c# barcode reader event What Are the Relationships Between Key Classes and Interfaces for Rowsets in Font

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7.2. What Are the Relationships Between Key Classes and Interfaces for Rowsets
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Figure 7-1 show the relationships between key classes and interfaces for rowsets. We can observe the following from Figure 7-1: RowSet is a foundation interface for all rowset objects (CachedRowSet, WebRowSet, etc.). RowSet extends ResultSet and RowSetMetaData extends ResultSetMetaData. Every rowset object has an internal object (called InternalRowSet) that enables reading and writing to data sources. The RowSet interface supports JavaBeans events (by using RowSetEvent), allowing other components in an application to be notified when an event (such as adding, deleting, or updating a row or record) occurs on a rowset, such as a change in its value. For details on the relationship of rowsets, refer to the online publication JDBC Specification 3.0, Final Release, by Jon Ellis, Linda Ho, and Maydene Fisher.
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CHAPTER 7 ROWSET METADATA
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Figure 7-1. RowSet relationships
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7.3. What Is a JdbcRowSet
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JdbcRowSet (javax.sql.JdbcRowSet interface) is a connected rowset that serves mainly as a thin wrapper around a ResultSet object to make a JDBC driver look like a JavaBeans component. According to J2SE 5.0 documentation, a JdbcRowSet object can be one of the Beans that a tool makes available for composing an application. Because a JdbcRowSet is a connected rowset, that is, it continually maintains its connection to a database using a JDBC technologyenabled driver, it also effectively makes the driver a JavaBeans component. JdbcRowSet is defined as follows: package javax.sql.rowset; import javax.sql.RowSet; import javax.sql.rowset.Joinable; public interface JdbcRowSet extends RowSet, Joinable { }
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CHAPTER 7 ROWSET METADATA
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Because JdbcRowSet is always connected to its database, an instance of JdbcRowSet can simply take calls invoked on it and in turn call them on its ResultSet object. As a consequence, a result set can, for example, be a component in a Swing application. Another advantage of a JdbcRowSet object is that it can be used to make a ResultSet object scrollable and updatable. All RowSet objects are by default scrollable and updatable. If the driver and database being used do not support scrolling or updating of result sets, an application can populate a JdbcRowSet object with the data of a ResultSet object and then operate on the JdbcRowSet object as if it were the ResultSet object. The following code fragment illustrates creating a JdbcRowSet object, setting its properties, and executing the command string in its command property: import java.sql.Connection; // import java.sql.rowset.JdbcRowSet; // import com.sun.rowset.JdbcRowSetImpl; // ... Connection conn = null; JdbcRowSet jrs = null; String query = "SELECT author, title FROM try { conn = getConnection(); jrs = new JdbcRowSetImpl(conn); jrs.setCommand(query); jrs.execute(); ... } catch(SQLException se) { // handle database exceptions } catch(Exception e) { // handle other exceptions } finally { // close resources } database connection object JdbcRowSet definition Sun's reference impl. of JdbcRowSet
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books";
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At this point, jrs contains all of the selected data in the books table. After creating a JdbcRowSet object, you may use ResultSet methods because it is effectively operating on a ResultSet object. It can navigate the rows in jrs, retrieve column values, update column values, insert new rows, and so on. For example, to process results, you may write the following to iterate all rows: while (jrs.next()) { System.out.println("author: " + jrs.getString(1)); System.out.println("title: " + jrs.getString(2)); } In this example, the next three lines of code go to the fifth row and retrieve the value in the first and second columns using ResultSet methods:
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CHAPTER 7 ROWSET METADATA
jrs.absolute(5); String author = jrs.getString(1); String title = jrs.getString(2); Once you create a JdbcRowSet object, then you can extract its metadata by using this code (note that the method getMetaData() is a ResultSet method that returns a ResultSetMetaData object, so it must be cast to a RowSetMetaData object before it can be assigned to rsMetaData): RowSetMetaData rsMetaData = (RowSetMetaData) jrs.getMetaData(); If (rsMetaData == null) { // vendor has not implemented the RowSetMetaData interface } else { // you can invoke RowSetMetaData methods to get JdbcRowSet's metadata int numberOfColumns = rsMetaData.getColumnCount(); } For rowset objects, you may pass input parameters (similar to PreparedStatement objects). The following code fragment shows what an application might do: it sets the rowset s command, sets the command s parameters, and executes the command. Simply by calling the execute method, jrs populates itself with the requested data from the table CUSTOMERS: Connection conn = getConnection(); JdbcRowSet jrs = new JdbcRowSetImpl(conn); jrs.setCommand("SELECT author, title FROM books where author = "); jrs.setString(1, "Knuth"); jrs.execute(); Sun s reference implementation class, com.sun.rowset.JdbcRowSetImpl, which is defined next, has four constructors. In order to understand the JdbcRowSetImpl class, we need to understand the BaseRowSet class the superclass for the JdbcRowSetImpl class.
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