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MySQL Java-connector on Windows?

+3 votes
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I have MySQL 5.5.8 under Windows Vista, and I am minded to write Java programs to talk to the server. I believe that a connector is needed for that, something with ODBC in the name--which version is best for my use?

posted Dec 11, 2013 by Majula Joshi

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1 Answer

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answer Dec 11, 2013 by Luv Kumar
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+2 votes

I try to run www.icescrum.org on my Tomcat 7 on Ubuntu 12.04 with OpenJDK.

I have installed Tomcat with apt-get and also I have installed the libmysql-java package. On starting Tomcat it reports on a stacktrace log, that the mySQL connector is not found (java.lang.ClassNotFoundException: "com.mysql.jdbc.Driver").

So I have try to create a symlink in Tomcats lib dir to the jar file and try to modify the properties of the search paths:

common.loader=${catalina.base}/lib,${catalina.base}/lib/*.jar,${catalina.home}/lib,
${catalina.home}/lib/*.jar,/var/lib/tomcat7/common/classes,/var/lib/tomcat7/common/*.jar
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shared.loader=/var/lib/tomcat7/shared/classes,/var/lib/tomcat7/shared/*.jar

The JDBC mySQL Jar is stored under /usr/share/java with two symlinks, I have tried to create a symlink from Tomcats lib dir (/usr/share/tomcat7/lib) to ../../java/mysql.jar but the mySQL is also not loaded. The CATALINA_HOME is set to /usr/share/tomcat7 and the CATALINA_BASE is /var/lib/tomcat7, so imho it should be worked.

How can I create a working IceScrum with mySQL and a shared mySQL connector?

+1 vote

We have the following mysql timetampe field

startdate | timestamp | NO | | 0000-00-00 00:00:00

When trying to insert a long value in there:

Calendar c = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
c.getTimeInMillis();

We are presented with the following error:

com.mysql.jdbc.MysqlDataTruncation: Data truncation: Incorrect datetime value: '1377119243640' for column 'stopdate' at row 1

Our environments is:

JDBC Driver = 5.1.26
Mysql = 5.5

show variables like 'time_zone%';
+---------------+--------+
| Variable_name | Value |
+---------------+--------+
| time_zone | +00:00 |
+---------------+--------+

SELECT @@global.sql_mode;
+-------------------+
| @@global.sql_mode |
+-------------------+
| |
+-------------------+
+2 votes

In my web application I need to encrypt the database password and and that should be stored in the properties file?

+1 vote

I have a table in Mysql DB like following

mysql> describe APPTBL;
+-------------+-------------+------+-----+---------+----------------+
| Field       | Type        | Null | Key | Default | Extra          |
+-------------+-------------+------+-----+---------+----------------+
| APP_ID      | int(11)     | NO   | PRI | NULL    | auto_increment |
| CREATE_DATE | date        | YES  |     | NULL    |                |
| CLOSE_DATE  | date        | YES  |     | NULL    |                |
| ACTION      | text        | YES  |     | NULL    |                |
+-------------+-------------+------+-----+---------+----------------+

While Starting of App, i am inserting the app details with CREATE_DATE and when it is closing, i am updating its CLOSE_DATE. But in case if user is restarting the app, i want to update NULL in place of CLOSE_DATE column. Here is my query,

mysql> update APPTBL set CLOSE_DATE = NULL where APP_ID = 1;
Query OK, 0 rows affected (0.00 sec)
Rows matched: 1  Changed: 0  Warnings: 0
mysql> select * from APPTBL ;
+-----------+-------------+------------+------------+
|   APP_ID  | CREATE_DATE | CLOSE_DATE |   ACTION   |
+-----------+-------------+------------+------------+
|    1      |  2013-10-08 | NULL       | XXXXXYYYYY |
+-----------+-------------+------------+------------+
1 row in set (0.00 sec)

But why i am not getting any result in this??

mysql> select * from APPTBL where CLOSE_DATE = NULL;
Empty set (0.00 sec)

Also, as i am writhing a java program using this where

rs = st.executeQuery("update APPTBL set CLOSE_DATE = NULL where APP_ID = 1");
if(!rs.wasNull()){
   // Why it is coming here??
}
+1 vote

In my web application I have a requirement database password should be stored in properties fie and that should be encrypted and during login that it needs to check the username password and database password database password should be decrypt during login and and encrypt during log out.

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