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RSS订阅原创 Angular-JS初见
!DOCTYPE html>html>head>meta charset="utf-8">script src="http://apps.bdimg.com/libs/angular.js/1.4.6/angular.min.js">/script>/head>body>div ng-app=""><!--div 是anjs的所有着--> p>名字 :
2016-02-05 14:13:41
337
转载 拿来老外的 layoutSubviews
init does not cause layoutSubviews to be called (duh) addSubview: causes layoutSubviews to be called on the view being added, the view it’s being added to (target view), and all the subviews of
2015-06-10 16:53:51
391
原创 sql 标量子查询
返回结果只有一行的查询叫标量子查询.SELECT shohin_mei shohin_bunrui FROM Shohin WHERE hanbai_tanka > (SELECT AVG(hanbai_tanka) FROM Shohin);标量子查询可以和列一样mysql> SELECT shohin_id ,shohin_mei,shohin_bunrui,\
2015-03-02 18:19:59
6451
原创 sql VIEW
mysql> CREATE VIEW ShohinSum (shohin_bunrui,cnt_shohin)\ -> AS\ -> SELECT shohin_bunrui,COUNT(*) \ -> FROM Shohin \ -> GROUP BY shohin_bunrui;mysql> SELECT shohin_b
2015-03-01 18:33:51
349
原创 sql 事务
UPDATE Shohin SET torokubi = '2009-09-01';START TRANSACTIONCOMMIT;ROLLBACK;DELETE FROM Shohin;---清空表数据
2015-03-01 18:32:37
310
原创 sql 排序
SELECT hanbai_tanka,shiire_tanka FROM Shohin ORDER BY hanbai_tanka ASC,shiire_tanka ASC;DESC ASC 修饰不同的列.含有NULL的会在开头或者结尾汇总，因为NULL是不能运算的。
2015-03-01 13:52:49
296
原创 HAVING 子句
mysql> SELECT shohin_bunrui,COUNT(*) FROM Shohin GROUP BY shohin_bunrui HAVING COUNT(*)=2;SELECT shohin_bunrui ,COUNT(*) FROM Shohin GROUP BY shohin_bunrui;SELECT shohin_bunrui,COUNT(*) FR
2015-03-01 13:33:03
366
原创 SQL聚合函数
SELECT COUNT(shohin_mei) FROM Shohin;--去掉NULL值SELECT SUM(shiire_tanka) FROM Shohin ;SELECT MAX(shiire_tanka) FROM Shohin;SELECT MIN(shiire_tanka) FROM Shohin;SELECT AVG
2015-02-14 15:55:33
342
原创 sql 运算
mysql> SELECT shohin_mei,shohin_bunrui,hanbai_tanka,hanbai_tanka*2 AS "hanbai_tanka*2" FROM Shohin;sql 常用的运算符 +-*/包含NULL的运算结果是NULLSELECT (100+200)*3 AS keisan;--比较洋的写法 常用的比较运算符
2015-02-10 12:42:56
429
原创 sql查询
SELECT ID AS AID FROM TABLESELECT DISTINCT shohin_bunrui FROM Shohin;//去重SELECT shohin_mei ,shohin_bunrui FROM Shohin WHERE hanbai_tanka > 200;mysql> /* 注释 /*> 也是注释 /*>
2015-02-10 11:24:20
288
原创 table 操作
drop 删除表.ALTER TABLE ADD COLUMN varchar(100)ALTER TABLE DROP COLUMN
2015-02-09 13:14:39
358
原创 数据库语言划分
1 数据定义语言DDL CREATE 创建库表 DROP 删除库表 ALERT 更新库表2 数据操作语言 DML SELECT 查询语言 INSERT 插入语言 UPDATE 更新 DELETE 删除3 流程控制语言 COMMIT 提交 ROLLBACK 取消操作
2015-02-09 10:44:06
276
转载 git branch
分支开发原则：如果本地dev分支有修改，则需要先切换到master分支，把本地分支的修改merge回master（git merge dev），然后在master上把合并后的内容push到master上；然后再切换回本地分支，再把master的内容merge回分支，然后就继续在分支开发。开发流程：// 查看本地分支git branch// 显
2014-12-09 17:57:19
466
转载 断点续传
fileHandle = [NSFileHandle fileHandleForWritingAtPath:temporaryPath]; offset = [fileHandle seekToEndOfFile]; NSString *range = [NSString stringWithFormat:@"bytes=%llu-",offset];
2014-05-22 18:03:22
410
原创 objc_message
http://www.cppblog.com/kesalin/archive/2011/08/15/objc_message.html
2014-05-22 17:06:29
403
转载 老外写的coreimage
http://www.raywenderlich.com/22167/beginning-core-image-in-ios-6
2014-05-20 11:06:30
455
转载 捕捉异常
void UncaughtExceptionHandler(NSException *exception) { NSArray *arr = [exception callStackSymbols]; NSLog(@"arr=:%@",arr); NSString *reason = [exception reason]; NSLog(@
2014-05-16 12:03:47
375
转载 cocoaGCD别人整理
http://www.cocoachina.com/applenews/devnews/2014/0428/8248.html
2014-05-16 07:52:36
341
转载 block使用
http://tanqisen.github.io/blog/2013/04/19/gcd-block-cycle-retain/
2014-05-15 12:15:56
324
转载 runtime 机制
如您所见，NSObject的对象非常之简单，Class 类型的，我们再看Class 是什么:#include // for __DARWIN_NULL#include #include typedef struct objc_class *Class;typedef struct objc_object { Class isa;} *id;
2014-05-14 13:49:34
544
转载 setget方法
@property (retain) Object obj;?12345678910- (Object *)obj { return_obj;} - (void)setObj:(Object *)new
2014-05-09 15:00:46
486
转载 坐标转换
// controllerA 中有一个UITableView, UITableView里有多行UITableVieCell，cell上放有一个button// 在controllerA中实现:CGRect rc = [cell convertRect:cell.btn.frame toView:self.view];// 或CGRect rc = [self.view conver
2014-05-03 15:46:48
579
转载 getAttributedStringHeightWithString
- (int)getAttributedStringHeightWithString:(NSAttributedString *) string WidthValue:(int) width { int total_height = 0; CTFramesetterRef framesetter = CTFramesetterCreateWithAt
2014-04-18 09:45:22
880
原创 NSRegularExpression
NSString *parten = @"#([^\\#]+)#"; NSError* error = NULL; NSRegularExpression* regex = [[NSRegularExpression alloc] initWithPattern:parten
2014-04-17 15:19:32
421
原创 存取文件高手绕道
BOOL saved = [NSKeyedArchiver archiveRootObject:object toFile:filePath]; if (!saved) { DLOG(@"file at %@ save failed", filePath) }
2014-04-15 15:52:33
381
原创 雕虫
int [] myarray = {3,1,6,2,9,0,7,4,5,8};int temp;for (int i = 0; i length; i++) {for (int j = 0; j length-1-i; j++) {if (myarray[j]>myarray[j+1]) {temp = myarray[j];
2014-04-12 16:47:36
394
原创 雕虫小技
typedef struct {unsigned short header;unsigned int contents;unsigned short tail;} msg;...msg *pmsg;pmsg = (msg *)malloc(sizeof(msg));memcpy(pmsg, &source ,sizeof(msg));
2014-04-01 12:37:19
423
原创 静态地图
http://api.map.baidu.com/staticimage?center=116.403874,39.914889&width=400&height=300&zoom=15&markers=116.403874,39.914889&markerStyles=-1,http://api.map.baidu.com/images/marker_red.png,-1,23,25
2014-03-10 17:17:05
676
转载 __block typeof(self) bself = self;
block对于其变量都会形成strong reference，对于self也会形成strong reference ，而如果self本身对block也是 strong reference 的话，就会形成 strong reference 循环，造成内存泄露，为了防止这种情况发生，在block外部应该创建一个week（__block） reference。所以在block内如果有self
2014-01-21 18:21:24
1786
转载 weak
The difference is that an object will be deallocated as soon as there are no strong pointers to it. Even if weak pointers point to it, once the last strong pointer is gone, the object will be dealloca
2014-01-16 10:16:48
470
转载 NSdate时间转换问题
使用NSDateFormatter转换时间字符串时，默认的时区是系统时区，如我们使用一般都是北京时间(＋8)，如果直接使用[cpp] view plaincopyprint?[dateFormatter dateFromString:@"2012-01-01 00:00:00"]; 你会发现实际转换为2011－12－31 16：00
2013-12-10 10:44:56
456
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