int plpgsql_recognize_err_condition(const char *condname, bool allow_sqlstate) { // 如果直接给错误码:调用MAKE_SQLSTATE拼SQLSTATE ... return MAKE_SQLSTATE(condname[0], condname[1], condname[2], condname[3], condname[4]); // 如果给的是字符串:在exception_label_map中查询后返回SQLSTAT...
typedef struct BMScanOpaqueData{ // 记录当前扫描的位置 BMScanPosition bm_currPos; bool cur_pos_valid; /* XXX: should we pull out mark pos? */ BMScanPosition bm_markPos; // bmmarkpos() -- save the current scan position. bool mark_pos_valid;} BMScan...
表触发器的创建分类 :(before | after) (INSERT | UPDATE | DELETE) (FOR EACH ROW) (WHEN NEW.? and,or OLD.? ... other boolean express ...)(before | after) (INSERT | UPDATE | DELETE | TRUNCATE) (FOR EACH STATEMENT) (WHEN BOOLEAN express except NEW or OLD or columns) 视图On views...
several types are either unique to PostgreSQL, such as geometric paths, or have several possible formats, such as the date and time types. Some of the input and output functions are not invertible, i.e., the result of
(*get_chunk_space)(MemoryContext context,void*pointer);//检查内存片段的大小bool(*is_empty)(MemoryContext context);//检查内存上下文是否为空void(*stats)(MemoryContext context,intlevel);//打印内存上下文状态#ifdefMEMORY_CONTEXT_CHECKINGvoid(*check)(MemoryContext context);//检查所有内存片段#endif}...
数据类型 名字别名描述 bigint int8 有符号的8字节整数 bigserial serial8 自动增长的8字节整数 bit [ (n) ] 定长位串 bit varying [ (n) ] varbit 变长位串 boolean bool 逻辑布尔值(真/假) box 平面上的普通方框 b
OR NOT SQL使用三值的逻辑系统,包括真、假和null,null表示"未知"。观察下面的真值表: 操作符AND和OR是可交换的,也就是说,你可以交换左右操作数而不影响结果。 2. 比较函数和操作符 常见的比较操作符都可用,如Table 9-1所示。 Table 9-1. 比较操作符 ...
The partitioned table is itself empty. A data rowinsertedinto the table is routed to a partitionbasedon the value of columnsorexpressions in the partition key. If no existing partition matches the values in the new row, an error willbereported. ...
bool mark_pos_valid; } BMScanOpaqueData; MultiExecBitmapIndexScan函数实现了Exec逻辑,主要通过调用index_getbitmap(scandesc, &bitmap)函数,获取bitmap,然后返回bitmap给上一级算子。因为示例表的索引都是btree索引,index_getbitmap指向的是btgetbitmap索引扫描函数。 btgetbitmap函数逻辑很简单:首先调用_bt_...
*/ static void produce_tuple_asynchronously(AsyncRequest *areq, bool fetch) { ForeignScanState *node = (ForeignScanState *) areq->requestee; PgFdwScanState *fsstate = (PgFdwScanState *) node->fdw_state; AsyncRequest *pendingAreq = fsstate->conn_state->pendingAreq; TupleTableSlot *result...