看到网络上好多关于Java API操作HBase数据库的例子都用的是旧的API。我用新的API把 deprecated的API替换掉。
1，用HTableDescriptor tableDesc = new HTableDescriptor(TableName.valueOf(tableName)); 代替 HTableDescriptor tableDesc = new HTableDescriptor(tableName);
2，用org.apache.hadoop.hbase.Cell 代替 org.apache.hadoop.hbase.KeyValue
3，用CellUtil从Cell对象中读取相应的值
4， 用result.rawCells() 代替result.raw()
以下为全部代码：
import java.util.ArrayList;
import java.util.List;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.CellUtil;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.HColumnDescriptor;
import org.apache.hadoop.hbase.HTableDescriptor;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.Delete;
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;
import org.apache.hadoop.hbase.Cell;
public class OperateTable {
private static Configuration conf = null;
static {
conf = HBaseConfiguration.create();
//conf.set("hbase.zookeeper.quorum","master");
//conf.set("hbase.zookeeper.property.clientPort", "2181");
}
// 创建数据库表
public static void createTable(String tableName, String[] columnFamilys)
throws Exception {
// 新建一个数据库管理员
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.valueOf(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");
}
hAdmin.close();
}
// 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);
}
hAdmin.close();
}
// 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);
table.close();
}
// 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);
table.close();
}
// 删除多条数据
public static void delMultiRows(String tableName, String[] rows)
throws Exception {
HTable table = new HTable(conf, tableName);
List<Delete> list = new ArrayList<Delete>();
for (String row : rows) {
Delete del = new Delete(Bytes.toBytes(row));
list.add(del);
}
table.delete(list);
table.close();
}
// 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
Cell rowKV : result.rawCells()) {
CellUtil.cloneRow(rowKV)) + " ");
System.out.print("Timestamp: " + rowKV.getTimestamp() + " ");
CellUtil.cloneFamily(rowKV)) + " ");
CellUtil.cloneQualifier(rowKV)) + " ");
CellUtil.cloneValue(rowKV)) + " ");
}
table.close();
}
// get all records
public static void getAllRows(String tableName) throws Exception {
HTable table = new HTable(conf, tableName);
Scan scan = new Scan();
ResultScanner results = table.getScanner(scan);
// 输出结果
for (Result result : results) {
Cell rowKV : result.rawCells()) {
CellUtil.cloneRow(rowKV)) + " ");
System.out.print("Timestamp: " + rowKV.getTimestamp() + " ");
CellUtil.cloneFamily(rowKV)) + " ");
CellUtil.cloneQualifier(rowKV)) + " ");
CellUtil.cloneValue(rowKV)) + " ");
}
}
table.close();
}
// main
public static void main(String[] args) {
try {
String tableName = "users2";
// 第一步：创建数据库表：“users2”
String[] columnFamilys = { "info", "course" };
OperateTable.createTable(tableName, columnFamilys);
// 第二步：向数据表的添加数据
// 添加第一行数据
OperateTable.addRow(tableName, "tht", "info", "age", "20");
OperateTable.addRow(tableName, "tht", "info", "sex", "boy");
OperateTable.addRow(tableName, "tht", "course", "china", "97");
OperateTable.addRow(tableName, "tht", "course", "math", "128");
OperateTable.addRow(tableName, "tht", "course", "english", "85");
// 添加第二行数据
OperateTable.addRow(tableName, "xiaoxue", "info", "age", "19");
OperateTable.addRow(tableName, "xiaoxue", "info", "sex", "boy");
OperateTable.addRow(tableName, "xiaoxue", "course", "china", "90");
OperateTable.addRow(tableName, "xiaoxue", "course", "math", "120");
OperateTable
.addRow(tableName, "xiaoxue", "course", "english", "90");
// 添加第三行数据
OperateTable.addRow(tableName, "qingqing", "info", "age", "18");
OperateTable.addRow(tableName, "qingqing", "info", "sex", "girl");
OperateTable
.addRow(tableName, "qingqing", "course", "china", "100");
OperateTable.addRow(tableName, "qingqing", "course", "math", "100");
OperateTable.addRow(tableName, "qingqing", "course", "english",
"99");
// 第三步：获取一条数据
System.out.println("获取一条数据");
OperateTable.getRow(tableName, "tht");
// 第四步：获取所有数据
System.out.println("获取所有数据");
OperateTable.getAllRows(tableName);
// 第五步：删除一条数据
System.out.println("删除一条数据");
OperateTable.delRow(tableName, "tht");
OperateTable.getAllRows(tableName);
// 第六步：删除多条数据
System.out.println("删除多条数据");
String[] rows = { "xiaoxue", "qingqing" };
OperateTable.delMultiRows(tableName, rows);
OperateTable.getAllRows(tableName);
// 第八步：删除数据库
System.out.println("删除数据库");
OperateTable.deleteTable(tableName);
} catch (Exception err) {
err.printStackTrace();
}
}
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