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 *  $RCSfile: DataAccessDescriptor.idl,v $
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 *  last change: $Author: rt $ $Date: 2005/09/08 03:14:08 $
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 *    GNU Lesser General Public License Version 2.1
 *    =============================================
 *    Copyright 2005 by Sun Microsystems, Inc.
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#ifndef __com_sun_star_sdb_DataAccessDescriptor_idl__
#define __com_sun_star_sdb_DataAccessDescriptor_idl__

#ifndef __com_sun_star_sdbc_Connection_idl__ 
#include <com/sun/star/sdbc/Connection.idl>
#endif

#ifndef __com_sun_star_sdbc_ResultSet_idl__ 
#include <com/sun/star/sdbc/ResultSet.idl>
#endif

#ifndef __com_sun_star_beans_XPropertySet_idl__ 
#include <com/sun/star/beans/XPropertySet.idl>
#endif

module com {  module sun {  module star {  module sdb {

/** descriptor for accessing basic data access objects.

	<p>Various components interacting with the database access world require to specify (or provide themself) an object
	such as a query, a table, a result set, a connection to a data source, a column within a table, and so on.</br>
	All of these objects are usually not specified with a single property, but with a set of properties, and for
	various objects, various (but not always different) properties are needed.<br/>
	The <type>DataAccessDescriptor</type> describes the super set of the properties for the most common
	data access objects.</p>

	<p>Every component providing or requiring a <type>DataAccessDescriptor</type> for some functionality
	is urged to specify which properties are mandatory, and which ones optional. Additionally,
	it's free to specify any additional requirements about the relations of properties.</p>

	@since OOo 1.1.2
*/
published service DataAccessDescriptor
{
	/** specifies the name of the datasource to access.

		<p>This data source is usually used to create a <type>Connection</type>. If no DataSourceName is given
		and the <member>DatabaseLocation</member> and the <member>ConnectionResource</member> are emtpy, then an <member>ActiveConnection</member> is reuqired.</p>

		@see com::sun::star::sdb::DatabaseContext
		@see ActiveConnection
	 */
	[optional, property] string DataSourceName;

	/** specifies the URL of the database file.

		<p>This database location is usually used to create a <type>Connection</type>. If no DatabaseLocation is given
		and the <member>ConnectionResource</member> is emtpy, then an <member>ActiveConnection</member> is reuqired.</p>

		@see com::sun::star::sdb::DatabaseContext
		@see ActiveConnection
	 */
	[optional, property] string DatabaseLocation;

	/** specifies the database URL which locates a database driver.

		<p>This database URL is usually used to create a <type>Connection</type>. If no ConnectionResource is given,
		then an <member>ActiveConnection</member> is reuqired.</p>

		@see com::sun::star::sdb::DatabaseContext
		@see ActiveConnection
	 */
	[optional, property] string ConnectionResource;

	/** is a connection to use.

		<p>This object is guaranteed to be a <type scope="com::sun::star::sdbc">Connection</type>, but usually
		it will be a <type>Connection</type> from the module com::sun::star::sdb.<br/>
		Especially in the case where no <member>DataSourceName</member> is given, but
		<member>CommandType</member> is <member>CommandType::QUERY</member>, the ActiveConnection needs
		to fully support the <type>Connection</type> service, to actually retrieve the query specified by
		<member>Command</member></p>

		<p>If no ActiveConnection is given, then a <member>DataSourceName</member> is required.</p>

		@see DataSourceName
	 */
	[optional, property] com::sun::star::sdbc::XConnection ActiveConnection;

	/** specifies the command to execute to retrieve a result set.

		<p>This property is only meaningfull together with the <member>CommandType</member>
		property, thus either <em>both</em> or <em>none</em> of them are present.</p>

		@see CommandType
	 */
	[optional, property] string Command;


	/** specifies the type of the command to be executed to retrieve a result set.

		<p><member>Command</member> needs to be interpreted depending on the value of this property.</p>

		<p>This property is only meaningfull together with the <member>Command</member>
		property, thus either <em>both</em> or <em>none</em> of them are present.</p>

		@see com::sun::star::sdb::CommandType
	 */
	[optional, property] long CommandType;

	/** specifies an addtional filter to optinally use.

		<p>The Filter string has to form a SQL WHERE-clause, <em>without</em> the WHERE-string itself.</p>

		<p>If a <member>DataSourceName</member>, <member>Command</member> and <member>CommandType</member>
		are specified, a <type>RowSet</type> can be created with this information. If the results provided by the
		row set are to be additionally filtered, the Filter property can be used.</p>

		<p>Note that the Filter property does not make sense if a <member>ResultSet</member> has been specified
		in the DataAccessDescriptor.</p>

		@see com::sun::star::sdb::RowSet
		@see ResultSet
	*/
	[optional, property] string Filter;

	/** specifies if the <member>Command</member> should be analyzed on the client side before sending it
		to the database server.

		<p>The default value of this property is <TRUE/>. By switching it to <FALSE/>, you can pass
		backend-specific SQL statements, which are not standard SQL, to your database.</p>

		<p>This property is usually present together with the <member>Command</member> and
		<member>CommandType</member> properties, and is evaluated if and only if <member>CommandType</member>
		equals <member>CommandType::COMMAND</member>.</p>
	*/
	[optional, property] boolean EscapeProcessing;

	/** specifies an already existent result set to use.

		<p>Usually, you use the properties <member>DataSourceName</member> (alternatively
		<member>ActiveConnection</member>), <member>Command</member> and <member>CommandType</member> to specify
		how to <em>obtain</em> a result set. However, in scenarious where the provider of a DataAccessDescriptor
		has access to an already existent result set, it can pass it along for reusage. This is encouraged
		to increase performance.</p>

		<p>The object will at least support the <type scope="com::sun::star::sdbc">ResultSet</type>.</p>

		<p>Note that any superservices of <type scope="com::sun::star::sdbc">ResultSet</type>
		are also allowed. Especially, this member can denote an instance of the
		<type scope="com::sun::star::sdb">RowSet</type>, or an instance obtained
		by calling <member scope="com::sun::star::sdb">XResultSetAccess::createResultSet</member>
		on such a <type scope="com::sun::star::sdb">RowSet</type>. This becomes important in
		conjunction with the <member>Selection</member> property.</p>

		@see com::sun::star::sdb::XResultSetAccess
	*/
    [optional, property] com::sun::star::sdbc::XResultSet ResultSet;

	/** specifies a selection to confine the records in a result set.

		<p>When you specify a result set either implicitly (<member>DataSourceName</member>, <member>Command</member>,
		<member>CommandType</member>) or explicitly (<member>ResultSet</member>), the set of results can be
		additionally refined with this property.</p>

		<p>The single elements of the <member>Selection</member> are either record numbers (see
		<member scope="com::sun::star::sdbc">XResultSet::getRow</member>), or bookmarks (see 
		<member scope="com::sun::star::sdbcx">XRowLocate::getBookmark</member>).<br/>
		It is up to the component which provides or requires a DataAccessDescriptor to specify which of the
		two alternatives it expects. If it does <em>not</em> specify this, then the property
		<member>BookmarkSelection</member> becomes mandatory.</p>

		<p>If the elements specify bookmarks, and a <member>ResultSet</member> has been specified, then
		this result set is urged to support the <type scope="com::sun::star::sdbcx">XRowLocate</type> interface.</p>
	*/
    [optional, property] sequence< any > Selection;

	/** specifies how to interpret <member>Selection</member>

		<p>If present, <member>BookmarkSelection</member> specifies the semantics of <member>Selection</member>. If
		not present, it's up to the implementing component to specify this semantics.</p>

		<p>If <TRUE/>, then the single elements of the array specified by <member>Selection</member> are
		bookmarks relative to the result set, if <FALSE/>, they're record numbers.</p>

		@see com::sun::star::sdbcx::XRowLocate
		@see com::sun::star::sdbc::XResultSet
		@see com::sun::star::sdb::XResultSetAccess
	*/
	[optional, property] boolean BookmarkSelection;

	/** specifies a column name.

		<p>This property is usually used together with the <member>Command</member> and
		<member>CommandType</member> properties.</p>

		@see Column
	*/
	[optional, property] string ColumnName;

	/** specifies a column object

		<p>For reasons of performance and saving resources, a supplier of an DataAccessDescriptor which is
		used to describe a column object can pass this object directly, instead of specifying it only implicitly
		with the <member>ColumnName</member> property.</p>

		<p>The object will at least support the <type scope="com::sun::star::sdbcx">Column</type> service, but more
		often it will even be a <type>Column</type> from the com::sun::star::sdb module.</p>
	*/
	[optional, property] com::sun::star::beans::XPropertySet Column;
};

}; }; }; };

#endif
