テーブル一覧取得
-(NSArray*)getTableNameList{
    EGODatabase*db=[self getDB];
    NSString*sql=@"select name from sqlite_master where type = 'table' order by name";
    EGODatabaseResult*result=[db executeQuery:sql];
    NSMutableArray*list=[NSMutableArray arrayWithCapacity:[result count]];
    for (EGODatabaseRow*row in result) {
        [list addObject:[row stringForColumn:@"name"]];
    }
    return [NSArray arrayWithArray:list];
}
-(EGODatabase*)getDB{
    EGODatabase* database = [EGODatabase databaseWithPath:[NSHomeDirectory() stringByAppendingPathComponent:@"Documents/database.db"]];
    return database;
}
-(BOOL)isExistTableByName:(NSString*)tableName{
    NSArray*tables=[self getTableNameList];
    return [tables containsObject:tableName];
}