EXEC SQL CONNECT :userid IDENTIFIED BY :passwd;
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1 SQL with C Test Program 1: Select a row with one column int value; EXEC SQL select max (b) into :value from r; printf ("connected\n"); printf ("max (b) = %d\n", value); Ensure that your library path is set (refer slides), and make it, and then execute it. Note that we need a table called r with at least one column called b for this. Test Program 2: Select a row with multiple columns int val1, val2;
2 10; EXEC SQL SELECT a, b into :val1, :val2 from r where a = 2 and b = printf ("val1 = %d::val2 = %d\n", val1, val2); Test Program 3: Introducing Cursors
3 EXEC SQL DECLARE mycursor CURSOR FOR select pnumber, pname from professor; EXEC SQL FETCH mycursor INTO :pnumber, :pname; Test Program 4: Updating with a cursor int n = 0; strcpy ((char *) passwd.arr, "mmani");
4 EXEC SQL DECLARE mycursor CURSOR FOR select pnumber, pname from professor FOR UPDATE OF pnumber; EXEC SQL FETCH mycursor INTO :pnumber, :pname; pnumber = pnumber + 1; EXEC SQL UPDATE professor SET pnumber = :pnumber WHERE CURRENT OF mycursor; EXEC SQL commit; exit (0); Test Program 5: DELETING Using cursors int n = 0; strcpy ((char *) userid.arr, "mmani"); userid.len = strlen ((char *) userid.arr); strcpy ((char *) passwd.arr, "mmani"); passwd.len = strlen ((char *) passwd.arr);
5 EXEC SQL DECLARE mycursor CURSOR FOR select pnumber, pname from professor FOR UPDATE; EXEC SQL FETCH mycursor INTO :pnumber, :pname; mycursor; pnumber = pnumber + 1; if (pnumber >= 7) { EXEC SQL DELETE FROM professor WHERE CURRENT OF EXEC SQL commit; exit (0); Test Program 6: Handling Null values and also introducing scrollable cursors short isnullnumber;
6 strcpy ((char *) userid.arr, "mmani"); EXEC SQL DECLARE mycursor SCROLL CURSOR FOR select snumber, sname from student; EXEC SQL FETCH RELATIVE 2 mycursor INTO :pnumber:isnullnumber, :pname; continue; if (isnullnumber == -1) { printf ("NULL value\n"); /* */
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