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+---
+title: Architecture
+order: 1
+layout: page
+---
+
+[[sqlcontainer.architecture]]
+= Architecture
+
+The architecture of SQLContainer is relatively simple. [classname]#SQLContainer#
+is the class implementing the Vaadin [classname]#Container# interfaces and
+providing access to most of the functionality of this add-on. The standard
+Vaadin [classname]#Property# and [classname]#Item# interfaces have been
+implementd as the [classname]#ColumnProperty# and [classname]#RowItem# classes.
+Item IDs are represented by [classname]#RowId# and [classname]#TemporaryRowId#
+classes. The [classname]#RowId# class is built based on the primary key columns
+of the connected database table or query result.
+
+In the [package]#connection# package, the [classname]#JDBCConnectionPool#
+interface defines the requirements for a connection pool implementation. Two
+implementations of this interface are provided:
+[classname]#SimpleJDBCConnectionPool# provides a simple yet very usable
+implementation to pool and access JDBC connections.
+[classname]#J2EEConnectionPool# provides means to access J2EE DataSources.
+
+The [package]#query# package contains the [classname]#QueryDelegate# interface,
+which defines everything the SQLContainer needs to enable reading and writing
+data to and from a database. As discussed earlier, two implementations of this
+interface are provided: [classname]#TableQuery# for automatic read-write support
+for a database table, and [classname]#FreeformQuery# for customizing the query,
+sorting, filtering and writing; this is done by implementing relevant methods of
+the [classname]#FreeformStatementDelegate# interface.
+
+The [package]#query# package also contains [classname]#Filter# and
+[classname]#OrderBy# classes which have been written to provide an alternative
+to the standard Vaadin container filtering and make sorting non-String
+properties a bit more user friendly.
+
+Finally, the [package]#generator# package contains a [classname]#SQLGenerator#
+interface, which defines the kind of queries that are required by the
+[classname]#TableQuery# class. The provided implementations include support for
+HSQLDB, MySQL, PostgreSQL ( [classname]#DefaultSQLGenerator#), Oracle (
+[classname]#OracleGenerator#) and Microsoft SQL Server (
+[classname]#MSSQLGenerator#). A new or modified implementations may be provided
+to gain compatibility with older versions or other database servers.
+
+For further details, please refer to the SQLContainer API documentation.
+
+
+