iOS + sqlite 问题 (EXC_BAD_ACCESS)

Question

我有一个很奇怪的。我有一个工作得很好的方法，但我正在尝试将其转换为使数据更多地由数据库驱动，而不是当前存在的硬编码。当我添加对我的数据库方法的调用以提取数据时，在数据库完成后很长时间我得到了一个 EXC_BAD_ACCESS。我已将其范围缩小到数据库内容，因为如果我根本不进行调用，就不会发生崩溃。

因此，对该方法的调用如下所示（如果我注释掉，它不会崩溃）：

NSString *thisRoomNumber = [self readLocationsFromDatabaseBetweenPoints:fX YPoint:fY];

方法本身如下所示：

    #pragma mark -
#pragma mark SQL Operations
- (NSString *)readLocationsFromDatabaseBetweenPoints:(float)tapPointX YPoint:(float)tapPointY{

    // Setup some globals
    databaseName = @"db.sqlite";

    // Get the path to the documents directory and append the databaseName
    NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDir = [documentPaths objectAtIndex:0];
    databasePath = [documentsDir stringByAppendingPathComponent:databaseName];

    // Setup the database object
    sqlite3 *database;

    NSString *sqlStringBuilder = [NSString stringWithFormat:@"select * from floors where propertyid = ? and floorid = ? and %f between topleftxcoord and bottomrightxcoord and %f between topleftycoord and bottomrightycoord", tapPointX, tapPointY];

    NSString *roomNumber = @"0";

    // Open the database from the users filessytem
    if(sqlite3_open([databasePath UTF8String], &database) == SQLITE_OK) {
        // Setup the SQL Statement and compile it for faster access
        const char *sqlStatement =  [sqlStringBuilder UTF8String];

        NSLog(@"%@", [NSString stringWithUTF8String:sqlStatement]);

        sqlite3_stmt *compiledStatement;
        if(sqlite3_prepare_v2(database, sqlStatement, -1, &compiledStatement, NULL) == SQLITE_OK) {
            sqlite3_bind_int(compiledStatement, 1, iPropertyId);
            sqlite3_bind_int(compiledStatement, 2, iFloorId);           

            // Loop through the results and add them to the feeds array
            while(sqlite3_step(compiledStatement) == SQLITE_ROW) {
                // Read the data from the result row
                NSInteger aLocId = sqlite3_column_int(compiledStatement, 0);
                NSInteger aTLX = sqlite3_column_int(compiledStatement, 1);
                NSInteger aTLY = sqlite3_column_int(compiledStatement, 2);
                NSInteger aBRX = sqlite3_column_int(compiledStatement, 3);
                NSInteger aBRY = sqlite3_column_int(compiledStatement, 4);
                NSString *aRoomIdent = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 5)];

                roomNumber = aRoomIdent;

            }
        }else{
            NSLog(@"%d", sqlite3_prepare_v2(database, sqlStatement, -1, &compiledStatement, NULL));
        }
        // Release the compiled statement from memory
        sqlite3_finalize(compiledStatement);

    }
    sqlite3_close(database);


    [documentsDir release];
    [documentPaths release];
    //[roomNumber release];
    [sqlStringBuilder release];

    return roomNumber;
}

调用本身运行良好。我得到了预期的结果，“thisRoomNumber”返回了我期望的结果。一旦调用方法跳到下一部分，它就会返回到委托，此时它会崩溃。我知道如果不使用大量代码，很难看到发生了什么，但绝对数量的代码会让这篇文章变得非常庞大。

希望这将为我们提供解决此问题的起点。此外，崩溃日志转储对此毫无用处。

感谢你们提供的任何帮助！如果您需要更多信息，请告诉我，我会根据需要尽力添加。

Answer 1

您最后的发布电话是问题所在。您正在释放不属于您的对象。删除它们，您应该会没事的。