WEKA & MySQL Setup a connection

问题:

WEKA Explorer can't open a connection to MySQL.

connecting to: jdbc:mysql://MYSERVER:3306/NAME = true

by the way: mysql driver was downloaded mysql-connector-java-5.1.14-bin & classpath was set.

(User & Pass are ok because it works with MySQL Workbench)

when clicking on the JButton OK (in the form 'Open DB'), then a message box shows an error - see image:

(screen shot shows infamous "no driver" error)

weka version is 3.6.3.

any suggestions ?

回答1:

Wasted half an hour on this same problem, here's the answer:

Download the connector from http://dev.mysql.com/downloads/connector/j/

Extract the JAR file.

Edit C:\Program Files\Weka-3-6\RunWeka.ini

Change last line to:

cp=%CLASSPATH%;c:/mysql-connector-java-5.1.16-bin.jar

You may of course save your mysql-connector jar to a different path, but mind the forward slash, nevermind being on Windows.

回答2:

I solved this problem along the day. The solution took me hours. If you are in ubuntu or debian-based linux, first install mysql-connector-java with:

sudo apt install libmysql-java

It will install mysql-connector-java-* links in /usr/share/java/mysql-connector-java.jar

#!/bin/bash
# Path to weka.jar
CP=$CLASSPATH:/usr/share/java/:/usr/share/java/weka.jar:/usr/share/java/mysql-connector-java.jar
# start Explorer
java -cp $CP -Xmx500m weka.gui.GUIChooser

I replaced /usr/bin/weka with the script above. Maybe could save hours for people like me. Another option is edit your desktop menu with:

java -cp "/usr/share/java/mysql.jar:/usr/share/java/weka.jar" -Xmx500m weka.gui.GUIChooser

(in my case mysql.jar links the correct version of the driver)

回答3:

After you're done with CLASSPATH variable, You might need to create a "DatabaseUtlils.props" file and add following line in it,

jdbcDriver=com.mysql.jdbc.Driver

and import it in Weka under "switch database setup"

Cheers!

回答4:

Actually and can extract the source jar and import into eclipse maven and add the Mysql dependency in the pom.xml , than run maven build with parameters "clean install" , once it is finished you will have alot of errors you can ignore them those are JUnit testing and than run project as a Java Application and use the GUI class "weka.gui.GUIChooser" add the connection string and smooth sailing.

pom.xml add:

<dependency>
  <groupId>mysql</groupId>
  <artifactId>mysql-connector-java</artifactId>
  <version>5.1.36</version>
</dependency>

After maven install in complete. ![enter image description here][5] Click the explorer and Add your connection string , username and password jdbc:mysql://ip:port/databasename ![enter image description