Detailed Dynamic Sql Program - HP NonStop SQL/MP Programming Manual

Dynamic SQL Operations
Example 10-7. Basic Dynamic SQL Program (page 4 of 4)
182 switch (sel_index)
183 {
184 case 1 : strcpy(column, "EMPNUM ");
185
186 case 2 : strcpy(column, "JOBCODE ");
187
188 case 3 : strcpy(column, "DEPTNUM ");
189
190 }
191
192 printf("\nPlease enter the comparison criteria:\n");
193 printf("(for example: > 500, = 1000, <= 250)\n\n");
194
195 fgets(temp, (int)sizeof(temp), stdin);
196 sscanf(temp, "%[^\n]", predicate);
197
198 /* Construct the SQL statement:
199 strcat (cmd, column);
200 strcat (cmd, predicate);
201
202 /* Get length of command string and blank out null */
203 /* terminator for transmission to SQL:
204 len = strlen(cmd);
205 cmd[len] = ' ';
206
207 } /* end of get_cmd
208
209 /* --------------------------------------------------
210
211 main()
212 {
213 /* Initialize command string to blanks:
214 setmem (cmd, MAXCMD, ' ');
215
216 /* Get SQL statement from the user:
217 get_cmd(cmd);
218
219 /* Compile the statement, access the SQL database, and */
220 /* report the result: */
221 process_and_execute(cmd);
222
223 } /* end of main */

Detailed Dynamic SQL Program

This program allows the user to enter any statement. The program prepares and runs
the statement in a TMF transaction. The code is independent of any database because
the program does not reference database definitions; only the entered statements
reference a particular database.
The program performs these operations, which characterize dynamic SQL programs:

Declares an SQLSA to determine the number of input parameters or output
variables.

Declares an SQLDA to describe input parameters and another to describe output
variables. Because the program is allocating memory at run time, the SQLDA is
declared as a template and allocated dynamically when the query is run.
HP NonStop SQL/MP Programming Manual for C—429847-008
break;
break;
break;
10-42
Detailed Dynamic SQL Program
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