5、open cursor后要注意close cursor declare--存储域名type t_curisrefcursor; domainNames t_cur; domainNamevarchar2(50) :='';--存储每个域下的网元类型cursormoTypeNames(domainVARCHAR2)ISselectt1.modelnamefrompm4h_mo.mdl_resmodel t1,pm4h_mo.mdl_domain t2wheret2.domainname=domainandt1.domainid=...
SELECT CONCAT(first_name,'2') FROM stu;-- 当fetch游标到了数据库表格最后一行的时候,设置done=1。 DECLARE CONTINUE HANDLER FOR SQLSTATE'02000'SET done=1;--错误标记处理,放到最后再声明,要放到游标后面。--不然会报错:Variable or condition declaration after cursor or handler declaration DECLARE CONTINUE...
游标Cursor逻辑运算符和物理运算符用于描述涉及游标操作的查询或更新的执行方式。 其中物理运算符描述用于处理游标(如使用键集驱动游标)的物理实现算法。 游标执行过程的每一步都涉及物理运算符。 而逻辑运算符描述游标的属性,如游标是只读。 逻辑运算符包括Asynchronous、Optimistic、Primary、Read Only、Scroll Locks、...
注意 SQL Server データ型が前の表に表示されない場合、そのデータ型はサポートされていません。次の例を含むサポートされていないデータ タイプ: binary()、varbinary()、image、cursor、rowversion、hierarchyid、sql_variant xml、空間ジオメトリ型、空間地域型、テーブル。
If you currently use another database management system (DBMS), you can migrate to Microsoft SQL Server. Migrating from another DBMS to SQL Server involves transferring not only the data stored in the DBMS, but the databases and tables that hold the data, and other objects that interact with...
If for some reason, we want to return cursor* to the client, the order of the cursor elements may differ depending on the collation and the encoding of the sorted column(s). Note: A query with a presentation ORDER BY clause i.e. the one that is not coupled with the TOP clause, ret...
Under the Locks event in SQL Server Profiler, the BigintData1 column provides the lock partition ID for a lock partitioned resource. Working with Lock Partitioning The following code examples illustrate lock partitioning. In the examples, two transactions are executed in two different sessions in ...
SQL Server 2017 adjusts memory grants based on execution feedback, removes spills to disk, and improves concurrency for repeating queries. Batch mode adaptive joins Adaptive joins dynamically select a better internal join type (nested loop joins, merge joins or hash joins) during...
(password, "Dmsys_123"); strcpy(servername, "192.168.0.89:5289"); EXEC SQL WHENEVER SQLERROR DO sql_error("DM error--"); EXEC SQL CONNECT :username IDENTIFIED BY :password USING :servername; printf("\nConnected to dm as user: %s\n", username); /* Declare a cursor for the FETCH...
如果你有用过MySQL这些关系型数据库,一定听说过游标(cursor),也用过各种编程语言的JDBC Driver的getNext(),通过这样的方式来每次获取SQL执行结果的一部分数据。Presto提供的类似机制是Query提交后,它会给到SQL客户端一个QueryResult,其中包含一个nextUri。对于某个Query,每次请求QueryResult,都会得到一个新的nextUri,...