Pre-Insert trigger Pre-Insert Fires during the Post and Commit Transactions process, before a row is inserted. It fires once for each record that is marked for insert. Example This example assigns aprimary keyfield based on asequencenumber, and then writes a row into an auditing table, flag...
CREATE OR REPLACE TRIGGER emp_trigger BEFORE UPDATE OR DELETE OR INSERT ON emp BEGIN IF to_char(sysdate,'day') IN ('星期四','星期五') THEN RAISE_APPLICATION_ERROR(-20008,'不允许在周四周五修改emp表'); END IF; END; update emp set sal=800; 这里建立触发器以后,当你想改变所有人的工资时...
Example 9-13 Trigger Derives New Column Values(触发器派生新列值) CREATE OR REPLACE TRIGGER Derived BEFORE INSERT OR UPDATE OF Ename ON Emp /* Before updating the ENAME field, derive the values for the UPPERNAME and SOUNDEXNAME fields. Restrict users from updating these fields directly: */ FO...
-- statement级before trigger CREATEORREPLACETRIGGERsecure_emp BEFOREINSERTORDELETEORUPDATEONemployees BEGIN IF (TO_CHAR(SYSDATE,'DY')IN('SAT','SUN'))OR (TO_CHAR(SYSDATE,'HH24:MI')NOTBETWEEN'08:00'AND'18:00')THEN RAISE_APPLICATION_ERROR(-20500, 'You may modify EMPLOYEES table only on we...
Example:禁止在周四,周五修改emp表数据 CREATEORREPLACETRIGGERemp_trigger BEFOREUPDATEORDELETEORINSERTONempBEGINIFto_char(sysdate,'day')IN('星期四','星期五')THENRAISE_APPLICATION_ERROR(-20008,'不允许在周四周五修改emp表');ENDIF;END; updateempsetsal=800; ...
CREATE OR REPLACE TRIGGER trg_example. BEFORE INSERT. ON my_table. FOR EACH ROW. WHEN (new_column > 100)。 BEGIN. -触发器操作。 END; 在上面的例子中,触发器trg_example将在满足条件new_column > 100时触发,触发器操作将被执行。 需要注意的是,触发器的条件必须是一个有效的SQL表达式,并且必须返回...
1、ORACLE SID查看设置 查看SID、用户名 $ env|grep SID 、select * from v$instance、select instance_name,host_name from v$instance; 查看数据库所有用户及用户状态: SQL> select usernames,account_status from dba_users; 设置SID $ export ORACLE_SID=hisvhfs ...
添加对基本 ALTER TRIGGER/ALTER INDEX DDL 的支持(启用/禁用等) 对匹配内置函数名称的列进行了转换改进 为可为 NULL 的列生成筛选的唯一索引 改进了 Azure Synapse Analytics 的变量声明转换 修复项目名称中的特殊字符问题 SSMA v8.8 SSMA for Oracle 的 v8.8 版本包括: SQL Server 对象同步稳定性改进 评估和转...
createorreplaceTRIGGERAFTERDELETEORINSERTORUPDATEON"PK","c1","c2"OFmy_name.my_tableFOREACHROW... 完成修改后,右键单击触发器名称并选择编译以编译修订后的触发器。 确保生成的触发器在编译后标识为有效。 如何还原已发布表或其关联的表空间以读取写入: ...
TRIGGER -o triggers.sql -b %namespace%/schema/triggers -c %namespace%/config/ora2pg.conf ora2pg -p -t TYPE -o types.sql -b %namespace%/schema/types -c %namespace%/config/ora2pg.conf ora2pg -p -t VIEW -o views.sql -b %namespace%/schema/views -c %namespace%/config/ora...