Technical Reference Manual - InduSoft

Database Interface
1. Follow the Troubleshooting steps, and look for error messages in the log. An error message can tell you
if you have made a mistake, such as entering with a wrong column name or specifying an invalid data
format.
2. Some databases have problems when you use reserved words as column names. Therefore, you should
avoid using column names such as Time, Date, Numeric, etc.
3. If your column name starts with AND or OR (e.g., ORange), enter the name surrounded by square
brackets. For example, instead of ORange=10, enter [ORange]=10.
4. If you are using SQL Server CE, you might have some problems when querying string fields. It has been
identified that filters do not work with NCHAR data types; however, they do work if you declare these fields
as NVARCHAR(). You might try to recreate your table by using this data type. An example of a
command that creates a table with strings that can be queried is displayed below:
CREATE TABLE Table1 (Name NVARCHAR(128), Age Numeric, Sex NVARCHAR(1))
ORACLE
Q: When I lose the connection with an ORACLE database, it does not recover. I receive the following message
in the logwin: Database: Error: ORA-03114: not connected to ORACLE. Is that a problem with the IWS
Database Interface
A: The Oracle .Net Provider has a problem managing the connection pool. You need to install a QFE 830173.
At the time that this document was written, more information about this problem could be found at this site
(external link).
Q: When I try to access the database, I get the following error message: ORA-00162: external dbid length
19 is greater than maximum (16). What should I do
A: At the time that this document was written, there was a problem on the Oracle .NET Provider; the Server
Name (SERVER/TNS) could not exceed 16 characters. In order to fix this problem, you should try to reduce
your Server Name field. One way of doing this is to edit the file \WINDOWS\system32\drivers\etc\hosts to
add an entry with a smaller server name. For instance, the server name specified by 192.168.89.98, has 13
characters, it could be reduced to 3 by adding the following line in the file:
192.168.89.98 ora
Now you can configure the Server Name configuration using ORA/TNS instead of 192.168.89.98/TNS.
MYSQL
Q: When I try to access the database from my local machine it works fine, but when I move my project to a
remote machine, it says Access Denied.
A: Each user on a MySQL database has a property associated with it that indicates the computer fromwhich
it can get access to the database. By default, this property is set to localhost, so you will only be able to
access the database if you are accessing from the local computer. You should read the MySQL manual for
information about changing this setting.
Q: Sometimes when I try to synchronize a remote MySQL database with a local MySQL database, or if I try to
use application redundancy, a connection to the ADO.NET interface is opened and never closed.
A: Go to the Database Configuration dialog and uncheck the Automatically Create option.
SYBASE
Q: I configured my Sybase database using the Browse button. When I click the test button, the test
succeeds, but when I try to run my project I get the following error: Database: Error: Parse error: DSN
'MyDatabase' does not exist. What am I doing wrong
A: Please refer to Database Appendix F - Using Sybase for more information about this problem.
Q: Why, when I try to connect to the Sybase database, am I receiving the error Error to create
connection class [iAnywhere.Data.AsaClient.AsaConnection]
A: You do not have the ADO.NET Provider installed on your computer. The database setup program has an
option to install the Provider. Rerun the setup program, and make sure to check that option.
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