NSPredicate的在查询中的简单使用

标签：nspredicate   like   predicatewithformat   正则   

上代码吧，每块代码都可以直接跑，并附有注释和运行结果

//直接使用 == 严格匹配
NSArray *arrOriginal = [NSArray arrayWithObjects:@"c1",@"c", @"cd", @"cdd", @"cd", nil];
NSString *match = @"cd";
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF == %@", match];
NSArray *results = [arrOriginal filteredArrayUsingPredicate:predicate];
NSLog(@"result===%@",results);

//like匹配，类似Sql中的用法
NSArray *arrOriginal = [NSArray arrayWithObjects:@"c1",@"d", @"cd", @"cdd", @"dd",@"dcd",@"cdc", nil];
NSString *match = @"c*";//以c开头
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF like %@", match];
NSArray *results = [arrOriginal filteredArrayUsingPredicate:predicate];
NSLog(@"result===%@",results);

//忽略大小写进行匹配
NSArray *arrOriginal = [NSArray arrayWithObjects:@"Cdd",@"cDc",@"cdd",@"dcdd", nil];
NSString *match = @"cd*";
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF like[c] %@", match];
NSArray *results = [arrOriginal filteredArrayUsingPredicate:predicate];
NSLog(@"result===%@",results);

//利用正则表达是进行过滤
NSArray *arrOriginal = [NSArray arrayWithObjects:@"c1",@"C3",@"d2",@"c2", nil];
NSString *match = @"^c\\d?";
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF matches %@", match];
NSArray *results = [arrOriginal filteredArrayUsingPredicate:predicate];
NSLog(@"result===%@",results);

//利用过滤器（数组）进行过滤
NSArray *arrFilter = [NSArray arrayWithObjects:@"aa", @"bb", nil];
NSArray *arrOriginal = [NSArray arrayWithObjects:@"dds",@"bb",@"c1",@"C3",@"bb",@"aa",@"c2", nil];
NSPredicate *predicate  = [NSPredicate predicateWithFormat:@"NOT (SELF in %@)", arrFilter];//不包含符合过滤器的内容
NSArray *results = [arrOriginal filteredArrayUsingPredicate:predicate];
NSLog(@"result===%@",results);

NSPredicate的在查询中的简单使用

标签：nspredicate   like   predicatewithformat   正则   

原文地址：http://blog.csdn.net/u011439689/article/details/41383909