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new HTable(conf, tableName);
Get get = new Get(Bytes.toBytes(row));
Result result = table.get(get);
// 输出结果,raw方法返回所有keyvalue数组
for (KeyValue rowKV : result.raw()) {
System.out.print("行名:" + new String(rowKV.getRow()) + " ");
System.out.print("时间戳:" + rowKV.getTimestamp() + " ");
System.out.print("列族名:" + new String(rowKV.getFamily()) + " ");
System.out.print("列名:" + new String(rowKV.getQualifier()) + " ");
System.out.println("值:" + new String(rowKV.getValue()));
}
}
// 获取所有数据
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) {
for (KeyValue rowKV : result.raw()) {
System.out.print("行名:" + new String(rowKV.getRow()) + " ");
System.out.print("时间戳:" + rowKV.getTimestamp() + " ");
System.out.print("列族名:" + new String(rowKV.getFamily()) + " ");
System.out
.print("列名:" + new String(rowKV.getQualifier()) + " ");
System.out.println("值:" + new String(rowKV.getValue()));
}
}
}
// 主函数
public static void main(String[] args) {
try {
String tableName = "student";
// 第一步：创建数据库表：“student”
String[] columnFamilys = { "info", "course" };
HBaseJavaAPI.createTable(tableName, columnFamilys);
// 第二步：向数据表的添加数据
// 添加第一行数据
if (isExist(tableName)) {
HBaseJavaAPI.addRow(tableName, "zpc", "info", "age", "20");
HBaseJavaAPI.addRow(tableName, "zpc", "info", "sex", "boy");
HBaseJavaAPI.addRow(tableName, "zpc", "course", "china", "97");
HBaseJavaAPI.addRow(tableName, "zpc", "course", "math", "128");
HBaseJavaAPI.addRow(tableName, "zpc", "course", "english", "85");
// 添加第二行数据
HBaseJavaAPI.addRow(tableName, "henjun", "info", "age", "19");
HBaseJavaAPI.addRow(tableName, "henjun", "info", "sex", "boy");
HBaseJavaAPI.addRow(tableName, "henjun", "course", "china","90");
HBaseJavaAPI.addRow(tableName, "henjun", "course", "math","120");
HBaseJavaAPI.addRow(tableName, "henjun", "course", "english","90");
// 添加第三行数据
HBaseJavaAPI.addRow(tableName, "niaopeng", "info", "age", "18");
HBaseJavaAPI.addRow(tableName, "niaopeng", "info", "sex","girl");
HBaseJavaAPI.addRow(tableName, "niaopeng", "course", "china","100");
HBaseJavaAPI.addRow(tableName, "niaopeng", "course", "math","100");
HBaseJavaAPI.addRow(tableName, "niaopeng", "course", "english","99");
// 第三步：获取一条数据
System.out.println("**************获取一条(zpc)数据*************");
HBaseJavaAPI.getRow(tableName, "zpc");
// 第四步：获取所有数据
System.out.println("**************获取所有数据***************");
HBaseJavaAPI.getAllRows(tableName);
// 第五步：删除一条数据
System.out.println("************删除一条(zpc)数据************");
HBaseJavaAPI.delRow(tableName, "zpc");
HBaseJavaAPI.getAllRows(tableName);
// 第六步：删除多条数据
System.out.println("**************删除多条数据***************");
String rows[] = new String[] { "qingqing","xiaoxue" };
HBaseJavaAPI.delMultiRows(tableName, rows);
HBaseJavaAPI.getAllRows(tableName);
// 第七步：删除数据库
System.out.println("***************删除数据库表***** |