CoreData NSPredicate 查询、搜索

转自：http://www.cnblogs.com/thefeelingofsimple/archive/2013/01/31/2886915.html

简述：Cocoa框架中的nspredicate用于查询，原理和用法都类似于sql中的where，作用相当于数据库的过滤取。

最常用到的函数

+ (nspredicate *)predicateWithFormat:(Nsstring *)predicateFormat,...;

1.比较运算符 > 、< 、== 、 >= 、<= 、 !=
例：@"number >= 99"

2.范围运算符：IN 、BETWEEN
例：@"number BETWEEN {1,5}"
@"address IN {'shanghai','nanjing'}"

3.字符串本身:SELF
例：@"SELF == 'APPLE'"

4.字符串相关：BEGINSWITH、ENDSWITH、CONTAINS
例：@"name CONTAIN[cd] 'ang'" //包含某个字符串
@"name BEGINSWITH[c] 'sh'" //以某个字符串开头
@"name ENDSWITH[d] 'ang'" //以某个字符串结束
注:[c]不区分大小写,[d]不区分发音符号即没有重音符号,[cd]既不区分大小写，也不区分发音符号。

5.通配符：LIKE
例：@"name LIKE[cd] '*er*'" //*代表通配符,Like也接受[cd].
@"name LIKE[cd] '???er*'"

6.正则表达式：MATCHES
例：Nsstring *regex = @"^A.+e$"; //以A开头，e结尾
@"name MATCHES %@",regex

实际应用:对NSArray进行过滤

NSArray *array = [[NSArray alloc]initWithObjects:@"beijing",shanghaiguangzouwuhan",nil];  
Nsstring *string = ang;  
nspredicate *pred = [nspredicate predicateWithFormat:SELF CONTAINS %@string];  
NSLog(%@ 
   实际应用:判断字符串首字母是否为字母 
 
  
 Nsstring *regex = [A-Za-z]+;  
nspredicate *predicate = [nspredicate predicateWithFormat:SELF MATCHES %@if ([predicate evaluateWithObject:aString]) {  
}   
  
   实际应用:字符串替换 
 
  
 NSError* error = NULL;  
NSRegularExpression* regex = [NSRegularExpression regularExpressionWithPattern:(encoding=\")[^\"]+(\")  
                                                                            options:0  
                                                                            error:&error];  
Nsstring* sample = <xml encoding=\"abc\></xml><xml encoding=\"def\"></xml><xml encoding=\"ttt\"></xml>;  
NSLog(Start:%@sstring* result = [regex stringByReplacingMatchesInString:sample  
                                                      options:  
                                                       range:NSMakeRange($1utf-8$2Result:%@ 
   实际应用:截取字符串 
 
  
 //组装一个字符串，需要把里面的网址解析出来  
Nsstring *urlString=<Meta/><link/><title>1Q84 BOOK1</title></head><body>;  
  
NSRegularExpression类里面调用表达的方法需要传递一个NSError的参数。下面定义一个    
NSError *error;  
  
http+:[^\\s]* 这个表达式是检测一个网址的。(?<=title\>).*(?=</title)截取html文章中的<title></title>中内文字的正则表达式  
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:(?<=title\\>).*(?=</title)" options:0 error:&error];  
  
if (regex != nil) {  
    NSTextCheckingResult *firstMatch=[regex firstMatchInString:urlString options:0 range:NSMakeRange( (firstMatch) {  
        NSRange resultRange = [firstMatch rangeAtIndex:];  
          
        从urlString当中截取数据  
        Nsstring *result=[urlString substringWithRange:resultRange];  
        输出结果  
        NSLog(->%@<- 
   实际应用:判断手机号码，电话号码函数 
 正则判断手机号码地址格式
- (BOOL)isMobileNumber:(Nsstring *)mobileNum
{
       /**
        * 手机号码
        * 移动：134[0-8],135,136,137,138,139,150,151,157,158,159,182,187,188
        * 联通：130,131,132,152,155,156,185,186
        * 电信：133,1349,153,180,189
        */
       Nsstring * MOBILE = ^1(3[0-9]|5[0-35-9]|8[025-9])\\d{8}$;
       *
        10         * 中国移动：China Mobile
        11         * 134[0-8],188
        12         
       Nsstring * CM = ^1(34[0-8]|(3[5-9]|5[017-9]|8[278])\\d)\\d{7}$*
        15         * 中国联通：China Unicom
        16         * 130,186
        17         
       Nsstring * CU = ^1(3[0-2]|5[256]|8[56])\\d{8}$*
        20         * 中国电信：China Telecom
        21         * 133,189
        22         
       Nsstring * CT = ^1((33|53|8[09])[0-9]|349)\\d{7}$*
        25         * 大陆地区固话及小灵通
        26         * 区号：010,020,021,022,023,024,025,027,028,029
        27         * 号码：七位或八位
        28         */
       Nsstring * PHS = @"^0(10|2[0-5789]|\\d{3})\\d{7,8}$";
    
     nspredicate *regextestmobile = [nspredicate predicateWithFormat:nspredicate *regextestcm = [nspredicate predicateWithFormat:nspredicate *regextestcu = [nspredicate predicateWithFormat:nspredicate *regextestct = [nspredicate predicateWithFormat:if (([regextestmobile evaluateWithObject:mobileNum] == YES)
    || ([regextestcm evaluateWithObject:mobileNum] == YES)
    || ([regextestct evaluateWithObject:mobileNum] == YES)
    || ([regextestcu evaluateWithObject:mobileNum] == YES))
    {
        if([regextestcm evaluateWithObject:mobileNum] == YES) {
          NSLog(China Mobile);
        } else if([regextestct evaluateWithObject:mobileNum] ==China Telecomif ([regextestcu evaluateWithObject:mobileNum] ==China Unicomelse {
          NSLog(UnkNow);
        }
        
        return YES;
    }
     
    {
         NO;
    }
} 
  
   实际应用:邮箱验证、电话号码验证 
是否是有效的正则表达式

+(BOOL)isValidateRegularExpression:(Nsstring *)strDestination byExpression:(Nsstring *)strExpression

{

   nspredicate *predicate = [nspredicatepredicateWithFormat: [predicate evaluateWithObject:strDestination];

}

验证email
+(BOOL)isValidateEmail:(Nsstring *)email {

   Nsstring *strRegex = [A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{1,5};

   BOOL rt = [CommonTools isValidateRegularExpression:email byExpression:strRegex];

    rt;

}

验证电话号码
+(BOOL)isValidateTelNumber:(Nsstring *)number {

   Nsstring *strRegex = [0-9]{1,20} [CommonTools isValidateRegularExpression:number byExpression:strRegex];

    rt;

} 
  
   实际应用:NSDate进行筛选 
日期在十天之内:
NSDate *endDate = [[NSDate date] retain];
NSTimeInterval timeInterval= [endDate timeIntervalSinceReferenceDate];
timeInterval -=3600*24*10;
NSDate *beginDate = [[NSDate dateWithTimeIntervalSinceReferenceDate:timeInterval] retain];
对coredata进行筛选(假设有fetchRequest)
nspredicate *predicate_date =
[nspredicate predicateWithFormat:date >= %@ AND date <= %@释放retained的对象
[endDate release];
[beginDate release];

CoreData NSPredicate 查询、搜索

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