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/* Set frequently used info in a CLI descriptor */ SQLSMALLINT SQLSetDescRec ( SQLINTEGER SQLSMALLINT SQLSMALLINT SQLSMALLINT SQLSMALLINT SQLSMALLINT SQLSMALLINT void SQLSMALLINT descHdl, recnr, datatype, subtype, length, precis, scale, *databuf, buflen, /* IN: /* IN: /* IN: /* IN: /* IN: /* IN: /* IN: /* IN: /* IN: /* IN: descriptor handle */ descriptor record number */ data type code for item */ data type subcode for item */ length of item */ precision of item, if numeric */ scale of item, if numeric */ data buffer address for item */ data buffer length */ indicator buffer addr for item */
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SQLSMALLINT *indbuf)
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/* Get detailed info about an item described by a CLI descriptor */ SQLSMALLINT SQLGetDescField ( SQLINTEGER SQLSMALLINT SQLSMALLINT void SQLSMALLINT descHdl, recnr, attrcode, *attrinfo, buflen, /* IN: /* IN: /* IN: /* IN: /* IN: descriptor handle */ descriptor record number */ code of attribute to describe */ buffer for attribute info */ length of attribute info */
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SQLSMALLINT *actlen)
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/* OUT: actual length of returned info */
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/* Set value of an item described by a CLI descriptor */ SQLSMALLINT SQLSetDescField ( SQLINTEGER SQLSMALLINT SQLSMALLINT void SQLSMALLINT descHdl, recnr, attrcode, *attrinfo, buflen) /* IN: /* IN: /* IN: /* IN: /* IN: 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 */ SQLSMALLINT SQLCopyDesc ( SQLINTEGER SQLINTEGER */ indscHdl, outdscHdl) /* IN: /* IN: source descriptor handle */ destination descriptor handle
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FIGURE 19-25
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CLI dynamic query-processing calls (continued)
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19:
SQL APIs
Here are the steps for dynamic query processing using CLI: 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 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 19-26 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 19-16 and the dblib-based dynamic SQL query program shown in Figure 19-15. 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 19-15) and the CLI program (Figure 19-26) 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. If you compare the program in Figure 19-26 with the corresponding embedded dynamic SQL program in Figure 19-16, one of the major differences is embedded SQL s use of the special SQL Data Area (SQLDA) for column binding and column description. The CLI splits these functions between the SQLNumResultCols(), SQLDescribeCol(), and SQLBindCol() functions, and most programmers find the CLI structure easier to use and understand. However, the CLI provides an alternative, lower-level method that offers capabilities like those provided by the embedded SQLDA.
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