#Eclipse for mac jdbc sql code#

3) Add the below code in VM arguments: 'C:\sqlauth'. To connect to the PostgreSQL database server from a Java program, you need to have PostgreSQL JDBC driver.

2) Choose the ' Arguments ' tab for your class.

Disable firewall and/or configure firewall/proxy to allow/forward the port. Here are the steps if you want to do this from Eclipse : 1) Create a folder 'sqlauth' in your C: drive, and copy the dll file sqljdbcauth.dll to the folder.

Restart the DB and fix your code accordingly that it closes connections in finally.

Verify if mysqld is started without the -skip-networking option.

Refresh DNS or use IP address in JDBC URL instead.

To solve the one or the other, follow the following advices:

Something in between Java and DB is blocking connections, e.g.

DB server doesn't accept TCP/IP connections.

Port number is missing or wrong in JDBC URL. MySQL with Java in Eclipse fig -8 Adding MySQL connector jar file in Eclipse.

Hostname in JDBC URL is not recognized by local DNS server.

IP address or hostname in JDBC URL is wrong.

This can have one or more of the following causes: If you get an SQLException: Connection refused or Connection timed out or a MySQL specific CommunicationsException: Communications link failure, then it means that the DB isn't reachable at all. I'm quoting from this answer which also contains a step-by-step MySQL+JDBC tutorial: newInstance0 ( Native Method ).Ĭom.4.CommunicationsException: Communications link failure CommunicationsException : Communications link failureĪt sun. createCommunicationsException ( SQLError. newInstance ( DelegatingConstructorAccessorImpl. Specify a Driver Template and Definition Name as per your chosen. The PL/SQL Connector Builder generates Java access code to call the stored procedures directly by JDBC. I have chosen Microsoft SQL Server as shown below: 3) Specify the JDBC Driver details. 2) Create Connection Profile and chose the database you want to connect. newInstance ( NativeConstructorAccessorImpl. 1) Open Eclipse IDE and Select Database Perspective (Windows > Open Perspective > Other > Database Development). The driver has not received any packets from the server. The last packet sent successfully to the server was 0 milliseconds ago. CommunicationsException : Communications link failure I'm getting a rather stupendous error: Exception in thread 'main' com. I'm working on getting my database to talk to my Java programs.Ĭan someone give me a quick and dirty sample program using the JDBC?Ĭontents of the test file: import com.