Sap Hana Studio(SQL脚本)触发器上的条件更新
我有两个示例表:Sap Hana Studio(SQL脚本)触发器上的条件更新,sap,hana,sql-scripts,hana-sql-script,hana-studio,Sap,Hana,Sql Scripts,Hana Sql Script,Hana Studio,我有两个示例表: TABLE1: ID | COLUMN_B| COLUMN_C _________|_________|_________ 1 | 0 | 1 ________|_________|_________ 2 | 0 | 1 ________|_________|_________ 3 | 0 | 1 TABL
TABLE1:
ID | COLUMN_B| COLUMN_C
_________|_________|_________
1 | 0 | 1
________|_________|_________
2 | 0 | 1
________|_________|_________
3 | 0 | 1
TABLE2:
ID | COLUMN_E| COLUMN_F
________|_________|________
1 | Y | X
________|_________|_________
2 | Y | X
________|_________|_________
3 | Y | X
我想做的是在Hana Studio上编写一个触发器,当表1中的B列被更新为特定值(比如100)时,使用SQL脚本更新表2中的E列。
表1中的行在表2中以第一列(ID)引用
我编写了以下代码:
create trigger "UPDATE_TABLES"
after update of "COLUMN_B" on "TABLE1"
referencing new row as new, old row as old
for each row
begin
update "TABLE2"
set "COLUMN_E" = 'my new value'
where :old."COLUMN_B" = '100' and "TABLE1"."ID" = :old."ID";
end;
当我将第1行的TABLE1.COLUMN_B设置为100时,我希望代码将第1行的TABLE2.COLUMN_E更改为“我的新值”,但什么也没有发生。有人能指出我到底做错了什么吗 新手失误。我希望列_e值随列_b中值的更改而更改,但实际上我正在跟踪列_b中的旧值。更正为:
create trigger "UPDATE_TABLES"
after update of "COLUMN_B" on "TABLE1"
referencing new row as new, old row as old
for each row
begin
update "TABLE2"
set "COLUMN_E" = 'my new value'
where :new."COLUMN_B" = '100' and "TABLE1"."ID" = :old."ID";
end;
成功了 我猜触发器代码中的UPDATE语句应该有如下细微的不同
create trigger "UPDATE_TABLES"
after update of "COLUMN_B" on "TABLE1"
referencing new row as new, old row as old
for each row
begin
update "TABLE2"
set "COLUMN_E" = 'my new value'
where :new."COLUMN_B" = '100'
and TABLE2.ID = :old."ID";
end;
否则,在创建触发器时会出现语法错误
你能核实一下吗?你完全正确。我只是在回答时把表1错当成了表2。