iOS數據庫之查找功能的實現
首先引入文件：
libsqlite3.
FMDB（包含Global.m，Global.h文件）
關閉arc
用mesaSqlite創建一個數據庫，引入文件中
其次：
首先，在Global.h文件中找到#define kDBName @"shuJu.db"，如果你建立的數據庫文件名為：liyongxing.db,那就將shuJu.db更改為liyongxing.db，然後再delegate裡的self.window下添加一行代碼copyMainBundleResourceToCacheDir(@"liyongxing.db");
OK，准備工作已經做好
再次，上代碼：
創建一個增刪改查的函數類：
//
// CaoZuoData.h
// shuJuKu
//
// Created by liyongxing on 13-7-31.
// Copyright (c) 2013年 liyongxing. All rights reserved.
//
#import <Foundation/Foundation.h>
#import "FMDatabase.h"
@class baoCunData;
@interface CaoZuoData : NSObject
//創建一個數據庫對象
@property (nonatomic ,strong) FMDatabase * sqlite3;
//創建一個數據中轉站的對象，數據中轉站就是臨時存放數據，做傳遞用的，最好一個數據類單獨創建一個
@property (nonatomic ,strong) baoCunData * baoCun;
//增添數據
-(void)insertData:(baoCunData * )data;
//刪除數據
-(void)delete:(NSString *)data;
//更改數據
//查找數據
-(NSMutableArray*) selectAll
@end
.m文件中
//
// CaoZuoData.m
// shuJuKu
//
// Created by liyongxing on 13-7-31.
// Copyright (c) 2013年 liyongxing. All rights reserved.
//
#import "CaoZuoData.h"
#import "Global.h"
#import "baoCunData.h"
@implementation CaoZuoData
-(id)init
{
if (self==[super init])
{
self.sqlite3 = [FMDatabase databaseWithPath:dbPath()];
[self.sqlite3 open];
}
return self;
}
#pragma mark-----增添數據
-(void)insertData:(baoCunData * )data
{
[self.sqlite3 executeUpdate:@"INSERT INTO lyxShuJu(name,number) VALUES (?,?)",data.nameData,data.numberData];
NSLog(@"data.nameData == %@",data.nameData);
NSLog(@"numberData == %@",data.numberData);
}
#pragma mark-----刪除數據
-(void)delete:(NSString *)data
{
}
#pragma mark-----更改數據
#pragma mark-----查找數據--將所有數據庫中查找到的值放在一個變動數組中
-(NSMutableArray*) selectAll
{
//從數據庫中調出所有值賦給字符串
NSString * query = @"SELECT * FROM lyxShuJu";
//將數據庫中的數據放到一個集合類FMResultSet中
FMResultSet *set = [self.sqlite3 executeQuery:query];
//創建一個動態數組
NSMutableArray *dataArr = [[NSMutableArray alloc]init];
//將集合中的數據循環取出，並賦給變動數組，返回值為這個變動數組
while ([set next])
{
baoCunData * data = [[baoCunData alloc]init];
data.nameData =[set stringForColumn:@"name"];
data.numberData = [set stringForColumn:@"number"];
[dataArr addObject:data];
}
return dataArr;
}
@end
建立一個保存數據的類
//
// baoCunData.h
// shuJuKu
//
// Created by liyongxing on 13-7-31.
// Copyright (c) 2013年 liyongxing. All rights reserved.
//
#import <Foundation/Foundation.h>
@interface baoCunData : NSObject
//一個姓名字符串
@property (nonatomic ,strong) NSString * nameData;
//號碼字符串（號碼中可能存在符號或者英文）
@property (nonatomic ,strong) NSString * numberData;
@end
.m中
//
// baoCunData.m
// shuJuKu
//
// Created by liyongxing on 13-7-31.
// Copyright (c) 2013年 liyongxing. All rights reserved.
//
#import "baoCunData.h"
@implementation baoCunData
-(id)init
{
if (self == [super init])
{
self.nameData = nil;
self.numberData = nil;
}
return self;
}
@end
//數據庫的引用類
.h文件
//
// LYXViewController.h
// shuJuKu
//
// Created by liyongxing on 13-7-31.
// Copyright (c) 2013年 liyongxing. All rights reserved.
//
#import <UIKit/UIKit.h>
@interface LYXViewController : UIViewController
@property(nonatomic ,strong) UITextField * nameFile;
@property (nonatomic ,strong) UITextField * numberFile;
@end
.m文件中
//
// LYXViewController.m
// shuJuKu
//
// Created by liyongxing on 13-7-31.
// Copyright (c) 2013年 liyongxing. All rights reserved.
//
#import "LYXViewController.h"
#import "baoCunData.h"
#import "FMDatabase.h"
#import "CaoZuoData.h"
@interface LYXViewController ()
@property (nonatomic ,strong) baoCunData * baoCunShuJu;
@property (nonatomic ,strong) CaoZuoData * sqlite;
@end
@implementation LYXViewController
- (void)viewDidLoad
{
[super viewDidLoad];
//創建一個增刪改查得類得對象
self.sqlite = [[CaoZuoData alloc]init];
//創建兩個輸入框
self.nameFile = [[UITextField alloc]initWithFrame:CGRectMake(50, 50, 150, 50)];
self.nameFile.backgroundColor = [UIColor greenColor];
[self.view addSubview:self.nameFile];
self.numberFile = [[UITextField alloc]initWithFrame:CGRectMake(50, 200, 150, 50)];
self.numberFile.backgroundColor = [UIColor redColor];
[self.view addSubview:self.numberFile];
UIButton * button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
button.frame = CGRectMake(100, 80, 50, 40);
button.backgroundColor = [UIColor redColor];
[button addTarget:self action:@selector(baoCunData) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button];
}
-(void)baoCunData
{
self.baoCunShuJu= [[baoCunData alloc]init];
self.baoCunShuJu.nameData = self.nameFile.text;
self.baoCunShuJu.numberData = self.numberFile.text;
[self.sqlite insertData:self.baoCunShuJu];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
