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main() { LOGINREC char int *loginrec; amount_str[31]; status; /* data structure for login information */ /* data structure for connection */ /* amount entered by user (as a string) */ /* dblib call return status */ DBPROCESS *dbproc;
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/* Get a login structure and set user name & password */ loginrec = dblogin(); DBSETLUSER(loginrec, scott ); DBSETLPWD (loginrec, tiger ); /* Connect to SQL Server */ dbproc = dbopen(loginrec, ); /* Prompt the user for the amount of quota increase/decrease */ printf( Raise/lower by how much: ); gets(amount_str); /* Pass SQL statement to dblib */ dbcmd(dbproc, update salesreps set quota = quota + ); dbcmd(dbproc, amount_str); /* Ask SQL Server to execute the statement */ dbsqlexec(dbproc); /* Get results of statement execution */ status = dbresults(dbproc); if (status ! = SUCCEED) printf( Error during update.\n ); else printf( Update successful.\n ); /* Break connection to SQL Server */ dbexit(dbproc); exit(); }
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Figure 19-3.
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A simple program using dblib
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the program in Figure 17-17, but uses the SQL Server API instead of embedded SQL. The figure illustrates the basic interaction between a program and SQL Server:
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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. 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. 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. 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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