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/* Set frequently used info in a CLI descriptor */ short SQLSetDescRec ( long descHdl, /* IN: descriptor handle */ short recnr, /* IN: descriptor record number */ short datatype, /* IN: data type code for item */ short subtype, /* IN: data type subcode for item */ short length, /* IN: length of item */ short precis, /* IN: precision of item, if numeric */ short scale, /* IN: scale of item, if numeric */ void *databuf, /* IN: data buffer address for item */ short buflen, /* IN: data buffer length */ short *indbuf) /* IN: indicator buffer addr for item */ /* Get detailed info about an item described by a CLI descriptor */ short SQLGetDescField ( long descHdl, /* IN: descriptor handle */ short recnr, /* IN: descriptor record number */ short attrcode, /* IN: code of attribute to describe */ void *attrinfo, /* IN: buffer for attribute info */ short buflen, /* IN: length of attribute info */ short *actlen) /* OUT: actual length of returned info */ /* Set value of an item described by a short SQLSetDescField ( long descHdl, /* IN: short recnr, /* IN: short attrcode, /* IN: void *attrinfo, /* IN: short buflen) /* IN: CLI descriptor */ descriptor handle */ descriptor record number */ code of attribute to describe */ buffer with attribute value */ length of attribute info */
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/* Copy a CLI descriptor contents into another descriptor */ short SQLCopyDesc ( long indscHdl, /* IN: source descriptor handle */ long outdscHdl) /* IN: destination descriptor handle */
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dynamic embedded SQL in 18. Here are the steps for dynamic query processing using CLI: 1. The program allocates a statement handle using SQLAllocHandle(). 2. The program calls Prepare(), 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 SQLNumResultCols() to determine the number of columns of query results. 5. The program calls SQLDescribeCol() once for each column of returned query results to determine its data type, size, whether it may contain NULL values, and so on. 6. The program allocates memory to receive the returned query results and binds these memory locations to the columns by calling SQLBindCol() once for each column. 7. The program calls SQLFetch() to fetch a row of query results. The SQLFetch() call advances the cursor to the next row of query results and returns each column of results into the appropriate area in the application program, as specified in the SQLBindCol() calls. 8. If the query produces multiple rows, the program repeats Step 7 until the SQLFetch() call returns a value indicating that there are no more rows. 9. When all query results have been processed, the program calls SQLCloseCursor() to end access to the query results. Figure 19-20 shows a program that uses these techniques to process a dynamic query. The program is identical in its concept and purpose to the embedded dynamic SQL query program shown in Figure 18-9 and the dblib-based dynamic SQL query program shown in Figure 19-10. Once again, it s instructive to compare the program examples to enhance your understanding of dynamic query processing. The API calls have quite different names, but the sequence of functions calls for the dblib program (Figure 19-10) and the CLI program (Figure 19-20) are nearly identical. The dbcmd() / dbsqlexec() / dbresults() call sequence is replaced by SQLExecDirect(). (In this case, the query will be executed only once, so there s no advantage to using SQLPrepare() and SQLExecute() separately.) The dbnumcols() call becomes SQLNumResultCols(). The calls to obtain column information (dbcolname(), dbcoltype(), dbcollen()) become a single call to SQLDescribeCol(). The dbnextrow() call becomes SQLFetch(). All of the other changes in the program are made to support these changes in the API functions.
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