This Oracle tutorial explains how to declare a cursor in Oracle / PLSQL with syntax and examples. A cursor is a SELECT statement that is defined within the declaration section of your PLSQL code.
selectFILENUMfromzs_articles_and_enclosure wherearticlenum=num; file_rec file_cursor%ROWTYPE; begin/*嵌套开始*/ ifnotfile_cursor%isopenthen openfile_cursor; endif; while file_cursor%found loop sqlstr5:='delete from zs_attachment where filenum='''||file_rec.filenum||'''; EXECUTEIMMEDIATE ...
Cursor without parameters (simplest) The basic syntax for a cursor without parameters is: CURSOR cursor_name IS SELECT_statement; For example, you could define a cursor called c1 as below. CURSOR c1 IS SELECT course_number from courses_tbl where course_name = name_in; The result set of thi...
DECLARE my_cursor_var SYS_REFCURSOR; BEGIN OPEN my_cursor_var FOR SELECT * FROM employees; END; 复制代码 存储过程或函数的参数:在使用CREATE PROCEDURE或CREATE FUNCTION创建存储过程或函数时,需要使用DECLARE来声明输入参数和输出参数(如果有)。例如: CREATE OR REPLACE PROCEDURE my_procedure ( p_input IN ...
procedure if exists overdueBooks // create procedure overdueBooks (in memberid INT)declarereturnCheck date;declareoverdueList varchar (100) default "";declarecursor_ 浏览0提问于2020-11-02得票数0 1回答 如果表为空,则选择表名 、、、 DECLARE@Footprint VARCHAR(200)DECLAREMY_CURSORCURSORFETCH NEXT FR...
`DECLARE` 是 MySQL 中的一个语句,主要用于声明局部变量、条件、游标等。它通常用在存储过程(Stored Procedure)、函数(Function)或触发器(Trigger)中。 ...
DECLARE CURSOR Synopsis TheDECLARE CURSORcommand enables the retrieval and manipulation of records from a table one row at a time. This provides row-by-row processing, rather than the traditional set processing offered by SQL. To use this procedure properly, you should: ...
Oracle Declare语法还可以用来定义游标,游标可以用于查询数据,并对查询结果进行处理。游标的定义格式如下: Declare Cursor 游标名称 [参数列表] is SELECT语句; 其中,游标名称是用户自定义的游标名称,参数列表是可选项,用于传递参数给SELECT语句。SELECT语句用于查询数据,并返回游标结果集。 例如,下面是定义一个游标的示...
oracle procedure存储过程(pl/sql)_使用declare cursor_begin end嵌套 ... TokuDB · 特性分析 · 行锁(row-lock)与区间锁(range-lock) 简介TokuDB使用LockTree(ft-index/locktree)来维护事务的锁状态(row-lock和range-lock),LockTree的数据结构是一个Binary Tree。 本篇将通过几个“栗子”来谈谈TokuDB的...
Declare an index-by table variable to hold the employee records in cursor : Table of rowtype « PL SQL « Oracle PL / SQL