ORA-00904 :标识符无效

• 执行如下SQL 出现以下ERROR

 1 create or replace procedure P_DISTABLE_FK(IN_TABLE in varchar2) is

 2 --失效 输入表名称的外键

 3 V_SQL VARCHAR2(200) ;

 4 V_FK  VARCHAR2(60); 

 5 begin

 6       --查询外键名称

 7       V_SQL :='SELECT * FROM USER_CONSTRAINTS WHERE CONSTRAINT_TYPE='|| 'R'||  '  and  table_name='||IN_TABLE;

 8        dbms_output.put_line(  ' V_SQL IS ' ||  V_SQL);

 9     

10       execute immediate V_SQL into V_FK;

11       v_sql:='alter table'|| IN_TABLE ||'disable constraint '||V_FK;  

12       EXECUTE IMMEDIATE v_sql;

13 end P_DISTABLE_FK;

• 打印 V_SQL 变量　：

 V_SQL IS SELECT * FROM USER_CONSTRAINTS WHERE CONSTRAINT_TYPE=R  and  table_name='B';

• 发现问题出在：CONSTRAINT_TYPE=R

 SQL 应该为：SELECT * FROM USER_CONSTRAINTS WHERE CONSTRAINT_TYPE='R'  and  table_name='B';

修改存储过程：

create or replace procedure P_DISTABLE_FK(IN_TABLE in varchar2,IN_TYPE IN VARCHAR2) is

--失效 输入表名称的外键

V_SQL VARCHAR2(200) ;

V_FK  VARCHAR2(60);  

begin

      --查询外键名称

      V_SQL :='SELECT * FROM USER_CONSTRAINTS WHERE CONSTRAINT_TYPE='|| IN_TYPE||  '  and  table_name='||IN_TABLE;

       dbms_output.put_line(  ' V_SQL IS ' ||  V_SQL);

    

      execute immediate V_SQL into V_FK;

      v_sql:='alter table'|| IN_TABLE ||'disable constraint '||V_FK;  

      EXECUTE IMMEDIATE v_sql;

end P_DISTABLE_FK;

这样输出的SQL 就为：正确形式了

SELECT * FROM USER_CONSTRAINTS WHERE CONSTRAINT_TYPE='R'  and  table_name='B'