/*提示用户输入ORDER BY-子句*/ printf("Enter the ORDER BY clause:") scanf ("%s",orderby) strcat (sql string,orderby) /*提示用户输入要查询的课号*/ printf (Enter the course number:" scanf ("%s",GI VENCNO) EXEC SQL PREPARE query FROM sqlstring; /*声明游标*/ EXEC SQL DECLARE grade-cursor CURSOR FOR query; /*打开游标，取代战位器，执行相应$QL语句*/ EXEC SQL OPEN grade-cursor USING GIVENCNO; /*提示用户输入ORDER BY子句*/ printf("Enter the ORDER BY clause:"); scanf("%s", orderby); strcat(sqlstring,orderby); /*提示用户输入要查询的课号*/ printf(Enter the course number:"); scanf("%s",GIVENCNO); EXEC SQL PREPARE query FROM :sqlstring; /*声明游标*/ EXEC SQL DECLARE grade-cursor CURSOR FOR query; /*打开游标，取代战位器，执行相应SQL语句*/ EXEC SQL OPEN grade-cursor USING :GIVENCNO；