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Java 数据库触发器填充行插入和更新的当前日期无效 功能-

java postgresql triggers

Java 数据库触发器填充行插入和更新的当前日期无效 功能-,java,postgresql,triggers,Java,Postgresql,Triggers,创建函数： -- Function: created_func() CREATE OR REPLACE FUNCTION created_func() RETURNS trigger AS $BODY$ BEGIN -- Remember who changed the payroll when NEW.created_ts := current_timestamp; RETURN NEW; END; $BODY$ LAN

创建函数：

-- Function: created_func()

CREATE OR REPLACE FUNCTION created_func()
  RETURNS trigger AS
$BODY$
    BEGIN
        -- Remember who changed the payroll when
        NEW.created_ts := current_timestamp;
        RETURN NEW;
    END;
$BODY$
  LANGUAGE plpgsql VOLATILE
  COST 100;
ALTER FUNCTION created_func()
  OWNER TO postgres;

-- Function: updated_func()

CREATE OR REPLACE FUNCTION updated_func()
  RETURNS trigger AS
$BODY$
    BEGIN
        -- Remember who changed the payroll when
        NEW.updated_ts := current_timestamp;
        RETURN NEW;
    END;
$BODY$
  LANGUAGE plpgsql VOLATILE
  COST 100;
ALTER FUNCTION updated_func()
  OWNER TO postgres;

-- Trigger: created_func on drcschema.dr_event

CREATE TRIGGER created_func
  BEFORE INSERT
  ON drcschema.dr_event
  FOR EACH ROW
  EXECUTE PROCEDURE created_func();

-- Trigger: update_func on drcschema.dr_event

CREATE TRIGGER update_func
  AFTER UPDATE
  ON drcschema.dr_event
  FOR EACH ROW
  EXECUTE PROCEDURE updated_func();

<property name="createdTs" type="timestamp" generated="insert">
   <column name="created_ts" length="29" />
</property>
<property name="updatedTs" type="timestamp" generated="always">
   <column name="updated_ts" length="29" />
</property>
更新功能：

-- Function: created_func()

CREATE OR REPLACE FUNCTION created_func()
  RETURNS trigger AS
$BODY$
    BEGIN
        -- Remember who changed the payroll when
        NEW.created_ts := current_timestamp;
        RETURN NEW;
    END;
$BODY$
  LANGUAGE plpgsql VOLATILE
  COST 100;
ALTER FUNCTION created_func()
  OWNER TO postgres;

-- Function: updated_func()

CREATE OR REPLACE FUNCTION updated_func()
  RETURNS trigger AS
$BODY$
    BEGIN
        -- Remember who changed the payroll when
        NEW.updated_ts := current_timestamp;
        RETURN NEW;
    END;
$BODY$
  LANGUAGE plpgsql VOLATILE
  COST 100;
ALTER FUNCTION updated_func()
  OWNER TO postgres;

-- Trigger: created_func on drcschema.dr_event

CREATE TRIGGER created_func
  BEFORE INSERT
  ON drcschema.dr_event
  FOR EACH ROW
  EXECUTE PROCEDURE created_func();

-- Trigger: update_func on drcschema.dr_event

CREATE TRIGGER update_func
  AFTER UPDATE
  ON drcschema.dr_event
  FOR EACH ROW
  EXECUTE PROCEDURE updated_func();

<property name="createdTs" type="timestamp" generated="insert">
   <column name="created_ts" length="29" />
</property>
<property name="updatedTs" type="timestamp" generated="always">
   <column name="updated_ts" length="29" />
</property>
触发- 创建触发器：

-- Function: created_func()

CREATE OR REPLACE FUNCTION created_func()
  RETURNS trigger AS
$BODY$
    BEGIN
        -- Remember who changed the payroll when
        NEW.created_ts := current_timestamp;
        RETURN NEW;
    END;
$BODY$
  LANGUAGE plpgsql VOLATILE
  COST 100;
ALTER FUNCTION created_func()
  OWNER TO postgres;

-- Function: updated_func()

CREATE OR REPLACE FUNCTION updated_func()
  RETURNS trigger AS
$BODY$
    BEGIN
        -- Remember who changed the payroll when
        NEW.updated_ts := current_timestamp;
        RETURN NEW;
    END;
$BODY$
  LANGUAGE plpgsql VOLATILE
  COST 100;
ALTER FUNCTION updated_func()
  OWNER TO postgres;

-- Trigger: created_func on drcschema.dr_event

CREATE TRIGGER created_func
  BEFORE INSERT
  ON drcschema.dr_event
  FOR EACH ROW
  EXECUTE PROCEDURE created_func();

-- Trigger: update_func on drcschema.dr_event

CREATE TRIGGER update_func
  AFTER UPDATE
  ON drcschema.dr_event
  FOR EACH ROW
  EXECUTE PROCEDURE updated_func();

<property name="createdTs" type="timestamp" generated="insert">
   <column name="created_ts" length="29" />
</property>
<property name="updatedTs" type="timestamp" generated="always">
   <column name="updated_ts" length="29" />
</property>
更新触发器：

-- Function: created_func()

CREATE OR REPLACE FUNCTION created_func()
  RETURNS trigger AS
$BODY$
    BEGIN
        -- Remember who changed the payroll when
        NEW.created_ts := current_timestamp;
        RETURN NEW;
    END;
$BODY$
  LANGUAGE plpgsql VOLATILE
  COST 100;
ALTER FUNCTION created_func()
  OWNER TO postgres;

-- Function: updated_func()

CREATE OR REPLACE FUNCTION updated_func()
  RETURNS trigger AS
$BODY$
    BEGIN
        -- Remember who changed the payroll when
        NEW.updated_ts := current_timestamp;
        RETURN NEW;
    END;
$BODY$
  LANGUAGE plpgsql VOLATILE
  COST 100;
ALTER FUNCTION updated_func()
  OWNER TO postgres;

-- Trigger: created_func on drcschema.dr_event

CREATE TRIGGER created_func
  BEFORE INSERT
  ON drcschema.dr_event
  FOR EACH ROW
  EXECUTE PROCEDURE created_func();

-- Trigger: update_func on drcschema.dr_event

CREATE TRIGGER update_func
  AFTER UPDATE
  ON drcschema.dr_event
  FOR EACH ROW
  EXECUTE PROCEDURE updated_func();

<property name="createdTs" type="timestamp" generated="insert">
   <column name="created_ts" length="29" />
</property>
<property name="updatedTs" type="timestamp" generated="always">
   <column name="updated_ts" length="29" />
</property>
纵队- 已创建\u ts:

-- Function: created_func()

CREATE OR REPLACE FUNCTION created_func()
  RETURNS trigger AS
$BODY$
    BEGIN
        -- Remember who changed the payroll when
        NEW.created_ts := current_timestamp;
        RETURN NEW;
    END;
$BODY$
  LANGUAGE plpgsql VOLATILE
  COST 100;
ALTER FUNCTION created_func()
  OWNER TO postgres;

-- Function: updated_func()

CREATE OR REPLACE FUNCTION updated_func()
  RETURNS trigger AS
$BODY$
    BEGIN
        -- Remember who changed the payroll when
        NEW.updated_ts := current_timestamp;
        RETURN NEW;
    END;
$BODY$
  LANGUAGE plpgsql VOLATILE
  COST 100;
ALTER FUNCTION updated_func()
  OWNER TO postgres;

-- Trigger: created_func on drcschema.dr_event

CREATE TRIGGER created_func
  BEFORE INSERT
  ON drcschema.dr_event
  FOR EACH ROW
  EXECUTE PROCEDURE created_func();

-- Trigger: update_func on drcschema.dr_event

CREATE TRIGGER update_func
  AFTER UPDATE
  ON drcschema.dr_event
  FOR EACH ROW
  EXECUTE PROCEDURE updated_func();

<property name="createdTs" type="timestamp" generated="insert">
   <column name="created_ts" length="29" />
</property>
<property name="updatedTs" type="timestamp" generated="always">
   <column name="updated_ts" length="29" />
</property>
--列：已创建

ALTER TABLE drcschema.dr_event ADD COLUMN created_ts timestamp without time zone;
更新内容：

-- Function: created_func()

CREATE OR REPLACE FUNCTION created_func()
  RETURNS trigger AS
$BODY$
    BEGIN
        -- Remember who changed the payroll when
        NEW.created_ts := current_timestamp;
        RETURN NEW;
    END;
$BODY$
  LANGUAGE plpgsql VOLATILE
  COST 100;
ALTER FUNCTION created_func()
  OWNER TO postgres;

-- Function: updated_func()

CREATE OR REPLACE FUNCTION updated_func()
  RETURNS trigger AS
$BODY$
    BEGIN
        -- Remember who changed the payroll when
        NEW.updated_ts := current_timestamp;
        RETURN NEW;
    END;
$BODY$
  LANGUAGE plpgsql VOLATILE
  COST 100;
ALTER FUNCTION updated_func()
  OWNER TO postgres;

-- Trigger: created_func on drcschema.dr_event

CREATE TRIGGER created_func
  BEFORE INSERT
  ON drcschema.dr_event
  FOR EACH ROW
  EXECUTE PROCEDURE created_func();

-- Trigger: update_func on drcschema.dr_event

CREATE TRIGGER update_func
  AFTER UPDATE
  ON drcschema.dr_event
  FOR EACH ROW
  EXECUTE PROCEDURE updated_func();

<property name="createdTs" type="timestamp" generated="insert">
   <column name="created_ts" length="29" />
</property>
<property name="updatedTs" type="timestamp" generated="always">
   <column name="updated_ts" length="29" />
</property>
--专栏：更新版

ALTER TABLE drcschema.dr_event ADD COLUMN updated_ts timestamp without time zone;
DrEvent.hbm.xml:

-- Function: created_func()

CREATE OR REPLACE FUNCTION created_func()
  RETURNS trigger AS
$BODY$
    BEGIN
        -- Remember who changed the payroll when
        NEW.created_ts := current_timestamp;
        RETURN NEW;
    END;
$BODY$
  LANGUAGE plpgsql VOLATILE
  COST 100;
ALTER FUNCTION created_func()
  OWNER TO postgres;

-- Function: updated_func()

CREATE OR REPLACE FUNCTION updated_func()
  RETURNS trigger AS
$BODY$
    BEGIN
        -- Remember who changed the payroll when
        NEW.updated_ts := current_timestamp;
        RETURN NEW;
    END;
$BODY$
  LANGUAGE plpgsql VOLATILE
  COST 100;
ALTER FUNCTION updated_func()
  OWNER TO postgres;

-- Trigger: created_func on drcschema.dr_event

CREATE TRIGGER created_func
  BEFORE INSERT
  ON drcschema.dr_event
  FOR EACH ROW
  EXECUTE PROCEDURE created_func();

-- Trigger: update_func on drcschema.dr_event

CREATE TRIGGER update_func
  AFTER UPDATE
  ON drcschema.dr_event
  FOR EACH ROW
  EXECUTE PROCEDURE updated_func();

<property name="createdTs" type="timestamp" generated="insert">
   <column name="created_ts" length="29" />
</property>
<property name="updatedTs" type="timestamp" generated="always">
   <column name="updated_ts" length="29" />
</property>
在插入和更新行之后，我仍然没有在
updated\u ts
列中获得日期，如下所示-

在更新之前，您需要一个
触发器，否则更改将不会保留到表中

除此之外，对于如此相似的触发器功能，最好将它们合并为一个，以便“业务逻辑”位于一个位置，从而更易于维护：


CREATE OR REPLACE FUNCTION ins_upd_func() RETURNS trigger AS $BODY$
BEGIN
  -- Remember who changed the payroll when
  IF TG_OP = 'INSERT' THEN
    NEW.created_ts := current_timestamp;
  ELSE
    NEW.updated_ts := current_timestamp;
  END IF;
  RETURN NEW;
END; $BODY$ LANGUAGE plpgsql VOLATILE;


触发因素：


CREATE TRIGGER ins_upd_tr
BEFORE INSERT OR UPDATE ON drcschema.dr_event
FOR EACH ROW EXECUTE PROCEDURE ins_upd_func();



无法更改更新后触发器中的列。您需要一个更新前触发器OK它工作正常，但请您解释一下，当第一次插入行时，
updated\u ts
如何使用您的上述逻辑用
current\u timestamp
进行更新？我以为
TG\u OP='INSERT'
只会为
创建的
填充
当前的时间戳，其余部分将被丢弃。@MyGod:那么你想在第一次插入时填充
更新的
列吗？你上面的逻辑也是这样做的。它也在第一次插入时填充
updated\u ts
列。虽然我也希望填充它，但无法理解这个逻辑是如何实现的。这是不可能的，至少从触发器中的代码是不可能的。能否显示用于将数据插入表
drcschema.dru事件
的
INSERT
语句？