pg_lo_seek说明bool pg_lo_seek ( resource large_object, int offset [, int whence] )pg_lo_seek() 在大型对象资源中移动指针位置。whence 参数为 PGSQL_SEEK_SET,PGSQL_SEEK_CUR 或 PGSQL_SEEK_END。 参见 pg_lo_tell()。
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