PostgreSQL中的ON CONFLICT DO UPDATE 1. 用途 在PostgreSQL中,ON CONFLICT DO UPDATE是INSERT语句的一个子句,用于处理唯一性约束(如主键或唯一索引)的冲突。当尝试插入的数据违反了这些约束时,PostgreSQL允许通过ON CONFLICT子句来定义一种替代操作,而不是简单地回滚整个插入操作。这使得数据插入操作更加灵活,能够在冲突...
描述 针对数据写入时有主键冲突的情况,INSERT ON CONFLICT语法可以将冲突主键的INSERT行为转换为UPDATE行为,从而实现冲突主键的覆盖写入。该特性又称UPSERT覆盖写,与MySQL的REPLACE INTO类似。 [ WITH [ RECURSIVE ] with_query
INSERTINTOmeta_data (user_id,file_name, file_path, UPDATE_TIME )VALUES('user_id02','file_name02','/usr/local/file_name03', now())ONCONFLICT (user_id,file_name) DOUPDATESETfile_path=EXCLUDED.file_path, UPDATE_TIME=EXCLUDED.UPDATE_TIME; postgres=#select*frommeta_data; id|user_id|file...
postgres=# insert into t values (1,'test',now()) on conflict (id) do update set info=excluded.info,crt_time=excluded.crt_time returning xmax; xmax 0 (1 row) INSERT 0 1 postgres=# insert into t values (1,'test',now()) on conflict (id) do update set info=excluded.info,crt_tim...
To insert a new user or update an existing one based on the id: Code: INSERT INTO users (id, name, email) VALUES (1, 'Abiola Updated', ‘abiola.new@example.com') ON CONFLICT (id) DO UPDATE SET name = EXCLUDED.name, email = EXCLUDED.email; ...
使用INSERT INTO ... ON DUPLICATE KEY UPDATE语句：如果您的PostgreSQL版本不支持ON CONFLICT DO UPDATE...
postgres=# select*from decoding_test;x|y---+---12|9101|20--插入时发生主键冲突,执行后面的update语句,将y更新为400,EXCLUDED表示准备要新插入的这一行数据。 postgres=#INSERTINTOdecoding_test(x,y)values(101,400)onconflict(x)doupdatesety=EXCLUDED.y;INSERT01postgres=# select*from decoding_test;x...
在PostgreSQL中,可以使用INSERT ... ON CONFLICT ... DO UPDATE语句来实现upsert操作,具体语法如下: INSERT INTO table_name (column1, column2, ...) VALUES (value1, value2, ...) ON CONFLICT (conflict_target) DO UPDATE SET column1 = value1, ...
insert into upsert_test (id, name) values (1, 'hello'); select *, xmax from upsert_test; 做没有效果的促销活动。观察xmax在每次执行时(意外)递增: insert into upsert_test (id, name) values (1, 'hello') on conflict on constraint upsert_test_pkey do update ...
PostgreSQL INSERT ON CONFLICT不存在则插入,存在则更新 1、不存在则插入,存在则更新 insertintotestvalues(1,'test',now())onconflict (id) doupdatesetinfo=excluded.info,crt_time=excluded.crt_time; 执行操作:INSERT01查看结果:select*fromtest;