Add POSTGRES_SUPPORTED_DOC_URL

Author: psainics

database-commons/src/main/java/io/cdap/plugin/util/DBUtils.java

@@ -61,6 +61,8 @@ public final class DBUtils {
 
   public static final Calendar PURE_GREGORIAN_CALENDAR = createPureGregorianCalender();
   public static final String MYSQL_SUPPORTED_DOC_URL = "https://dev.mysql.com/doc/mysql-errors/9.0/en/";
+  public static final String POSTGRES_SUPPORTED_DOC_URL =
+    "https://www.postgresql.org/docs/current/errcodes-appendix.html";
 
   // Java by default uses October 15, 1582 as a Gregorian cut over date.
   // Any timestamp created with time less than this cut over date is treated as Julian date.

postgresql-plugin/src/main/java/io/cdap/plugin/postgres/PostgresErrorDetailsProvider.java

@@ -19,6 +19,7 @@
 import io.cdap.cdap.api.exception.ErrorCategory;
 import io.cdap.cdap.api.exception.ErrorType;
 import io.cdap.plugin.db.DBErrorDetailsProvider;
+import io.cdap.plugin.util.DBUtils;
 
 import java.util.HashMap;
 import java.util.Map;
@@ -71,7 +72,7 @@ public class PostgresErrorDetailsProvider extends DBErrorDetailsProvider {
 
   @Override
   protected String getExternalDocumentationLink() {
-    return "https://www.postgresql.org/docs/current/errcodes-appendix.html";
+    return DBUtils.POSTGRES_SUPPORTED_DOC_URL;
   }
 
   @Override