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The dynamic DECLARE CURSOR statement, shown in Figure 18-11, is a variation of the static DECLARE CURSOR statement. Recall from 17 that the static DECLARE CURSOR statement literally specifies a query by including the SELECT statement as one of its clauses. By contrast, the dynamic DECLARE CURSOR statement specifies the query indirectly, by specifying the statement name associated with the query by the PREPARE statement. Like the static DECLARE CURSOR statement, the dynamic DECLARE CURSOR statement is a directive to the SQL precompiler rather than an executable statement. It must appear before any other references to the cursor that it declares. The cursor name declared by this statement is used in subsequent OPEN, FETCH, and CLOSE statements to process the results of the dynamic query.

19:

The dynamic OPEN statement, shown in Figure 18-12, is a variation of the static OPEN statement. It causes the DBMS to begin executing a query and positions the associated cursor just before the first row of query results. When the OPEN statement completes successfully, the cursor is in an open state and is ready to be used in a FETCH statement. The role of the OPEN statement for dynamic queries parallels the role of the EXECUTE statement for other dynamic SQL statements. Both the EXECUTE and the OPEN statements cause the DBMS to execute a statement previously compiled by the PREPARE statement. If the dynamic query text includes one or more parameter markers, then the OPEN statement, like the EXECUTE statement, must supply values for these parameters. The USING clause specifies parameter values, and it has an identical format in both the EXECUTE and OPEN statements.

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FIGURE 18-11

1 The program prepares a login record, filling in the user name, password, and any other information required to connect to the DBMS 2 The program calls dbopen() to establish a connection to the DBMS A connection must exist before the program can send SQL statements to SQL Server 3 The program builds a SQL statement in a buffer and calls dbcmd() to pass the SQL text to dblib Successive calls to dbcmd() add to the previously passed text; there is no requirement that a complete SQL statement be sent in a single dbcmd() call 4 The program calls dbsqlexec(), instructing SQL Server to execute the statement previously passed with dbcmd() 5 The program calls dbresults() to determine the success or failure of the statement 6 The program calls dbexit() to close down the connection to SQL Server.

18:

It s instructive to compare the programs in Figure 19-3 and Figure 17-17 to see the differences between the embedded SQL and the dblib approach: I The embedded SQL program either implicitly connects to the only available database (as in DB2), or it includes an embedded SQL statement for connection (such as the CONNECT statement specified by the SQL2 standard) The dblib program connects to a particular SQL Server with the dbopen() call I The actual SQL UPDATE statement processed by the DBMS is identical in both programs With embedded SQL, the statement is part of the program s source code With dblib, the statement is passed to the API as a sequence of one or more character strings In fact, the dblib approach more closely resembles the dynamic SQL EXECUTE IMMEDIATE statement than static SQL.

Dynamic SQL*

I In the embedded SQL program, host variables provide the link between the SQL statements and the values of program variables With dblib, the program passes variable values to the DBMS in the same way that it passes program text as part of a SQL statement string I With embedded SQL, errors are returned in the SQLCODE or SQLSTATE field of the SQLCA structure With dblib, the dbresults() call retrieves the status of each SQL statement Overall, the embedded SQL program in Figure 17-17 is shorter and probably easier to read However, the program is neither purely C nor purely SQL, and a programmer must be trained in the use of embedded SQL to understand it The use of host variables means that the interactive and embedded forms of the SQL statement are different.

FIGURE 18-12

In addition, the embedded SQL program must be processed both by the SQL precompiler and by the C compiler, lengthening the compilation cycle In contrast, the SQL Server program is a plain vanilla C program, directly acceptable to the C compiler, and does not require special coding techniques..

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