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In a client/server environment, the network overhead involved in fetching many rows of query results can be very substantial. To cut this overhead, an ODBC driver may support multirow fetches through the ODBC block cursor capability. With a block cursor, each SQLFetch() or SQLFetchScroll() call retrieves multiple rows (termed the current rowset of the cursor) from the data source. The application must bind the returned columns to arrays to hold the multiple rows of fetched data. Either row-wise or columnwise binding of the rowset data is supported, using the same techniques as those used for parameter arrays. In addition, the SQLSetPos() function may be used to establish one of the rows of the rowset as the current row for positioned update and delete operations. ODBC bookmarks provide a different efficiency boost for an application program that needs to operate on retrieved rows of data. An ODBC bookmark is a databaseindependent unique row-id for SQL operations. (A driver may actually use primary keys or DBMS-specific row-ids or other methods to support bookmarks, but it is transparent to the application program.) When bookmarks are enabled, the bookmark (row-id) is returned for each row of query results. The bookmark can be used with scrolling cursors to return to a particular row. Additionally, it can be used to perform a positioned update or delete based on a bookmark. Bookmarks can also be used to determine if a particular row retrieved by two different queries is, in fact, the same row or two different rows with the same data values. Bookmarks can make some operations much more efficient (for example, performing positioned updates via a bookmark rather than respecifying a complex search condition to identify the row). However, there can be substantial overhead for some DBMS brands and ODBC drivers in maintaining the bookmark information, so this trade-off must be considered carefully. ODBC bookmarks form the basis for ODBC bulk operations, another efficiency-related feature. The SQLBulkOperations() call allows an application program to efficiently update, insert, delete or refetch multiple rows based on their bookmarks. It operates in conjunction with block cursors and works on the rows in the current rowset. The application program places the bookmarks for the rows to be affected into an array, and places into other arrays the values to be inserted or deleted. It then calls SQLBulkOperations() with a function code indicating whether the identified rows are to be updated, deleted, or refetched, or whether a set of new rows is to be added. This call completely bypasses the normal SQL statement syntax for these operations, and because it can operate on multiple rows in a single call, can be a very efficient mechanism for bulk insertion, deletion, or update of data.
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The most popular programmatic interface to Oracle is embedded SQL. However, Oracle also provides an alternative callable API, known as the Oracle Call Interface, or OCI. OCI has been available for many years and remained fairly stable through a number of major Oracle upgrade cycles, including all of the Oracle7 versions. With the introduction of Oracle8, OCI underwent a major revision, and many of the original OCI calls were replaced by new, improved versions. Moving forward with Oracle9 and beyond, this new OCI (the Oracle8 version) is effectively the Oracle Call Interface for new programs. The old OCI (from Oracle7 and before) is relevant only for legacy programs that were originally developed using it. For reference, the old OCI routines are summarized in Table 19-6, so that you can recognize a program that may be using this old version. Conceptually, the routines closely parallel the embedded dynamic SQL interface, described in 18. The new OCI uses many of the same concepts as the SQL/CLI standard and ODBC, including the use of handles to identify interface objects. Several hundred routines are defined in the API, and a complete description of them is beyond the scope of this book. The following sections identify the major routines that will be used by most application programs and their functions.
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