iOS的查询、过滤(NSPredicate)
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原文:http://www.2cto.com/kf/201208/150608.html
参考:http://blog.csdn.net/iscape/article/details/7318021
参考:http://blog.csdn.net/zhulei1018/article/details/6777220
首先举一个例子:
匹配9-15个由字母/数字组成的字符串的正则表达式:
NSString * regex = @"^[A-Za-z0-9]{9,15}$";
NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", regex];
BOOL isMatch = [pred evaluateWithObject:txtfldPhoneNumber.text];
Cocoa用NSPredicate描述查询的方式,原理类似于在数据库中进行查询
用BETWEEN,IN,BEGINWITH,ENDWITH,CONTAINS,LIKE这些谓词来构造NSPredicate,必要的时候使用SELF直接对自己进行匹配
[cpp]
//基本的查询
NSPredicate *predicate;
predicate = [NSPredicate predicateWithFormat: @"name == 'Herbie'"];
BOOL match = [predicate evaluateWithObject: car];
NSLog (@"%s", (match) ? "YES" : "NO");
//在整个cars里面循环比较
predicate = [NSPredicate predicateWithFormat: @"engine.horsepower > 150"];
NSArray *cars = [garage cars];
for (Car *car in [garage cars]) {
if ([predicate evaluateWithObject: car]) {
NSLog (@"%@", car.name);
}
}
//输出完整的信息
predicate = [NSPredicate predicateWithFormat: @"engine.horsepower > 150"];
NSArray *results;
results = [cars filteredArrayUsingPredicate: predicate];
NSLog (@"%@", results);
//含有变量的谓词
NSPredicate *predicateTemplate = [NSPredicate predicateWithFormat:@"name == $NAME"];
NSDictionary *varDict;
varDict = [NSDictionary dictionaryWithObjectsAndKeys:
@"Herbie", @"NAME", nil];
predicate = [predicateTemplate predicateWithSubstitutionVariables: varDict];
NSLog(@"SNORGLE: %@", predicate);
match = [predicate evaluateWithObject: car];
NSLog (@"%s", (match) ? "YES" : "NO");
//注意不能使用$VARIABLE作为路径名,因为它值代表值
//谓词字符窜还支持c语言中一些常用的运算符
predicate = [NSPredicate predicateWithFormat:
@"(engine.horsepower > 50) AND (engine.horsepower < 200)"];
results = [cars filteredArrayUsingPredicate: predicate];
NSLog (@"oop %@", results);
predicate = [NSPredicate predicateWithFormat: @"name < 'Newton'"];
results = [cars filteredArrayUsingPredicate: predicate];
NSLog (@"%@", [results valueForKey: @"name"]);
//强大的数组运算符
predicate = [NSPredicate predicateWithFormat:
@"engine.horsepower BETWEEN { 50, 200 }"];
results = [cars filteredArrayUsingPredicate: predicate];
NSLog (@"%@", results);
NSArray *betweens = [NSArray arrayWithObjects:
[NSNumber numberWithInt: 50], [NSNumber numberWithInt: 200], nil];
predicate = [NSPredicate predicateWithFormat: @"engine.horsepower BETWEEN %@", betweens];
results = [cars filteredArrayUsingPredicate: predicate];
NSLog (@"%@", results);
predicateTemplate = [NSPredicate predicateWithFormat: @"engine.horsepower BETWEEN $POWERS"];
varDict = [NSDictionary dictionaryWithObjectsAndKeys: betweens, @"POWERS", nil];
predicate = [predicateTemplate predicateWithSubstitutionVariables: varDict];
results = [cars filteredArrayUsingPredicate: predicate];
NSLog (@"%@", results);
//IN运算符
predicate = [NSPredicate predicateWithFormat: @"name IN { 'Herbie', 'Snugs', 'Badger', 'Flap' }"];
results = [cars filteredArrayUsingPredicate: predicate];
NSLog (@"%@", [results valueForKey: @"name"]);
predicate = [NSPredicate predicateWithFormat: @"SELF.name IN { 'Herbie', 'Snugs', 'Badger', 'Flap' }"];
results = [cars filteredArrayUsingPredicate: predicate];
NSLog (@"%@", [results valueForKey: @"name"]);
names = [cars valueForKey: @"name"];
predicate = [NSPredicate predicateWithFormat: @"SELF IN { 'Herbie', 'Snugs', 'Badger', 'Flap' }"];
results = [names filteredArrayUsingPredicate: predicate];//这里限制了SELF的范围
NSLog (@"%@", results);
//BEGINSWITH,ENDSWITH,CONTAINS
//附加符号,[c],[d],[cd],c表示不区分大小写,d表示不区分发音字符,cd表示什么都不区分
predicate = [NSPredicate predicateWithFormat: @"name BEGINSWITH 'Bad'"];
results = [cars filteredArrayUsingPredicate: predicate];
NSLog (@"%@", results);
predicate = [NSPredicate predicateWithFormat: @"name BEGINSWITH 'HERB'"];
results = [cars filteredArrayUsingPredicate: predicate];
NSLog (@"%@", results);
predicate = [NSPredicate predicateWithFormat: @"name BEGINSWITH[cd] 'HERB'"];
results = [cars filteredArrayUsingPredicate: predicate];
NSLog (@"%@", results);
//LIKE运算符(通配符)
predicate = [NSPredicate predicateWithFormat: @"name LIKE[cd] '*er*'"];
results = [cars filteredArrayUsingPredicate: predicate];
NSLog (@"%@", results);
predicate = [NSPredicate predicateWithFormat: @"name LIKE[cd] '???er*'"];
results = [cars filteredArrayUsingPredicate: predicate];
NSLog (@"%@", results);
//基本的查询
NSPredicate *predicate;
predicate = [NSPredicate predicateWithFormat: @"name == 'Herbie'"];
BOOL match = [predicate evaluateWithObject: car];
NSLog (@"%s", (match) ? "YES" : "NO");
//在整个cars里面循环比较
predicate = [NSPredicate predicateWithFormat: @"engine.horsepower > 150"];
NSArray *cars = [garage cars];
for (Car *car in [garage cars]) {
if ([predicate evaluateWithObject: car]) {
NSLog (@"%@", car.name);
}
}
//输出完整的信息
predicate = [NSPredicate predicateWithFormat: @"engine.horsepower > 150"];
NSArray *results;
results = [cars filteredArrayUsingPredicate: predicate];
NSLog (@"%@", results);
//含有变量的谓词
NSPredicate *predicateTemplate = [NSPredicate predicateWithFormat:@"name == $NAME"];
NSDictionary *varDict;
varDict = [NSDictionary dictionaryWithObjectsAndKeys:
@"Herbie", @"NAME", nil];
predicate = [predicateTemplate predicateWithSubstitutionVariables: varDict];
NSLog(@"SNORGLE: %@", predicate);
match = [predicate evaluateWithObject: car];
NSLog (@"%s", (match) ? "YES" : "NO");
//注意不能使用$VARIABLE作为路径名,因为它值代表值
//谓词字符窜还支持c语言中一些常用的运算符
predicate = [NSPredicate predicateWithFormat:
@"(engine.horsepower > 50) AND (engine.horsepower < 200)"];
results = [cars filteredArrayUsingPredicate: predicate];
NSLog (@"oop %@", results);
predicate = [NSPredicate predicateWithFormat: @"name < 'Newton'"];
results = [cars filteredArrayUsingPredicate: predicate];
NSLog (@"%@", [results valueForKey: @"name"]);
//强大的数组运算符
predicate = [NSPredicate predicateWithFormat:
@"engine.horsepower BETWEEN { 50, 200 }"];
results = [cars filteredArrayUsingPredicate: predicate];
NSLog (@"%@", results);
NSArray *betweens = [NSArray arrayWithObjects:
[NSNumber numberWithInt: 50], [NSNumber numberWithInt: 200], nil];
predicate = [NSPredicate predicateWithFormat: @"engine.horsepower BETWEEN %@", betweens];
results = [cars filteredArrayUsingPredicate: predicate];
NSLog (@"%@", results);
predicateTemplate = [NSPredicate predicateWithFormat: @"engine.horsepower BETWEEN $POWERS"];
varDict = [NSDictionary dictionaryWithObjectsAndKeys: betweens, @"POWERS", nil];
predicate = [predicateTemplate predicateWithSubstitutionVariables: varDict];
results = [cars filteredArrayUsingPredicate: predicate];
NSLog (@"%@", results);
//IN运算符
predicate = [NSPredicate predicateWithFormat: @"name IN { 'Herbie', 'Snugs', 'Badger', 'Flap' }"];
results = [cars filteredArrayUsingPredicate: predicate];
NSLog (@"%@", [results valueForKey: @"name"]);
predicate = [NSPredicate predicateWithFormat: @"SELF.name IN { 'Herbie', 'Snugs', 'Badger', 'Flap' }"];
results = [cars filteredArrayUsingPredicate: predicate];
NSLog (@"%@", [results valueForKey: @"name"]);
names = [cars valueForKey: @"name"];
predicate = [NSPredicate predicateWithFormat: @"SELF IN { 'Herbie', 'Snugs', 'Badger', 'Flap' }"];
results = [names filteredArrayUsingPredicate: predicate];//这里限制了SELF的范围
NSLog (@"%@", results);
//BEGINSWITH,ENDSWITH,CONTAINS
//附加符号,[c],[d],[cd],c表示不区分大小写,d表示不区分发音字符,cd表示什么都不区分
predicate = [NSPredicate predicateWithFormat: @"name BEGINSWITH 'Bad'"];
results = [cars filteredArrayUsingPredicate: predicate];
NSLog (@"%@", results);
predicate = [NSPredicate predicateWithFormat: @"name BEGINSWITH 'HERB'"];
results = [cars filteredArrayUsingPredicate: predicate];
NSLog (@"%@", results);
predicate = [NSPredicate predicateWithFormat: @"name BEGINSWITH[cd] 'HERB'"];
results = [cars filteredArrayUsingPredicate: predicate];
NSLog (@"%@", results);
//LIKE运算符(通配符)
predicate = [NSPredicate predicateWithFormat: @"name LIKE[cd] '*er*'"];
results = [cars filteredArrayUsingPredicate: predicate];
NSLog (@"%@", results);
predicate = [NSPredicate predicateWithFormat: @"name LIKE[cd] '???er*'"];
results = [cars filteredArrayUsingPredicate: predicate];
NSLog (@"%@", results);
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