Develop Reference

Java Mysql table data output formatting

Here is my MySql table:
I want to show the output of the query in commandline as below:
I have written the code below to loop but I am getting only the first row, What i have to modify ??
ResultSet rs2 = stmt.executeQuery(table_retrive);
String[] cols = new String[itemList.size()];
int[] rec =new int[itemList.size()];
for (int i = 0; i < itemList.size(); i++) {
while (rs2.next()) {
cols[i] =(String) itemList.get(i);
rec[i] = rs2.getInt(cols[i]);
System.out.println(rec[i]+" ");
}
}

Your two loops are wrong. Start at i=0 and then iterate once over the whole ResultSet, filling yor first array position. When this is done, i is incremented and you try to iterate the ResultSet a second time but the cursor is at the end of the ResultSet, so rs2.next() returns false and the code will not be executed.
So you have two Solutions:
Handle the loops correctly. Unfortunately I do not know, what you are trying to do anyways because this is some C-like code without OOP, which doesn't show semantics and then you have this itemList which seems to hold preset values and you read out of this list, which column to take for the i-th position. This seems odd. Maybe switching the loops does the desired: Start with the while and nest the for.
Reset the cursor of the ResultSet after the while with rs2.beforeFirst(). WARNING: This could throw a SQLFeatureNotSupportedException. Not all Databases can move the cursor backwards. This is of course a very ugly solution, since you should first parse the whole row a once.

Try to use printf() Or format() method. It is same as printf method in c lang. you can pass parameters and difference. Look at link1
And link 2
Example : System.out.printf("%d%5s%10d", 5,"|",10);
output : 5 | 10

Using this the I got all the values but in one row :
while (rs2.next()) {
for (int i = 0; i < itemList.size(); i++) {
cols[i] =(String) itemList.get(i);
rec[i] = rs2.getInt(cols[i]);
System.out.print(rec[i]+" ");
}
}
But I need to divide like the rows.

Usage of the inner loop is your problem.
You can enhance your code to remove the usage of the second loop in your code, it basically does nothing. You can loop over your result set and in the same loop using the incremented variable to persist the values accordingly.
The code shown half implemented in your question, hence it will be difficult to give you exactly what need to be done. Nevertheless, here's an attempt to resolve the problem for you:
while (rs2.next()) {
System.out.println(rs2.getInt(1) + "\t |" + rs2.getString(2) + "\t |" + rs2.getString(3));
}
Based on the column names from the table in the question, assuming that column2 and column3 are String's.
You can add the necessary details to this code to complete it according to your usecase, but I've just taken the example of showing a record in one line.
EDIT:
OP has his own way of programming, but to satisfy his question in the comment - this is how you can do it.
while (rs2.next()) {
for (int i = 0; i < itemList.size(); i++)
{
cols[i] =(String) itemList.get(i);
rec[i] = rs2.getInt(cols[i]);
System.out.print(rec[i]+"\t |");
}
System.out.println();
}

Ektorp CouchDb: Query for pattern with multiple contains

I want to query multiple candidates for a search string which could look like "My sear foo".
Now I want to look for documents which have a field that contains one (or more) of the entered strings (seen as splitted by whitespaces).
I found some code which allows me to do a search by pattern:
#View(name = "find_by_serial_pattern", map = "function(doc) { var i; if(doc.serialNumber) { for(i=0; i < doc.serialNumber.length; i+=1) { emit(doc.serialNumber.slice(i), doc);}}}")
public List<DeviceEntityCouch> findBySerialPattern(String serialNumber) {
String trim = serialNumber.trim();
if (StringUtils.isEmpty(trim)) {
return new ArrayList<>();
}
ViewQuery viewQuery = createQuery("find_by_serial_pattern").startKey(trim).endKey(trim + "\u9999");
return db.queryView(viewQuery, DeviceEntityCouch.class);
}
which works quite nice for looking just for one pattern. But how do I have to modify my code to get a multiple contains on doc.serialNumber?
EDIT:
This is the current workaround, but there must be a better way i guess.
Also there is only an OR logic. So an entry fits term1 or term2 to be in the list.
#View(name = "find_by_serial_pattern", map = "function(doc) { var i; if(doc.serialNumber) { for(i=0; i < doc.serialNumber.length; i+=1) { emit(doc.serialNumber.slice(i), doc);}}}")
public List<DeviceEntityCouch> findBySerialPattern(String serialNumber) {
String trim = serialNumber.trim();
if (StringUtils.isEmpty(trim)) {
return new ArrayList<>();
}
String[] split = trim.split(" ");
List<DeviceEntityCouch> list = new ArrayList<>();
for (String s : split) {
ViewQuery viewQuery = createQuery("find_by_serial_pattern").startKey(s).endKey(s + "\u9999");
list.addAll(db.queryView(viewQuery, DeviceEntityCouch.class));
}
return list;
}

Looks like you are implementing a full text search here. That's not going to be very efficient in CouchDB (I guess same applies to other databases).
Correct me if I am wrong but from looking at your code looks like you are trying to search a list of serial numbers for a pattern. CouchDB (or any other database) is quite efficient if you can somehow index the data you will be searching for.
Otherwise you must fetch every single record and perform a string comparison on it.
The only way I can think of to optimize this in CouchDB would be the something like the following (with assumptions):
Your serial numbers are not very long (say 20 chars?)
You force the search to be always 5 characters
Generate view that emits every single 5 char long substring from your serial number - more or less this (could be optimized and not sure if I got the in):
...
for (var i = 0; doc.serialNo.length > 5 && i < doc.serialNo.length - 5; i++) {
emit([doc.serialNo.substring(i, i + 5), doc._id]);
}
...
Use _count reduce function
Now the following url:
http://localhost:5984/test/_design/serial/_view/complex-key?startkey=["01234"]&endkey=["01234",{}]&group=true
Will return a list of documents with a hit count for a key of 01234.
If you don't group and set the reduce option to be false, you will get a list of all matches, including duplicates if a single doc has multiple hits.
Refer to http://ryankirkman.com/2011/03/30/advanced-filtering-with-couchdb-views.html for the information about complex keys lookups.
I am not sure how efficient couchdb is in terms of updating that view. It depends on how many records you will have and how many new entries appear between view is being queried (I understand couchdb rebuilds the view's b-tree on demand).
I have generated a view like that that splits doc ids into 5 char long keys. Out of over 1K docs it generated over 30K results - id being 32 char long, simple maths really: (serialNo.length - searchablekey.length + 1) * docscount).
Generating the view took a while but the lookups where fast.
You could generate keys of multiple lengths, etc. All comes down to your records count vs speed of lookups.

Apache Poi excel remove blank rows

I have an excel file with 3000 rows. I remove the 2000 (with ms excel app), but when i call the sheet.getLastRowNum() from code , it gives me 3000 (instead of 1000).. How can i remove the blank rows?
I tried the code from here but it doesn't works....

There are two ways for it:
1.) Without code:
Copy the content of your excel and paste it in a new excel, and later rename is as required.
2.) With code(I did not find any functions for it so I created my own function):
You need to check each of the cells for any type of blank/empty string/null kind of things.
Before processing the row(I am expecting you are processing row wise also I am using org.apache.poi.xssf.usermodel.XSSFRow), put a if check, and check for this method's return type in the if(condition), if it is true that means the row(XSSFRow) has some value other wise move the iterator to next row
public boolean containsValue(XSSFRow row, int fcell, int lcell)
{
boolean flag = false;
for (int i = fcell; i < lcell; i++) {
if (StringUtils.isEmpty(String.valueOf(row.getCell(i))) == true ||
StringUtils.isWhitespace(String.valueOf(row.getCell(i))) == true ||
StringUtils.isBlank(String.valueOf(row.getCell(i))) == true ||
String.valueOf(row.getCell(i)).length() == 0 ||
row.getCell(i) == null) {}
else {
flag = true;
}
}
return flag;
}
So finally your processing method will look like
.
.
.
int fcell = row.getFirstCellNum();// first cell number of excel
int lcell = row.getLastCellNum(); //last cell number of excel
while (rows.hasNext()) {
row = (XSSFRow) rows.next();//increment the row iterator
if(containsValue(row, fcell, lcell) == true){
.
.
..//processing
.
.
}
}
Hope this will help. :)

I haven't found any solution on how to easily get the "real" number of rows but I've found a solution to remove such rows which might be useful to someone who's tackling similar issue. See bellow.
I've searched a bit and found this solution
All it does is it deletes those empty rows from the bottom which might be exactly what you want.

As per my understanding for deleting rows you Must have selected all the cells and pressed Delete button. If I am right then you have deleted the rows by wrong way. By this way the cells become blank not deleted so the rows actually contain cells with blank values and that is why get included in the row count.
The correct way to do this is select the row from the left of its first cell where row numbers are appearing. Clicking there on row numbers will select the complete row. Select all required rows with the help of shift key. Now right click and then select delete.
This may be helpful for you.

remove rows/columns by poi api
transfer xls to csv
transfer csv to xls
hope this will help you

Function works only with hard coded values

This is the code I am working on:
if(connection.doDatabaseRead(findSQL))
{
ResultSet retRES = connection.getResultSet();
int i = 0;
// did we find anything
while( retRES.next() )
{
//read result from query
suiteNum.add(retRES.getString(i)); // this is the problem
i++;
//let other threads breathe
Thread.yield();
}
}
suiteNum is a string vector
When I try to add the database results to the vector the code crashes with this error.
java.sql.SQLException: Column Index out of range, 0 > 1.
I have the same piece of code working elsewhere in the program but I use real numbers like 0, 1 and 2 instead of i and it works fine.
As I do not know how many results the database request will have I need it to be dynamic but it will only work hard coded.
How can I make it work with i ?

The argument to getString is the column index, not the row index as you seem to think. The function returns the value of the given column in the current row, while next advances the cursor to the next row.
You probably mean:
suiteNum.add(retRES.getString(1));
in which case you can lose i altogether.

Java ResultSet objects are 1-indexed in this regard. The first element is at 1, not 0. See the javadoc.
EDIT: That's true too, but indeed the problem is this appears to be used as a row index! it's certainly the column.

This is your problem:
i = 0;
...
retRES.getString(i);
ResultSet.getString(i) gets a String from column number i
You want something like
while(retRes.next()) {
add(retRes.getString(1);
}

column index starts from 1
As I do not know how many results the database request will have I need it to be dynamic but it will only work hard coded. How can I make it work with i
ResultSetMetaData rsMetaData = rs.getMetaData();
int numberOfColumns = rsMetaData.getColumnCount();
See Also
ResultSetMetaData

Let your i start with 1 as specified in the API docs

if(connection.doDatabaseRead(findSQL))
{
ResultSet retRES = connection.getResultSet();
int i = 1;
// did we find anything
while( retRES.next() )
{
//read result from query
suiteNum.add(retRES.getString(i)); // this is the problem
i++;
//let other threads breathe
Thread.yield();
}
}

Selenium assertText for all text in a table?

I need to assert that each row in table contains a certain text string, either through selenium IDE or a Java test case. What's the best way to do this? Here's my current test:
Command assertText
Target //table[#id='myTable']//tbody//tr[not(#style)]/td[1]
Value myValue
I need to test the first column of every row, but this only tests the first row. Is there an easy way to test every row?

I haven't used selenium IDE, only the java API, so here how I'd do it in java (or the basic idea at least)
int numRows = selenium.getXpathCount("table[#id='myTable']//tbody//" +
"tr[not(#style)]/td[1]").intValue();
String[] values = new String[numRows];
for (int i = 0; i < numRows; i++) {
values[i] = selenium.getText("table[#id='myTable']//tbody//" +
"tr[not(#style)][" + i + "]/td[1]");
}