三、DECLARE CURSOR WITH PARAMETER USE FOR..LOOP DECLARE CURSOR cur_para(id varchar2) IS SELECT books_name FROM books WHERE books_id=id; BEGIN DBMS_OUTPUT.PUT_LINE('***'); FOR cur IN cur_para('0001') LOOP --FOR LOOP, NO NEED TO DECLARE THE cur. DBMS_OUTPUT.PUT_LINE(cur.books_n...
As the name suggests Cursor For Loop is a type of For loop provided by oracle PL/SQL which makes working with cursors in oracle database a lot easier by executing OPEN, FETCH & CLOSE Cursor statements implicitly in the background for you....
此外,另一种使用FOR LOOP的Implicit Cursor使用方法。 Every time you run either a SQLDML statement or a PL/SQLSELECTINTOstatement, PL/SQL opens animplicit cursor. You can get information about this cursor from its attributes, but you cannot control it. After the statement runs, the database cl...
此外,另一种使用FOR LOOP的Implicit Cursor使用方法。 Every time you run either a SQL DML statement or a PL/SQLSELECTINTO statement, PL/SQL opens animplicit cursor. You can get information about this cursor from its attributes, but you cannot control it. After the...
问oracle open cursor with字符串变量出现错误EN介绍oracle cursor(游标)之前先，介绍一下oracle的库缓存...
2.CURSOR FOR LOOP,用于for in loop语句for 游标变量 in 游标 loop end loop;用于静态游标中,不能用于动态游标,且不需要显示的打开、关闭、取数据、测试数据的存在、定义数据的变量等等。举例: 游标FOR循环,简化游标操作my_dept_rec不需要声明 declare
CommandType.StoredProcedure cmd.Parameters.Add(NewOracleParameter("N_EMPNO", OracleType.Number)).Value =7369cmd.Parameters.Add(NewOracleParameter("IO_CURSOR", OracleType.Cursor)).Direction = ParameterDirection.Output rdr = cmd.ExecuteReader()While(rdr.Read())REMdosomethingwiththe valuesEndWhile...
CURSOR cursor_name [(parameter[, parameter]...)][RETURN return_type] IS select_statement; wherereturn_typemust represent a record or a row in a database table, andparameterstands for the following syntax: cursor_parameter_name [IN] datatype [{:= | DEFAULT} expression] ...
l打开游标:就是执行游标所对应的SELECT语句,将其查询结果放入工作区,并且指针指向工作区的首部,标识游标结果集合。如果游标查询语句中带有FOR UPDATE选项,OPEN语句还将锁定数据库表中游标结果集合对应的数据行。 格式: OPENcursor_name[([parameter =>]value[, [parameter =>]value]…)]; ...
高版本游标(Version Count)是指一个父游标下存在多个子游标,每个子游标对应不同的执行计划。高版本游标会导致数据库性能下降,甚至引发故障。常见原因包括优化器模式不匹配、绑定变量不匹配等。通过配置事件10503、修改隐含参数"_cursor_obsolete_threshold"等方法,可以