IOS CoreData的简单使用

#import "ViewController.h"
#import <CoreData/CoreData.h>
#import "Employee.h"

@interface ViewController (){
    NSManagedObjectContext *_context;
}

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
   
    [self setupContext];
    
}

-(void)setupContext{
    _context = [[NSManagedObjectContext alloc] init];
    
    // 模型文件
    NSManagedObjectModel *model = [NSManagedObjectModel mergedModelFromBundles:nil];
    
    // 持久化存储调度器
    NSPersistentStoreCoordinator *store = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:model];
    

    
    NSString *doc = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
    NSLog(@"%@",doc);
    NSString *sqlitePath = [doc stringByAppendingPathComponent:@"company.sqlite"];
    
    //数据存储的类型 数据库存储路径
    [store addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:[NSURL fileURLWithPath:sqlitePath] options:nil error:nil];
    
    
    _context.persistentStoreCoordinator = store;
}

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
    
    NSFetchRequest *request = [NSFetchRequest fetchRequestWithEntityName:@"Employee"];
    
    NSPredicate *pre = [NSPredicate predicateWithFormat:@"name like 'z*n'"];
    request.predicate = pre;
    NSArray *emps =  [_context executeFetchRequest:request error:nil];

    NSLog(@"%@",emps);
}


-(void)createEmployee{
    Employee *employee = [NSEntityDescription insertNewObjectForEntityForName:@"Employee" inManagedObjectContext:_context];
    
    employee.name = @"zhangsan";
    employee.age = @18;
    employee.height = @1.89;
    
    [_context save:nil];
}