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这里我有一个日期格式化程序的问题，实际上我有一个选项来搜索基于日期的事件。我将这个日期与数据库中的日期存储区进行比较，并获取基于事件的在日本我写的代码如下：与dateformatter在iphone中的问题sdk
-(NSMutableArray*)getSearchAllLists:(EventsList*)aEvent
{
[searchList removeAllObjects];
EventsList *searchEvent = nil;
const char* sql;
NSString *conditionStr = @" where ";
if([aEvent.eventName length] > 0)
{
NSString *str = @"'%";
str = [str stringByAppendingString:aEvent.eventName];
str = [str stringByAppendingString:@"%'"];
conditionStr = [conditionStr stringByAppendingString:[NSString stringWithFormat:@" eventName like %s",[str UTF8String]]];
}
if([aEvent.eventWineName length]>0)
{
NSString *str = @"'%";
str = [str stringByAppendingString:aEvent.eventWineName];
str = [str stringByAppendingString:@"%'"];
if([aEvent.eventName length]>0)
{
conditionStr = [conditionStr stringByAppendingString:[NSString stringWithFormat:@" and (wineName like %s)",[str UTF8String]]];
}
else
{
conditionStr = [conditionStr stringByAppendingString:[NSString stringWithFormat:@"wineName like %s",[str UTF8String]]];
}
}
if([aEvent.eventVariety length]>0)
{
NSString *str = @"'%";
str = [str stringByAppendingString:aEvent.eventVariety];
str = [str stringByAppendingString:@"%'"];
if([aEvent.eventName length]>0 || [aEvent.eventWineName length]>0)
{
conditionStr = [conditionStr stringByAppendingString:[NSString stringWithFormat:@" and (variety like %s)",[str UTF8String]]];
}
else
{
conditionStr = [conditionStr stringByAppendingString:[NSString stringWithFormat:@"variety like %s" ,[str UTF8String]]];
}
}
if([aEvent.eventWinery length]>0)
{
NSString *str = @"'%";
str = [str stringByAppendingString:aEvent.eventWinery];
str = [str stringByAppendingString:@"%'"];
if([aEvent.eventName length]>0 || [aEvent.eventWineName length]>0 || [aEvent.eventVariety length]>0)
{
conditionStr = [conditionStr stringByAppendingString:[NSString stringWithFormat:@" and (winery like %s)",[str UTF8String]]];
}
else
{
conditionStr = [conditionStr stringByAppendingString:[NSString stringWithFormat:@"winery like %s" ,[str UTF8String]]];
}
}
if(aEvent.eventRatings >0)
{
if([aEvent.eventName length]>0 || [aEvent.eventWineName length]>0 || [aEvent.eventWinery length]>0 || [aEvent.eventVariety length]>0)
{
conditionStr = [conditionStr stringByAppendingString:[NSString stringWithFormat:@" and ratings = %d",aEvent.eventRatings]];
}
else
{
conditionStr = [conditionStr stringByAppendingString:[NSString stringWithFormat:@" ratings = %d",aEvent.eventRatings]];
}
}
if(aEvent.eventDate >0)
{
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init];
[dateFormatter setDateFormat:@"dd-MMM-yy 23:59:59"];
NSString *dateStr = [dateFormatter stringFromDate:aEvent.eventDate];
NSDate *date = [dateFormatter dateFromString:dateStr];
[dateFormatter release];
NSTimeInterval interval = [date timeIntervalSinceReferenceDate];
printf("\n Interval in advance search:%f",interval);
if([aEvent.eventName length]>0 || [aEvent.eventWineName length]>0 || [aEvent.eventWinery length]>0 || aEvent.eventRatings>0 || [aEvent.eventVariety length]>0)
{
conditionStr = [conditionStr stringByAppendingString:[NSString stringWithFormat:@" and eventDate = %f",interval]];
}
else
{
conditionStr = [conditionStr stringByAppendingString:[NSString stringWithFormat:@" eventDate = %f",interval]];
}
}
NSString* queryString= @" select * from event";
queryString = [queryString stringByAppendingString:conditionStr];
sqlite3_stmt* statement;
sql = (char*)[queryString UTF8String];
if (sqlite3_prepare_v2(database, sql, -1, &statement, NULL) != SQLITE_OK)
{
NSAssert1(0, @"Error: failed to prepare statement with message '%s'.", sqlite3_errmsg(database));
}
sqlite3_bind_text(statement, 1, [aEvent.eventName UTF8String], -1, SQLITE_TRANSIENT);
sqlite3_bind_text(statement, 2, [aEvent.eventWineName UTF8String], -1, SQLITE_TRANSIENT);
sqlite3_bind_text(statement, 3, [aEvent.eventVariety UTF8String], -1, SQLITE_TRANSIENT);
sqlite3_bind_text(statement, 4, [aEvent.eventWinery UTF8String], -1, SQLITE_TRANSIENT);
sqlite3_bind_int(statement, 5,aEvent.eventRatings);
sqlite3_bind_double(statement,6, [[aEvent eventDate] timeIntervalSinceReferenceDate]);
while (sqlite3_step(statement) == SQLITE_ROW)
{
primaryKey = sqlite3_column_int(statement, 0);
searchEvent = [[EventsList alloc] initWithPrimaryKey:primaryKey database:database];
[searchList addObject:searchEvent];
[searchEvent release];
}
sqlite3_finalize(statement);
return searchList;
}
在这里，我比较了数据库和间隔值，我们正在寻找和Im得到不同的价值观和结果均未发现日期。
盖伊的帮助我摆脱这一点。
任何人的帮助将不胜感激。
谢谢 Monish Calapatapu。