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STATIC Think of this as a snapshot of the result set A static cursor does not reflect any types of changes to the underlying database, such as INSERTs, UPDATEs, or DELETEs This is a read-only cursor that can go forward or backward FAST_FORWARD This will create a fast forward-only, read-only cursor As the name implies, the cursor can only go from the first row forward to the last row Unlike a STATIC cursor, rows are not retrieved from the database until they are fetched Any changes to a row (from INSERT, UPDATE or DELETE statements) before the row is fetched, will be reflected in the fetched row DYNAMIC All changes made to the underlying data via INSERT, UPDATE, or DELETE statements will be visible in the cursor By default, uncommitted data is not shown unless the transaction isolation level is set to read uncommitted KEYSET This creates a fixed order of rows in a keyset-driven cursor The keyset is built in the tempdb when the cursor is opened While the order of the rows can not change, any UPDATEs to the underlying data are reflected in the cursor INSERTs to the underlying data are not visible unless the cursor is closed and reopened If a row has been deleted the @@FETCH_STAUS will return a-2 for a row missing status

childprototype = new Proxy(); childprototypeconstructor = child; } }()); The downside of doing so is that while the default constructor member would not be enumerated in a for in loop, the one you add by hand would be enumerated For this reason, you may want to forgo adding a constructor member, but I have added it here so you can say you ve seen one in action Note that JavaScript does not need the constructor member for the prototype chain, instanceof operator, or any feature to work A common practice is to add a static member to child (not to childprototype) referring to parentprototype Doing so provides a way to query a type s parent (known as its superclass) That s not something you ll do as a beginner.

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EXAM TIP When preparing for the 70-442 test, make sure you know the four different cursor types, their capabilities, and when to use each of them Static and Fast_forward cursors are read-only cursors; static can move forward and backward while fast_forward moves forward only The Dynamic cursor will reflect all changes Keyset is updateable, but also maintains a fixed order of rows in the tempdb database The Local and Global arguments identify the scope of the cursor Local specifies the cursor as only available within the batch, stored procedure, or trigger where it is created Global specifies that the cursor is available to any batch or stored procedure executed in the same connection Forward_only and Scroll arguments are used to identify the FETCH options available Forward_only allows FETCH NEXT only and allows the cursor to scroll from the first to the last row only Static and Scroll allows any FETCH option (First, Last, Prior, Next, Relative, and Absolute) The read_only, Scroll_locks, and Optimistic options are used to specify options related to updates Read_only prevents updates made through the cursor Scroll_locks locks rows as they are read into the cursor so that UPDATEs and DELETEs are guaranteed to succeed Optimistic does not lock the rows, but instead operates on the premise that it is optimistic that UPDATEs and DELETEs will succeed without a lock If the row was updated or deleted since the row was read into the cursor, then any UPDATE or DELETE through the cursor will fail

Building a cursor generally is accomplished in five steps 1 Declare variables or each column in the cursor 2 Declare the cursor and associate it with a SELECT statement This is where you would also define the type of the cursor, such as read-only or forward-only if desired 3 Use the OPEN statement to populate the cursor from the SELECT statement 4 Use the FETCH statement to fetch individual rows and populate the columns of the cursor 5 Clean up by using the CLOSE and DEALLOCATE statements to close the cursor and free resources associated with the cursor The following code shows these steps:

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