Hbase jdo module.
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Key: HBASE-3461
URL: https://issues.apache.org/jira/browse/HBASE-3461
Project: HBase
Issue Type: Improvement
Affects Versions: 0.90.0
Reporter: ncanis
Fix For: 0.90.1
Hello.
first of all, thanks to hbase members so mush ,
you helped me a lot.
I wrote simple jdo module for hbase newbie. I wish this module can help them.
Some features
- simple jdo
- HTable pool ( I already know HTablePool in habse )
- simple query classes ( insert,delete,update,select)
- some convinent mehtods.
- table sequence generator
I want to contribute this module to hbase
absolutely, I'll do upgrade that more than more.
again, thanks for help.
[http://code.google.com/p/hbase-jdo/]
---------------------------------------------
{code}
AbstractHBaseDBO dbo = new HBaseDBOImpl();
//drop if table is already exist.
if(dbo.isTableExist("user")){
dbo.deleteTable("user");
}
//create table
dbo.createTableIfNotExist("user",HBaseOrder.DESC,"account");
//dbo.createTableIfNotExist("user",HBaseOrder.ASC,"account");
//create index.
String[] cols={"id","name"};
dbo.addIndexExistingTable("user","account",cols);
//insert
InsertQuery insert = dbo.createInsertQuery("user");
UserBean bean = new UserBean();
bean.setFamily("account");
bean.setAge(20);
bean.setEmail("[email protected]");
bean.setId("ncanis");
bean.setName("ncanis");
bean.setPassword("1111");
insert.insert(bean);
//select 1 row
SelectQuery select = dbo.createSelectQuery("user");
UserBean resultBean =
(UserBean)select.select(bean.getRow(),UserBean.class);
// select column value.
String value =
(String)select.selectColumn(bean.getRow(),"account","id",String.class);
// search with option (QSearch has EQUAL, NOT_EQUAL, LIKE)
// select id,password,name,email from account where id='ncanis'
limit startRow,20
HBaseParam param = new HBaseParam();
param.setPage(bean.getRow(),20);
param.addColumn("id","password","name","email");
param.addSearchOption("id","ncanis",QSearch.EQUAL);
select.search("account", param, UserBean.class);
// search column value is existing.
boolean isExist =
select.existColumnValue("account","id","ncanis".getBytes());
// update password.
UpdateQuery update = dbo.createUpdateQuery("user");
Hashtable<String, byte[]> colsTable = new Hashtable<String,
byte[]>();
colsTable.put("password","2222".getBytes());
update.update(bean.getRow(),"account",colsTable);
//delete
DeleteQuery delete = dbo.createDeleteQuery("user");
delete.deleteRow(resultBean.getRow());
////////////////////////////////////
// etc
// HTable pool with apache commons pool
// borrow and release. HBasePoolManager(maxActive, minIdle
etc..)
IndexedTable table = dbo.getPool().borrow("user");
dbo.getPool().release(table);
// upload bigFile by hadoop directly.
HBaseBigFile bigFile = new HBaseBigFile();
File file = new File("doc/movie.avi");
FileInputStream fis = new FileInputStream(file);
Path rootPath = new Path("/files/");
String filename = "movie.avi";
bigFile.uploadFile(rootPath,filename,fis,true);
// receive file stream from hadoop.
Path p = new Path(rootPath,filename);
InputStream is = bigFile.path2Stream(p,4096);
{code}
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