Hadoop-06-using eclipse to develop hbase programs

configuration steps for developing HBase programs using Eclipse

1. Create a new generic Java project.

2. --java build path--libraries--add external jars, add hadoop installation directory hbase-0.90.5.jar hbase-0.90.5-tests.jar, hbase installation directory lib All in the directory jar file.

3. Create a new conf directory under the project root directory and copy the conf directory under the hbase installation directory . Hbase-site.xml to the folder.

4. in the project's properties --java build Path--libraries--add class folder, the newly created conf The directory is added in . The development environment is now complete.

5. Create a new Java class and add the following code:

Package com.hadoop.hbase.test;

Import org.apache.hadoop.conf.Configuration;

Import org.apache.hadoop.hbase.HBaseConfiguration;

Import Org.apache.hadoop.hbase.HColumnDescriptor;

Import Org.apache.hadoop.hbase.HTableDescriptor;

Import Org.apache.hadoop.hbase.client.Get;

Import Org.apache.hadoop.hbase.client.HBaseAdmin;

Import org.apache.hadoop.hbase.client.HTable;

Import Org.apache.hadoop.hbase.client.Put;

Import Org.apache.hadoop.hbase.client.Result;

Import Org.apache.hadoop.hbase.client.ResultScanner;

Import Org.apache.hadoop.hbase.client.Scan;

Import org.apache.hadoop.hbase.util.Bytes;

public class Hbasetest {

public static void Main (string[] args) throws Exception {

Configuration config = hbaseconfiguration.create ();

CREATE table

Hbaseadmin admin = new hbaseadmin (config);

Htabledescriptor HTD = new Htabledescriptor ("Student");

Hcolumndescriptor HCD = new Hcolumndescriptor ("address");

Hcolumndescriptor hcd2 = new Hcolumndescriptor ("info");

Htd.addfamily (HCD);

Htd.addfamily (HCD2);

Admin.createtable (HTD);

byte[] TableName = Htd.getname ();

htabledescriptor[] tables = Admin.listtables ();

if (tables.length! = 1 && bytes.equals (TableName, Tables[0].getname ())) {

throw new Exception ("Failed CREATE TABLE!!!");

}

Run some operations--a put, a get, a scan--against the table

htable table = new htable (config, tableName);

byte[] Row1 = bytes.tobytes ("John");

Put p1 = new put (ROW1);

byte[] Databytes = bytes.tobytes ("Address");

P1.add (Databytes, Bytes.tobytes ("City"), Bytes.tobytes ("WuHan"));

P1.add (Databytes, Bytes.tobytes ("province"), Bytes.tobytes ("Hubei"));

Table.put (p1);

Get g = new Get (ROW1);

Result result = Table.get (g);

SYSTEM.OUT.PRINTLN ("Result:" + result);

Scan scan = new scan ();

Resultscanner scanner = Table.getscanner (scan);

for (Result Scannerresult:scanner) {

System.out.println ("Scan:" + scannerresult);

}

Drop the table

Admin.disabletable (TableName);

Admin.deletetable (TableName);

SYSTEM.OUT.PRINTLN ("----done----");

}

}

6. Enter the hbase shelland use the list command to see the newly created table, using scan ' Student ' You can see the inserted data.

At this point, the first hbase program development is completed.

Hadoop-06-using eclipse to develop hbase programs