Question

我正在使用sqlite数据库，一切进展顺利。我在表中添加了4个条目，然后在我的xib文件中添加了textview。现在我希望这个数据应该从sqlite数据库中获取，该数据库放在项目的包中。但我没有得到如何从捆绑到目录路径调用此数据库。请帮我解决这个问题。

Answer 1

使用此代码：

首先调用此方法，该方法将检查数据库文件是否存储在文档目录中。如果不是它会将您的文件写入文档目录。

-(void)openDatabase {

    NSFileManager *fileManager = [NSFileManager defaultManager];
    NSError *error = nil;
    NSString *dbPath = [self getDBPath];

    BOOL success = [fileManager fileExistsAtPath:dbPath];
    if(!success) {
        NSString *defaultDBPath = [[[NSBundle mainBundle] resourcePath] 
                                   stringByAppendingPathComponent:@"databasefilename.sqlite"];

        success = [fileManager copyItemAtPath:defaultDBPath toPath:dbPath
                                        error:&error];
        if (!success)
            NSLog(@"Failed to create writable database file with message '%@'.",
                      [error localizedDescription]);
    }
}

- (NSString *) getDBPath {
    //Search for standard documents using NSSearchPathForDirectoriesInDomains
    //First Param = Searching the documents directory
    //Second Param = Searching the Users directory and not the System
    //Expand any tildes and identify home directories.
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory ,
                                                             NSUserDomainMask, YES);
    NSString *documentsDir = [paths objectAtIndex:0];
    return [documentsDir stringByAppendingPathComponent:@"databasefilename.sqlite"];
}

然后检查Appdelegate或您想要的任何其他课程：

if (sqlite3_open([[self getDBPath] UTF8String], &YOUR_SQLITE3_OBJECT) == SQLITE_OK) {
    NSLog(@"database opened successfully");
}

从bundle调用sqlite数据库

1 个答案: