Iphone中Sqlite的使用

Sqlite的访问:

NoteSqlite:

#import <Foundation/Foundation.h>
@class SqliteEntity;
#import "sqlite3.h"

@interface NoteSqlite : NSObject{
    NSString *databaseName;  //操作的数据库名
    NSString *TableName;    //操作的表名
    sqlite3 *database;
    sqlite3_stmt *statement;
    char *errorMsg;     //错误信息
    SqliteEntity *entitys;
}

@property (nonatomic,retain) NSString *_Execsql;
@property (nonatomic,retain) NSString *TableName;
@property (nonatomic,retain) NSString *databaseName;

//打开数据库
-(BOOL)Open;
//关闭数据库
-(BOOL)Close;

//创建表
-(BOOL)create;

//增加、删除、修改、查询
-(BOOL)insertDataForSql;
-(BOOL)deleteAll;
-(BOOL)deleteDataForSql;
-(BOOL)updateDataForSql;

-(SqliteEntity *)selectAll;
-(NSMutableArray *)selectForSql;

@end

#import "NoteSqlite.h"
#import "SqliteEntity.h"

@implementation NoteSqlite

- (id)init
{
    self = [super init];
    return self;
}

//打开数据库
-(BOOL)Open{
    NSArray *paths=NSSearchPathForDirectoriesInDomains(NSDocumentationDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory=[paths objectAtIndex:0];
    NSString *path=[documentsDirectory stringByAppendingPathComponent:databaseName];
    NSFileManager *fileManger=[NSFileManager defaultManager];
    BOOL find=[fileManger fileExistsAtPath:path];
    //判断文件是否存在
    if (find) {
        NSLog(@"数据库文件已经存在");
        //打开数据库、返回操作是否正确
        if(sqlite3_open([path UTF8String], &database)==SQLITE_OK){
            NSLog(@"成功打开数据库");
        }
        return YES;
    }else{
        if(sqlite3_open([path UTF8String], &database)==SQLITE_OK){
            //调用createMusicList创建数据库和表
            [self create];
            return YES;
        }else{
            sqlite3_close(database);
            NSLog(@"Error:open database file.");
            return NO;
        }
        return NO;
    }
}

//创建表
-(BOOL)create{
    if ([self ExecSql]) {
        NSLog(@"create Ok.");
        return YES;
    }
    return NO;
}

#pragma mark --新增、删除、修改、查询
-(BOOL)insertDataForSql{
    if ([self ExecSql]) {
        NSLog(@"Insert Ok.");
        return YES;
    }
    return NO;
}

-(BOOL)deleteAll{
    self._Execsql=[NSString stringWithFormat:@"Delete from %@",_TableName];
    if ([self ExecSql]) {
        NSLog(@"Delete All Ok");
        return YES;
    }
    return NO;
}

-(BOOL)deleteDataForSql{
    if ([self ExecSql]) {
        NSLog(@"Delete Ok");
        return YES;
    }
    return NO;
}

-(BOOL)updateDataForSql{
    if ([self ExecSql]) {
        NSLog(@"Update Ok");
        return YES;
    }
    return NO;
}

-(NSMutableArray *)selecteAll{
    self._Execsql=[NSString stringWithFormat:@" select * from %@",TableName];
    entitys.array= [self ExecSlect];
    return entitys.array;
}

-(NSMutableArray *)selectForSql{
    entitys.array= [self ExecSlect];
    return entitys.array;
}


#pragma mark --sql语句执行(Insert,Update,delete)
-(BOOL)ExecSql{
    const char *execsql=[self._Execsql UTF8String];
    if (sqlite3_exec(database, execsql, NULL, NULL, &errorMsg)==SQLITE_OK) {
        NSLog(@"执行语句成功");
        return YES;
    }
    NSLog(@"Error : %s",errorMsg);
    sqlite3_free(errorMsg);
    return NO;
}

#pragma mark --Sql语句查询
-(NSMutableArray *)ExecSlect{
    
    entitys=[[[SqliteEntity alloc]init]autorelease];
    entitys.array=[NSMutableArray arrayWithCapacity:6];
    
    const char *selectstr=[self._Execsql UTF8String];
    if (sqlite3_prepare_v2(database, selectstr, -1, &statement, Nil)==SQLITE_OK) {
        NSLog(@"SELECT OK");
        //添加返回的数据
        while (sqlite3_step(statement)==SQLITE_ROW) {
            SqliteEntity *entity=[[SqliteEntity alloc]init];
            
            entity.catid=sqlite3_column_int(statement, 0);
            entity.parentid=sqlite3_column_int(statement, 1);
            entity.ordering=sqlite3_column_int(statement, 4);
            
            entity.title=[NSString stringWithCString:(char *)sqlite3_column_text(statement, 2) encoding:NSUTF8StringEncoding];
            entity.entrytype=[NSString stringWithCString:(char *)sqlite3_column_text(statement, 3) encoding:NSUTF8StringEncoding];
            
            //字符串格式化和截取
            //NSDateFormatter *fomater=[[NSDateFormatter alloc]init];
            //[fomater setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
            //NSData *ndate=[[fomater dateFromString:[entity.title substringToIndex:[entity.title length-5]]];
            
            //添加数据集
            
            
            NSMutableDictionary *dic=  [NSMutableDictionary dictionaryWithObjectsAndKeys:
                                        [NSString stringWithFormat:@"%d",entity.catid],@"catid",
                                        [NSString stringWithFormat:@"%d",entity.parentid],@"parentid",
                                        entity.title,@"title",
                                        entity.entrytype,@"entrytype",
                                        [NSString stringWithFormat:@"%d",entity.ordering],@"ordering",nil];
            
            [entitys.array insertObject:dic atIndex:[entitys.array count]];
                        
            [entity release];
        }
        return entitys.array;
    }
    return entitys.array;
}


@end

SqliteEntity:

#import <Foundation/Foundation.h>

@interface SqliteEntity : NSObject

@property(nonatomic,readwrite) int catid;
@property(nonatomic,readwrite) int parentid;
@property(nonatomic,retain) NSString *title;
@property(nonatomic,retain) NSString *entrytype;
@property(nonatomic,readwrite) int ordering;
@property(nonatomic,assign) NSMutableArray *array;  //返回从数据库中取到的数据集
@end

Sqlite访问测试:

#import <UIKit/UIKit.h>
#import "NoteSqlite.h"

@interface DatabaseViewController : UITableViewController{
    NoteSqlite *sqlite;
    SqliteEntity *entity;
    NSMutableArray *DataList;
}

@end

//
//  DatabaseViewController.m
//  UserSQLite
//
//  Created by Liaoyang on 13-10-5.
//  Copyright (c) 2013年 Liaoyang. All rights reserved.
//

#import "DatabaseViewController.h"
#import "NoteSqlite.h"
#import "SqliteEntity.h"
#import "DetilViewController.h"

@interface DatabaseViewController ()

@end

@implementation DatabaseViewController

- (id)initWithStyle:(UITableViewStyle)style
{
    self = [super initWithStyle:style];
    if (self) {
        //读取数据库,准备好数据信息
        
        sqlite=[[NoteSqlite alloc]init];
        sqlite.databaseName=@"IphoneDb";
        //创建表sql
        sqlite._Execsql=@"create table MenuItems (catid int(5),parentid int(5),title varchar(32),entrytype varchar(12),ordering int(5))";
        
        [sqlite Open];      //打开数据库(或创建数据库)
        
        sqlite.TableName=@"MenuItems";
        
        if ([sqlite create]) {
            [sqlite deleteAll];
            //插入数据
            sqlite._Execsql=@"insert into MenuItems (catid,parentid,title,entrytype,ordering) values (1,0,'First','category',1),(2,0,'Third','categroy',3),(3,0,'Second','categroy',2),(4,2,'Submenu','category',1),(5,0,'Action #1','result',4),(6,1,'Action #1B','result',1) ";
            //数据插入
            [sqlite insertDataForSql];
        }
        
        sqlite._Execsql=@"select * from MenuItems where parentid=0 order by ordering asc";
        DataList= [sqlite selectForSql];
        if ([DataList count]>0) {   //将表格下移动
            CGPoint tablecenter=self.view.center;
            self.view.center=CGPointMake(tablecenter.x, tablecenter.y+22);
            [DataList retain];
        }
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];

}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return [DataList count];
}

-(NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section{
    return @"GetDataBase";
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
    }
    
    cell.textLabel.text=[[DataList objectAtIndex:indexPath.row]objectForKey:@"title"];
    if ([DataList objectAtIndex:indexPath.row]) {
        cell.accessoryType=UITableViewCellAccessoryDisclosureIndicator;
    }
    
    return cell;
}

#pragma mark - Table view delegate

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    entity=[DataList objectAtIndex:indexPath.row];
    DetilViewController *detail= [[DetilViewController alloc] init];
     detail.title=[[DataList objectAtIndex:indexPath.row]objectForKey:@"title"];
    
    [self.view addSubview:detail.view];
    [self.navigationController pushViewController:detail animated:YES];
    [detail release];
         
}

@end