cachedrowset

Failed on insert row using CachedRowSet

由 对着背影说爱祢 提交于 2020-01-15 04:56:06
问题 I am using CachedRowSetImpl , I can get data from Database , BUT I can not insert . this is the Code : public class NewClass { static final String DATABASE_URL = "jdbc:derby://localhost:1527/TaskDB;create=true"; static final String USERNAME = "user"; static final String PASSWORD = "user"; public static void main (String [] agr) throws SQLException { CachedRowSetImpl rs = new CachedRowSetImpl(); rs.setUrl(DATABASE_URL); rs.setUsername(USERNAME); rs.setPassword(PASSWORD); rs.setCommand("SELECT

Are there any good CachedRowSet implementations other than the proprietary Sun one?

由 空扰寡人 提交于 2020-01-10 12:48:55
问题 I am investigating using javax.sql.rowset.CachedRowSet in part of my application, however I can only find information on using the proprietary sun implementation com.sun.rowset.CachedRowSetImpl or Oracle specific implementations. The sun implementation is unsupported and subject to change. Using this could also cause problems if I want to deploy to non-Sun virtual machines in the future, and finally it leaves unsuppressible warnings in our build logs which can mask other warnings. Is there an

CachedRowSet failed to insert row

由 寵の児 提交于 2019-12-24 08:31:03
问题 I'm using CachedRowSet . But when I call the insertRow() method, there is a SQLException failed to insert row. Here is my code: static final String DATABASE_URL = "jdbc:mysql://localhost:3306/javapos"; static final String USERNAME = "root"; static final String PASSWORD = "sbc"; public static void main (String [] agr) throws SQLException { CachedRowSetImpl rs = new CachedRowSetImpl(); rs.setUrl(DATABASE_URL); rs.setUsername(USERNAME); rs.setPassword(PASSWORD); rs.setCommand("select * from uom

CachedRowSet: can it still be used to hold ResultSet data?

由 痴心易碎 提交于 2019-12-23 08:28:18
问题 I would like to write a java function that takes in a SQL query and returns a ResultSet for processing elsewhere. This can't be done as a ResultSet is dead once the connection is closed. Googling around I found a VERY OLD (2004) OReilly article that had something that looked like the cure: CachedRowSet. You just drop in your ResultSet, the CachedRowSet saves the data, lets you close the connection and play with the data elsewhere using the returned CachedRowSet. The article references

Implementations of RowSet, CachedRowSet etc

由 a 夏天 提交于 2019-12-17 18:33:19
问题 Until today I was working with ResultSet when handling results from queries. But today I read a little about RowSet and CachedRowset and I realized they can serve my purposes better. While in all the examples I read where RowSet and CachedRowSet were referred to as object, when I tried it myself in my code I realized those are interfaces and in the examples they use some implementation of those interfaces. Now my question is where do I find those implementations, and is there something

CachedRowSet slower than ResultSet?

由 浪子不回头ぞ 提交于 2019-12-10 10:18:20
问题 In my java code, I access an oracle database table with an select statement. I receive a lot of rows (about 50.000 rows), so the rs.next() needs some time to process all of the rows. using ResultSet, the processing of all rows (rs.next) takes about 30 secs My goal is to speed up this process, so I changed the code and now using a CachedRowSet : using CachedRowSet, the processing of all rows takes about 35 secs I don't understand why the CachedRowSet is slower than the normal ResultSet ,

Caused by: java.lang.ClassCastException: java.sql.Timestamp cannot be cast to java.sql.Date

由 好久不见. 提交于 2019-12-07 17:47:20
问题 I am getting the below given error for the following code snippets: try { cRows = new CachedRowSetImpl(); while(cRows.next()) { MyClass myClass = new MyClass(); myClass.setPrevDate(cRows.getDate("PREV_DATE")); // In debug mode, the error was throwing when I press Resume from here. } } Error: Caused by: java.lang.ClassCastException: java.sql.Timestamp cannot be cast to java.sql.Date In the database, the datatype for the column is DATE only. I am not able to figure out where the Timestamp is

CachedRowSet slower than ResultSet?

由 落爺英雄遲暮 提交于 2019-12-05 22:46:39
In my java code, I access an oracle database table with an select statement. I receive a lot of rows (about 50.000 rows), so the rs.next() needs some time to process all of the rows. using ResultSet, the processing of all rows (rs.next) takes about 30 secs My goal is to speed up this process, so I changed the code and now using a CachedRowSet : using CachedRowSet, the processing of all rows takes about 35 secs I don't understand why the CachedRowSet is slower than the normal ResultSet , because the CachedRowSet retrieves all data at once, while the ResultSet retrieves the data every time the

How do I check to see if a column name exists in a CachedRowSet?

由 删除回忆录丶 提交于 2019-12-01 15:56:03
I am querying data from views that are subject to change. I need to know if the column exists before I do a crs.get******() .I have found that I can query the metadata like this to see if a column exist before I request the data from it. ResultSetMetaData meta = crs.getMetaData(); int numCol = meta.getColumnCount(); for (int i = 1; i < numCol+1; i++) if(meta.getColumnName(i).equals("name")) return true; Is there a simpler way of checking to see if a column exists? EDIT: It must be database agnostic. That is why I am referencing the CachedRowSet instead of the database. There's not a simpler

How do I check to see if a column name exists in a CachedRowSet?

由 ≯℡__Kan透↙ 提交于 2019-12-01 14:55:51
问题 I am querying data from views that are subject to change. I need to know if the column exists before I do a crs.get******() .I have found that I can query the metadata like this to see if a column exist before I request the data from it. ResultSetMetaData meta = crs.getMetaData(); int numCol = meta.getColumnCount(); for (int i = 1; i < numCol+1; i++) if(meta.getColumnName(i).equals("name")) return true; Is there a simpler way of checking to see if a column exists? EDIT: It must be database
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