Learn what is Cursor in SQL with the help of examples. SQL cursor is a database object that is used to manipulate and traverse the result set of a SELECT query.
ASQL Server cursoris T-SQL logic to loop through a finite number of rows which are determined by the query that is used to load the cursor. Cursors are mainly used to perform sequential operations on the rows. The cursor can be viewed as a data set or a list of data which can be l...
0 BEGIN SELECT @cmd = 'IF NOT EXISTS (SELECT top 1 * FROM Map WHERE [' + @col + '] IS NOT NULL) BEGIN INSERT INTO #Results select ''' + @col + ''' end' EXEC SP_EXECUTESQL @cmd FETCH NEXT FROM getinfo into @col END CLOSE getinfo DEALLOCATE getinfo select * from #Results...
SQL Server 2012 Service Pack 3SQL Server 2014 Developer - duplicate (do not use)SQL Server 2014 Enterprise - duplicate (do not use)SQL Server 2014 Standard - duplicate (do not use) Symptoms Assume that you create a stored procedure that uses a cursor on a table variable in Microsoft SQL ...
open cursor---> parse---> bind variable---> execute---> close cursor; 对于delete操作只需要进行以下几个步骤: open cursor---> parse---> execute---> close cursor; 利用DBMS_SQL执行DDL语句: 1 2 3 4 5 6 7 8 9 10 CREATEORREPLACEPROCEDURECreateTable2 (tablename VARCHAR2) ...
--方法一:CREATE OR REPLACE FUNCTION count_sql( p_sql IN CLOB )RETURN INTEGERASlv_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...
With ODBC, avoid the Transact-SQL statement EXECUTE, instead specify the name of the procedure directly. When executing the procedure from a Transact-SQL batch or another stored procedure, avoid using a cursor with the natively compiled stored procedure. When creating a natively compiled stored ...
隐式事务是其中用户或应用程序不显式发出发出 T-SQL 语句之前在 BEGIN TRANSACTION 语句。但是的到数据库的所有更改必须都将事务,存储引擎将自动启动在底层事务。T-SQL 语句完成时, 存储引擎将自动提交它启动地环绕该用户的语句的事务。 您可能认为这是不必要因为单个的 T-SQL 语句不会生成大量的更改在的数据库的...
Covers the reason why SQL Server Migration Assistant (SSMA) for Oracle cannot convert some of the statements that have cursor as a return type in any function - error message O2SS0245.
File "bug.py", line 35, in <module> create_db(0) File "bug.py", line 21, in create_db cursor.execute(sql) File "C:\Python27\lib\site-packages\pymysql\cursors.py", line 166, in execute result = self._query(query) File "C:\Python27\lib\site-packages\pymysql\cursors.py", lin...