如何更新记录，否则在 postgresql 中插入记录

Question

如何在同一个查询中执行更新和插入？我需要更新记录，如果它不存在那么它必须执行插入我试过这个

UPDATE bank SET  Address= $2,"PANCard"= $3,"IFSC" = $4  WHERE user_id = $1;
INSERT INTO bank (user_id,bank_details,"PAN",bank_acc,"UAN",tax)
       SELECT  '$2','$3','$4','$5','$6'
       WHERE NOT EXISTS (SELECT * FROM bank WHERE user_id=$1);

但我越来越

{
  "name": "error",
  "length": 123,
  "severity": "ERROR",
  "code": "42601",
  "file": "postgres.c",
  "line": "1274",
  "routine": "exec_parse_message"
}

请在这里帮助我

Answer 1

您可以使用 UPSERT：

https://www.postgresql.org/docs/9.5/static/sql-insert.html

文档中的示例：

INSERT INTO distributors (did, dname)
VALUES (5, 'Gizmo Transglobal'), (6, 'Associated Computing, Inc')
ON CONFLICT (did) DO UPDATE SET dname = EXCLUDED.dname;