FMDB/SQLCipher數據庫管理

1. 安裝cocopods。http://my.oschina.net/u/2418942/blog/508913。

2. 安裝  pod "FMDB/SQLCipher"。若是安裝有問題，能夠先對cocopods進行update一下。

3. 修改FMDatabase文件。添加一個宏定義，修改2個方法。添加的代碼用_標出。把帶_的代碼刪除，便可恢復。

#define DB_SECRETKEY @"HPSQLDatabase"

- (BOOL)open {

    if (_db) {

        return YES;

    }

    

    int err = sqlite3_open([self sqlitePath], &_db );

    if(err != SQLITE_OK) {

        NSLog(@"error opening!: %d", err);

        return NO;

    }else if (err == SQLITE_OK)

    {

        [self setKey:DB_SECRETKEY];

    }

    

    if (_maxBusyRetryTimeInterval > 0.0) {

        // set the handler

        [self setMaxBusyRetryTimeInterval:_maxBusyRetryTimeInterval];

    }

    

    

    return YES;

}

- (BOOL)openWithFlags:(int)flags {

    if (_db) {

        return YES;

    }

    int err = sqlite3_open_v2([self sqlitePath], &_db, flags, NULL /* Name of VFS module to use */);

    if(err != SQLITE_OK) {

        NSLog(@"error opening!: %d", err);

        return NO;

    } else if (err == SQLITE_OK) {

        [self setKey:DB_SECRETKEY];

    }

    

    if (_maxBusyRetryTimeInterval > 0.0) {

        // set the handler

        [self setMaxBusyRetryTimeInterval:_maxBusyRetryTimeInterval];

    }

    

    return YES;

}

4. 創建sql語句文件。databasefile.sql

CREATE TABLE IF NOT EXISTS "databaseName" (

"did" INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,

"name" TEXT,

"createTime" TEXT

)

5. 創建SQLManager文件。SQLiteManager.h和SQLiteManager.m文件

+ (instancetype)sharedSQLiteManager {

    static SQLiteManager* manager;

    static dispatch_once_t onceToken;

    dispatch_once(&onceToken, ^{

        manager = [[SQLiteManager alloc] init];

        NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];

        path = [path stringByAppendingPathComponent:@"databaseName.db"];

        NSLog(@"SQLitePath ---- %@",path);

        manager.queue = [[FMDatabaseQueue alloc] initWithPath:path];

        [manager creatTable];

    });

    return manager;

}

- (void)creatTable {

        NSString* path = [[NSBundle mainBundle] pathForResource:@"databasefile.sql" ofType:nil];

        NSError* error;

        NSString* statement = [NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:&error];

        if (error != nil) {

            LogE(@"創表字符串錯誤 ----- %@",error);

        }

        

        [self.queue inTransaction:^(FMDatabase *db, BOOL *rollback) {

            if ([db executeUpdate:statement]) {

                NSLog(@"%@創表成功",sqlStr);

            }else{

                LogE(@"%@創表失敗",sqlStr);

                return;

            }

        }];

    }

}

- (void)openDateBase {

    NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];

    path = [path stringByAppendingPathComponent:@"databaseName.db"];

    FMDatabase *db =  [FMDatabase databaseWithPath:path];

    if (![db open]) {

        LogE(@"數據庫打開失敗！");

    }

}

- (void)closeDateBase {

    NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];

    path = [path stringByAppendingPathComponent:@"databaseName.db"];

    FMDatabase *db =  [FMDatabase databaseWithPath:path];

    if (![db close]) {

        LogE(@"數據庫關閉失敗！");

    }

}

// 獲取全部信息

- (NSMutableArray *)loadAll {

    [self openDateBase];

    NSString* loadStatement = @"SELECT * FROM databaseName ORDER BY did ASC;";

    NSMutableArray* tempArray = [NSMutableArray array];

    [self.queue inTransaction:^(FMDatabase *db, BOOL *rollback) {

        FMResultSet* result = [db executeQuery:loadStatement];

        while ([result next]) {

            Detail* detail = [[Detail alloc] init];

            detail.dId = [NSNumber numberWithInt:[result intForColumn:@"did"]];

            detail.name = [result stringForColumn:@"name"];

            detail.createTime = [result stringForColumn:@"createTime"];

            [tempArray detail];

        }

    }];

    [self closeDateBase];

    return tempArray;

}

// 插入數據

- (void)insertData:(Detail*)detail{

    

    [self openDateBase];

    NSString* insertStatement = @"INSERT INTO databaseName (name,createTime) VALUES (?,?);";

    [self.queue inTransaction:^(FMDatabase *db, BOOL *rollback) {

        if ([db executeUpdate:insertStatement withArgumentsInArray:@[detail.name,getail.createTime]]) {

            NSLog(@"添加成功");

        }else{

            LogE(@"添加失敗");

        }

    }];

    [self closeDateBase];

}

// 更新信息

- (void)updatedata:(Detail*)detail{

    NSString* updateStatement = @"UPDATE databaseName SET name = ? WHERE did = ?;";

    [self.queue inTransaction:^(FMDatabase *db, BOOL *rollback) {

        [db executeUpdate:updateStatement withArgumentsInArray:@[detail.name,detail.dId]];

    }];

}

// 刪除

- (void)deleteGroup:(Detail*)detail{

    

    NSString* deleteStatement = [NSString stringWithFormat:@"DELETE FROM databaseName WHERE did = ?;"];

    [self.queue inTransaction:^(FMDatabase *db, BOOL *rollback) {

        if ([db executeUpdate:deleteStatement withArgumentsInArray:@[detail.dId]]) {

            NSLog(@"刪除成功");

        }else {

            NSLog(@"刪除失敗");

        }

        

    }];

    

}

6. 在viewController調用

#import "SQLiteManager.h"

@property (strong, nonatomic) SQLiteManager *manager;

- (void)viewDidLoad {

    [super viewDidLoad];

    SQLiteManager *manager = [SQLiteManager sharedSQLiteManager];

    self.manager = manager;

｝

而後就能夠調用方法了。

7. 在本地文件夾中找到數據庫，用Navicat Premium 工具打開，會提示「file is encrypted or is not a database」。這表示你的數據庫已經加密了。（若是不作加密的那步驟，在這裏是能夠用工具打開數據庫的）。

8. 提示： 數據庫字段名字不能用group

   若是沒有加密創建的數據庫，想再加密，那麼必須把原有數據庫刪除，否則會報錯。