Connecting to a Database (Using UDS)

The Unix domain socket is used for data exchange between different processes on the same host. You can add junixsocket to obtain the socket factory.

The junixsocket-core-XXX.jar, junixsocket-common-XXX.jar, and junixsocket-native-common-XXX.jar JAR packages need to be referenced. In addition, you need to add socketFactory=org.newsclub.net.unix.AFUNIXSocketFactory$FactoryArg&socketFactoryArg= [path-to-the-unix-socket] to the URL connection string.

Example:

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;
import java.util.Properties;

public class Test {
    public static void main(String[] args) {
        String driver = "org.postgresql.Driver";
        Connection conn;
        try {
            Class.forName(driver).newInstance();
            Properties properties = new Properties();
            properties.setProperty("user", "username");
            properties.setProperty("password", "password");
            conn = DriverManager.getConnection("jdbc:postgresql://localhost:8000/postgres?socketFactory=org.newsclub" +
                            ".net.unix" +
                            ".AFUNIXSocketFactory$FactoryArg&socketFactoryArg=/data/tmp/.s.PGSQL.8000",
                    properties);
            System.out.println("Connection Successful!");
            Statement statement = conn.createStatement();
            statement.executeQuery("select 1");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

• Set the socketFactoryArg parameter based on the actual path. The value must be the same as that of the GUC parameter unix_socket_directory.
• The connection host name must be set to localhost.