Hi, Jose,
Here is a sample test code based on some input from a user.
In the source code distribution, there is a java directory that
provides some minimal functions accessible through java.
Good luck.
John
On 7/15/15 1:28 PM, José Vitor Delgado Leite wrote:
> Hello everybody,
>
> I need to add a column in a partition that already have other columns,
> so I made a scipt in Java for generate the binary file of this new
> column in the same directory. But FastBit isn't reading the binary
> file correctly.
>
> Since I'm programming in Java, I don't think that I could use the
> native data type for storage as same as FastBit does. I would like to
> know how the binary files are created in a partition. Which is the
> encoding of those files?
>
> Is there any way of create this binary file in Java and FastBit be
> able to read it?
>
> Thank you,
> José Leite
>
>
> _______________________________________________
> FastBit-users mailing list
> [email protected]
> https://hpcrdm.lbl.gov/cgi-bin/mailman/listinfo/fastbit-users
>
/** a tester based on code fragments from Bailu Ding (LinkedIn)
Started on May 29, 2013.
*/
import java.io.*;
import java.util.Random;
import gov.lbl.fastbit.*;
public class bailu {
public static void main(String args[]) {
try {
int cnt = buildPart("tmp", 750);
queryTest("tmp", cnt);
}
catch (Exception e) {
System.out.println(e);
}
}
/** Build a data partition for testing. Return the number of string
* values that are equal to '0123456789'.
*/
public static int buildPart(String partdir, long key)
throws FastBitStringWriterException {
int size = 10;
Random rand = new Random();
int resCnt = 0;
String[] strArr = new String[size];
long[] longArr = new long[size];
for (int i = 0; i < size; ++i) {
longArr[i] = rand.nextLong() % 1024;
if (longArr[i] < key) {
// System.out.println("@ " + i);
strArr[i] = "123456789";
++resCnt;
}
else {
strArr[i] = "987654321";
}
}
FastBit fb = new FastBit(null);
FastBitStringWriter writer = new FastBitStringWriter();
fb.add_longs("long", longArr);
fb.write_buffer(partdir);
writer.addText(partdir, "str", strArr, "UTF-8");
writer.addStringColumnToMetadata(partdir, "str", "text");
return resCnt;
}
public static void queryTest(String partdir, int cnt)
throws FastBitStringWriterException {
FastBit fb = new FastBit(null);
fb.set_message_level(8);
String where = "str = '123456789'";
FastBit.QueryHandle handle = fb.build_query("", partdir, where);
int resCnt = fb.get_result_size(handle);
if (cnt == resCnt) {
System.out.println("queryTest found " + cnt
+ " tuples as expected");
}
else {
System.out.println("Warning -- queryTest found " + resCnt
+ " tuples, but " + cnt + " was expected");
}
}
}
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