每次更新用户数据用插入，在插入前删除数据，登出把数据删了（登录获取用户数据）。

#import <Foundation/Foundation.h>
@interface UserModel : NSObject

///用户ID
@property (nonatomic , assign) NSInteger identifie;

///姓名
@property (nonatomic , strong) NSString * name;

///性别
@property (nonatomic , strong) NSString * sex;

///年龄
@property (nonatomic , assign) NSInteger age;

///手机
@property (nonatomic , strong) NSString * mobile;

///头像ID
@property (nonatomic , assign) NSInteger  image_id;

///头像路径
@property (nonatomic , strong) NSString * image_path;

@end

UserDataManger.h

#import "FMDB.h"
#import "UserModel.h"
@interface UserDataManger : NSObject

#pragma mark ----单例----
+(UserDataManger *)shareInstance;

#pragma mark ---打开数据库---
-(void)openDB;

#pragma mark ---在数据库中创建表---
-(void)createTableWithTableName;

#pragma mark ---添加数据---
-(void)insertUserData:(UserModel *)usermodel ;

#pragma mark ---查询数据---
-(UserModel *)getUserInfor;
@end

UserDataManger.m

#import "UserDataManger.h"
static FMDatabase *db = nil;

@implementation UserDataManger

+(UserDataManger *)shareInstance
{
    static dispatch_once_t onceToken;
    static  UserDataManger * manger = nil;
    dispatch_once(&onceToken, ^{
        manger = [[UserDataManger alloc]init];
        [manger openDB];
        [manger createTableWithTableName];
    });
    return manger;
}

-(NSString *)createSqliteWithSqliteName
{
    return [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)firstObject]stringByAppendingPathComponent:@"user.sqlite"];
}

#pragma mark ---打开数据库---
-(void)openDB
{
    if (db != nil) {
        return;
    }
    NSString *path = [self createSqliteWithSqliteName];
    NSLog(@"path ==== %@",path);
    db = [FMDatabase databaseWithPath:path];
    if ([db open]) {
        NSLog(@"数据库打开成功");
    }
    else {
        NSLog(@"数据库打开失败");
    }
}

#pragma mark ---在数据库中创建表---表名--user
-(void)createTableWithTableName
{
    [db open];
    NSString *string = [NSString stringWithFormat:@"create table if not exists user (ID integer primary key autoincrement, identifie integer, name text, sex text, age integer, mobile text, image_id integer, image_path text)"];
    BOOL flag = [db executeUpdate:string];
    NSLog(@"创建表flag ==== %d",flag);
}

#pragma mark ---添加数据---
-(void)insertUserData:(UserModel *)usermodel
{
    UserModel * model = usermodel;
    [db open];
    //这样设计适合存个人数据
    NSInteger count =[[db stringForQuery:@"select count(*) from user"] integerValue];
    if (count > 0) {
        [db executeUpdate:@"DELETE FROM user WHERE 1=1"];
    }
    NSString *string = [NSString stringWithFormat:@"insert into user (identifie, name, sex, age, mobile, image_id, image_path) values (?, ?, ?, ?, ?, ?, ?)"];
    NSString *identifie = [NSString stringWithFormat:@"%ld",(long)model.identifie];
    NSString *age = [NSString stringWithFormat:@"%ld",(long)model.age];
    NSString *image_id = [NSString stringWithFormat:@"%ld",(long)model.image_id];
    BOOL flag = [db executeUpdate:string,identifie,model.name,model.sex,age,model.mobile,image_id,model.image_path];
    NSLog(@"插入数据flag ==== %d",flag);
    [db close];
}

#pragma mark ---查询数据---
-(UserModel *)getUserInfor{
    UserModel  *model = [[UserModel alloc]init];
    [db open];
    NSString *string = [NSString stringWithFormat:@"select * from user"];
    FMResultSet *result = [db executeQuery:string];
    while ([result next]) {
        model.identifie  = [result intForColumn:@"identifie"];
        model.name       = [result stringForColumn:@"name"];
        model.sex        = [result stringForColumn:@"age"];
        model.age        = [result intForColumn:@"age"];
        model.mobile     = [result stringForColumn:@"mobile"];
        model.image_id   = [result intForColumn:@"image_id"];
        model.image_path = [result stringForColumn:@"image_path"];
    }
    [db close];
    return  model;
}

@end

vc

- (IBAction)addUserInfor:(UIButton *)sender {
    UserModel * model = [[UserModel alloc]init];
    model.identifie = 1111;
    model.name = @"刘哥哥";
    model.sex = @"男";
    model.age = 23;
    model.mobile = @"13612345678";
    model.image_id = 123;
    model.image_path = @"http://ww2.sinaimg.cn/mw690/95a6ddc2gw1f9pl2eeycpj20j60l7mz7.jpg";
    [[UserDataManger shareInstance]insertUserData:model];;
}
- (IBAction)search:(UIButton *)sender {
    UserModel * model = [[UserDataManger shareInstance]getUserInfor];
    NSLog(@"%@",model.name);
}