在我的PLSQL块中可能存在多个DML语句的情况下,我一直在寻找一种通用方法,该方法可以计算出受此代码块影响的行总数。
测试数据和结构以供参考:
create table cust_temp_a
(Name varchar2(100), id varchar2(100));
insert into cust_temp_a VALUES
('Hasu','10');
insert into cust_temp_a VALUES
('Aasu','20');
insert into cust_temp_a VALUES
('Basu','30');
insert into cust_temp_a VALUES
('Casu','10');
commit;
create table cust_temp_b
(Name varchar2(100), id varchar2(100));
insert into cust_temp_b VALUES
('Hasu','10');
insert into cust_temp_b VALUES
('Aasu','20');
insert into cust_temp_b VALUES
('Basu','30');
insert into cust_temp_b VALUES
('Casu','20');
commit;
可能存在多个这样的表,
下面是PLSQL块,可以记录不受影响的行:
DECLARE
affected_count_a number;
affected_count_b number;
total_affected_count number;
PROCEDURE proc(affected_count_a OUT number,affected_count_b OUT number) IS
BEGIN
update cust_temp_a set name = 'new_val' where id = 10;
affected_count_a:=sql%rowcount;
update cust_temp_b set name = 'new_val' where id = 20;
affected_count_b:=sql%rowcount;
END;
BEGIN
proc(affected_count_a,affected_count_b);
total_affected_count:=affected_count_a+affected_count_b;
dbms_output.put_line('total_affected_count : ' || total_affected_count );
dbms_output.put_line('affected_count_a : ' || affected_count_a);
dbms_output.put_line('affected_count_b : ' || affected_count_b );
END;
/
commit;
结果:
total_affected_count : 4
affected_count_a : 2
affected_count_b : 2
“ proc”过程中可能存在多个DML语句,我想执行某种通用方法来记录每个DML语句的单独计数,最后汇总受“ proc”影响的计数。
每次都添加DML语句并将相应的变量添加到日志计数是很痛苦的事情。
答案 0 :(得分:2)
您可以使用通用过程将计数记录在通用日志表中。
记录表
CREATE TABLE dml_logs (
log_id NUMBER PRIMARY KEY,
step VARCHAR2(200),
row_count NUMBER,
log_date DATE
);
ID序列
create sequence seq_dml_logs ;
记录过程
CREATE OR REPLACE PROCEDURE log_dml (
p_step VARCHAR2,
p_row_count NUMBER,
p_log_date DATE
) IS
PRAGMA autonomous_transaction;
BEGIN
INSERT INTO dml_logs (
log_id,
step,
row_count,
log_date
) VALUES (
seq_dml_logs.NEXTVAL,
p_step,
p_row_count,
p_log_date
);
COMMIT;
END;
/
具有DML的PL / SQL块
DECLARE
v_step dml_logs.step%TYPE;
BEGIN
v_step := 'cust_temp_a_update';
UPDATE cust_temp_a SET name = 'new_val' WHERE id = 10;
log_dml(v_step,SQL%ROWCOUNT,SYSDATE);
v_step := 'cust_temp_b_update';
UPDATE cust_temp_b SET name = 'new_val' WHERE id = 20;
log_dml(v_step,SQL%ROWCOUNT,SYSDATE);
END;
/
然后,聚合很简单。
select SUM(row_count) FROM dml_logs
where step = ? and log_date = ? -- all the required conditions.
为了更好地识别记录是属于特定运行还是批次,您可以在dml_logs
中添加另一列,称为 batch_number
。记录此数字以标识dml的唯一运行,并且获取汇总详细信息的查询变得简单得多。