I am retrieving the data from OracleDB using occi in my application.
While retrieving it, I found that the digits after decimal points were not properly retrieved.
For example, in the DB the original value was 12345.12 but while retrieving from resultset the value i got was 12345.1.
I need to retrieve the whole value (preferably double helps me a lot for my application mapping purpose). Any suggestions will help me a lot.
column in the Oracle DB is NUMBER(11,2) datatype.
I tried to retrieve from result set in the following ways but still got the same truncated value in it.
resultSet -> getDouble(1);
Number nr = resultSet -> getNumber(1);
double d = nr.operator double();
I have tried resultSet->getString(1) and able to get the whole value. Yes i need to cast it to double but getting the data is important than casting. So i will go for it. If anyone has any better solution post it and I am ready to take it.
Related
I build a dynamic Dictionary in ClickHouse DB. It will create the dictionary before the SQL commands execute. Also, the dictionary name was created at the same time.
The dictionary name was a combined string by date and table name. Because I don't want to keep so much data in the long-term dictionary, the short-term Dictionary could be a great help to release the memory after maybe an hour when no one is using it.
And the error happened.
When I use the dictionary in my SQL commands it is okay with solid commands.
e.g.
dictGet(CONCAT('2022-04-06', 'MyTableName'), 'GetBackColumnName',myKeyColumn) AS col_name
But when I change to using the column from Table, it was broken.
e.g.
dictGet(CONCAT(DATE_COL, 'MyTableName'), 'GetBackColumnName',myKeyColumn) AS col_name
And the error message shows up.
Illegal type String of the first argument of function dictGet,
expected a const string.
Does anyone know how to fix the issue?
My CH version is: 20.8.7.15
I try to find the resolution from the ClickHouse office report but nothing can fix this issue. And I tried lots of functions of String to figure out what happened.
We use VBA to retrieve data from an Oracle database using the Microsoft.ACE.OLEDB.12.0 provider.
We have used this method without issue for a long time, but we have encountered a problem with a specific query of data from a specific table.
When running it under VBA, we get "Run-Time error '1004': Application-defined or object-defined error. However investigating further, we find the following:
The queries we run are dynamically generated, and how we handle them is to read the results into a variant array, then output that array into Excel. When we step-through our particular query, we find that one specific database field is "blank": The locals window shows the value to be completely blank: it is not an empty string, it is not a null, it is not zero. VarType() shows it to be a decimal data type, and yet it is empty.
I can't seem to prevent this error from locking-out:
On Error Resume Next
...still breaks.
if (isEmpty(theValue)) then
...doesn't catch it, because it is not empty
if (theValue is nothing) then
...doesn't catch it because it is not an object
etc.
We used the SQL in the a .NET application, and got a more informative error:
Decimal's scale value must be between 0 and 28, inclusive. Parameter name: Scale
So: I see this as two issues:
1.) In VBA, how do I trap the variant datatype value-that-is-not-empty-or-null, and;
2.) How do I resolve the Oracle Decimal problem?
For #2, I see from the Oracle decimal data type, it can support precision of up to 31 places, and I assume that the provider I am using can only support 28. I guess I need to Cast it to a smaller type in the query.
Any other thoughts?
I have a little problem with Enterprise Architect by Sparx System.
Im trying to model database schema for Oracle. I created table with primary key with data type long. But when im trying to modify column properties (set AutoNum = true) I see empty properties. I read documentation of EA and saw that I need to setup this property to generate sequence syntax.
When I change data type to number, or switch database to mysql (for example) everything is alright, there are properties so Im able to modify AutoNum value.
Did you had similar problem and found solution ? or maybe im doing something wrong.
regards
It's becouse Oracle use sequence instead of autoincrement option. I've checked it and I think you have to use NUMBER column type and then set AutoNum property (you have to select Generate Sequences in options to get proper DDL code too). Instead of LONG data type you can set PRECISION and SCALE options on NUMBER type ie NUMBER(8) mean you can have 8 digits number and it can be set up to 38, so if you don't want to store info about every star in the universe will be enought for your scenario :)
So I'm extremely new to Linq in .Net 3.5 and have a question. I use to use a custom class that would handle the following results from a store procedure:
Set 1: ID Name Age
Set 2: ID Address City
Set 3: ID Product Price
With my custom class, I would have received back from the database a single DataSet with 3 DataTables inside of it with columns based on what was returned from the DB.
My question is how to I achive this with LINQ? I'm going to need to hit the database 1 time and return multiple sets with different types of data in it.
Also, how would I use LINQ to return a dynamic amount of sets depending on the parameters (could get 1 set back, could get N amount back)?
I've looked at this article, but didn't find anything explaining multiple sets (just a single set that could be dynamic or a single scalar value and a single set).
Any articles/comments will help.
Thanks
I believe this is what you're looking for
Linq to SQL Stored Procedures with Multiple Results - IMultipleResults
I'm not very familiar with LINQ myself but here is MSDN's site on LINQ Samples that might be able to help you out.
EDIT: I apologize, I somehow missed the title where you mentioned you wanted help using LINQ with Stored Procedures, my below answer does not address that at all and unfortunately I haven't had the need to use sprocs with LINQ so I'm unsure if my below answer will help.
LINQ to SQL is able hydrate multiple sets of data into a object graph while hitting the database once. However, I don't think LINQ is going to achieve what you ultimately want -- which as far as I can tell is a completely dynamic set of data that is defined outside of the query itself. Perhaps I am misunderstanding the question, maybe it would help if you provide some sample code that your existing application is using?
Here is a quick example of how I could hydrate a anonymous type with a single database call, maybe it will help:
var query = from p in db.Products
select new
{
Product = p,
NumberOfOrders = p.Orders.Count(),
LastOrderDate = p.Orders.OrderByDescending().Take(1).Select(o => o.OrderDate),
Orders = p.Orders
};
I currently have an existing database and I am using the LINQtoSQL generator tool to create the classes for me. The tool is working fine for this database and there are no errors with that tool.
When I run a LINQ to SQL query against the data, there is a row that has some invalid data somehow within the table and it is throwing a System.FormatException when it runs across this row. Does anyone know what that stems from? Does anyone know how I can narrow down the effecting column without adding them one by one to the select clause?
Do you have a varchar(1) that stores an empty string?
You need to change the type from char to string in the designer (or somehow prohibit empties). The .net char type cannot hold an empty string.