I am developing android application. In my application i have used sql server2008 R2. I am inserting the row in the sql server on some click event. Now i want to fetch the first column's value from the newly inserted row. The first column's value of that schema is auto generated.I am inserting the value from the second column in my insert query. I am using jdbc. In .net to achieve this functionality method ExecuteScalar() is der. But what in java. I have done lots of googling but haven't found any thing. Help me if you the solution.
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How to get the insert ID in JDBC?
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I am currently trying to push some data from Java into BigQuery, in order to be able to make use of it only for the next query and then to get rid of it.
The data consists of 3 columns which exists in the table I want to query. Therefore, by creating a temporary table containing this data, I could make a left join and get the query results I am in need of.
This process will happen on a scheduled basis, having different sets of data.
Can you please tell me if that can be done ?
Many thanks !
Using the jobs.query API, you can specify a destinationTable as part of configuration.query. Does that help? You can control the table expiration time using the tables.update API and setting expirationTime.
Alternatively, you can "inline" the table as part of the query that you want to run using a WITH clause in standard SQL rather than writing to a temporary table.
Is there any way to know whether a Database column is updated in Postgresql when calling update function in Java in Eclipse? I tried using trigger, but it will only give the number of rows updated. I need to know which column is updated.
I could get notifications from an Oracle database thanks to this code and omitting this line:
prop.setProperty(OracleConnection.DCN_QUERY_CHANGE_NOTIFICATION,"true");
Also I could solve my ORA-29977 problem changing select * from act_code_metadata where product_id=1159 with select column_with_Number_type from act_code_metadata where product_id=1159
Everything works as expected :D
This is the code I use to print the row's information (Java 8):
DatabaseChangeRegistration dcp.addListener((DatabaseChangeEvent dce) ->
System.out.println(
"Changed row id : " +
dce.getTableChangeDescription()[0].getRowChangeDescription()[0].getRowid().stringValue()
+ " " + dce.getTableChangeDescription()[0].getRowChangeDescription()[0].getRowOperation().toString()));
But all the information I get is the row's physical address (rowid) and the operation involved (insert, delete or update).
I need to identify the row being modified/inserted/deleted to refresh my cached data in several Swing controls in my GUI.
I've read that, despite the rowid being imutable, the same rowid can be re-assigned if the row is deleted and a new one is inserted, and the rowid can change if the row is in a partitioned table. So the best that can be done is using the rowid and the row's primary key.
My table has a autoincrementable primary key (with a sequence and a trigger) created with this code.
I have no control on what happens on the database or if somebody inserts and deletes rows several times. So I can get the wrong row when selecting it using the rowid given by the notification.
Is there a way that I can get my row's primary key via Oracle Database Change Notification so I can identify the inserted/deleted/modified row correctly?
I'm working with Oracle Database XE 11.2 Express and Java 8. The user for database connection already has the change notification privilege.
It seems that you have a lot of overhead trying to basically maintain a fresh snapshot of the data in your GUI. It may be simpler to look at client result caching and just re-running your query every X seconds; and let Oracle do the magic of seeing if the data changed. You would be limited to a JDBC driver that supports OCI. See http://docs.oracle.com/cd/E11882_01/server.112/e41573/memory.htm#PFGRF985 for details. With client result caching, the first time the SQL is executed, it will take say 500 milliseconds. Next query using the same criteria it will take 2 or 3 milliseconds. Assuming the result set is small (less than 100 rows is quite small), you can get a lot better results without all that framework you are trying to build.
I am using the embedded h2 database inside of the play framework. I am trying to insert some test data into it, then retrieve that data.
as you can see, the right side shows me that there is indeed a suscribers table, but when being run, I get this:
What am I doing wrong?
Try with dbName.tblName, for example:
insert into dbName.tblName ...
and also:
You are inserting 2 columns out of 3 columns per table. I think you have to mention column names as well.
I am learning Java and have big problem with SQL query. I have field that should be updated if exist or inserted if not exist.
Firstly I tried with IF NOT EXISTS, but it turns out that Oracle doesn't support that.
Then I tried with EXCEPTION WHEN NO_DATA_FOUND, but it also failed.
After few hours of searching I found out that MERGE must work on my example, but for some reason I couldn't make it to work. I have never used merge before, so maybe I made mistake in query, but I don’t think that’s the problem.
So, I have table commercial and field in it idArt, idPla, quan and ID (unique and auto increment). From html form I am sending first three values to servlet and then servlet should do next thing:
if there is row with idArt=(formIdArt) AND idPla=(formIdPla) then update quan=quan+(formQuan), ELSE insert all three values.
This looks simple, but I have already lost way too much time on this, so can please someone help me with this?
First,
Try to update your table like this:
update commercial set quan = quan + formquan where idArt=formIdArt and idPla = formIdPla
if execution of this query returns result as more than 0 row affected then do not insert all three values, else insert all three values in your table