IOS 数据库FMDB(四)- (增、删、改、查)

参考:http://wenku.baidu.com/link?url=TK90OOhfVLK_2N5ZalNS5-hB_a5_Bxb7WLCx5ryzfOxHkCw8mW7tMAe63s-lpP0gzh7sytZ8cYuWabYbjMLPlxkm9cbZiphxE1sVDHbgMBa

依赖库: libsqlte3.0

 //
 //  ViewController.m
 //  FMDBDemo
 // FMDB有三个主要的类
 // FMDatabase一个FMDatabase对象就代表一个单独的SQLite数据库 用来执行SQL语句
 // FMResultSet使用FMDatabase执行查询后的结果集
 // FMDatabaseQueue用于在多线程中执行多个查询或更新，它是线程安全的
 //  Created by Jason on 15-2-16.
 //  Copyright (c) 2015年 eshore. All rights reserved.
 //

 static const char encodingChar[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";


 #import "ViewController.h"

 @interface ViewController (){

     NSString *__dataStr;
     NSData   *__imageData;
     NSArray  *__dataAry;
     NSString *__imageStr;

 }

 @end

 @implementation ViewController

 - (void)viewDidLoad
 {
     [super viewDidLoad];


     __dataStr = @"字符串";
     __dataAry = @[@"1",@"2"];
     __imageData  = [[NSData alloc]initWithContentsOfURL:[NSURL URLWithString:@"http://d.hiphotos.baidu.com/zhidao/pic/item/962bd40735fae6cd0009f9410eb30f2442a70f54.jpg"]];
     NSLog(@"===%@",__imageData);

     //第一种操作
     [self firDbUse];

     //第二种操作
     [self serMyDbUse];
 }




 /**
  * 第一种获取队列读取数据库方法 多线程 可以获取id
  * 创表和插入在队列里:FMDatabaseQueue
  *
  */
 -(void)firDbUse
 {
     //Documents 路径
     NSString *documenPath = [NSSearchPathForDirectoriesInDomains(NSDocumentationDirectory, NSUserDomainMask, YES) objectAtIndex:0];
     //db路径
     NSString *dbPath = [documenPath stringByAppendingString:@"mydbFile.db"];


     //获取数据库实例
     FMDatabaseQueue *dbQueue = [FMDatabaseQueue databaseQueueWithPath:dbPath];
 //    [_db executeUpdate:@"create table if not exists USER(id integer primary key autoincrement,name,score,image)"];
     //1.创建表 CREATE TABLE
     [dbQueue inDatabase:^(FMDatabase *db) {
         BOOL result=[db executeUpdate:@"CREATE TABLE IF NOT EXISTS t_person (id integer PRIMARY KEY AUTOINCREMENT, name text NOT NULL, age integer NOT NULL);"];
         if (result) {
             NSLog(@"创表成功");
         }else
         {
             NSLog(@"创表失败");
         }
     }];


     //2.插入数据 INSERT INTO
     [dbQueue inDatabase:^(FMDatabase *db) {
         [db executeUpdate:@"INSERT INTO t_person (name, age) VALUES (?, ?);",@"wendingding", @22];
         [db commit];

     }];

     //查询数据
     [dbQueue inDatabase:^(FMDatabase *db) {
         // 3.执行查询语句
         FMResultSet *resultSet = [db executeQuery:@"SELECT * FROM t_person"];

         // 4.遍历结果
         while ([resultSet next]) {
             int ID = [resultSet intForColumn:@"id"];
             NSString *name = [resultSet stringForColumn:@"name"];
             int age = [resultSet intForColumn:@"age"];
             NSLog(@"第一种:%d %@ %d", ID, name, age);
         }
     }];

     [dbQueue close];

 }



 /**
  * 第二种获取队列读取数据库方法
  *
  */
 -(void)serMyDbUse
 {
     //Documents 路径
     NSString *documenPath = [NSSearchPathForDirectoriesInDomains(NSDocumentationDirectory, NSUserDomainMask, YES) objectAtIndex:0];

     //db路径
     NSString *dbPath = [documenPath stringByAppendingString:@"serDBFile.db"];

     //获取数据库实例
     FMDatabase *db = [FMDatabase databaseWithPath:dbPath];

     //1.创建表 CREATE TABLE
     [db open];
 //    [db executeUpdate:@"CREATE TABLE User1 (Name text,Age text)"];
     [db executeUpdate:@"CREATE TABLE MyDBb1 (Name text,Age)"];

     [db executeUpdate:@"create table if not exists User1(id integer primary key autoincrement,name,age,image)"];

     //2.插入数据 INSERT INTO
     [db executeUpdate:@"INSERT INTO User1 (name, age) VALUES (?, ?);",@"字符111", __dataStr];
     [db executeUpdate:@"INSERT INTO User1 (name, age) VALUES (?, ?);",@"字符222", @"字符串2222"];


     [db executeUpdate:@"INSERT INTO MyDBb1 (name, age) VALUES (?, ?);",@"图片", __imageData];


     //3.替换更新数据 将“Jason”更改为“李四”
     [db executeUpdate:@"UPDATE MyDBb SET Name = ? WHERE Name = ? ",@"李四",@"Jason"];


     //4.删除数据
 //    [db executeUpdate:@"DELETE FROM User WHERE Name = ?",@"张三"];

     //5.查询数据
     //执行查询语句
     FMResultSet *resultSet = [db executeQuery:@"SELECT * FROM MyDBb1"];

     //遍历结果
     while ([resultSet next]) {
         int ID = [resultSet intForColumn:@"id"];
         NSString *name = [resultSet stringForColumn:@"name"];
         NSData *age = [resultSet dataForColumn:@"age"];
         NSLog(@"第二种1:%d %@ %@", ID, name, age);

         UIImageView *imageV = [[UIImageView alloc]initWithFrame:CGRectMake(100, 100, 150, 150)];
         imageV.image = [UIImage imageWithData:age];

         imageV.backgroundColor = [UIColor grayColor];

         [self.view addSubview:imageV];

     }

     FMResultSet *resultSet1 = [db executeQuery:@"SELECT * FROM User1"];

     //遍历结果
     while ([resultSet1 next]) {
         int ID = [resultSet1 intForColumn:@"id"];
         NSString *name = [resultSet1 stringForColumn:@"name"];
         NSString *age = [resultSet1 stringForColumn:@"age"];
         NSLog(@"第二种2:%d %@ %@", ID, name, age);


     }


 }


 @end