把数组格式数据转换成字符串存入数据库

+ (NSString *)cutpicArrayTransformStringByMoinid:(NSString *)monid{
NSString *ns=nil;

NSMutableArray *cutPic=[[NSMutableArray alloc] init];
NSArray *cutpicArray=[LocalVideoData fetchWithMonid:monid];
for (int i=0; i<cutpicArray.count; i++) {
LocalVideoData *data=cutpicArray[i];
[cutPic addObject:[NSString stringWithFormat:@"%@##%@",data.startTime,data.imageFilePath]];
}
if (cutPic.count>0) {
ns=[cutPic componentsJoinedByString:@"===="];
}

return ns;
}