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  • Oracle笔记 七、PL/SQL 异常处理

    --异常处理
    declare
      sNum number := 0;
    begin
      sNum := 5 / sNum;  
      dbms_output.put_line(sNum);
    exception 
      when others then
        dbms_output.put_line('is Error!');
    end;
     
    --自定义异常
    declare
           ex_custom_invaild_age exception; --自定义的异常myerr
           age int;
    begin
         age := &请输入年龄;
         if (age < 0) then
            raise ex_custom_invaild_age; --引发自定义异常
         else
            dbms_output.put_line('年龄是:' || age);     
         end if;
    exception 
          when ex_custom_invaild_age then
            dbms_output.put_line('非法的年龄');
    end;
     
    --引发应用程序异常
    --raise_application_error(异常编号,说明);
    declare        
           age int;
    begin
         age := &请输入年龄;
         if (age < 0) then
            raise_application_error(-20500, '年龄不能为负数');
         else
            dbms_output.put_line('年龄是:' || age);
         end if;
    end;
     
    --非预定义异常
    declare     
         ex_custom_error exception;
         pragma exception_init(ex_custom_error, -1); --把一个编号和一个自定义异常关联,
         --相当于把-1编号的异常命名为ex_custom_error,这样就可以捕获这种异常
    begin       
         insert into dept values(10, 'aaa', 'bbb');
         exception       
           when ex_custom_error then
           dbms_output.put_line('部门编号已经存在');
    end;
     
    --异常处理
    declare
      vSal emp.sal%type;
    begin
      select sal into vSal from emp;
      exception
        when too_many_rows then
          dbms_output.put_line('多条数据');
        when others then
          dbms_output.put_line('Error');
    end;
     
    declare
      vSal emp.sal%type;
    begin
      select sal into vSal from emp where empno = 1;
      exception
        when no_data_found then
          dbms_output.put_line('没有数据');
        when others then
          dbms_output.put_line('Error');
    end;
     
    --异常日志处理
    create table errorLog (
           id number primary key,
           errCode number,
           errMsg varchar2(1024),
           errDate date
    );
    --创建序列,从1开始,每次加1
    create sequence seq_errorLog_id start with 1 increment by 1;
     
    declare
           vDeptno dept.deptno%type := 10;
           vErrCode number;
           vErrMsg varchar2(1024);
    begin
      delete from dept where deptno = vDeptno;
      commit;
      exception
        when others then
          rollback;
          vErrCode := SQLCODE;
          vErrMsg := SQLERRM;
          insert into errorLog values(seq_errorLog_id.nextval, vErrCode, vErrMsg, sysdate);
          commit;
    end;
     
    select * from errorLog;
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  • 原文地址:https://www.cnblogs.com/jx270/p/4055546.html
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