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ExceptionTests.cs
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#region License
// The PostgreSQL License
//
// Copyright (C) 2018 The Npgsql Development Team
//
// Permission to use, copy, modify, and distribute this software and its
// documentation for any purpose, without fee, and without a written
// agreement is hereby granted, provided that the above copyright notice
// and this paragraph and the following two paragraphs appear in all copies.
//
// IN NO EVENT SHALL THE NPGSQL DEVELOPMENT TEAM BE LIABLE TO ANY PARTY
// FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES,
// INCLUDING LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS
// DOCUMENTATION, EVEN IF THE NPGSQL DEVELOPMENT TEAM HAS BEEN ADVISED OF
// THE POSSIBILITY OF SUCH DAMAGE.
//
// THE NPGSQL DEVELOPMENT TEAM SPECIFICALLY DISCLAIMS ANY WARRANTIES,
// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
// AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
// ON AN "AS IS" BASIS, AND THE NPGSQL DEVELOPMENT TEAM HAS NO OBLIGATIONS
// TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
#endregion
using System;
using System.Data;
using System.IO;
using System.Net.Sockets;
using NUnit.Framework;
using System.Runtime.Serialization.Formatters.Binary;
namespace Npgsql.Tests
{
public class ExceptionTests : TestBase
{
[Test, Description("Generates a basic server-side exception, checks that it's properly raised and populated")]
public void Basic()
{
using (var conn = OpenConnection())
{
// Make sure messages are in English
conn.ExecuteNonQuery(@"SET lc_messages='en_US.UTF8'");
conn.ExecuteNonQuery(@"
CREATE OR REPLACE FUNCTION pg_temp.emit_exception() RETURNS VOID AS
'BEGIN RAISE EXCEPTION ''testexception'' USING ERRCODE = ''12345''; END;'
LANGUAGE 'plpgsql';
");
PostgresException ex = null;
try
{
conn.ExecuteNonQuery("SELECT pg_temp.emit_exception()");
Assert.Fail("No exception was thrown");
}
catch (PostgresException e)
{
ex = e;
}
Assert.That(ex.MessageText, Is.EqualTo("testexception"));
Assert.That(ex.Severity, Is.EqualTo("ERROR"));
Assert.That(ex.SqlState, Is.EqualTo("12345"));
Assert.That(ex.Position, Is.EqualTo(0));
var data = ex.Data;
Assert.That(data[nameof(PostgresException.Severity)], Is.EqualTo("ERROR"));
Assert.That(data[nameof(PostgresException.SqlState)], Is.EqualTo("12345"));
Assert.That(data.Contains(nameof(PostgresException.Position)), Is.False);
Assert.That(conn.ExecuteScalar("SELECT 1"), Is.EqualTo(1), "Connection in bad state after an exception");
}
}
[Test]
public void ExceptionFieldsArePopulated()
{
using (var conn = OpenConnection())
{
TestUtil.MinimumPgVersion(conn, "9.3.0", "5 error fields haven't been added yet");
conn.ExecuteNonQuery("CREATE TEMP TABLE uniqueviolation (id INT NOT NULL, CONSTRAINT uniqueviolation_pkey PRIMARY KEY (id))");
conn.ExecuteNonQuery("INSERT INTO uniqueviolation (id) VALUES(1)");
try
{
conn.ExecuteNonQuery("INSERT INTO uniqueviolation (id) VALUES(1)");
}
catch (PostgresException ex)
{
Assert.That(ex.ColumnName, Is.Null, "ColumnName should not be populated for unique violations");
Assert.That(ex.TableName, Is.EqualTo("uniqueviolation"));
Assert.That(ex.SchemaName, Does.StartWith("pg_temp"));
Assert.That(ex.ConstraintName, Is.EqualTo("uniqueviolation_pkey"));
Assert.That(ex.DataTypeName, Is.Null, "DataTypeName should not be populated for unique violations");
}
}
}
[Test]
public void ColumnNameExceptionFieldIsPopulated()
{
using (var conn = OpenConnection())
{
TestUtil.MinimumPgVersion(conn, "9.3.0", "5 error fields haven't been added yet");
conn.ExecuteNonQuery("CREATE TEMP TABLE notnullviolation (id INT NOT NULL)");
try
{
conn.ExecuteNonQuery("INSERT INTO notnullviolation (id) VALUES(NULL)");
}
catch (PostgresException ex)
{
Assert.That(ex.SchemaName, Does.StartWith("pg_temp"));
Assert.That(ex.TableName, Is.EqualTo("notnullviolation"));
Assert.That(ex.ColumnName, Is.EqualTo("id"));
}
}
}
[Test]
[NonParallelizable]
public void DataTypeNameExceptionFieldIsPopulated()
{
// On reading the source code for PostgreSQL9.3beta1, the only time that the
// datatypename field is populated is when using domain types. So here we'll
// create a domain that simply does not allow NULLs then try and cast NULL
// to it.
const string dropDomain = @"DROP DOMAIN IF EXISTS public.intnotnull";
const string createDomain = @"CREATE DOMAIN public.intnotnull AS INT NOT NULL";
const string castStatement = @"SELECT CAST(NULL AS public.intnotnull)";
using (var conn = OpenConnection())
{
TestUtil.MinimumPgVersion(conn, "9.3.0", "5 error fields haven't been added yet");
try
{
var command = new NpgsqlCommand(dropDomain, conn);
command.ExecuteNonQuery();
command = new NpgsqlCommand(createDomain, conn);
command.ExecuteNonQuery();
command = new NpgsqlCommand(castStatement, conn);
//Cause the NOT NULL violation
command.ExecuteNonQuery();
}
catch (PostgresException ex)
{
Assert.AreEqual("public", ex.SchemaName);
Assert.AreEqual("intnotnull", ex.DataTypeName);
}
}
}
[Test]
public void NpgsqlExceptionInAsync()
{
using (var conn = OpenConnection())
{
Assert.That(async () => await conn.ExecuteNonQueryAsync("MALFORMED"),
Throws.Exception.TypeOf<PostgresException>());
// Just in case, anything but a PostgresException would trigger the connection breaking, check that
Assert.That(conn.FullState, Is.EqualTo(ConnectionState.Open));
}
}
[Test]
public void NpgsqlExceptionTransience()
{
Assert.True(new NpgsqlException("", new IOException()).IsTransient);
Assert.True(new NpgsqlException("", new SocketException()).IsTransient);
Assert.False(new NpgsqlException().IsTransient);
Assert.False(new NpgsqlException("", new Exception("Inner Exception")).IsTransient);
}
[Test]
public void PostgresExceptionTransience()
{
Assert.True(new PostgresException { SqlState = "53300" }.IsTransient);
Assert.False(new PostgresException { SqlState = "0" }.IsTransient);
}
#if NET451
[Test]
[Ignore("DbException doesn't support serialization in .NET Core 2.0 (PlatformNotSupportedException)")]
public void Serialization()
{
var e = new PostgresException
{
Severity = "High",
TableName = "foo",
Position = 18
};
var formatter = new BinaryFormatter();
var stream = new MemoryStream();
formatter.Serialize(stream, e);
stream.Seek(0, SeekOrigin.Begin);
var e2 = (PostgresException)formatter.Deserialize(stream);
Assert.That(e2.Severity, Is.EqualTo(e.Severity));
Assert.That(e2.TableName, Is.EqualTo(e.TableName));
Assert.That(e2.Position, Is.EqualTo(e.Position));
}
#endif
}
}