iOS FMDB Sqlite 包装器。记不清

Question

以下代码：

-(NSArray *)getContentsWithContextTypes:(NSArray *)contextTypes
                            contextData:(NSArray *)contextData
{
    __block NSString *query = @"SELECT * FROM Texts_original1 WHERE ";
    [contextData enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
        NSString *attributeName = [self.contextTypeToDBQueryTexts          
                                        objectForKey:contextTypes[idx]];
        query = [query stringByAppendingFormat:@"%@ = \"%@\"", attributeName, obj];
        if(idx != contextData.count - 1)
        {
            query = [query stringByAppendingString:@" AND "];
        }
    }];

    [self.db open];
    FMResultSet *results = [self.db executeQuery:query];
    NSMutableArray *array = [NSMutableArray array];

    while([results next])
    {
        Content *content = [[TextualContent alloc] initWithResults:results];
        [array addObject:content];
    }

    [self.db close];
    return array;
}

运行时产生以下错误：

调用 sqlite3_step 时出错（21：内存不足）rs

它发生在循环的一半。应该有 33 个结果。 17 之后我得到那个错误并且循环退出。有任何想法吗？谢谢。

Answer 1

了解您关闭 FMResultSet 对象很重要，因为它会导致内存问题。 如下操作，[resultSet close]

我没有进入你的代码逻辑，但是，我将对数据库代码进行一些修改。

尝试以下方法：

-(NSArray *)getContentsWithContextTypes:(NSArray *)contextTypes
                        contextData:(NSArray *)contextData
{
 __block NSString *query = @"SELECT * FROM Texts_original1 WHERE ";
 [contextData enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) 
   {
     NSString *attributeName = [self.contextTypeToDBQueryTexts          
                                    objectForKey:contextTypes[idx]];
     query = [query stringByAppendingFormat:@"%@ = \"%@\"", attributeName, obj];
     if(idx != contextData.count - 1)
     {
        query = [query stringByAppendingString:@" AND "];
     }
  }];

self.db = [FMDatabase databaseWithPath:[self getDBPath]];    

if(![db open])
{
  NSLog(@"Could not open DB");
  return nil;
} 

FMResultSet *results = [self.db executeQuery:query];
NSMutableArray *array = [NSMutableArray array];

while([results next])
{
    Content *content = [[TextualContent alloc] initWithResults:results];
    [array addObject:content];
}

[results close]; //VERY IMPORTANT!
[self.db close];
return array;

}