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JavaSercer Pages public int getInt( ) { return value; } public String getString( ) { return String.valueOf(value); } } An application that uses the SQLCommandBean can create Value objects and set the bean’s properties like this: SQLCommandBean sqlBean = new SQLCommandBean( ); sqlBean.setConnection(ds.getConnection( )); String sqlValue = “SELECT * FROM MyTable WHERE IntCol = ? AND TextCol = ?”; sqlBean.setSqlValue(sqlValue); Vector values = new Vector( ); values.addElement(new IntValue(10)); values.addElement(new StringValue(”Hello!”)); sqlBean.setValues(values); One of two methods in the SQLCommandBean is used to execute the SQL statement: the executeQuery( ) method for a SELECT statement, and the executeUpdate( ) method for all other types of statements. Example 17.6 shows the executeQuery( ) method. Example 17.6. The SQLCommandBean’s executeQuery( ) Method public Vector executeQuery( ) throws SQLException, UnsupportedTypeException { Vector rows = null; ResultSet rs = null; PreparedStatement pstmt = null; Statement stmt = null; try { if (values != null && values.size( ) > 0) { // Use a PreparedStatement and set all values pstmt = conn.prepareStatement(sqlValue); setValues(pstmt, values); rs = pstmt.executeQuery( ); } else { // Use a regular Statement stmt = conn.createStatement( ); rs = stmt.executeQuery(sqlValue); } // Save the result in a Vector of Row object rows = toVector(rs); } finally { try { if (rs != null) { rs.close( ); } if (stmt != null) { stmt.close( ); } if (pstmt != null) { pstmt.close( ); } } catch (SQLException e) { // Ignore. Probably caused by a previous // SQLException thrown by the outer try block } } return rows; } If the values property is set, a JDBC PreparedStatement is needed to associate the values with the question mark placeholders in the SQL statement. A method named setValues( ) takes care of setting all values, using the appropriate JDBC method for the datatype represented by each Value object. If the values property is not set, a regular JDBC Statement is created instead. In both cases, the JDBC driver is asked to execute the statement, and the resulting ResultSet is turned into a Vector with Row objects by the toVector( ) method. The Vector is then returned to the caller. You may wonder why the ResultSet is not returned directly instead of creating a Vector with Row objects. The reason is that a ResultSet is tied to the Connection that was used to generate it. When the Connection is closed or used to execute a new SQL statement, all open ResultSet objects for the Connection are released. You must therefore make sure to save the information from the ResultSet in a new data structure before reusing the Connection or returning it to the pool. page 244

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