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PART V
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Function Database connection/disconnection dblogin() dbopen() dbuse() dbexit() Basic statement processing dbcmd() dbsqlexec() dbresults() dbcancel() Error handling dbmsghandle() dberrhandle() Query results processing dbbind() dbnextrow() dbnumcols() dbcolname() dbcoltype() dbcollen() dbdata() dbdatlen() dbcanquery()
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TABLE 19-1 Basic dblib API Functions
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Description Provides a data structure for login information Opens a connection to SQL Server Establishes the default database Closes a connection to SQL Server 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 Establishes a user-written message-handler procedure Establishes a user-written error-handler procedure 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
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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 the program in Figure 17-17 (reproduced here as Figure 19-4), but uses the SQL Server API instead of embedded SQL. The figure illustrates the basic interaction between a program and SQL Server: 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.
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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;
/* 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(); 6 5 4 3 2 1
PART V
FIGURE 19-3
A simple program using dblib
Part V:
Programming with SQL
main() { exec sql include sqlca; exec sql begin declare section; float amount; exec sql end declare section; /* Prompt the user for the amount of quota increase/decrease */ printf("Raise/lower quotas by how much:"); scanf("%f", &amount); /* Update the QUOTA column in the SALESREPS table */ exec sql update salesreps set quota = quota + :amount; /* Check results of statement execution */ if (sqlqa.sqlcode != 0) printf("Error during update.\n"); else printf("Update successful.\n"); exit(); } /* amount (from user) */
FIGURE 19-4
The same program in Figure 19-3 using embedded SQL (from Figure 17-17)
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.
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