Modifiable Result Sets
Another feature of SDBC is the ability to update rows in a result set using methods in the programming language, rather than sending an SQL command. Before doing this, a modifiable result set must be created. To create a modifiable result set, supply the ResultSetConcurrency constant UPDATABLE to the Statement property ResultSetConcurrency, so that the Statement object creates an modifiable ResultSet object each time it executes a query.
The following code fragment creates a modifiable XResultSet object rs. Note that the code also makes rs scrollable. A modifiable ResultSet object does not have to be scrollable, but when changes are made to a result set, the user may want to move around in it. With a scrollable result set, there is the ability to move to particular rows that you can work with. If the type is SCROLL_SENSITIVE, the new value in a row can be obtained after it has changed without refreshing the whole result set.
XStatement stmt = con.createStatement();
XPropertySet xProp = (XPropertySet)UnoRuntime.queryInterface(XPropertySet.class, stmt);
xProp.setPropertyValue("ResultSetType", new java.lang.Integer(ResultSetType.SCROLL_INSENSITIVE));
xProp.setPropertyValue("ResultSetConcurrency", new java.lang.Integer(ResultSetConcurrency.UPDATABLE));
XResultSet rs = stmt.executeQuery("SELECT NAME, PRICE FROM SALES");
XRow row = (XRow)UnoRuntime.queryInterface(XRow.class, rs);
The ResultSet object rs may look similar to this:
| NAME | PRICE |
|---|---|
| Linux | $30.00 |
| Beef | $15.78 |
| Orange juice | $1.50 |
The methods can now be used in the com.sun.star.sdbc.XRowUpdate interface of the result set to insert a new row into rs, delete an existing row from rs, or modify a column value in rs.
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