procedure:存储过程 eg: create or replace procedure p --这儿是和plsql的区别 is cursor c is select * from emp2 for update; --v_temp c%rowtype; begin for v_temp in c loop
Description The Oracle/PLSQL TO_CHAR function converts a number or date to a string.将数字转换为日期或字符串 Syntax TO_CHAR( value [, format_mask] [, nls_language] ) Parameters or Arguments Value A number or date that will be converted to a string. format_mask O
Description The Oracle/PLSQL COUNT function returns the count of an expression. The COUNT(*) function returns the number of rows in a table that satisfy the criteria of the SELECT statement, including duplicate rows and rows containing null values in
Description The Oracle/PLSQL NVL function lets you substitute a value when a null value is encountered. NVL函数是当出现空值时替换一个值 Syntax NVL( string1, replace_with ) String1 The string to test for a null value. replace_with The value returned if string1 is n
TECHONTHENNTE WEBSITE: https://www.techonthenet.com/oracle/functions/to_char.php Oracle / PLSQL: TO_CHAR Function This Oracle tutorial explains how to use the Oracle/PLSQL TO_CHAR function with syntax and examples. Description The Oracle/PLSQL TO_CH
lua的corroutine学习 function receive (prod) local status, value = coroutine.resume(prod) return value end function send (x) coroutine.yield(x) end function producer () return coroutine.create( function () while true do local x = io.read() send(x) end en
Namespaces In most programming languages we know the concept of namespaces (or packages).Namespaces allow us to group code and help us to avoid name-collisions. In c# for example you have this declaration ? namespace MyNameSpace { public class My
一个关于协同程序的经典示例就是“生产者-消费者”的问题. 一个不断产生值,一个不断消费这些值.比如: function producer() while true do local x = io.read() --produce new value send(x) --send it to consumer end end function consumer() while true do local x = receive() --receive value from producer io.
Lua 5.3 协程简单示例 来源 http://blog.csdn.net/vermilliontear/article/details/50547852 生产者->过滤器->消费者 模式的协程示例 function receive(prod) local status, value = coroutine.resume(prod) return value end function send(x) coroutine.yield(x) end function producer() ret
LAST UPDATE: 1 Dec 15, 2016 APPLIES TO: 1 2 3 4 Oracle Database - Enterprise Edition - Version 7.0.16.0 and later Oracle Database - Standard Edition - Version 7.0.16.0 and later Oracle Database - Personal Edition - Version 7.1.4.0 and later I
生产者和消费者问题:当协程调用yield时,从一个悬而未决的resume中返回.简单的协程练习: function receive() local status,value = coroutine.resume(producer) return status,value end function send(x) coroutine.yield(x) end producer = coroutine.create( function() local x = while true do x = x+
按照书上码了下,但运行有问题,暂时不知道原因: function send (x) coroutine.yield(x) end function producer() return coroutine.create( function () while true do local x = 1 send(x) end end) end function receive(prod) local status, value = coroutine.resume(prod) return value
一个关于协同程序的经典示例是“生产者-消费者”问题.这其中涉及到两个函数,一个函数不断地产生值(比如从一个文件中读取值),另一个则不断地消费这些值(比如将这些值写到另一个文件).通常,这两个函数大致是这样的: function producer () while true do local x = io.read() -- 产生新的值 send(x) -- 发送给消费者 end end function consumer () while true do local x = receive()
