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CREATE TABLE T ( int1 int, bit1 bit NOT NULL DEFAULT 0, varchar1 varchar(3), dec1 dec(5,2), cmp1 AS (int1 + bit1) ) The script in NullToZero.sql includes the same four INSERT statements and the first SELECT statement from Ch04InsertWithMissingValues.sql. When you run these statements after the preceding CREATE TABLE statement, the following listing appears. All four rows appear in the output from the SELECT statement. The DEFAULT 0 constraint for the bit1 column in the CREATE TABLE statement assigns a value of 0 to rows with a missing value namely, the second and third rows. The NOT NULL constraint is not strictly necessary because the DEFAULT constraint overrides it, but the inclusion of the NOT NULL phrase does not cause a compilation error.

If you have prior experience with earlier versions of SQL Server, you may be familiar with severity levels for errors. Error levels are reported after one or more batches of T-SQL statements run; the error level numbers tell you that something went wrong and how severe it is after the T-SQL code runs. The SSE query tool based on SQL Server Management Studio introduces the notion of a compilation error for T-SQL code. A compilation error is detected by the SSE query tool before batch statements run. The query tool marks lines with syntax or semantic errors. As noted, the NOT NULL and DEFAULT 0 column properties for constraining bit1 column values do not conflict with one another. However, replacing NOT NULL with NULL in the Ch04InsertWithMissingValues.sql file generates a compilation error because a column cannot have a default value of zero and allow null values. If you change NOT NULL to NULL, the SSE query tool marks the changed line.

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You re getting the idea. By then clicking the various line options surrounding the Text image you can border the selected cells; and while this option doesn t offer much more than what you re getting in the other border-drawing options, you do have those diagonals. If I click a diagonal, I ll see, by way of preview (Figure 4 27):

bit1 ----0 0 0 1

It is often desirable to track the user, date, and time associated with changes to the rows in a database. The following demonstration from WhoWhenDefaults.sql tracks who made the last change to a row and when the user either inserted or modified the row. The DEFAULT property used along with the USER and CURRENT_TIMESTAMP SQL-92 niladic functions can help you store this kind of information in a table. The demonstration also contrasts the datetime return value from the CURRENT_TIMESTAMP function with a timestamp data type value. Recall that the timestamp data type adds a binary(8) number to a row rather than datetime data type.

The onFailure method of your AsyncCallback object references a small helper method to display any error returned from the server. Add this method to your class along with some required import statements. import com.google.gwt.event.dom.client.ChangeEvent; import com.google.gwt.event.dom.client.ChangeHandler; import java.util.Vector; private void handleError(Throwable error) { Window.alert(error.getMessage()); if (error instanceof NotLoggedInException) Window.Location.replace(loginInfo.getLogoutUrl()); } Your time-entry UI is almost complete. Users can now add rows to their timecards, select projects and milestones, and enter their time for the appropriate days. Your last major task for entering time is writing the entries to the datastore. To perform this function you ll add the code in Listing 7-12. The saveEntries method gathers up all of the user-entered timecard data rows into a Vector of TimeEntryData objects. If there are any timecard entries to submit to the server, the Vector of objects is passed to the server, the entries are persisted to the datastore, and the results are sent back and displayed to the user in a standard JavaScript Alert window. Listing 7-12. Code for the saveEntries method private void saveEntries() { Vector<TimeEntryData> entries = new Vector<TimeEntryData>(); for (int row=1;row<flexEntryTable.getRowCount();row++) { ListBox projectWidget = (ListBox) flexEntryTable.getWidget(row, 0); ListBox milestoneWidget = (ListBox) flexEntryTable.getWidget(row, 1); CheckBox billableWidget = (CheckBox) flexEntryTable.getWidget(row, 2);

Figure 4 27. A new angle on borders Click OK and you get this effect (Figure 4 28):

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