PLSqliteDatabase

#import "DataBase.h"
#import <PlausibleDatabase/PlausibleDatabase.h>

static PLSqliteDatabase * dbPointer;


@implementation DataBase

//单例

+ (PLSqliteDatabase *) setup{
	if (dbPointer) {
		return dbPointer;
	}
	
	NSLog(@"%@",NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES));
	NSString *documentPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
	NSString *realPath = [documentPath stringByAppendingPathComponent:@"book.sqlite"];
	
	NSString *sourcePath = [[NSBundle mainBundle] pathForResource:@"Book" ofType:@"sqlite"];
	
	NSFileManager *fileManager = [NSFileManager defaultManager];
	if (![fileManager fileExistsAtPath:realPath]) {
		NSError *error;
		if (![fileManager copyItemAtPath:sourcePath toPath:realPath error:&error]) {
			NSLog(@"%@",[error localizedDescription]);
		}
	}
	
	NSLog(@"复制sqlite到路径：%@成功。",realPath);
	
	//把dbpointer地址修改为可修改的realPath。
	dbPointer = [[PLSqliteDatabase alloc] initWithPath:realPath];
	
	[dbPointer open];
	
	return dbPointer;
}

+ (void) close{
	if (dbPointer) {
		[dbPointer close];
		dbPointer = NULL;
	}
}
@end

//查找table所有书籍的方法
+ (NSArray *) findAll{
	PLSqliteDatabase *dataBase = [DataBase setup];
	
	id<PLResultSet> rs;
	rs = [dataBase executeQuery:@"SELECT * FROM Book"];
	
	//定义一个数组存放所有书籍的信息
	NSMutableArray *books = [[NSMutableArray alloc] init];
	
	//把rs中的数据库信息遍历到books数组
	while ([rs next]) {
		NSString *ID = [rs objectForColumn:@"ID"];
		NSString *name = [rs objectForColumn:@"Name"];
		NSString *author = [rs objectForColumn:@"Author"];
		NSString *publishHouse = [rs objectForColumn:@"PublishHouse"];
		NSString *date = [rs objectForColumn:@"Date"];
		NSString *briefIntroducation = [rs objectForColumn:@"BriefIntroducation"];

		
		//初始化book 存放到books里面
		Book *book = [[Book alloc] initWithID:ID name:name publishHouse:publishHouse author:author briefIntroducation:briefIntroducation date:date];
		[books addObject:book];
		
		[book release];  
	}
	//关闭数据库
	[rs close];
	
	return books;
}

//根据ID搜索相关书籍的方法
+ (id) find:(NSInteger) ID{
	PLSqliteDatabase *dataBase = [DataBase setup];

	id<PLResultSet> rs;
	
	NSString *findSql = [NSString stringWithFormat:@"select * FROM Book WHERE ID = %d",ID];
	rs = [dataBase executeQuery:findSql];
	
	Book *book = nil;
	
	if([rs next]) {
		NSString *ID = [rs objectForColumn:@"ID"];
		NSString *name = [rs objectForColumn:@"Name"];
		NSString *author = [rs objectForColumn:@"Author"];
		NSString *publishHouse = [rs objectForColumn:@"PublishHouse"];
		NSString *date = [rs objectForColumn:@"Date"];
		NSString *briefIntroducation = [rs objectForColumn:@"BriefIntroducation"];
		
		book = [[Book alloc] initWithID:ID name:name publishHouse:publishHouse author:author briefIntroducation:briefIntroducation date:date];
	}
	else {
		UIAlertView *errorAlert = [[UIAlertView alloc] initWithTitle:@"Error" message:@"Can not find!" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
		[errorAlert show];
		NSLog(@"Error!!Can not find.");
		
		[errorAlert release];
	}
	
	[rs close];
	
	return [book autorelease];	
}

//查询当前有本书的方法
+ (int) count{
	
	PLSqliteDatabase *dataBase = [DataBase setup];
	int bookCount = 0;
	
	id<PLResultSet>rs;
	rs = [dataBase executeQuery:@"SELECT COUNT(*) AS EventCount FROM Event"];
	
	if ([rs next]) {
		bookCount = [[rs objectForColumn:@"BookCount"] intValue];
	}
	
	[rs close];
	
	return bookCount;
	
}

//修改某一本书籍的方法
+ (int) update:(NSString *)ID withName:(NSString *) name publishHouse:(NSString *) publishHouse author:(NSString *) author briefIntroducation:(NSString *)briefIntroducation  date:(NSString *) date{
	PLSqliteDatabase *dataBase = [DataBase setup];
    BOOL bResult = -1;
    @try {
        [dataBase beginTransaction];
        bResult = [dataBase executeUpdate: @"UPDATE Book SET name = ?, publishHouse = ?, author = ?, briefIntroducation = ?, date = ?",
                        ID,
                        name,
                        publishHouse,
                        author,
                        briefIntroducation,
                        date];
        [dataBase commitTransaction];
    }
    @catch (NSException *exception) {
        [dataBase rollbackTransaction];
    }
    @finally {
        
    }
	return bResult;
}

//创建新书籍的方法
+ (int) createWithID:(NSString *) ID name:(NSString *) name publishHouse:(NSString *) publishHouse author:(NSString *) author briefIntroducation:(NSString *)briefIntroducation  date:(NSString *) date1{
	PLSqliteDatabase *dataBase = [DataBase setup];
    
    BOOL bResult = [dataBase executeUpdate: @"INSERT INTO Book (ID, Name, PublishHouse, Author, BriefIntroducation, Date) VALUES (?,?,?,?,?,?)",
                    ID, 
                    name, 
					publishHouse,
					author,
                    briefIntroducation,
					date1];
	
	return bResult;
}


//删除书籍的方法
+ (int) delete:(NSString *) ID{
	PLSqliteDatabase *dataBase = [DataBase setup];
	
	BOOL bResult = [dataBase executeUpdate:@"DELETE FROM Book WHERE ID = ?",
					ID];
	
	return bResult;
}


//书籍这个类的初始化方法
- (id) initWithID:(NSString *) ID name:(NSString *) name publishHouse:(NSString *) publishHouse author:(NSString *) author briefIntroducation:(NSString *)briefIntroducation  date:(NSString *) date{
	if (self = [super init]) {
		_id = [ID retain];
		_name = [name retain];
		_publishHouse = [publishHouse retain];
		_author = [author retain];
		_briefIntroducation = [briefIntroducation retain];
		_date = [date retain];
	}
	return self;
}