NSComparisonPredicate NSEqualToPredicateOperatorType
Defines the type of comparison for NSComparisonPredicate.
enum {
NSLessThanPredicateOperatorType = 0,
NSLessThanOrEqualToPredicateOperatorType,
NSGreaterThanPredicateOperatorType,
NSGreaterThanOrEqualToPredicateOperatorType,
NSEqualToPredicateOperatorType,
NSNotEqualToPredicateOperatorType,
NSMatchesPredicateOperatorType,
NSLikePredicateOperatorType,
NSBeginsWithPredicateOperatorType,
NSEndsWithPredicateOperatorType,
NSInPredicateOperatorType,
NSCustomSelectorPredicateOperatorType,
NSContainsPredicateOperatorType,
NSBetweenPredicateOperatorType
};
typedef NSUInteger NSPredicateOperatorType;
Constants
NSLessThanPredicateOperatorType
A less-than predicate.
NSLessThanOrEqualToPredicateOperatorType
A less-than-or-equal-to predicate.
NSGreaterThanPredicateOperatorType
A greater-than predicate.
NSGreaterThanOrEqualToPredicateOperatorType
A greater-than-or-equal-to predicate.
NSEqualToPredicateOperatorType
An equal-to predicate.
NSNotEqualToPredicateOperatorType
A not-equal-to predicate.
NSMatchesPredicateOperatorType
A full regular expression matching predicate.
NSLikePredicateOperatorType
A simple subset of the MATCHES predicate, similar in behavior to SQL LIKE.
NSBeginsWithPredicateOperatorType
A begins-with predicate.
NSEndsWithPredicateOperatorType
An ends-with predicate.
NSInPredicateOperatorType
A predicate to determine if the left hand side is in the right hand side.
For strings, returns YES if the left hand side is a substring of the right hand side . For collections, returns YES if the left hand side is in the right hand side .
NSCustomSelectorPredicateOperatorType
A predicate that uses a custom selector that takes a single argument and returns a BOOL value.
The selector is invoked on the left hand side with the right hand side as the argument.
NSContainsPredicateOperatorType
A predicate to determine if the left hand side contains the right hand side.
Returns YES if [lhs contains rhs]; the left hand side must be an NSExpression object that evaluates to a collection
NSBetweenPredicateOperatorType
A predicate to determine if the right hand side lies at or between bounds specified by the left hand side.
Returns YES if [lhs between rhs]; the right hand side must be an array in which the first element sets the lower bound and the second element the upper, inclusive. Comparison is performed using compare: or the class-appropriate equivalent.
NSComparisonPredicate NSEqualToPredicateOperatorType example.
-(NSPredicate *) predicateWithStudyID:(NSString *) aStudyID studyName:(NSString *) aStudyName date:(NSDate *) aDate{
NSPredicate *p;
NSMutableArray *preds=[[NSMutableArray alloc] initWithCapacity:1];
if (aDate != nil) {
NSExpression *dateKeyEx=[NSExpression expressionForKeyPath:@"studyDate"];
NSExpression *aDateEx=[NSExpression expressionForConstantValue:aDate];
NSPredicate *datePred=[NSComparisonPredicate predicateWithLeftExpression:dateKeyEx
rightExpression:aDateEx
modifier:NSDirectPredicateModifier
type:NSEqualToPredicateOperatorType
options:0];
[preds addObject:datePred];
}
if (![aStudyID isEqualToString:@""]) {
NSExpression *studyIDKeyEx=[NSExpression expressionForKeyPath:@"studyID"];
NSExpression *aStudyIDEx=[NSExpression expressionForConstantValue:aStudyID];
NSPredicate *studyIDPred=[NSComparisonPredicate predicateWithLeftExpression:studyIDKeyEx
rightExpression:aStudyIDEx
modifier:NSDirectPredicateModifier
type:NSLikePredicateOperatorType
options:NSCaseInsensitivePredicateOption];
[preds addObject:studyIDPred];
}
if (![aStudyName isEqualToString:@""]) {
NSExpression *studyNameKeyEx=[NSExpression expressionForKeyPath:@"studyName"];
NSExpression *aStudyNameEx=[NSExpression expressionForConstantValue:aStudyName];
NSPredicate *studyNamePred=[NSComparisonPredicate predicateWithLeftExpression:studyNameKeyEx
rightExpression:aStudyNameEx
modifier:NSDirectPredicateModifier
type:NSLikePredicateOperatorType
options:NSCaseInsensitivePredicateOption];
[preds addObject:studyNamePred];
}
p=[NSCompoundPredicate andPredicateWithSubpredicates:preds];
[preds release];
return p;
}
NSPredicate *p;
NSMutableArray *preds=[[NSMutableArray alloc] initWithCapacity:1];
if (aDate != nil) {
NSExpression *dateKeyEx=[NSExpression expressionForKeyPath:@"studyDate"];
NSExpression *aDateEx=[NSExpression expressionForConstantValue:aDate];
NSPredicate *datePred=[NSComparisonPredicate predicateWithLeftExpression:dateKeyEx
rightExpression:aDateEx
modifier:NSDirectPredicateModifier
type:NSEqualToPredicateOperatorType
options:0];
[preds addObject:datePred];
}
if (![aStudyID isEqualToString:@""]) {
NSExpression *studyIDKeyEx=[NSExpression expressionForKeyPath:@"studyID"];
NSExpression *aStudyIDEx=[NSExpression expressionForConstantValue:aStudyID];
NSPredicate *studyIDPred=[NSComparisonPredicate predicateWithLeftExpression:studyIDKeyEx
rightExpression:aStudyIDEx
modifier:NSDirectPredicateModifier
type:NSLikePredicateOperatorType
options:NSCaseInsensitivePredicateOption];
[preds addObject:studyIDPred];
}
if (![aStudyName isEqualToString:@""]) {
NSExpression *studyNameKeyEx=[NSExpression expressionForKeyPath:@"studyName"];
NSExpression *aStudyNameEx=[NSExpression expressionForConstantValue:aStudyName];
NSPredicate *studyNamePred=[NSComparisonPredicate predicateWithLeftExpression:studyNameKeyEx
rightExpression:aStudyNameEx
modifier:NSDirectPredicateModifier
type:NSLikePredicateOperatorType
options:NSCaseInsensitivePredicateOption];
[preds addObject:studyNamePred];
}
p=[NSCompoundPredicate andPredicateWithSubpredicates:preds];
[preds release];
return p;
}
Example of [NSComparisonPredicate NSEqualToPredicateOperatorType].
NSExpression *left = [NSExpression expressionForKeyPath:@"length"];
NSExpression *right = [NSExpression expressionForConstantValue:[NSNumber numberWithInt:0]];
NSComparisonPredicateModifier modifier = NSDirectPredicateModifier;
NSPredicateOperatorType operator = NSEqualToPredicateOperatorType;
NSPredicate *predicate = [NSComparisonPredicate predicateWithLeftExpression:left rightExpression:right modifier:modifier type:operator options:0];
NSArray *filtered = [myArray filteredArrayUsingPredicate:predicate];
NSExpression *right = [NSExpression expressionForConstantValue:[NSNumber numberWithInt:0]];
NSComparisonPredicateModifier modifier = NSDirectPredicateModifier;
NSPredicateOperatorType operator = NSEqualToPredicateOperatorType;
NSPredicate *predicate = [NSComparisonPredicate predicateWithLeftExpression:left rightExpression:right modifier:modifier type:operator options:0];
NSArray *filtered = [myArray filteredArrayUsingPredicate:predicate];
NSComparisonPredicate NSEqualToPredicateOperatorType example.
NSPredicate *nameQuery =
[NSComparisonPredicate predicateWithLeftExpression:[NSExpression expressionForKeyPath:@"s_name"]
rightExpression:[NSExpression expressionForConstantValue:Name]
modifier:NSDirectPredicateModifier
type:NSLikePredicateOperatorType
options:NSCaseInsensitivePredicateOption|NSDiacriticInsensitivePredicateOption];
NSPredicate *regNoQuery =
[NSComparisonPredicate predicateWithLeftExpression:[NSExpression expressionForKeyPath:@"s_regno"]
rightExpression:[NSExpression expressionForConstantValue:RegNo]
modifier:NSDirectPredicateModifier
type:NSEqualToPredicateOperatorType
options:0];
NSPredicate *query = [NSCompoundPredicate andPredicateWithSubpredicates:@[nameQuery,regNoQuery]];
[NSComparisonPredicate predicateWithLeftExpression:[NSExpression expressionForKeyPath:@"s_name"]
rightExpression:[NSExpression expressionForConstantValue:Name]
modifier:NSDirectPredicateModifier
type:NSLikePredicateOperatorType
options:NSCaseInsensitivePredicateOption|NSDiacriticInsensitivePredicateOption];
NSPredicate *regNoQuery =
[NSComparisonPredicate predicateWithLeftExpression:[NSExpression expressionForKeyPath:@"s_regno"]
rightExpression:[NSExpression expressionForConstantValue:RegNo]
modifier:NSDirectPredicateModifier
type:NSEqualToPredicateOperatorType
options:0];
NSPredicate *query = [NSCompoundPredicate andPredicateWithSubpredicates:@[nameQuery,regNoQuery]];
