All access to cursors in PL/pgSQL goes through cursor variables, which are always of the special data type refcursor. One way to create a cursor variable is just to declare it as a variable of type refcursor. Another way is to use the cursor declaration syntax, which in general is: name...
DECLARE CURSOR如果使用 Transact-SQL 语法未指定READ_ONLY,OPTIMISTIC或者SCROLL_LOCKS默认值如下所示: SELECT如果语句不支持更新(权限不足、访问不支持更新的远程表等),则游标为READ_ONLY。 STATIC和FAST_FORWARD游标默认为READ_ONLY。 DYNAMIC和KEYSET游标默认为OPTIMISTIC。
CURSOR_STATUS 函数。 sp_cursor_list、sp_describe_cursor、sp_describe_cursor_tables 以及 sp_describe_cursor_columns 系统存储过程。 sp_cursor_list 和 sp_describe_cursor 的 cursor_name 输出列返回游标变量的名称。 使用cursor 数据类型创建的所有变量都可以为 Null。 对于CREATE TABLE 语句中的列,不能使用...
lv_cursor_id INTEGER;lv_columns DBMS_SQL.DESC_TAB;lv_column_count INTEGER;BEGIN-- Open Cursorlv_cursor_id := DBMS_SQL.OPEN_CURSOR;-- Parse CursorDBMS_SQL.PARSE( c => lv_cursor_id, statement => p_sql, language_flag => DBMS_SQL.NATIVE );...
Use this keyword when you use cursor variables as parameters. If value is defined as OUTPUT of a module executed against a linked server, any changes to the corresponding @parameter performed by the OLE DB provider are copied back to the variable at the end of the execution of module. If ...
The delete operation occurs at the current position of the cursor. This can be more accurate than a searched DELETE statement that uses a WHERE search_condition clause to qualify the rows to be deleted. A searched DELETE statement deletes multiple rows if the search condition does not uniquely...
DISTINCT Clause in Cursor SELECT. Distinct count with multiple columns distinct vs group by performance wise Divide time into Morning , After noon , Evening and Night Do I need to INCLUDE the primary key in an index or not? Do not select the last row Does anyone know how to find a perio...
AI_FUNCTION_HTTP_PARSE_CAST_ERROR、AI_FUNCTION_HTTP_PARSE_COLUMNS_ERROR、AI_FUNCTION_MODEL_SCHEMA_PARSE_ERROR、CANNOT_PARSE_JSON_FIELD、FAILED_ROW_TO_JSON、INVALID_JSON_DATA_TYPE、INVALID_JSON_DATA_TYPE_FOR_COLLATIONS 22525 分割索引鍵值無效。 DELTA_PARTITION_COLUMN_CAST_FAILED 22531 內建或系統提供...
因為同樣的原因,sys.dm_xe_objects sys.dm_xe_object_columns 也會傳回資料列。 擴充事件 DMV 的名稱前置詞是: sys.dm_xe_* 是SQL Server 上的名稱前置詞。 sys.dm_xe_database_* 通常是 SQL Database 的名稱前置詞。 權限: 若要從系統檢視表 SELECT,必須有下列權限︰ Microsoft SQL Server 為 VIEW SERV...
SQL_ATTR_USE_BOOKMARKS語句屬性已設定為 SQL_UB_VARIABLE,且SQL_ATTR_CURSOR_TYPE語句屬性已設定為驅動程式不支援書籤的數據指標類型。 HYT00逾時已過期在數據源傳回結果集之前過期的逾時期限。 逾時期間是透過SQLSetStmtAttr設定,SQL_ATTR_QUERY_TIMEOUT。