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1
5 package org.h2.expression;
6
7 import java.sql.SQLException  ;
8
9 import org.h2.engine.Session;
10 import org.h2.table.ColumnResolver;
11 import org.h2.table.TableFilter;
12 import org.h2.value.Value;
13
14
15
18
19 public class Alias extends Expression {
20
21 private Expression expr;
22 private String alias;
23
24 public Alias(Expression expression, String alias) {
25 this.expr = expression;
26 this.alias = alias;
27 }
28
29 public Expression getNonAliasExpression() {
30 return expr;
31 }
32
33 public Value getValue(Session session) throws SQLException {
34 return expr.getValue(session);
35 }
36
37 public int getType() {
38 return expr.getType();
39 }
40
41 public void mapColumns(ColumnResolver resolver, int level) throws SQLException {
42 expr.mapColumns(resolver, level);
43 }
44
45 public Expression optimize(Session session) throws SQLException {
46 expr = expr.optimize(session);
47 return this;
48 }
49
50 public void setEvaluatable(TableFilter tableFilter, boolean b) {
51 expr.setEvaluatable(tableFilter, b);
52 }
53
54 public int getScale() {
55 return expr.getScale();
56 }
57
58 public long getPrecision() {
59 return expr.getPrecision();
60 }
61
62 public boolean isAutoIncrement() {
63 return expr.isAutoIncrement();
64 }
65
66 public String getSQL() {
67 return expr.getSQL() + " AS " + alias;
68 }
69
70 public void updateAggregate(Session session) throws SQLException {
71 expr.updateAggregate(session);
72 }
73
74 public String getAlias() {
75 return alias;
76 }
77
78 public int getNullable() {
79 return expr.getNullable();
80 }
81
82 public boolean isEverything(ExpressionVisitor visitor) {
83 return expr.isEverything(visitor);
84 }
85
86 public int getCost() {
87 return expr.getCost();
88 }
89
90 }
91 |
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