fix: use SQLWarning(String reason) constructor for correct DriverMana… (

#751)

* fix: use SQLWarning(String reason) constructor for correct DriverManager logging

Previously, the default constructor was used which only logs "SQLWarning: ", but no information about the warning.

pgjdbc/src/main/java/org/postgresql/util/PSQLWarning.java

@@ -13,17 +13,10 @@
  private ServerErrorMessage serverError;

  public PSQLWarning(ServerErrorMessage err) {
    super(err.toString(), err.getSQLState());
    this.serverError = err;
  }

  public String toString() {
    return serverError.toString();
  }

  public String getSQLState() {
    return serverError.getSQLState();
  }

  public String getMessage() {
    return serverError.getMessage();
  }

pgjdbc/src/test/java/org/postgresql/util/PSQLWarningTest.java

@@ -0,0 +1,37 @@
/*
 * Copyright (c) 2016, PostgreSQL Global Development Group
 * See the LICENSE file in the project root for more information.
 */

package org.postgresql.util;

import static org.junit.Assert.assertTrue;

import org.postgresql.test.TestUtil;

import org.junit.Test;

import java.io.ByteArrayOutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;


public class PSQLWarningTest {

  @Test
  public void testPSQLLogsToDriverManagerMessage() throws Exception {
    Connection con = TestUtil.openDB();
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    DriverManager.setLogWriter(new PrintWriter(new OutputStreamWriter(baos, "ASCII")));

    Statement stmt = con.createStatement();
    stmt.execute("DO language plpgsql $$ BEGIN RAISE NOTICE 'test notice'; END $$;");
    assertTrue(baos.toString().contains("NOTICE: test notice"));

    stmt.close();
    con.close();
  }
}