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In a large mainframe or enterprise-level network DBMS installation, the corporate database administrator is solely responsible for creating new databases. On smaller workgroup DBMS installations, individual users may be allowed to create their own personal databases, but it's much more common for databases to be created centrally and then accessed by individual users. If you are using a personal computer DBMS, you are probably both the database administrator and the user, and you will have to create the database(s) that you use personally.

Some programming languages support data structures, which are named collections of variables. For these languages, a SQL precompiler may allow you to treat the entire data structure as a single, composite host variable in the INTO clause. Instead of specifying a separate host variable as the destination for each column of query results, you can specify a data structure as the destination for the entire row. Figure 17-22 shows the program from Figure 17-21, rewritten to use a C data structure.

Callable API ODBC, JDBC, JSQL ODBC, JDBC DB library (dblib), ODBC C-api (proprietary), ODBC, JDBC, Perl, PHP, Ruby, other scripting languages Oracle Call Interface (OCI), ODBC, JDBC, JSQL, PHP, Perl DB library (dblib), ODBC, JDBC, SQLJ

main() { exec sql include sqlca; exec sql begin declare section; int repnum; struct { char name[16]; float quota; float sales; } repinfo; short rep_ind[3]; exec sql end declare section;

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The basic techniques of embedded SQL, called static SQL, are described in this chapter. Some advanced features of embedded SQL, called dynamic SQL, are discussed in 18. Callable SQL APIs, including the Sybase/SQL Server API, ODBC, and JDBC, are discussed in 19.

/* employee number (from user) */ /* retrieved salesperson name */ /* retrieved quota */ /* retrieved sales */ /* null indicator array */

To understand any of the programmatic SQL techniques, it helps to understand a little bit more about how the DBMS processes SQL statements. To process a SQL statement, the DBMS goes through a series of five steps, shown in Figure 17-1: 1. The DBMS begins by parsing the SQL statement. It breaks up the statement into individual words, making sure that the statement has a valid verb, legal clauses, and so on. Syntax errors and misspellings can be detected in this step. 2. The DBMS validates the statement. It checks the statement against the system catalog. Do all the tables named in the statement exist in the database Do all of the columns exist, and are the column names unambiguous Does the user have the required privileges to execute the statement Semantic errors are detected in this step. 3. The DBMS optimizes the statement. It explores various ways to carry out the statement. Can an index be used to speed a search Should the DBMS first apply a search condition to Table A and then join it to Table B, or should it begin with the join and use the search condition afterward Can a sequential search through a table be avoided or reduced to a subset of the table Can an index be used to avoid a sort After exploring alternatives, the DBMS chooses one of them. 4. The DBMS then generates an application plan for the statement. The application plan is a binary representation of the steps that are required to carry out the statement; it is the DBMS equivalent of executable code. 5. Finally, the DBMS carries out the statement by executing the application plan.

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/* Prompt the user for the employee number */ printf("Enter salesrep number: "); scanf("%d", &repnum); /* Execute the SQL query */ exec sql select name, quota, sales from salesreps where empl_num = :repnum into :repinfo :rep_ind; /* Display the retrieved data */ if (sqlca.sqlcode = = 0) { printf("Name: %s\n", repinfo.name); if (rep_ind[1] < 0) printf("quota is NULL\n"); else printf("Quota: %f\n", repinfo.quota); printf("Sales: %f\n", repinfo.sales); } else if (sqlca.sqlcode = = 100) printf("No salesperson with that employee number.\n"); else printf("SQL error: %ld\n", sqlca.sqlcode); exit(); }

Part V:

FIGURE 17-1

Figure 17-22.

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