PLSQL块 实例1: 禁止在休息日(周六、周日)改变emp表的数据。 --思路: 使用to_char(sysdate, 'day')函数; 采用语句触发器。CREATEORREPLACETRIGGERemp_trigger BEFOREINSERTORUPDATEORDELETEONempBEGINIFto_char(sysdate,'day')IN('星期六','星期日')THENRAISE_APPLICATION_ERROR(-20006,'不能在休息日改变员工...
tr_ai_student_info_1 begin if inserting then dbms_output.put_line('插入操作 2'); end if; end; / 测试语句: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 insert into scott.student_info(sno, name, sex) values(5, '赵六', '女'); PL/SQL 输出窗口: 代码语言:javascript 代码运行...
dbms_output.put_line('name is :'||name); end;declare no001 emp.empno%type; name001 emp.ename%type; begin select empno,ename --将SQL查询结果存入变量(必须返回一行,不能多行) into no001,name001 from emp where empno=7369; dbms_output.put_line('no001 is :'||no001); dbms_output.put_...
dbms_output.put_line(cur_trigger.trigger_sql); execute immediate cur_trigger.trigger_sql; endloop; end;
dbms_output.put_line('无操作!'); end case; end; 测试语句: update scott.student_info t set t.sex = '1' where t.sno <= 3; PL/SQL 输出窗口:3 条记录,故共触发 3 次,若去掉for each row,再执行上述操作,则仅触发1次 2.1.2 follows ...
As a new DBA, I am tasked with logging all changes to a table, who changed a particular row of data on a table, and when they made those changes in the Microsoft SQL Server DBMS. How can I do this in a simple but effective way? I think I can use a trigger, but I’m unsure ...
Learn about PL/SQL triggers, their types, and how to use them effectively in your database applications.
We will also provide detailed examples of how to use triggers to perform common tasks in database management. What is a Trigger in MySQL? A trigger is a set of instructions that are automatically executed by the database management system (DBMS) when a specific event occurs in the database...
12 n := ora_sql_txt(sql_text); 13 for i in 1 .. n loop 14 str_stmt := substr(str_stmt || sql_text(i), 1, 3000); 15 end loop; 16 dbms_application_info.READ_MODULE(v_module, v_action); 17 INSERT INTO chf.t_ddl_audit ...
dbms_output.put_line('新增员工成功'); end insertStaffHint; 触发器的应用场景 复杂的安全性检查 数据的确认 数据库审计 数据的备份和审计 触发器的语法 ? 1 2 3 4 5 6 7 8 9 CREATE [OR REPLACE] TRIGGER trigger_name {BEFORE | AFTER } {INSERT | DELETE | UPDATE [OF column [, column …...