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Basic statement processing dbcmd() dbsqlexec() dbresults() dbcancel() Error handling dbmsghandle() dberrhandle() Query results processing Dbbind() dbnextrow() dbnumcols() dbcolname() dbcoltype() dbcollen() Dbdata() dbdatlen() dbcanquery() Table 19-1. Binds a query results column to a program variable Fetches the next row of query results Obtains the number of columns of query results Obtains the name of a query results column Obtains the data type of a query results column Obtains the maximum length of a query results column Obtains a pointer to a retrieved data value Obtains the actual length of a retrieved data value Cancels a query before all rows are fetched Establishes a user-written message-handler procedure Establishes a user-written error-handler procedure Passes SQL statement text to dblib Requests execution of a statement batch Obtains results of next SQL statement in a batch Cancels the remainder of a statement batch

A complication of using the DESCRIBE statement is that your program may not know in advance how many columns of query results there will be; therefore, it may not know how large a SQLDA must be allocated to receive the description One of three strategies is typically used to ensure that the SQLDA has enough space for the returned descriptions: If the program has generated the select list of the query, it can keep a running count of the select items as it generates them In this case, the program can allocate a SQLDA with exactly the right number of SQLVAR structures to receive the column descriptions This approach was used in the program shown in Figure 18-9 If it is inconvenient for the program to count the number of select list items, it can initially DESCRIBE the dynamic query into a minimal SQLDA with a one-element SQLVAR array.

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A simple SQL Server program that updates a database can use a very small set of dblib calls to do its work. The program in Figure 19-3 implements a simple quota update application for the SALESREPS table in the sample database. It is identical to

When the DESCRIBE statement returns, the SQLD value tells the program how large the SQLDA must be The program can then allocate a SQLDA of the correct size and reexecute the DESCRIBE statement, specifying the new SQLDA There is no limit to the number of times that a prepared statement can be described Alternatively, the program can allocate a SQLDA with a SQLVAR array large enough to accommodate a typical query A DESCRIBE statement using this SQLDA will succeed most of the time If the SQLDA turns out to be too small for the query, the SQLD value tells the program how large the SQLDA must be, and it can allocate a larger one and DESCRIBE the statement again into that SQLDA The DESCRIBE statement is normally used for dynamic queries, but you can ask the DBMS to DESCRIBE any previously prepared statement.

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;

This feature is useful, for example, if a program needs to process an unknown SQL statement typed by a user The program can PREPARE and DESCRIBE the statement and examine the SQLD field in the SQLDA..

/* 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(); }

In each of these cases a sequence of four or five actions, where each action consists of a separate SQL statement, is required to handle the single "logical" transaction The transaction concept is critical for programs that update a database because it ensures the integrity of the database A SQL-based DBMS makes this commitment about the statements in a transaction: The statements in a transaction will be executed as an atomic unit of work in the database Either all of the statements will be executed successfully, or none of the statements will be executed The DBMS is responsible for keeping this commitment even if the application program aborts or a hardware failure occurs in the middle of the transaction, as shown in Figure 12-1 In each case, the DBMS must make sure that when failure recovery is complete, the database never reflects a "partial transaction".

Part V:

Figure 19-3.

If the SQLD field is zero, the statement text was not a query, and the EXECUTE statement can be used to execute it. If the SQLD field is positive, the statement text was a query, and the OPEN/FETCH/CLOSE statement sequence must be used to execute it.

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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