Possible Duplicate:
Insert, on duplicate update (postgresql)
在PostgreSQL:
insert record, if the record doesn t exists
else update existing record
假定记录将插入本表结构:
[userid - unique] [count]
如果有现有记录,我将只更新计数,如果计数不存在,我将插入。
您必须在 PostgreSQL 中写入此功能, 因为不存在类似 Mysql s < a href=" http://dev. mysql.com/doc/refman/ 5.0/ en/ Infreed- on- duprecy. html" rel=“ nofollow” >INSTERT... on DUPLIATE KEY UPDATE 的功能。 请查看 PostgreSQL 官方文件 < a href=> http://www. postgresql.org/docs/ puticatic/plpgsql- controducts.html# PLPGSQL- UPSERT- EXAMPLE" rel=“ nofol> this 函数 PostgreSQL 官方文件 。
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