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update table-name set second-column-name = where first-column-name =
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The user s input thus determines the table to be updated, the column to be updated, and the search condition to be used. The search comparison value and the updated data value are specified as parameters, to be supplied later when the UPDATE statement is actually executed.
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main() { /* This is a general-purpose update program. It can be used for any update where a numeric column is to be updated in all rows where a second numeric column has a specified value. For example, you can use it to update quotas for selected salespeople or to update credit limits for selected customers. */ exec sql exec sql char float float exec sql char char char char include sqlca; begin declare section; stmtbuf[301] /* SQL text to be executed */ /* parameter value for searching */ search_value; new_value; /* parameter value for update */ end declare section; /* /* /* /* table to be updated */ name of search column */ name of update column */ yes/no response from user */
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tblname[31]; searchcol[31]; updatecol[31]; yes_no[31];
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/* Prompt user for printf("Enter name gets(tblname); printf("Enter name gets(searchcol); printf("Enter name gets(updatecol);
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table name and column name */ of table to be updated: "); of column to be searched: of column to be updated: "); ");
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/* Build SQL statement in buffer; ask DBMS to compile it */ sprintf(stmtbuf, "update %s set %s = where %s = ", tblname, searchcol, updatecol); exec sql prepare mystmt from :stmtbuf; if (sqlca.sqlcode) { printf("PREPARE error: %ld\n", sqlca.sqlcode); exit(); } /* Loop prompting user for parameters and performing updates */ for ( ; ; ) { printf("\nEnter search value for %s: ", searchcol); scanf("%f", &search_value); printf("Enter new value for %s: ", updatecol); scanf("%f", &new_value); /* Ask the DBMS to execute the UPDATE statement */ execute mystmt using :search_value, :new_value; if (sqlca.sqlcode) { printf("EXECUTE error: %ld\n", sqlca.sqlcode); exit(); } /* Ask user if there is another update */ printf("Another (y/n) "); gets(yes_no); if (yes_no[0] == 'n') break; } printf("\nUpdates complete.\n"); exit(); }
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FIGURE 18-4
Using the PREPARE and EXECUTE statements
18:
Dynamic SQL*
After building the UPDATE statement text in its buffer, the program asks the DBMS to compile it with the PREPARE statement. The program then enters a loop, prompting the user to enter pairs of parameter values to perform a sequence of table updates. This user dialog shows how you could use the program in Figure 18-4 to update the quotas for selected salespeople:
Enter name of table to be updated: staff Enter name of column to be searched: empl_num Enter name of column to be updated: quota Enter search value for empl_num: 106 Enter new value for quota: 150000.00 Another (y/n) y Enter search value for empl_num: 102 Enter new value for quota: 225000.00 Another (y/n) y Enter search value for empl_num: 107 Enter new value for quota: 215000.00 Another (y/n) n Updates complete.
This program is a good example of a situation where two-step dynamic execution is appropriate. The DBMS compiles the dynamic UPDATE statement only once, but executes it three times, once for each set of parameter values entered by the user. If the program had been written using EXECUTE IMMEDIATE instead, the dynamic UPDATE statement would have been compiled three times and executed three times. Thus, the two-step dynamic execution of PREPARE and EXECUTE helps to eliminate some of the performance disadvantage of dynamic SQL. As mentioned earlier, this same two-step approach is used by all of the callable SQL APIs described in 19.
The PREPARE Statement
The PREPARE statement, shown in Figure 18-5, is unique to dynamic SQL. It accepts a host variable containing a SQL statement string and passes the statement to the DBMS. The DBMS compiles the statement text and prepares it for execution by generating an application plan. The DBMS sets the SQLCODE/SQLSTATE variables to indicate any errors detected in the statement text. As described previously, the statement string can contain a parameter marker, indicated by a question mark, anywhere that a constant can appear. The parameter marker signals the DBMS that a value for the parameter will be supplied later, when the statement is actually executed.
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