FMDB iphone數據庫

FMDB提供了用Objective-c封裝的訪問sqlite３的方法，避免了在用Objective-c編程中夾雜Ｃ風格的代碼（不是說不能使用，而是夾雜在一塊代碼風格不一致）。
https://github.com/ccgus/fmdb

#import  "FMDatabase.h"

#import "FMDatabaseAdditions.h"

 

@class FMDatabase;

 

@interface SqliteInterface : NSObject {

    NSString *dbRealPath;

    FMDatabase *dbo;

}

 

@property (nonatomic, retain) NSString *dbRealPath;

@property (nonatomic, retain) FMDatabase *dbo;

 

+ (SqliteInterface *)sharedSqliteInterface;

- (void) connectDB;

- (void) closeDB;

- (void) setupDB : (NSString *)dbFileName;

 

@end

 

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

SqliteInterface.m

 

#import "SqliteInterface.h"

#import "CommonDefines.h"

 

@implementation SqliteInterface

 

@synthesize dbRealPath, dbo;

 

static SqliteInterface *sharedSqliteInterface;

 

+ (SqliteInterface *)sharedSqliteInterface

{

    if (!sharedSqliteInterface) {

        sharedSqliteInterface = [[SqliteInterface alloc] init];

    }

    return sharedSqliteInterface;

}

 

- (void) connectDB

{

    if (dbo == nil) {

        dbo = [[FMDatabase alloc] initWithPath:dbRealPath];

        if (! [dbo open]) {

            NSLog(@"Could not open database.");

        }

    }else {

        NSLog(@"Database has already opened.");

    }

}

 

- (void) closeDB

{

    [dbo close];

    BR_RELEASE(dbo);

}

 

- (void) setupDB:(NSString *)dbFileName

{

    if (dbFileName == nil) {

        return;

    }

 

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

    NSString *documentsPath = [paths objectAtIndex:0];

    NSFileManager *fileManager = [NSFileManager defaultManager];

    NSError *err;

 

    dbRealPath = [documentsPath stringByAppendingString:[NSString stringWithFormat:@"/%@",dbFileName]];

 

    if (![fileManager fileExistsAtPath:dbRealPath]) {

        NSString *dbSrcPath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:dbFileName];

        BOOL copySuccess = [fileManager copyItemAtPath:dbSrcPath toPath:dbRealPath error:&err];

 

        if (!copySuccess) {

            NSLog(@"Failed to copy database '%@'.", [err localizedDescription]);

        }

    }

    NSLog(@"dbRealPath:%@",dbRealPath);

}

@end

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

AppDelege.m

 

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

 

    // Override point for customization after application launch.

 

    [[SqliteInterface sharedSqliteInterface] setupDB: @"xxxxx.sqlite"];

    [[SqliteInterface sharedSqliteInterface] connectDB];

}

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

最後，記得加入libsqlite3.dylib。然後加入對應的object和Model來對數據庫操作。

 

#import "MarkedPageModel.h"

#import "SqliteInterface.h"

#import "CommonDefines.h"

 

@implementation MarkedPageModel

 

- (NSMutableArray *)getMarkedPages

{

    FMDatabase *dbo = [SqliteInterface sharedSqliteInterface].dbo;

    NSMutableArray *resultArray = nil;

 

    NSString *selectSql = @"SELECT * FROM markedPage";

    FMResultSet *rs = [dbo executeQuery:selectSql];

 

    while ([rs next]) {

        if (resultArray == nil) {

            resultArray = [[[NSMutableArray alloc] init] autorelease];

        }

        MarkedPageObject *markedPageObject = [[MarkedPageObject alloc] init];

        markedPageObject.markedPage = [rs intForColumn:@"markedPage"];

        markedPageObject.markedTime = [rs stringForColumn:@"markedTime"];

        markedPageObject.isMarked = [rs boolForColumn:@"isMarked"];

        [resultArray addObject:markedPageObject];

        BR_RELEASE(markedPageObject);

    }

    [rs close];

    return resultArray;

}

 

- (BOOL)AddMarkedPage:(int)page

           MarkedTime:(NSString *)time

             isMarked: (BOOL)marked

{

    FMDatabase *dbo = [SqliteInterface sharedSqliteInterface].dbo;

    NSString *selectSql = @"INSERT INTO markedPage (markedPage,markedTime,isMarked) VALUES (?,?,?)";

    return [dbo executeUpdate:selectSql

          withArgumentsInArray:[NSArray arrayWithObjects:

                                [NSNumber numberWithInt:page], time, [NSNumber numberWithBool:marked],nil]];

}

 

- (BOOL)deleteMarkedPage:(int)page

{

    FMDatabase *dbo = [[SqliteInterface sharedSqliteInterface] dbo];

    NSString *deleteSql = @"DELETE FROM markedPage WHERE markedPage = ?";

    return [dbo executeUpdate:deleteSql withArgumentsInArray:[NSArray arrayWithObjects:

                                                              [NSNumber numberWithInt:page], nil]];

}

 

@end