ult;
import org.apache.hadoop.hbase.client.ResultScanner;
import org.apache.hadoop.hbase.client.Scan;
import org.apache.hadoop.hbase.util.Bytes;
public class OperateTable {
// 声明静态配置
private static Configuration conf = null;
static {
conf = HBaseConfiguration.create();
conf.set("hbase.zookeeper.quorum",
"master");
conf.set("hbase.zookeeper.property.clientPort", "2181");
}
public static void createTable(String tableName, String[] columnFamilys)
throws Exception {
HBaseAdmin hAdmin = new HBaseAdmin(conf);
if (hAdmin.tableExists(tableName)) {
System.out.println("表已经存在");
System.exit(0);
} else {
// 新建一个 scores 表的描述
HTableDescriptor tableDesc = new HTableDescriptor(tableName);
// 在描述里添加列族
for (String columnFamily : columnFamilys) {
tableDesc.addFamily(new HColumnDescriptor(columnFamily));
}
// 根据配置好的描述建表
hAdmin.createTable(tableDesc);
System.out.println("创建表成功");
}
}
// 删除数据库表
public static void deleteTable(String tableName) throws Exception {
// 新建一个数据库管理员
HBaseAdmin hAdmin = new HBaseAdmin(conf);
if (hAdmin.tableExists(tableName)) {
// 关闭一个表
hAdmin.disableTable(tableName);
// 删除一个表
hAdmin.deleteTable(tableName);
System.out.println("删除表成功");
} else {
System.out.println("删除的表不存在");
System.exit(0);
}
}
// 添加一条数据
public static void addRow(String tableName, String row,
String columnFamily, String column, String value) throws Exception {
HTable table = new HTable(conf, tableName);
Put put = new Put(Bytes.toBytes(row));
// 参数出分别：列族、列、值
put.add(Bytes.toBytes(columnFamily), Bytes.toBytes(column),
Bytes.toBytes(value));
table.put(put);
}
// 删除一条数据
public static void delRow(String tableName, String row) throws Exception {
HTable table = new HTable(conf, tableName);
Delete del = new Delete(Bytes.toBytes(row));
table.delete(del);
}
// 删除多条数据
public static void delMultiRows(String tableName, String[] rows)
throws Exception {
HTable table = new HTable(conf, tableName);
List list = new ArrayList();
for (String row : rows) {
Delete del = new Delete(Bytes.toBytes(row));
list.add(del);
}
table.delete(list);
}
// get row
public static void getRow(String tableName, String row) throws Exception {
HTable table = new HTable(conf, tableName);
Get get = new Get(Bytes.toBytes(row));
Result result = table.get(get);
// 输出结果
for (KeyValue rowKV : result.raw()) {
System.out.print("Row Name: " + new String(rowKV.getRow()) + " ");
System.out.print("Timestamp: " + rowKV.getTimestamp() + " ");
System.out.print("column Family: " + new String(rowKV.getFamily()) + " ");
System.out.print("Row Name: " + ne