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default: /* For simplicity, we don t handle bit strings, etc. */ printf( Cannot handle data type %d\n", (integer)type); exit(); } } /* Fetch and display the rows of query results */ while (status = SQLFetch(stmt1_hdl) == SQL_SUCCESS) { /* Loop, printing data for each column of the row / printf( \n ); for(i = 0; i < colcount; i++) { /* Print column label */ printf( Column # %d (%s): , i+1, item_name[i]); /* Check indicator variable for NULL indication */ if (item_ind[i] == SQL_NULL_DATA){ puts( is NULL!\n ); continue; } /* Handle each returned (maybe converted) data type separately / switch(item_type[i]) { case SQL_C_CHAR: /* Returned as text data - just display it */ puts(item_data[i]); break; case SQL_C_SLONG: /* Four-byte integer data - convert & display it */ printf( %ld , *((int *)(item_data[i]))); break; case SQL_C_DOUBLE: /* Floating-point data convert & display it */ printf( %lf , *((double *)(item_data[i]))); break;
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printf( \nEnd of data.\n ): /* Clean up allocated storage */ for (i = 0; i < colcount; i++) { free(item_data[i]); free(item_name[i]); } SQLDisconnect(conn_hdl); SQLFreeHandle(SQL_HANDLE_STMT, stmt1_hdl); SQLFreeHandle(SQL_HANDLE_STMT, stmt2_hdl); SQLFreeHandle(SQL_HANDLE_DBC, conn_hdl); SQLFreeHandle(SQL_HANDLE_ENV, env_hdl); exit(); }
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If you compare the program in Figure 19-20 with the corresponding embedded dynamic SQL program in Figure 18-9, 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. The alternative CLI method for dynamic query processing involves CLI descriptors. A CLI descriptor contains low-level information about a statement parameter (a parameter descriptor) or a column of query results (a row descriptor). The information in the descriptor is like that contained in the variable area of the SQLDA the column or parameter s name, data type and subtype, length, data buffer location, NULL indicator location, and so on. The parameter descriptors and row descriptors thus correspond to the input and output SQLDAs provided by some DBMS brands in their embedded dynamic SQL implementations. CLI descriptors are identified by descriptor handles. The CLI provides a default set of descriptors for parameters and query results columns when a statement is prepared. Alternatively, the program can allocate its own descriptors and use them. The handles of the descriptors for a statement are considered statement attributes, and they are associated with a particular statement handle. The descriptor handle values can be retrieved and set by the application program using the attribute management routines, described later in the section CLI Attributes. Two calls are used to retrieve information from a descriptor, given its handle. The SQLGetDescField() call retrieves a particular field of a descriptor, which is identified
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SQL APIs
by a code value. It is typically used to obtain the data type or length of a query results column, for example. The SQLGetDescRec() call retrieves many pieces of information in one call, including the column or parameter name, data type and subtype, length, precision and scale, and whether it may contain NULL values. A corresponding set of calls is used to place information into a descriptor. The SQLSetDescField() call sets the value of a single piece of information within a descriptor. The SQLSetDescRec() sets multiple values in a single call, including the data type and subtype, length, precision and scale, and nullability. For convenience, the CLI provides a SQLCopyDesc() call that copies all of the values from one descriptor to another.
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