第一次写这个程序时,出现一种问题,windows报错如下所示:
Windows has triggered a breakpoint in ThreadTest.exe.
This may be due to a corruption of the heap, which indicates a bug in ThreadTest.exe or any of the DLLs it has loa…
//主键
alter table tabelname add new_field_id int(5) unsigned default 0 not null auto_increment ,add primary key (new_field_id);
//删除列
alter table t2 drop column c;
//重命名列
alter table t1 change a b integer; //改变列的类型
alter table t1 change…
The following example allocates and then frees a two-dimensional array of characters of size dim by 10. When allocating a multidimensional array, all dimensions except the first must be “constant expressions” that evaluate to positive values; the leftmos…
1.删除用户下的所有内容:drop user xxx cascade; 2.删除表空间:drop tablespace AA including contents; 3.查看当前用户默认表空间:select * from user_users 4.查看、修改表空间大小:select * from dba_data_files where…
C的new和delete剖析 C在new和delete的时候到底在干些什么? 今天写了一个小程序测试一下C在new和delete的时候到底在干些什么。 int g_num 3; class A { public: int value; A(int a):value(a){cout<<"A("<<a<<") called…
http://macfidelity.de/2009/05/17/mac-limit-bandwidth-in-mac-os-x-using-ipfw/index.html Ever wondered if it’s possible to limit your bandwidth in Mac OS X without installing additional software ? Yes it is Basically you just need some terminal and IPFW …
查询及删除重复记录的方法大全 1、查找表中多余的重复记录,重复记录是根据单个字段(peopleId)来判断 select * from people where peopleId in (select peopleId from people group by peopleId having count(peopleId) > 1) 2、删除表…
本文实例,运行于 MySQL 5.0 及以上版本。 MySQL 赋予用户权限命令的简单格式可概括为:
grant 权限 on 数据库对象 to 用户一、grant 普通数据用户,查询、插入、更新、删除 数据库中所有表数据的权利。
grant select on testdb.* to comm…
第7章内存管理欢迎进入内存这片雷区。伟大的Bill Gates 曾经失言:640K ought to be enough for everybody— Bill Gates 1981程序员们经常编写内存管理程序,往往提心吊胆。如果不想触雷,唯一的解决办法就是发现所有潜伏的地雷并且排除它们&am…
今早备份Oracle10g数据库的时候,出现以下错误: ORA-19815: WARNING: db_recovery_file_dest_size of 2147483648 bytes is 100.00% used, and has 0 remaining bytes available. ************************************************************* You have the fol…
脚本分为这么几个部分: 1. stop and delete RAC instance, drop the database 2. stop and delete ASM instance 3. stop and delete listener 4. stop crs stack and clean related resource 5. clean ocr context 6. change permission and remove related ORACLE…
VC数据类型转换大全 int i 100;long l 2001;float f300.2;double d12345.119;char username[]"程佩君";char temp[200];char *buf;CString str;_variant_t v1;_bstr_t v2;一、其它数据类型转换为字符串短整型(int)itoa(i,temp,10);///将i转换为字符串放入temp中,最…
说明:
1. 此文档基于 linux 2.6.32,TQ2440上测试通过,
2. arm-linux-gcc版本
Thread model: posix gcc version 4.3.3 (Sourcery G Lite 2009q1-203)
一. 问题描述及追踪分析
使用 rmmod时候发现如下错误
rmmod chdir no such file or directory…
删除记录 MySQL允许使用delete和truncate语句删除数据。 DELETE语句可以允许从表中删除记录,支持where, DELETE FROM TABLE_NAME WHERE CONDITIONAL; 如果没有where子句,则删除表中所有数据。该操作不可逆转(除非使用的是InnoDB表…
GRANT 语句的语法如下:GRANT privileges (columns)ON whatTO user IDENTIFIEDBY "password"WITH GRANT OPTION对用户授权mysql>grant rights on database.* to userhost identified by "pass";例1:增加一个用户test1密码为abc,让…
十分简单...There is a way to change entries of a table with SE16 even if you dont have the authorization: Go in SE16, enter your table Name (ex: MARA). Display the entry (or entries) you want to modify. When you have your entry, write /H to go in debug mod…
创建数据库表后,然后删除,提示有重复的对象,需排序,压缩。无法传输,解决方法如下: choose the request,then request/Task-object list-sort and compress,you can delete it now
User Mode Driver介绍 Windows CE 6.0中引入了User Mode Driver的概念,可是无论是网上,还是各个芯片厂商提供的方案中,都很少提及这方面的内容。 本文以小郭对存储管理和User Mode Driver Host的理解为基础,结合具体的代码实现&am…
delete from tablename where 條件 delete 和truncate作用其實是一樣的,隻是truncate后面不跟where條件句,它的作用是 刪除表中所有的行(記錄) 兩者最大的區別就是delete是寫日誌文件的,而truncate則不寫日誌直接刪除,前者可 恢復,而后者無法恢復,后者的危險性更高,所以一般不建…
if not exists (select * from dbo.sysobjects where id object_id(N[dbo].[tablespaceinfo]) and OBJECTPROPERTY(id, NIsUserTable) 1) create table tablespaceinfo --创建临时表 (nameinfo varchar(50) , --表名 rowsinfo int , --表中现有的行数 reserved varchar(20) ,…
delete()方法的使用:SQLiteDatabase db databaseHelper.getWritableDatabase();
db.delete("person", "personid<?", new String[]{"2"});
db.close();上面代码用于从person表中删除personid小于2的记录。update()方法的使用&am…
对于codeigniter的增删改,在此我用自己的一个例子来说明一下: 创建数据库: CREATE TABLE IF NOT EXISTS users (id int(10) NOT NULL AUTO_INCREMENT,username varchar(50) NOT NULL,password varchar(50) NOT NULL,email varchar(100) NOT N…
一、原题 Evaluate the following DELETE statement: DELETE FROM sales; There are no other uncommitted transactions on the SALES table. Which statement is true about the DELETE statement? A. It would not remove the rows if the table has a primary key. B. It…
1、查找表中多余的重复记录,重复记录是根据单个字段(peopleId)来判断select * from peoplewhere peopleId in (select peopleId from people group by peopleId having count(peopleId) > 1)
2、删除表中多余的重复记录ÿ…
perl 函数集(二)四、标量转换函数五、数组和列表函数六、关联数组函数四、标量转换函数 函数名chop调用语法$lastchar chop (var);解说var可为变量或数组,当var为变量时,最后一个字符被删除并赋给$lastchar,当var为数…
我决定在这写下自己每天获得的知识,有空可以当作翻翻的依据。内容尽管很杂。
SVG是一种用XML定义的语言,用来描述二维矢量及矢量/栅格图形。 enum QIODevice::OpenModeFlag flags QIODevice::OpenMode This enum is used with open() to describe the m…
http://www.vcworld.net/news/200910/114918.html 欢迎进入内存这片雷区。伟大的Bill Gates 曾经失言: 640K ought to be enough for everybody — Bill Gates 1981
程序员们经常编写内存管理程序,往往提心吊胆。如果不想触雷,唯一的解决…
当你在某个缓存中存储数据时,常常需要在运行时调整该缓存的大小,以便能容纳更多的数据。
下面是一个增加初始缓存大小的例子: 仔细琢磨一下........ // console.cpp : Defines the entry point for the console application.//#include &quo…
一)1、查找表中多余的重复记录,重复记录是根据单个字段(peopleId)来判断select * from peoplewhere peopleId in (select peopleId from people group by peopleId having count(peopleId) > 1) 2、删除表中多余的重复记录&#…
一.FLASHBACK QUERY--闪回到15分钟前 select * from table_name as of timestamp (systimestamp - interval 15 minute) where ...... 这里可以使用DAY、SECOND、MONTH替换minute,例如: SELECT * FROM table_name AS OF TIMESTAMP(SYSTIMESTAMP - INTERV…
什么是savepoint?Use the SAVEPOINT statement to identify a point in a transaction to which you can later roll back.例如: SQL> SELECT * FROM SCOTT.DEPT ;DEPTNO DNAME LOC------ -------------- -------------10 ACCOUNTING NEW YORK20 …
转自http://ktcheong.spaces.live.com/blog/cns!72B9F5204F2D5FF2!312.entry
VMware ESX 3.0 VM Backup script by Tooms I was looking around the internet for a backup script to backup the VM guests on a standalone ESX 3.0 and was not finding any so I start to ma…
1.下面这段代码考察变量的作用域问题。 #include<iostream>
using namespace std;void other()
{static int a 2;static int b;int c 10;a 2;c 5;cout<<"----other-----"<<endl;cout<<a<<" "<<b<<" &q…
Oracle数据库:数据库操纵语言DML,插入insert into where,更新update where,删除delete where
2022找工作是学历、能力和运气的超强结合体,遇到寒冬,大厂不招人,可能很多算法学生都得去找开发&a…
关于透明桥接的论述The Linux bridge code implements a subset of the ANSI/IEEE 802.1d standard.The code for bridging has been integrated into 2.4 and 2.6 kernel series.enable bridging in the kernel.make menuSet "networking -> 802.1d Ethernet Bridging…
1. 检查数据库模式: sqlplus /nolog conn /as sysdba archive log list (查看数据库是否处于归档模式中) 若为非归档,则修改数据库归档模式。 startup mount alter database archivelog alter database open 2.连接到target数据库 命令ÿ…
一、原题 Evaluate the following SQL statements: DELETE FROM sales; There are no other uncommitted transactions on the SALES table. Which statement is true about the DELETE statement? A. It removes all the rows as well as the structure of the table B. It …
MicrosoftSQL Server 2008将包含用于合并两个行集(rowset)数据的新句法。根据一个源数据表对另一个数据表进行确定性的插入、更新和删除这样复杂的操作,运用新的MERGE语句,开发者只需使用一条命令就可以完成。
在对两个表进行信息同步时,有…
http://blog.csdn.net/v_july_v/article/details/6630757
从上面博客中获取的算法,编译测试通过 void testMake1000WRand(){const int size 10000000;int *num new int [size];int n;FILE *fp fopen("F:\\rasterTest\\data.txt", "w");asse…
创建操作日志字典 -------------------------------------------------------------Susue--------- 如表已存在,先删除--if exists(select 1 from sysobjects where nameS_LOG and XtypeU) drop table S_LOG ;go--------- 建新表和主键create table S_LOG ( P_ID int IDENTIT…
功能描述:根据文件描述词来操作文件的特性。 用法: int fcntl(int fd, int cmd); int fcntl(int fd, int cmd, long arg); int fcntl(int fd, int cmd, struct flock *lock); 参数: fd:文件描述词。 cmd:操作命令。…
转自http://java.mblogger.cn/flowercat/1.删除表空间 DROP TABLESPACE TableSpaceName [INCLUDING CONTENTS [AND DATAFILES]]
2.删除用户 DROP USER User_Name CASCADE
3.删除表的注意事项 在删除一个表中的全部数据时ÿ…
*& 手工更改采购订单项目里发票标签下的最终交货复选框 report zmmr0191 message-id zfd_01. tables:ekpo. data:begin of it_ekpo occurs 0, ebeln like ekko-ebeln, ebelp like ekpo-ebeln, wemng like eket-wemng, menge like ekpo-menge, invoiced_menge like ekbe-men…
常用数据类型使用转换详解作者:程佩君读者层次:初学刚接触VC编程的朋友往往对许多数据类型的转换感到迷惑不解,本文将介绍一些常用数据类型的使用。我们先定义一些常见类型变量借以说明int i 100;long l 2001;float f300.2;double d12345.1…
MySQL sql_safe_updates 分析
我在练习MySQL操作语句时,使用一条完全没有错误的语句:
update students set namedrake where namechuan; 却报了如下错误:
Error Code: 1175. You are using safe update mode and you tried to update a ta…
declare max integer,id integerdeclare cur_rows cursor local for select 主字段,count(*) from 表名 group by 主字段 having count(*) > 1 open cur_rows fetch cur_rows into id,max while fetch_status0 begin select max max -1 set rowcount max delete from 表名 …
二. 虚函数的语法 虚函数的标志是“virtual”关键字。
2.1 使用virtual关键字 考虑下面的类层次:
class A{public:virtual void foo();};
class B: public A{public:void foo(); // 没有virtual关键字!};
class C: public B // 从B继承,不是…
C对象模型之一 关于对象笔记前言 <<Inside The C Object Model>>Stanley B.Lippman著;中文版《深度探索C对象模型》侯捷翻译。看到大家都认为是本好书,所以从Chinapub中购买会来。看了一遍后觉得昏昏沉沉,主要是很琐碎,其中此书有…
一、原题 Which two statements are true regarding the DELETE and TRUNCATE commands? (Choose two.) A. DELETE can be used to remove only rows from only one table at a time. B. DELETE can be used to remove only rows from multiple tables at a time. C. DELETE …
一、原题 View the Exhibit and examine the description for the PRODUCTS and SALES table.PROD_ID is a primary key in the PRODUCTS table and foreign key in the SALES table. You want to remove all the rows from the PRODUCTS table for which no sale was done fo…
一、原题 View the Exhibit and examine the description of SALES and PROMOTIONS tables. You want to delete rows from the SALES table, where the PROMO_NAME column in the PROMOTIONS table has either blowout sale or everyday low price as values. Which DELETE …
/****************************
v_index 为主键语句
tablename 为表名
written by:wonder
modified by:
****************************/CREATE OR REPLACE PROCEDURE prc_delete(v_index IN VARCHAR2, tablename IN VARCHAR2) IS v_sql VARCHAR2(2000); v_sql1 V…
/*delete add find */
public class ArrayTest {/*** param args*//*定义数组大小*/private static int COUNT40;public static int[] arrnew int[COUNT];/*定义当前数组的个数,为了和下标统一,以0开头*/private int currentNumber0;public ArrayTest(){…
很多老外公布出来的算法代码常常是在Linux下实现的。很多时候会遇到动态数组定义。
举个二维数组的例子:
Graph::node_id node[height][width];
这是C99[6 ]标准中新添加的特性[3 ,4 ,5 ]。 C99 gives C programmers the ability to use variable length arrays…
new 和delete 是运算符,而不是函数。
new
new 运算符的格式: new 类型[初值]; new int; ///开辟一个存放整数的存储空间,返回一个指向该存储空间的地址 new int(100); ///开辟存放一个整数的存储空间,并指定该整数…