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21 package org.apache.hadoop.hbase.hbql.statement;
22
23 import org.apache.hadoop.hbase.client.HBaseAdmin;
24 import org.apache.hadoop.hbase.hbql.client.ExecutionResults;
25 import org.apache.hadoop.hbase.hbql.client.HBqlException;
26 import org.apache.hadoop.hbase.hbql.impl.HConnectionImpl;
27
28 import java.util.List;
29
30 public class AlterTableStatement extends GenericStatement implements ConnectionStatement {
31
32 private final String tableName;
33 private final List<AlterTableAction> alterTableActionList;
34
35 public AlterTableStatement(final StatementPredicate predicate,
36 final String tableName,
37 final List<AlterTableAction> alterTableActionList) {
38 super(predicate);
39 this.tableName = tableName;
40 this.alterTableActionList = alterTableActionList;
41 }
42
43 private String getTableName() {
44 return this.tableName;
45 }
46
47 protected ExecutionResults execute(final HConnectionImpl conn) throws HBqlException {
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49 conn.validateTableDisabled(this.getTableName(), "alter");
50
51 final HBaseAdmin admin = conn.getHBaseAdmin();
52
53 for (final AlterTableAction alterTableAction : this.alterTableActionList)
54 alterTableAction.execute(conn, admin, this.getTableName());
55
56 return new ExecutionResults("Table " + this.getTableName() + " altered.");
57 }
58
59 public static String usage() {
60 return "ALTER TABLE table_name alter_action_list [IF bool_expr]";
61 }
62 }