基于iOS Realm数据库的使用实例详解

#import <Realm/Realm.h>@interface TestBean : RLMObject@property NSString* name;@property NSInteger age;@end// This protocol enables typed collections. i.e.:// RLMArray<TestBean *><TestBean>RLM_ARRAY_TYPE(TestBean)#import "TestBean.h"@implementation TestBean@end

-(void)addAction{ NSLog(@"add"); self.name = _tf_name.text; self.age = [_tf_age.text integerValue]; TestBean* bean = [[TestBean alloc]init]; bean.name = self.name; bean.age = self.age; RLMRealm *realm = [RLMRealm defaultRealm]; [realm transactionWithBlock:^{  [realm addObject:bean]; }];}

-(void)deleteAction{ NSLog(@"delete"); RLMResults *dogs = [TestBean allObjects]; RLMRealm *realm = [RLMRealm defaultRealm]; [realm transactionWithBlock:^{  for (TestBean *bean in dogs) {   [realm deleteObject:bean];  } }];}

-(void)updateAction{ NSLog(@"update"); RLMResults *dogs = [TestBean allObjects]; [[RLMRealm defaultRealm] transactionWithBlock:^{  for (TestBean *bean in dogs) {   bean.name = @"李四";  } }];}

// 使用断言字符串来查询RLMResults<Dog *> *tanDogs = [Dog objectsWhere:@"color = 'tan' AND name BEGINSWITH 'B'"];// 使用 NSPredicate 来查询NSPredicate *pred = [NSPredicate predicateWithFormat:@"color = %@ AND name BEGINSWITH %@",              @"tan", @"B"];tanDogs = [Dog objectsWithPredicate:pred];

-(void)sortAction{ NSLog(@"query"); RLMResults *dogs = [[TestBean allObjects] sortedResultsUsingKeyPath:@"name" ascending:YES]; [[RLMRealm defaultRealm] transactionWithBlock:^{  for (TestBean *bean in dogs) {   NSLog(@"%@",bean.name);  } }];}

//// ViewController.m// BmobTest//// Created by shanreal-iOS on 2017/12/9.// Copyright © 2017年 shanreal.LongZhenHao. All rights reserved.//#import "ViewController.h"#import "TestBean.h"@interface ViewController ()@property(nonatomic,strong)UIButton* add;@property(nonatomic,strong)UIButton* delete;@property(nonatomic,strong)UIButton* update;@property(nonatomic,strong)UIButton* query;@property(nonatomic,strong)UIButton* sort;@property(nonatomic,strong)NSString* name;@property(nonatomic,assign)NSInteger* age;@property(nonatomic,strong)UITextField* tf_name;@property(nonatomic,strong)UITextField* tf_age;@end@implementation ViewController- (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. _add = [[UIButton alloc]initWithFrame:CGRectMake(10, 30, 100, 20)]; [_add setTitle:@"add" forState:UIControlStateNormal]; [_add setTitleColor:[UIColor blackColor] forState:UIControlStateNormal]; [_add addTarget:self action:@selector(addAction) forControlEvents:UIControlEventTouchUpInside]; _delete = [[UIButton alloc]initWithFrame:CGRectMake(10, 60, 100, 20)]; [_delete setTitle:@"delete" forState:UIControlStateNormal]; [_delete setTitleColor:[UIColor blackColor] forState:UIControlStateNormal]; [_delete addTarget:self action:@selector(deleteAction) forControlEvents:UIControlEventTouchUpInside]; _update = [[UIButton alloc]initWithFrame:CGRectMake(10, 90, 100, 20)]; [_update setTitle:@"update" forState:UIControlStateNormal]; [_update setTitleColor:[UIColor blackColor] forState:UIControlStateNormal]; [_update addTarget:self action:@selector(updateAction) forControlEvents:UIControlEventTouchUpInside]; _query = [[UIButton alloc]initWithFrame:CGRectMake(10, 120, 100, 20)]; [_query setTitle:@"query" forState:UIControlStateNormal]; [_query setTitleColor:[UIColor blackColor] forState:UIControlStateNormal]; [_query addTarget:self action:@selector(queryAction) forControlEvents:UIControlEventTouchUpInside]; _sort = [[UIButton alloc]initWithFrame:CGRectMake(10, 150, 100, 20)]; [_sort setTitle:@"sort" forState:UIControlStateNormal]; [_sort setTitleColor:[UIColor blackColor] forState:UIControlStateNormal]; [_sort addTarget:self action:@selector(sortAction) forControlEvents:UIControlEventTouchUpInside]; _tf_name = [[UITextField alloc]initWithFrame:CGRectMake(50, 300, 200, 20)]; _tf_name.placeholder=@"name"; _tf_age = [[UITextField alloc]initWithFrame:CGRectMake(50, 350, 200, 20)]; _tf_age.placeholder=@"age"; [self.view addSubview:_add]; [self.view addSubview:_delete]; [self.view addSubview:_update]; [self.view addSubview:_query]; [self.view addSubview:_sort]; [self.view addSubview:_tf_name]; [self.view addSubview:_tf_age];}-(void)addAction{ NSLog(@"add"); self.name = _tf_name.text; self.age = [_tf_age.text integerValue]; TestBean* bean = [[TestBean alloc]init]; bean.name = self.name; bean.age = self.age; RLMRealm *realm = [RLMRealm defaultRealm]; [realm transactionWithBlock:^{  [realm addObject:bean]; }];}-(void)deleteAction{ NSLog(@"delete"); RLMResults *dogs = [TestBean allObjects]; RLMRealm *realm = [RLMRealm defaultRealm]; [realm transactionWithBlock:^{  for (TestBean *bean in dogs) {   [realm deleteObject:bean];  } }];}-(void)updateAction{ NSLog(@"update"); RLMResults *dogs = [TestBean allObjects]; [[RLMRealm defaultRealm] transactionWithBlock:^{  for (TestBean *bean in dogs) {   bean.name = @"李四";  } }];}-(void)queryAction{ NSLog(@"query"); RLMResults *dogs = [TestBean allObjects]; [[RLMRealm defaultRealm] transactionWithBlock:^{  for (TestBean *bean in dogs) {   NSLog(@"%@",bean.name);  } }];}-(void)sortAction{ NSLog(@"query"); RLMResults *dogs = [[TestBean allObjects] sortedResultsUsingKeyPath:@"name" ascending:YES]; [[RLMRealm defaultRealm] transactionWithBlock:^{  for (TestBean *bean in dogs) {   NSLog(@"%@",bean.name);  } }];}- (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated.}@end