iOS FMDB

//
//  Person.h
//  FMDB
//
//  Created by admin on 16/1/19.
//  Copyright © 2016年 123. All rights reserved.
//

#import <Foundation/Foundation.h>
@interface Person : NSObject
@property (nonatomic,assign)int schoolID;
@property (nonatomic,retain)NSString *name;
@property (nonatomic,retain)NSData *imageData;
+(Person *)personWithName:(NSString *)name schoolID:(int)schoolID imagedata:(NSData *)data;
@end

//
//  Person.m
//  FMDB
//
//  Created by admin on 16/1/19.
//  Copyright © 2016年 123. All rights reserved.
//

#import "Person.h"
@interface Person()

@end
@implementation Person
+(Person *)personWithName:(NSString *)name schoolID:(int)schoolID imagedata:(NSData *)data
{
    Person *per = [[Person alloc]init];
    per.name = name;
    per.schoolID = schoolID;
    per.imageData = data;
    return per;
}
@end

//
//  SaveData.h
//  FMDB
//
//  Created by admin on 16/1/19.
//  Copyright © 2016年 123. All rights reserved.
//

#import <Foundation/Foundation.h>
#import "FMDB.h"
#import "Person.h"
@interface SaveData : NSObject
//通过这个方法可以获取一个单例的对象
+(SaveData *)shareObj;

-(void)createTable;
-(NSString *)getSavePath;
/******  增  ******/
-(BOOL)insertPerson:(Person *)aPerson;
/******  删  ******/
-(BOOL)deletePerson:(NSString *)personName;
/******  改  ******/
-(BOOL)updatePerson:(Person *)aPerson;
/******  查  ******/
-(NSArray *)queryPerson;
@end

//
//  SaveData.m
//  FMDB
//
//  Created by admin on 16/1/19.
//  Copyright © 2016年 123. All rights reserved.
//

#import "SaveData.h"

@interface SaveData ()

@property(nonatomic,strong)FMDatabase *fmdb;

@end

@implementation SaveData
//通过这个方法可以获取一个单例的对象
+(SaveData *)shareObj
{
    //声明一个静态的  Singel 对象
    static SaveData *sharedInstance = nil;
    static dispatch_once_t onceToken;
    //保证block里的代码只执行一次（进行原子操作）
    dispatch_once(&onceToken, ^{
        sharedInstance = [[SaveData alloc] init];
    });
    return sharedInstance;
}


#pragma mark - 获取保存路径
-(NSString *)getSavePath
{
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *path = [paths firstObject];
    NSString *dbPath = [path stringByAppendingPathComponent:@"fileName.db"];
    return dbPath;
}
#pragma mark - 获取数据库
-(void)getFMDBDataBase
{
    //判断数据库是否存在
    if (!self.fmdb)
    {
        //如果不存在就创建一个数据库
        self.fmdb = [FMDatabase databaseWithPath:[self getSavePath]];
    }
}
#pragma mark - 获取存储表
-(void)createTable
{
    if (![self operationBeforeSaveData])
        return;
    //创建文件管理对象
    NSFileManager *fm = [NSFileManager defaultManager];
    //如果存储表不可执行
    if (![fm isExecutableFileAtPath:[self getSavePath]])
    {
        //http://www.runoob.com/sqlite/sqlite-data-types.html
        //
        //创建以张表
        BOOL isSuccess = [self.fmdb executeUpdate:@"create table if not exists testTable(ID INTEGER PRIMARY KEY AUTOINCREMENT, schoolID int,perName text,imageData BLOB)"];
        
        /* 仅作提示 */
        if (isSuccess)
            NSLog(@"创建表成功");
        else
            NSLog(@"创建表失败");
    }
    else
    {
        NSLog(@"**** 此时表已经存在无需创建  ****");
    }
}
#pragma mark - 在操作数据库前的 需要处理的事情
-(BOOL)operationBeforeSaveData
{
    //获取数据库，在它内部，实现了如果不存在自动创建
    [self getFMDBDataBase];
    
    //开启数据库
    if (![self.fmdb open]) {
        NSLog(@"开启数据库失败");
        return NO;
    }
    
    //为数据库设置缓存，提高查询效率
    [self.fmdb setShouldCacheStatements:YES];
    
    return YES;
}

#pragma mark - 增
-(BOOL)insertPerson:(Person *)aPerson
{
    if (![self operationBeforeSaveData])
        return NO;
    /*
     向表中加入数据
     1.先在表中查找有没有相同的元素在表中
     2.如果有 则对其进行修改
     3.如果没有 则向表中插入一条
     */
    FMResultSet *set = [self.fmdb executeQuery:@"select * from testTable where perName = ?",aPerson.name];
    if ([set next])//表格中找到了与插入数据相同的元素--通过唯一标识name来判断
    {
        //更新数据
        [self.fmdb executeUpdate:@"update testTable set perName = ?,imageData = ? where schoolID = ?",aPerson.name,aPerson.imageData,[NSString stringWithFormat:@"%d",aPerson.schoolID]];
        [self.fmdb close];
        //如果SQL语句执行成功
        return YES;
    }
    else//在表中没有找到与将要插入数据相同的元素
    {
        [self.fmdb executeUpdate:@"insert into testTable (perName,schoolID,imageData) values (?,?,?)",aPerson.name,[NSNumber numberWithInt:aPerson.schoolID],aPerson.imageData];
            [self.fmdb close];
            //SQL 语句执行失败
        return YES;
    }
}
#pragma mark -  删
-(BOOL)deletePerson:(NSString *)personName
{
    if (![self operationBeforeSaveData])
        return NO;
    /*
     1.删除操作首先找要删除的数据是否在表中
     2.如果在表中则执行删除操作
     3.如果不在表中则无需操作直接关闭数据库返回
     */
    FMResultSet *set = [self.fmdb executeQuery:@"select * from testTable where perName = ?",personName];
    if ([set next])//数据库中找到了
    {
        //删除数据
        [self.fmdb executeUpdate:@"delete from testTable where perName = ?",personName];
    }
    //关闭数据库
    [self.fmdb close];
    return YES;
}
#pragma mark -  改
-(BOOL)updatePerson:(Person *)aPerson
{
    if (![self operationBeforeSaveData])
        return NO;
    /*
     修改数据
     1.查找需要修改的数据是否存在
     2.如果不存在则 关闭数据库  返回不做其他处理
     3.如果存在则用新数据替换掉旧数据
     */
    
    FMResultSet *set = [self.fmdb executeQuery:@"select * from testTable where perName = ?",aPerson.name];
    if ([set next])//数据库中找到了
    {
        [self.fmdb executeUpdate:@"update testTable set schoolID = ?,imageData = ? where perName = ? ",[NSString stringWithFormat:@"%d",aPerson.schoolID],aPerson.imageData,aPerson.name];
    }
    [self.fmdb close];
    return YES;
}
#pragma mark -  查
-(NSArray *)queryPerson
{
    if (![self operationBeforeSaveData])
        return nil;
    NSMutableArray *arr = [NSMutableArray arrayWithCapacity:0];
    
    FMResultSet *set = [self.fmdb executeQuery:@"select * from testTable"];
    while ([set next])
    {
        Person *per = [[Person alloc]init];
        per.name = [set stringForColumn:@"perName"];
        per.schoolID = [set intForColumn:@"schoolID"];
        per.imageData = [set dataForColumn:@"imageData"];
        [arr addObject:per];
    }
    [self.fmdb close];
    return arr;
}
#pragma mark -  模糊查找数据
-(NSArray *)queryByUnclearName:(NSString *)name
{
    if (![self operationBeforeSaveData])
        return nil;
    NSMutableArray *arr = [NSMutableArray arrayWithCapacity:0];
    NSString *nameLike = [NSString stringWithFormat:@"%@%%",name];
    FMResultSet *set = [self.fmdb executeQuery:@"select * from testTable where perName like ?",nameLike];
    while ([set next])
    {
        Person *per = [[Person alloc]init];
        per.name = [set stringForColumn:@"perName"];
        per.schoolID = [set intForColumn:@"schoolID"];
        per.imageData = [set dataForColumn:@"imageData"];
        [arr addObject:per];
    }
    [self.fmdb close];
    return arr;
}

@end

//
//  ViewController.m
//  FMDB
//
//  Created by admin on 16/1/18.
//  Copyright © 2016年 123. All rights reserved.
//

#import "ViewController.h"
#import "Person.h"
#import "SaveData.h"
@interface ViewController ()
@property(nonatomic,strong)FMDatabase *db;
@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    NSString *path = [[NSBundle mainBundle]pathForResource:@"3" ofType:@"png"];
    NSData *data = [NSData dataWithContentsOfFile:path];
    
    
    [[SaveData shareObj]createTable];
    for (int i = 0; i < 10; i++)
    {
        //添加
        Person *per  = [Person personWithName:[NSString stringWithFormat:@"person%d--name",i]schoolID:1000+i imagedata:data];
        [[SaveData shareObj]insertPerson:per];
    }
    
    //查询
    NSArray *arr = [[SaveData shareObj]queryPerson];
    for (Person *item in arr)
        NSLog(@" 1111111 -- name:%@  --  schoolID:%d -- ",item.name,item.schoolID);
    
    NSLog(@"\n\n\n\n");
    //删除
    [[SaveData shareObj]deletePerson:@"person0--name"];
    //再次查询
    NSArray *arr1 = [[SaveData shareObj]queryPerson];
    for (Person *item in arr1)
        NSLog(@" 222222 -- name:%@  --  schoolID:%d -- ",item.name,item.schoolID);
    
    NSLog(@"\n\n\n\n");
    //修改
     Person *per  = [Person personWithName:@"person1--name" schoolID:1234 imagedata:data];
    [[SaveData shareObj]updatePerson:per];
    
    //再次查询
    NSArray *arr2 = [[SaveData shareObj]queryPerson];
    for (Person *item in arr2)
        NSLog(@" 33333 -- name: %@ -- schoolID: %d --",item.name,item.schoolID);


    
}
@end