PostgreSQL源码学习删除数据#1，2

  • Z时代
  • 2024-01-10
  • 分类：综合

database

本节介绍heapam_tuple_delete和table_tuple_delete函数。

heapam_tuple_delete函数

//src/backend/access/heap/heapam_handler.c
static TM_Result
heapam_tuple_delete(Relation relation, ItemPointer tid, CommandId cid,
				Snapshot snapshot, Snapshot crosscheck, bool wait,
				TM_FailureData *tmfd, bool changingPart)
{
	/* 目前，索引元组的删除是在vacuum时处理的 */
	return heap_delete(relation, tid, cid, crosscheck, wait, tmfd, changingPart);
}

table_tuple_delete函数

//src/backend/access/heap/heapam_handler.c
static inline TM_Result
table_tuple_delete(Relation rel, ItemPointer tid, CommandId cid,
			   Snapshot snapshot, Snapshot crosscheck, bool wait,
			   TM_FailureData *tmfd, bool changingPart)
{
	/* 默认的表存储引擎的话，rd_tableam赋值为heapam_methods，
	   其tuple_delete指向的就是heapam_tuple_delete函数 */
	return rel->rd_tableam->tuple_delete(rel, tid, cid,
						 snapshot, crosscheck,
						 wait, tmfd, changingPart);
}

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