_SelectColumnCharacteristics


1   package com.daffodilwoods.daffodildb.server.sql99.dql.resultsetmetadata;
2   
3   import com.daffodilwoods.daffodildb.server.datadictionarysystem._ColumnCharacteristics;
4   import com.daffodilwoods.database.resource.*;
5   import java.io.Serializable  ;
6   import com.daffodilwoods.daffodildb.server.sql99.common.ColumnDetails;
7   
8   /**
9    * It represents the columncharacteristics of selected columns present in select
10   * query.
11   * <p>Title: </p>
12   * <p>Description: </p>
13   * <p>Copyright: Copyright (c) 2003</p>
14   * <p>Company: </p>
15   * @author unascribed
16   * @version 1.0
17   */
18  
19  public interface _SelectColumnCharacteristics extends _ColumnCharacteristics,Serializable   {
20  
21     /**
22      * It is used to check whether column at passed index is updatable or not. it
23      * is required to check whether user can perform updation on that column or
24      * not.
25      * @param columnIndex
26      * @return
27      * @throws DException
28      */
29  
30     boolean isColumnUpdatable(int columnIndex) throws DException;
31  
32     /**
33      * It is used to check whether the whole row of select query is updatable
34      * or not. If all the columns are not updatable then the select query is not
35      * updatable.
36      * @return
37      * @throws DException
38      */
39  
40     boolean isUpdatable() throws DException;
41  
42     /**
43      * It allows user to check whether column is selected or not. It is needed
44      * in listener work.
45      * @param columnIndex
46      * @return
47      * @throws DException
48      */
49  
50     boolean isColumnSelectable(int columnIndex) throws DException;
51  
52     /**
53      * Return the columncharacteristics of actual table refered in chained
54      * column.
55      * @param index
56      * @return
57      * @throws DException
58      */
59  
60     _SelectColumnCharacteristics getColumnCharacteristics(int index) throws DException;
61  
62     /**
63      * Used to check whether the column at the passed index is chained column or
64      * not.
65      * @param index
66      * @return
67      * @throws DException
68      */
69  
70     boolean isForeignTableRecordFetched(int index) throws DException;
71  
72     /**
73      * This method is used to obtain the expression(if any) for any particular
74      * column representing by passed index.
75      * @param index
76      * @return
77      * @throws DException
78      */
79  
80     String   getExpression( int index ) throws DException;
81  
82     /**
83      * This method is required to obtain all underlying columns of passed column
84      * without performing semantic checking. It is required in case of view or
85      * 'from subquery'.
86      * @param column
87      * @return
88      * @throws DException
89      */
90  
91     Object  [] getCorresspondingColumnsForFromSubQueryColumn(Object   column) throws DException;
92  }
93
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