问题描述

打开SQlite数据库的时候报错

用嵌入SQLite数据库开发ios应用，我把数据库放到SQlite管理员，然后拖到Xcode工程中。但是当我打开DB的时候，报错 out of memory ，不知道是不是SQlite的bug，因为我的文件很小，应该不会报出内存问题。

初始化数据库的代码：

- (id)initWithPath:(NSString *)path {
if (self = [super init]) {
    BOOL success;
    NSError *error;
    NSFileManager *fileManager = [NSFileManager defaultManager];
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *dbPath = [documentsDirectory stringByAppendingPathComponent:@"SoundLib_DB.sqlite"];

    if ([fileManager fileExistsAtPath:dbPath] == NO) {
        NSString *resourcePath = [[NSBundle mainBundle] pathForResource:@"SoundLib_DB" ofType:@"sqlite"];
        [fileManager copyItemAtPath:resourcePath toPath:dbPath error:&error];
    }

    success = [fileManager fileExistsAtPath:dbPath];
    if(!success)
    {
        NSLog(@"Cannot locate database file '%@'.", dbPath);
    }
    sqlite3 *dbConnection;
//Here is when I get the error, at trying to open the DB
    if (sqlite3_open_v2("SoundLib", &dbConnection, SQLITE_OPEN_READWRITE, NULL) != SQLITE_OK) {
        NSLog(@"[SQLITE] Unable to open database!");
        NSLog(@"%s Prepare failure '%s' (%1d)", __FUNCTION__, sqlite3_errmsg(database), sqlite3_errcode(database));
        return nil;
    }
    database = dbConnection;
}
return self;
}

解决方案

报错可能是由于数据库路径传递为UTF8String，我看见你传递"SoundLib"，不能这样直接传递。

 if (sqlite3_open([dbPath UTF8String], &databaseHandle) == SQLITE_OK)
{
   //dbPath is your full database path you getting above
}

P.S.dbpath作为const char

const char *dbpath

解决方案二：

应该是你忘了 UTF8String

sqlite3 *database;
int result = sqlite3_open([dbPath UTF8String], &database);
if (result != SQLITE_OK) {
    sqlite3_close(database);
    NSLog(@"Error opening databse");
    return;
}