|
1
5 package org.h2.command.dml;
6
7 import java.sql.SQLException  ;
8
9 import org.h2.command.Prepared;
10 import org.h2.engine.Session;
11 import org.h2.expression.ExpressionColumn;
12 import org.h2.result.LocalResult;
13 import org.h2.table.Column;
14 import org.h2.util.ObjectArray;
15 import org.h2.value.Value;
16 import org.h2.value.ValueString;
17
18 public class ExplainPlan extends Prepared {
19
20 private Prepared command;
21 private LocalResult result;
22
23 public ExplainPlan(Session session) {
24 super(session);
25 }
26
27 public void setCommand(Prepared command) {
28 this.command = command;
29 }
30
31 public void prepare() throws SQLException {
32 command.prepare();
33 }
34
35 public LocalResult query(int maxrows) throws SQLException {
36 ObjectArray expressions = new ObjectArray();
38 Column column = new Column("PLAN", Value.STRING, 0, 0);
39 ExpressionColumn expr = new ExpressionColumn(session.getDatabase(), null, column);
40 expressions.add(expr);
41 result = new LocalResult(session, expressions, 1);
42 String plan = command.getPlan();
43 add(plan);
44 result.done();
45 return result;
46 }
47
48 private void add(String text) throws SQLException {
49 Value[] row = new Value[1];
50 Value value = ValueString.get(text);
51 row[0] = value;
52 result.addRow(row);
53 }
54
55 public boolean isQuery() {
56 return true;
57 }
58
59 public boolean isTransactional() {
60 return true;
61 }
62
63 public boolean isReadOnly() {
64 return true;
65 }
66 }
67 |
Popular Tags |
Java API By Example, From Geeks To Geeks.