?, dam=?, animal_id=? WHERE _ID=
I've obviously got a problem with the value for _ID but can't seem to locate it. Can someone please point out where my Syntax error is?
Update
The problem occurred because I was failing to pass the actual value of the record (_ID) that I wanted to update. Once I passed that as a parameter to my updaterecords function the update went as scheduled.
Thanks for the input, it helped me narrow down what I was doing wrong.

Check your database creation, your probably have a column named _id(although you refer to it by _ID, its name is _id) and not _ID:
String where = "_id= ?"; // ? represent the value from the selection arguments String array
or better:
String where = Cattle._ID + "= ?";
Edit:
In your where selection argument you put:
String[] RecordToUpdate = {Cattle._ID};
you probably want to put in there some id you get from somewhere(of the record you want to update, a long number), right now you're doing:
WHERE _ID = _ID (or _id)
and this will fail.

try:
mDB.update(Cattle.CATTLE_TABLE_NAME,CattleFieldsToUpdate, "_ID="+Cattle._ID, null);
try:
mDB.update(Cattle.CATTLE_TABLE_NAME,CattleFieldsToUpdate, "_ID="+updateRecord.getId(), null);

DWR addRows() with Element ID's

Calling All DWR Gurus!
I am currently using reverse Ajax to add data to a table in a web page dynamically.
When I run the following method:
public static void addRows(String tableBdId, String[][] data) {
Util dwrUtil = new Util(getSessionForPage()); // Get all page sessions
dwrUtil.addRows(tableBdId, data);
}
The new row gets created in my web page as required.
However, in order to update these newly created values later on the tags need to have an element ID for me to access.
I have had a look at the DWR javadoc and you can specify some additional options see http://directwebremoting.org/dwr/browser/addRows , but this makes little sense to me, the documentation is very sparse.
If anyone could give me a clue as to how I could specify the element id's for the created td elements I would be most grateful. Alternatively if anyone knows of an alternative approach I would be keen to know.
Kind Regards
Karl

The closest I could get was to pass in some arguments to give the element an id. See below:
public static void addRows(String tableBdId, String[] data, String rowId) {
Util dwrUtil = new Util(getSessionForPage()); // Get all page sessions
// Create the options, which is needed to add a row ID
String options = "{" +
" rowCreator:function(options) {" +
" var row = document.createElement(\"tr\");" +
" row.setAttribute('id','" + rowId + "'); " +
" return row;" +
" }," +
" cellCreator:function(options) {" +
" var td = document.createElement(\"td\");" +
" return td;" +
" }," +
" escapeHtml:true\"}";
// Wrap the supplied row into an array to match the API
String[][] args1 = new String[][] { data };
dwrUtil.addRows(tableBdId, args1, options);

Is this line of your code really working??
dwrUtil.addRows(tableBdId, data);
The DWR addRows method needs at least 3 parameters of 4 to work, they are:
id: The id of the table element (preferably a tbody element);
array: Array (or object from DWR 1.1) containing one entry for each row in the updated table;
cellfuncs: An array of functions (one per column) for extracting cell data from the passed row data;
options: An object containing various options.
The id, array and cellfuncs are required, and in your case, you'll have to pass the options also because you want to customize the row creation and set the TD id's. check it out:
Inside the options argument, you need to use one parameter called "cellCreator" to inform your own way to create the td html element.
Check it out:
// Use the cellFuncs var to set the values you want to display inside the table rows
// the syntax is object.property
// use one function(data) for each property you need to show on your table.
var cellFuncs = [
function(data) { return data.name_of_the_first_object_property ,
function(data) { return data.name_of_the_second_object_property; }
];
DWRUtil.addRows(
tableBdId,
data,
cellFuncs,
{
// This function is used for you customize the generated td element
cellCreator:function(options) {
var td = document.createElement("td");
// setting the td element id using the rowIndex
// just implement your own id bellow
td.id = options.rowIndex;
return td;
}
});