offapi/com/sun/star/form/component/DatabaseListBox.idl

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  19
  20
  21
  22  module com {  module sun {  module star {  module form {  module component {
  23
  24
  25 /** This service specifies a data-aware list box control model.
  26
  27     <p>The base service for list boxes (ListBox) offers only
  28     one possibility to specify the list entries:
  29     The display strings in the
  30     com::sun::star::awt::UnoControlListBoxModel::StringItemList
  31     property and the corresponding values in the ListBox::ListSource
  32     property.</p>
  33
  34     <p>This service here extends this mimic. It allows to fill the list from a data source.
  35     This means that a second result set is opened, which works on the same connection as the
  36     form which the list box belongs to, but can be based on an arbitrary table or SQL statement.</p>
  37
  38     <p>For instance, you may have a form which is bound to a table <em>invoice</em>, and you use it
  39     to enter invoices for your customers. Probably, you will have a second table (say <em>customer</em>),
  40     which (among other data) contains a unique key for identifying customers. In your invoice table, you will
  41     have a foreign key referring to these customers.<br/>
  42     Now, besides the result set the form is based on (all your invoices), the list box can be instructed
  43     to open a second result set, this time for the <em>customer</em> table, and fill its list with entries
  44     from this result set.<br/>
  45     Additionally, it allows to model the relation between the two tables: When the user selects a customer from
  46     the list, this customer has the unique id we just talked about (which is not necessarily visible to the
  47     user in any way). The list box then automatically transfers this id into the foreign key column of
  48     <em>invoice</em>, thus allowing the user to transparently work with human-readable strings instead of
  49     pure numbers.<br/>
  50     Let's call this result set the list is filled from the <em>list result set</em> here ...</p>
  51
  52     <p>The display strings are always taken from the first column of that result set,
  53     and the corresponding value as per the BoundColumn property.</p>
  54  */
  55 published service DatabaseListBox
  56 {
  57     service com::sun::star::form::component::ListBox;
  58
  59     service com::sun::star::form::DataAwareControlModel;
  60
  61
  62     /** specifies which column of the list result set should be used for data exchange.
  63
  64         <p>When you make a selection from a list box, the "BoundColumn"
  65         property reflects which column value of a result set should
  66         be used as the value of the component. If the control is bound
  67         to a database field, the column value is stored in the
  68         database field identified by the property
  69         com::sun::star::form::DataAwareControlModel::DataField.
  70
  71         <dl>
  72             <dt>-1</dt>
  73             <dd>The index (starting at 0) of the selected list box entry
  74             is stored in the current database field.</dd>
  75
  76             <dt>0 or greater</dt>
  77             <dd>The column value of the result set at the position
  78             (0-indexed) is stored in the current database field.
  79             In particular, for value 0, the selected (displayed)
  80             list box string is stored.</dd>
  81         </dl></p>
  82
  83         <p>The bound column property is only used if a list source is defined
  84         and the list source matches with the types
  85         com::sun::star::form::ListSourceType::TABLE,
  86         com::sun::star::form::ListSourceType::QUERY,
  87         com::sun::star::form::ListSourceType::SQL or
  88         com::sun::star::form::ListSourceType::SQLPASSTHROUGH.
  89         Otherwise the property is ignored, as there is no result set from which to
  90         get the column values.</p>
  91     */
  92     [property] short BoundColumn;
  93
  94
  95     /** describes the kind of list source used.
  96
  97         <p>Depending on the value of this property, the way the value of ListBox::ListSource
  98         is evaluated varies.
  99             <dl>
 100                 <dt>com::sun::star::form::ListSourceType::VALUELIST</dt>
 101                 <dd>The elements in the string sequence in ListBox::ListSource
 102                 build up the entry list.</dd>
 103
 104                 <dt>com::sun::star::form::ListSourceType::TABLE</dt>
 105                 <dd>The first element of the string sequence in ListBox::ListSource
 106                 determines the table which the list result set should be based on.</dd>
 107
 108                 <dt>com::sun::star::form::ListSourceType::QUERY</dt>
 109                 <dd>The first element of the string sequence in ListBox::ListSource
 110                 determines the query which the list result set should be based on.<br/>
 111                 For retrieving the query, the connection which the data form is working with
 112                 (com::sun::star::sdb::RowSet::ActiveConnection) is queried for
 113                 the com::sun::star::sdb::XQueriesSupplier interface.</dd>
 114
 115                 <dt>com::sun::star::form::ListSourceType::SQL</dt>
 116                 <dd>The first element of the string sequence in ListBox::ListSource
 117                 contains the SQL statement which the list result set should be based on.</p>
 118
 119                 <dt>com::sun::star::form::ListSourceType::SQLPASSTHROUGH</dt>
 120                 <dd>The first element of the string sequence in ListBox::ListSource
 121                 contains the SQL statement which the list result set should be based on.<br/>
 122                 The statement is not analyzed by the parser. This means that you can use database specific
 123                 SQL features here, but, on the other hand, lose features like parameter value substitution.</dd>
 124
 125                 <dt>com::sun::star::form::ListSourceType::TABLEFIELDS</dt>
 126                 <dd>The first element of the string sequence in ListBox::ListSource
 127                 determines the table whose column names should fill the list.</dd>
 128             </dl>
 129         </p>
 130
 131      */
 132     [property] com::sun::star::form::ListSourceType ListSourceType;
 133
 134     /** The selected values.
 135      */
 136     [property, transient, optional] sequence< any > SelectedValues;
 137
 138     /** The selected value, if there is at most one.
 139      */
 140     [property, transient, optional] any SelectedValue;
 141
 142 };
 143
 144
 145 }; }; }; }; };
 146
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