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The COMMIT and ROLLBACK functions for SQL transaction processing also apply to SQL operation via the CLI. However, because the CLI itself must be aware that a transaction is being completed, the COMMIT and ROLLBACK SQL statements are replaced by the CLI SQLEndTran() call, shown in Figure 19-16. This call was used to commit the transactions in the program examples of Figures 19-11 and 19-15. The same CLI routine is used to execute either a COMMIT or a ROLLBACK operation; the particular operation to be performed is specified by the completion type parameter to the call. The CLI SQLCancel() call, also shown in Figure 19-16, does not actually provide a transaction management function, but in practice, it is almost always used in conjunction with a ROLLBACK operation. It is used to cancel the execution of a SQL statement that was previously initiated by a SQLExecDirect() or SQLExecute() call. This would be appropriate in a program that is using deferred parameter processing, as described in the previous section. If the program determines that it should cancel the statement execution instead of supplying a value for a deferred parameter, the program can call SQLCancel() to achieve this result.
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/* COMMIT or ROLLBACK a SQL transaction */ short SQLEndTran ( short hdltype, /* IN: type of handle */ long txnHdl, /* IN: env, conn or stmt handle */ short compltype) /* IN: txn typ (COMMIT/ROLLBACK) */ /* Cancel a currently-executing SQL statement */ short SQLCancel ( short stmtHdl) /* IN: statement handle */
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The SQLCancel() call can also be used in a multithreaded application to cancel the effect of a SQLExecute() or SQLExecDirect() call that has not yet completed. In this situation, the thread making the original execute call will still be waiting for the call to complete, but another concurrently executing thread may call SQLCancel() using the same statement handle. The specifics of this technique, and how interruptible a CLI call is, tend to be very implementation dependent.
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The CLI routines described thus far can be used to process SQL data definition statements or SQL data manipulation statements other than queries (that is, UPDATE, DELETE, and INSERT statements). For query processing, some additional CLI calls, shown in Figure 19-17, are required. The simplest way to process query results is with the SQLBindCol()and SQLFetch() calls. To carry out a query using these calls, the application program goes through the following steps (assuming a connection has already been established): 1. The program allocates a statement handle using SQLAllocHandle(). 2. The program calls SQLPrepare(), passing the text of the SQL SELECT statement for the query. 3. The program calls SQLExecute() to carry out the query. 4. The program calls SQLBindCol() once for each column of query results that will be returned. Each call associates a program buffer area with a returned data column. 5. The program calls SQLFetch() to fetch a row of query results. The data value for each row in the newly fetched row is placed into the appropriate program buffer as indicated in the previous SQLBindCol() calls.
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6. If the query produces multiple rows, the program repeats Step 5 until the SQLFetch() call returns a value indicating that there are no more rows. 7. When all query results have been processed, the program calls SQLCloseCursor() to end access to the query results.
/* Bind a query results column to a program data area */ short SQLBindCol ( long stmtHdl, /* IN: statement handle */ short colnr, /* IN: column number to be bound */ short tgttype, /* IN: data type of program data area */ void value, /* IN: ptr to program data area */ long buflen, /* IN: length of program buffer */ long lenind) /* IN: ptr to length/indicator buffer */ /* Advance the cursor to the next row of query results */ short SQLFetch ( long stmtHdl) /* IN: statement handle */
/* Scroll the cursor up or down through the query results */ short SQLFetchScroll ( long stmtHdl, /* IN: statement handle */ short fetchdir, /* IN: direction (first/next/prev) */ long offset) /* IN: offset (number of rows) */ /* Get the data for a single column of query results */ short SQLGetData ( long stmtHdl, short colnr, short tgttype, void *value, long buflen, long *lenind) /* /* /* /* /* /* IN: IN: IN: IN: IN: OUT: statement handle */ column number to be retrieved */ data type to return to program */ ptr to buffer for column data */ length of program buffer */ actual length and/or NULL ind */
/* Close a cursor to end access to query results */ short SQLCloseCursor ( long stmtHdl) /* IN: statement handle */
Figure 19-17.
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