函数:
- SQL code
CREATE OR REPLACE FUNCTION id_is_good (i_student_id IN NUMBER) RETURN BOOLEANAS v_id_cnt NUMBER;BEGIN SELECT COUNT(*) INTO v_id_cnt FROM student WHERE student_id = i_student_id; RETURN 1 = v_id_cnt;EXCEPTION WHEN OTHERS THEN RETURN FALSE;END id_is_good;
调用:
- SQL code
1 declare 2 v_local_first_name student.first_name%type; 3 v_local_last_name student.last_name%type; 4 rst BOOLEAN ; 5 begin 6 rst := id_is_good(&sv,v_local_first_name, v_local_last_name); 7 dbms_output.put_line(rst); 8 end;
运行的时候在pl/sql developer,我输入一个数字,但报错:
ORA-06550: line 6, column 10:
PLS-00306: wrong number or types of arguments in call to 'ID_IS_GOOD'
ORA-06550: line 6, column 3:
PL/SQL: Statement ignored
ORA-06550: line 7, column 3:
PLS-00306: wrong number or types of arguments in call to 'PUT_LINE'
ORA-06550: line 7, column 3:
PL/SQL: Statement ignored
我实在是看不出来哪错了,plsql就是这样,提示得总是啰哩啰嗦,还没说到点上。就像它的文档写得一样烂。
------解决方案--------------------
1、调用时参数个数太多。
2、dbms_output.put_line函数不能打印blooean类型的值。
- SQL code
--如果需要打印,可以这样if rst then dbms_output.put_line('TRUE');else dbms_output.put_line('FALSE');end if;