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using System;
using System.Buffers.Binary;
using System.Collections;
using System.Data;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using Npgsql.BackendMessages;
using Npgsql.Internal;
using Npgsql.Internal.Postgres;
using Npgsql.PostgresTypes;
using Npgsql.Tests.Support;
using Npgsql.Util;
using NpgsqlTypes;
using NUnit.Framework;
using static Npgsql.Tests.TestUtil;
namespace Npgsql.Tests;
[TestFixture(CommandBehavior.Default)]
[TestFixture(CommandBehavior.SequentialAccess)]
public class ReaderTests : TestBase
{
static uint Int4Oid => PostgresMinimalDatabaseInfo.DefaultTypeCatalog.GetOid(DataTypeNames.Int4).Value;
static uint ByteaOid => PostgresMinimalDatabaseInfo.DefaultTypeCatalog.GetOid(DataTypeNames.Bytea).Value;
[Test]
public async Task Resumable_non_consumed_to_non_resumable()
{
await using var conn = await OpenConnectionAsync();
await using var cmd = new NpgsqlCommand( "SELECT 'aaaaaaaa', 1", conn);
await using var reader = await cmd.ExecuteReaderAsync(Behavior);
await reader.ReadAsync();
await reader.IsDBNullAsync(0); // resumable, no consumption
_ = reader.IsDBNull(0); // resumable, no consumption
await using var stream = await reader.GetStreamAsync(0); // non-resumable
if (IsSequential)
Assert.That(() => reader.GetString(0), Throws.Exception.TypeOf<InvalidOperationException>());
}
[Test]
public async Task Seek_columns()
{
using var conn = await OpenConnectionAsync();
using var cmd = new NpgsqlCommand("SELECT 1,2,3", conn);
using var reader = await cmd.ExecuteReaderAsync(Behavior);
Assert.That(reader.Read(), Is.True);
Assert.That(reader.GetInt32(0), Is.EqualTo(1));
if (IsSequential)
Assert.That(() => reader.GetInt32(0), Throws.Exception.TypeOf<InvalidOperationException>());
else
Assert.That(reader.GetInt32(0), Is.EqualTo(1));
Assert.That(reader.GetInt32(1), Is.EqualTo(2));
if (IsSequential)
Assert.That(() => reader.GetInt32(0), Throws.Exception.TypeOf<InvalidOperationException>());
else
Assert.That(reader.GetInt32(0), Is.EqualTo(1));
}
[Test]
public async Task No_resultset()
{
using var conn = await OpenConnectionAsync();
var table = await CreateTempTable(conn, "id INT");
using (var cmd = new NpgsqlCommand($"INSERT INTO {table} VALUES (8)", conn))
using (var reader = await cmd.ExecuteReaderAsync(Behavior))
{
Assert.That(() => reader.GetOrdinal("foo"), Throws.Exception.TypeOf<InvalidOperationException>());
Assert.That(reader.Read(), Is.False);
Assert.That(() => reader.GetOrdinal("foo"), Throws.Exception.TypeOf<InvalidOperationException>());
Assert.That(reader.FieldCount, Is.EqualTo(0));
Assert.That(reader.NextResult(), Is.False);
Assert.That(() => reader.GetOrdinal("foo"), Throws.Exception.TypeOf<InvalidOperationException>());
}
using (var cmd = new NpgsqlCommand($"SELECT 1; INSERT INTO {table} VALUES (8)", conn))
using (var reader = await cmd.ExecuteReaderAsync(Behavior))
{
await reader.NextResultAsync();
Assert.That(() => reader.GetOrdinal("foo"), Throws.Exception.TypeOf<InvalidOperationException>());
Assert.That(reader.Read(), Is.False);
Assert.That(() => reader.GetOrdinal("foo"), Throws.Exception.TypeOf<InvalidOperationException>());
Assert.That(reader.FieldCount, Is.EqualTo(0));
}
}
[Test]
public async Task Empty_resultset()
{
using var conn = await OpenConnectionAsync();
using var cmd = new NpgsqlCommand("SELECT 1 AS foo WHERE FALSE", conn);
using var reader = await cmd.ExecuteReaderAsync(Behavior);
Assert.That(reader.Read(), Is.False);
Assert.That(reader.FieldCount, Is.EqualTo(1));
Assert.That(reader.GetOrdinal("foo"), Is.EqualTo(0));
Assert.That(() => reader[0], Throws.Exception.TypeOf<InvalidOperationException>());
}
[Test]
public async Task FieldCount()
{
using var conn = await OpenConnectionAsync();
var table = await CreateTempTable(conn, "int INT");
using var cmd = new NpgsqlCommand("SELECT 1; SELECT 2,3", conn);
using (var reader = await cmd.ExecuteReaderAsync(Behavior))
{
Assert.That(reader.FieldCount, Is.EqualTo(1));
Assert.That(reader.Read(), Is.True);
Assert.That(reader.FieldCount, Is.EqualTo(1));
Assert.That(reader.Read(), Is.False);
Assert.That(reader.FieldCount, Is.EqualTo(1));
Assert.That(reader.NextResult(), Is.True);
Assert.That(reader.FieldCount, Is.EqualTo(2));
Assert.That(reader.NextResult(), Is.False);
Assert.That(reader.FieldCount, Is.EqualTo(0));
}
cmd.CommandText = $"INSERT INTO {table} (int) VALUES (1)";
using (var reader = await cmd.ExecuteReaderAsync(Behavior))
{
// Note MSDN docs that seem to say we should case -1 in this case: https://msdn.microsoft.com/en-us/library/system.data.idatarecord.fieldcount(v=vs.110).aspx
// But SqlClient returns 0
Assert.That(() => reader.FieldCount, Is.EqualTo(0));
}
}
[Test]
public async Task RecordsAffected()
{
using var conn = await OpenConnectionAsync();
var table = await CreateTempTable(conn, "int INT");
var sb = new StringBuilder();
for (var i = 0; i < 10; i++)
sb.Append($"INSERT INTO {table} (int) VALUES ({i});");
sb.Append("SELECT 1;"); // Testing, that on close reader consumes all rows (as insert doesn't have a result set, but select does)
for (var i = 10; i < 15; i++)
sb.Append($"INSERT INTO {table} (int) VALUES ({i});");
var cmd = new NpgsqlCommand(sb.ToString(), conn);
var reader = await cmd.ExecuteReaderAsync(Behavior);
reader.Close();
Assert.That(reader.RecordsAffected, Is.EqualTo(15));
cmd = new NpgsqlCommand($"SELECT * FROM {table}", conn);
reader = await cmd.ExecuteReaderAsync(Behavior);
reader.Close();
Assert.That(reader.RecordsAffected, Is.EqualTo(-1));
cmd = new NpgsqlCommand($"UPDATE {table} SET int=int+1 WHERE int > 10", conn);
reader = await cmd.ExecuteReaderAsync(Behavior);
reader.Close();
Assert.That(reader.RecordsAffected, Is.EqualTo(4));
cmd = new NpgsqlCommand($"UPDATE {table} SET int=8 WHERE int=666", conn);
reader = await cmd.ExecuteReaderAsync(Behavior);
reader.Close();
Assert.That(reader.RecordsAffected, Is.EqualTo(0));
cmd = new NpgsqlCommand($"DELETE FROM {table} WHERE int > 10", conn);
reader = await cmd.ExecuteReaderAsync(Behavior);
reader.Close();
Assert.That(reader.RecordsAffected, Is.EqualTo(4));
if (conn.PostgreSqlVersion.IsGreaterOrEqual(15))
{
cmd = new NpgsqlCommand($"MERGE INTO {table} S USING (SELECT 2 as int) T ON T.int = S.int WHEN MATCHED THEN UPDATE SET int = S.int", conn);
reader = await cmd.ExecuteReaderAsync(Behavior);
reader.Close();
Assert.That(reader.RecordsAffected, Is.EqualTo(1));
}
}
#pragma warning disable CS0618
[Test]
public async Task StatementOID_legacy_batching()
{
using var conn = await OpenConnectionAsync();
MaximumPgVersionExclusive(conn, "12.0",
"Support for 'CREATE TABLE ... WITH OIDS' has been removed in 12.0. See https://www.postgresql.org/docs/12/release-12.html#id-1.11.6.5.4");
var table = await GetTempTableName(conn);
var query = $@"
CREATE TABLE {table} (name TEXT) WITH OIDS;
INSERT INTO {table} (name) VALUES ('a');
UPDATE {table} SET name='b' WHERE name='doesnt_exist';";
using (var cmd = new NpgsqlCommand(query,conn))
{
using var reader = await cmd.ExecuteReaderAsync(Behavior);
Assert.That(reader.Statements[0].OID, Is.EqualTo(0));
Assert.That(reader.Statements[1].OID, Is.Not.EqualTo(0));
Assert.That(reader.Statements[0].OID, Is.EqualTo(0));
}
using (var cmd = new NpgsqlCommand($"SELECT name FROM {table}; DELETE FROM {table}", conn))
{
using var reader = await cmd.ExecuteReaderAsync(Behavior);
await reader.NextResultAsync(); // Consume SELECT result set
Assert.That(reader.Statements[0].OID, Is.EqualTo(0));
Assert.That(reader.Statements[1].OID, Is.EqualTo(0));
}
}
#pragma warning restore CS0618
[Test]
public async Task Get_string_with_parameter()
{
using var conn = await OpenConnectionAsync();
var table = await CreateTempTable(conn, "name TEXT");
const string text = "Random text";
await conn.ExecuteNonQueryAsync($@"INSERT INTO {table} (name) VALUES ('{text}')");
var command = new NpgsqlCommand($"SELECT name FROM {table} WHERE name = :value;", conn);
var param = new NpgsqlParameter
{
ParameterName = "value",
DbType = DbType.String,
Size = text.Length,
Value = text
};
//param.NpgsqlDbType = NpgsqlDbType.Text;
command.Parameters.Add(param);
using var dr = await command.ExecuteReaderAsync(Behavior);
dr.Read();
var result = dr.GetString(0);
Assert.That(result, Is.EqualTo(text));
}
[Test]
public async Task Get_string_with_quote_with_parameter()
{
using var conn = await OpenConnectionAsync();
var table = await GetTempTableName(conn);
await conn.ExecuteNonQueryAsync($@"
CREATE TABLE {table} (name TEXT);
INSERT INTO {table} (name) VALUES ('Text with '' single quote');");
const string test = "Text with ' single quote";
var command = new NpgsqlCommand($"SELECT name FROM {table} WHERE name = :value;", conn);
var param = new NpgsqlParameter();
param.ParameterName = "value";
param.DbType = DbType.String;
//param.NpgsqlDbType = NpgsqlDbType.Text;
param.Size = test.Length;
param.Value = test;
command.Parameters.Add(param);
using var dr = await command.ExecuteReaderAsync(Behavior);
dr.Read();
var result = dr.GetString(0);
Assert.That(result, Is.EqualTo(test));
}
[Test]
public async Task Get_value_by_name()
{
using var conn = await OpenConnectionAsync();
using var command = new NpgsqlCommand(@"SELECT 'Random text' AS real_column", conn);
using var dr = await command.ExecuteReaderAsync(Behavior);
dr.Read();
Assert.That(dr["real_column"], Is.EqualTo("Random text"));
Assert.That(() => dr["non_existing"], Throws.Exception.TypeOf<IndexOutOfRangeException>());
}
[Test]
[IssueLink("https://github.com/npgsql/npgsql/issues/794")]
public async Task GetFieldType()
{
using var conn = await OpenConnectionAsync();
using (var cmd = new NpgsqlCommand(@"SELECT 1::INT4 AS some_column", conn))
using (var reader = await cmd.ExecuteReaderAsync(Behavior))
{
reader.Read();
Assert.That(reader.GetFieldType(0), Is.SameAs(typeof(int)));
}
using (var cmd = new NpgsqlCommand(@"SELECT 1::INT4 AS some_column", conn))
{
cmd.AllResultTypesAreUnknown = true;
using (var reader = await cmd.ExecuteReaderAsync(Behavior))
{
reader.Read();
Assert.That(reader.GetFieldType(0), Is.SameAs(typeof(string)));
}
}
}
[Test, IssueLink("https://github.com/npgsql/npgsql/issues/1096")]
public async Task GetFieldType_SchemaOnly()
{
await using var conn = await OpenConnectionAsync();
await using var cmd = new NpgsqlCommand(@"SELECT 1::INT4 AS some_column", conn);
await using var reader = await cmd.ExecuteReaderAsync(Behavior | CommandBehavior.SchemaOnly);
reader.Read();
Assert.That(reader.GetFieldType(0), Is.SameAs(typeof(int)));
}
[Test]
public async Task GetPostgresType()
{
using var conn = await OpenConnectionAsync();
PostgresType intType;
using (var cmd = new NpgsqlCommand(@"SELECT 1::INTEGER AS some_column", conn))
using (var reader = await cmd.ExecuteReaderAsync(Behavior))
{
reader.Read();
intType = (PostgresBaseType)reader.GetPostgresType(0);
Assert.That(intType.Namespace, Is.EqualTo("pg_catalog"));
Assert.That(intType.Name, Is.EqualTo("integer"));
Assert.That(intType.FullName, Is.EqualTo("pg_catalog.integer"));
Assert.That(intType.DisplayName, Is.EqualTo("integer"));
Assert.That(intType.InternalName, Is.EqualTo("int4"));
}
using (var cmd = new NpgsqlCommand(@"SELECT '{1}'::INTEGER[] AS some_column", conn))
using (var reader = await cmd.ExecuteReaderAsync(Behavior))
{
reader.Read();
var intArrayType = (PostgresArrayType)reader.GetPostgresType(0);
Assert.That(intArrayType.Name, Is.EqualTo("integer[]"));
Assert.That(intArrayType.Element, Is.SameAs(intType));
Assert.That(intArrayType.DisplayName, Is.EqualTo("integer[]"));
Assert.That(intArrayType.InternalName, Is.EqualTo("_int4"));
Assert.That(intType.Array, Is.SameAs(intArrayType));
}
}
/// <seealso cref="ReaderNewSchemaTests.DataTypeName"/>
[Test, IssueLink("https://github.com/npgsql/npgsql/issues/787")]
[TestCase("integer")]
[TestCase("real")]
[TestCase("integer[]")]
[TestCase("character varying(10)")]
[TestCase("character varying")]
[TestCase("character varying(10)[]")]
[TestCase("character(10)")]
[TestCase("character")]
[TestCase("character(1)", "character")]
[TestCase("numeric(1000, 2)")]
[TestCase("numeric(1000)")]
[TestCase("numeric")]
[TestCase("timestamp without time zone")]
[TestCase("timestamp(2) without time zone")]
[TestCase("timestamp(2) with time zone")]
[TestCase("time without time zone")]
[TestCase("time(2) without time zone")]
[TestCase("time(2) with time zone")]
[TestCase("interval")]
[TestCase("interval(2)")]
[TestCase("bit", "bit(1)")]
[TestCase("bit(3)")]
[TestCase("bit varying")]
[TestCase("bit varying(3)")]
public async Task GetDataTypeName(string typeName, string? normalizedName = null)
{
if (normalizedName == null)
normalizedName = typeName;
using var conn = await OpenConnectionAsync();
using var cmd = new NpgsqlCommand($"SELECT NULL::{typeName} AS some_column", conn);
using var reader = await cmd.ExecuteReaderAsync(Behavior);
reader.Read();
Assert.That(reader.GetDataTypeName(0), Is.EqualTo(normalizedName));
}
[Test]
public async Task GetDataTypeName_enum()
{
await using var dataSource = CreateDataSource(csb => csb.MaxPoolSize = 1);
await using var conn = await dataSource.OpenConnectionAsync();
var typeName = await GetTempTypeName(conn);
await conn.ExecuteNonQueryAsync($"CREATE TYPE {typeName} AS ENUM ('one')");
conn.ReloadTypes();
await using var cmd = new NpgsqlCommand($"SELECT 'one'::{typeName}", conn);
await using var reader = await cmd.ExecuteReaderAsync(Behavior);
await reader.ReadAsync();
Assert.That(reader.GetDataTypeName(0), Is.EqualTo($"public.{typeName}"));
}
[Test]
public async Task GetDataTypeName_domain()
{
await using var dataSource = CreateDataSource(csb => csb.MaxPoolSize = 1);
await using var conn = await dataSource.OpenConnectionAsync();
var typeName = await GetTempTypeName(conn);
await conn.ExecuteNonQueryAsync($"CREATE DOMAIN {typeName} AS VARCHAR(10)");
conn.ReloadTypes();
await using var cmd = new NpgsqlCommand($"SELECT 'one'::{typeName}", conn);
await using var reader = await cmd.ExecuteReaderAsync(Behavior);
await reader.ReadAsync();
// In the RowDescription, PostgreSQL sends the type OID of the underlying type and not of the domain.
Assert.That(reader.GetDataTypeName(0), Is.EqualTo("character varying(10)"));
}
[Test, IssueLink("https://github.com/npgsql/npgsql/issues/794")]
public async Task GetDataTypeNameTypes_unknown()
{
using var conn = await OpenConnectionAsync();
using var cmd = new NpgsqlCommand(@"SELECT 1::INTEGER AS some_column", conn);
cmd.AllResultTypesAreUnknown = true;
using var reader = await cmd.ExecuteReaderAsync(Behavior);
reader.Read();
Assert.That(reader.GetDataTypeName(0), Is.EqualTo("integer"));
}
[Test]
[IssueLink("https://github.com/npgsql/npgsql/issues/791")]
[IssueLink("https://github.com/npgsql/npgsql/issues/794")]
public async Task GetDataTypeOID()
{
using var conn = await OpenConnectionAsync();
var int4OID = await conn.ExecuteScalarAsync("SELECT oid FROM pg_type WHERE typname = 'int4'");
using (var cmd = new NpgsqlCommand(@"SELECT 1::INT4 AS some_column", conn))
using (var reader = await cmd.ExecuteReaderAsync(Behavior))
{
reader.Read();
Assert.That(reader.GetDataTypeOID(0), Is.EqualTo(int4OID));
}
using (var cmd = new NpgsqlCommand(@"SELECT 1::INT4 AS some_column", conn))
{
cmd.AllResultTypesAreUnknown = true;
using (var reader = await cmd.ExecuteReaderAsync(Behavior))
{
reader.Read();
Assert.That(reader.GetDataTypeOID(0), Is.EqualTo(int4OID));
}
}
}
[Test]
public async Task GetName()
{
using var conn = await OpenConnectionAsync();
using var command = new NpgsqlCommand(@"SELECT 1 AS some_column", conn);
using var dr = await command.ExecuteReaderAsync(Behavior);
dr.Read();
Assert.That(dr.GetName(0), Is.EqualTo("some_column"));
}
[Test]
public async Task GetFieldValue_as_object()
{
using var conn = await OpenConnectionAsync();
using var cmd = new NpgsqlCommand("SELECT 'foo'::TEXT", conn);
using var reader = await cmd.ExecuteReaderAsync(Behavior);
reader.Read();
Assert.That(reader.GetFieldValue<object>(0), Is.EqualTo("foo"));
}
[Test]
public async Task GetValues()
{
using var conn = await OpenConnectionAsync();
using var command = new NpgsqlCommand(@"SELECT 'hello', 1, '2014-01-01'::DATE", conn);
using (var dr = await command.ExecuteReaderAsync(Behavior))
{
dr.Read();
var values = new object[4];
Assert.That(dr.GetValues(values), Is.EqualTo(3));
Assert.That(values, Is.EqualTo(new object?[] { "hello", 1, new DateOnly(2014, 1, 1), null }));
}
using (var dr = await command.ExecuteReaderAsync(Behavior))
{
dr.Read();
var values = new object[2];
Assert.That(dr.GetValues(values), Is.EqualTo(2));
Assert.That(values, Is.EqualTo(new object[] { "hello", 1 }));
}
}
[Test]
public async Task ExecuteReader_getting_empty_resultset_with_output_parameter()
{
using var conn = await OpenConnectionAsync();
var table = await CreateTempTable(conn, "name TEXT");
var command = new NpgsqlCommand($"SELECT * FROM {table} WHERE name = NULL;", conn);
var param = new NpgsqlParameter("some_param", NpgsqlDbType.Varchar);
param.Direction = ParameterDirection.Output;
command.Parameters.Add(param);
using var dr = await command.ExecuteReaderAsync(Behavior);
Assert.That(dr.NextResult(), Is.False);
}
[Test]
public async Task Get_value_from_empty_resultset()
{
using var conn = await OpenConnectionAsync();
var table = await CreateTempTable(conn, "name TEXT");
using var command = new NpgsqlCommand($"SELECT * FROM {table} WHERE name = :value;", conn);
const string test = "Text single quote";
var param = new NpgsqlParameter();
param.ParameterName = "value";
param.DbType = DbType.String;
//param.NpgsqlDbType = NpgsqlDbType.Text;
param.Size = test.Length;
param.Value = test;
command.Parameters.Add(param);
using var dr = await command.ExecuteReaderAsync(Behavior);
dr.Read();
// This line should throw the invalid operation exception as the datareader will
// have an empty resultset.
Assert.That(() => Console.WriteLine(dr.IsDBNull(1)),
Throws.Exception.TypeOf<InvalidOperationException>());
}
[Test]
public async Task Read_past_reader_end()
{
using var conn = await OpenConnectionAsync();
var command = new NpgsqlCommand("SELECT 1", conn);
using var dr = await command.ExecuteReaderAsync(Behavior);
while (dr.Read()) {}
Assert.That(() => dr[0], Throws.Exception.TypeOf<InvalidOperationException>());
}
[Test]
public async Task Reader_dispose_state_does_not_leak()
{
if (Behavior != CommandBehavior.Default)
return;
var startReaderClosedTcs = new TaskCompletionSource<object>(TaskCreationOptions.RunContinuationsAsynchronously);
var continueReaderClosedTcs = new TaskCompletionSource<object>(TaskCreationOptions.RunContinuationsAsynchronously);
await using var dataSource = CreateDataSource();
await using var conn1 = await dataSource.OpenConnectionAsync();
var connID = conn1.Connector!.Id;
var readerCloseTask = Task.Run(async () =>
{
using var cmd = conn1.CreateCommand();
cmd.CommandText = "SELECT 1";
await using var reader = await cmd.ExecuteReaderAsync(CommandBehavior.CloseConnection);
reader.ReaderClosed += (s, e) =>
{
startReaderClosedTcs.SetResult(new());
continueReaderClosedTcs.Task.GetAwaiter().GetResult();
};
});
await startReaderClosedTcs.Task;
await using var conn2 = await dataSource.OpenConnectionAsync();
Assert.That(conn2.Connector!.Id, Is.EqualTo(connID));
using var cmd = conn2.CreateCommand();
cmd.CommandText = "SELECT 1";
await using var reader = await cmd.ExecuteReaderAsync();
Assert.That(reader.State, Is.EqualTo(ReaderState.BeforeResult));
continueReaderClosedTcs.SetResult(new());
await readerCloseTask;
Assert.That(reader.State, Is.EqualTo(ReaderState.BeforeResult));
}
[Test]
public async Task SingleResult()
{
await using var conn = await OpenConnectionAsync();
await using var command = new NpgsqlCommand(@"SELECT 1; SELECT 2", conn);
var reader = await command.ExecuteReaderAsync(CommandBehavior.SingleResult | Behavior);
Assert.That(reader.Read(), Is.True);
Assert.That(reader.GetInt32(0), Is.EqualTo(1));
Assert.That(reader.NextResult(), Is.False);
}
[Test, IssueLink("https://github.com/npgsql/npgsql/issues/400")]
public async Task Exception_thrown_from_ExecuteReaderAsync([Values(PrepareOrNot.Prepared, PrepareOrNot.NotPrepared)] PrepareOrNot prepare)
{
using var conn = await OpenConnectionAsync();
var function = await GetTempFunctionName(conn);
await conn.ExecuteNonQueryAsync($@"
CREATE OR REPLACE FUNCTION {function}() RETURNS VOID AS
'BEGIN RAISE EXCEPTION ''testexception'' USING ERRCODE = ''12345''; END;'
LANGUAGE 'plpgsql';
");
using var cmd = new NpgsqlCommand($"SELECT {function}()", conn);
if (prepare == PrepareOrNot.Prepared)
cmd.Prepare();
Assert.That(async () => await cmd.ExecuteReaderAsync(Behavior), Throws.Exception.TypeOf<PostgresException>());
}
[Test, IssueLink("https://github.com/npgsql/npgsql/issues/1032")]
public async Task Exception_thrown_from_NextResult([Values(PrepareOrNot.Prepared, PrepareOrNot.NotPrepared)] PrepareOrNot prepare)
{
using var conn = await OpenConnectionAsync();
var function = await GetTempFunctionName(conn);
await conn.ExecuteNonQueryAsync($@"
CREATE OR REPLACE FUNCTION {function}() RETURNS VOID AS
'BEGIN RAISE EXCEPTION ''testexception'' USING ERRCODE = ''12345''; END;'
LANGUAGE 'plpgsql';
");
using var cmd = new NpgsqlCommand($"SELECT 1; SELECT {function}()", conn);
if (prepare == PrepareOrNot.Prepared)
cmd.Prepare();
using var reader = await cmd.ExecuteReaderAsync(Behavior);
Assert.That(() => reader.NextResult(), Throws.Exception.TypeOf<PostgresException>());
}
[Test, IssueLink("https://github.com/npgsql/npgsql/issues/967")]
public async Task NpgsqlException_references_BatchCommand_with_single_command([Values] bool includeFailedBatchedCommand)
{
await using var dataSource = CreateDataSource(x => x.IncludeFailedBatchedCommand = includeFailedBatchedCommand);
await using var conn = await dataSource.OpenConnectionAsync();
var function = await GetTempFunctionName(conn);
await conn.ExecuteNonQueryAsync($@"
CREATE OR REPLACE FUNCTION {function}() RETURNS VOID AS
'BEGIN RAISE EXCEPTION ''testexception'' USING ERRCODE = ''12345''; END;'
LANGUAGE 'plpgsql'");
// We use NpgsqlConnection.CreateCommand to test that the command isn't recycled when referenced in an exception
var cmd = conn.CreateCommand();
cmd.CommandText = $"SELECT {function}()";
var exception = Assert.ThrowsAsync<PostgresException>(() => cmd.ExecuteReaderAsync(Behavior))!;
if (includeFailedBatchedCommand)
Assert.That(exception.BatchCommand, Is.SameAs(cmd.InternalBatchCommands[0]));
else
Assert.That(exception.BatchCommand, Is.Null);
// Make sure the command isn't recycled by the connection when it's disposed - this is important since internal command
// resources are referenced by the exception above, which is very likely to escape the using statement of the command.
cmd.Dispose();
var cmd2 = conn.CreateCommand();
Assert.That(cmd, Is.Not.SameAs(cmd2));
}
[Test, IssueLink("https://github.com/npgsql/npgsql/issues/967")]
public async Task NpgsqlException_references_BatchCommand_with_multiple_commands([Values] bool includeFailedBatchedCommand)
{
await using var dataSource = CreateDataSource(x => x.IncludeFailedBatchedCommand = includeFailedBatchedCommand);
await using var conn = await dataSource.OpenConnectionAsync();
var function = await GetTempFunctionName(conn);
await conn.ExecuteNonQueryAsync($@"
CREATE OR REPLACE FUNCTION {function}() RETURNS VOID AS
'BEGIN RAISE EXCEPTION ''testexception'' USING ERRCODE = ''12345''; END;'
LANGUAGE 'plpgsql'");
// We use NpgsqlConnection.CreateCommand to test that the command isn't recycled when referenced in an exception
var cmd = conn.CreateCommand();
cmd.CommandText = $"SELECT 1; {function}()";
await using (var reader = await cmd.ExecuteReaderAsync(Behavior))
{
var exception = Assert.ThrowsAsync<PostgresException>(() => reader.NextResultAsync())!;
if (includeFailedBatchedCommand)
Assert.That(exception.BatchCommand, Is.SameAs(cmd.InternalBatchCommands[1]));
else
Assert.That(exception.BatchCommand, Is.Null);
}
// Make sure the command isn't recycled by the connection when it's disposed - this is important since internal command
// resources are referenced by the exception above, which is very likely to escape the using statement of the command.
cmd.Dispose();
var cmd2 = conn.CreateCommand();
Assert.That(cmd, Is.Not.SameAs(cmd2));
}
#region SchemaOnly
[Test]
public async Task SchemaOnly_returns_no_data()
{
await using var conn = await OpenConnectionAsync();
await using var cmd = new NpgsqlCommand("SELECT 1", conn);
await using var reader = await cmd.ExecuteReaderAsync(CommandBehavior.SchemaOnly);
Assert.That(reader.Read(), Is.False);
}
[Test, IssueLink("https://github.com/npgsql/npgsql/issues/2827")]
public async Task SchemaOnly_next_result_beyond_end()
{
using var conn = await OpenConnectionAsync();
var table = await CreateTempTable(conn, "id INT");
using var cmd = new NpgsqlCommand($"SELECT * FROM {table}", conn);
using var reader = await cmd.ExecuteReaderAsync(CommandBehavior.SchemaOnly);
Assert.That(reader.NextResult(), Is.False);
Assert.That(reader.NextResult(), Is.False);
}
[Test, IssueLink("https://github.com/npgsql/npgsql/issues/4124")]
public async Task SchemaOnly_GetDataTypeName_with_unsupported_type()
{
using var conn = await OpenConnectionAsync();
using var cmd = new NpgsqlCommand(@"select aggfnoid from pg_aggregate", conn);
using var reader = await cmd.ExecuteReaderAsync(CommandBehavior.SchemaOnly);
Assert.That(reader.GetDataTypeName(0), Is.EqualTo("regproc"));
}
#endregion SchemaOnly
#region GetOrdinal
[Test]
public async Task GetOrdinal()
{
using var conn = await OpenConnectionAsync();
using var command = new NpgsqlCommand(@"SELECT 0, 1 AS some_column WHERE 1=0", conn);
using var reader = await command.ExecuteReaderAsync(Behavior);
Assert.That(reader.GetOrdinal("some_column"), Is.EqualTo(1));
Assert.That(() => reader.GetOrdinal("doesn't_exist"), Throws.Exception.TypeOf<IndexOutOfRangeException>());
}
[Test]
public async Task GetOrdinal_case_insensitive()
{
using var conn = await OpenConnectionAsync();
using var command = new NpgsqlCommand("select 123 as FIELD1", conn);
using var reader = await command.ExecuteReaderAsync(Behavior);
reader.Read();
Assert.That(reader.GetOrdinal("fieLd1"), Is.EqualTo(0));
}
[Test]
public async Task GetOrdinal_kana_insensitive()
{
using var conn = await OpenConnectionAsync();
using var command = new NpgsqlCommand("select 123 as ｦｧｨｩｪｫｬ", conn);
using var reader = await command.ExecuteReaderAsync(Behavior);
reader.Read();
Assert.That(reader["ヲァィゥェォャ"], Is.EqualTo(123));
}
#endregion GetOrdinal
[Test]
public async Task Field_index_does_not_exist()
{
using var conn = await OpenConnectionAsync();
using var command = new NpgsqlCommand("SELECT 1", conn);
using var dr = await command.ExecuteReaderAsync(Behavior);
dr.Read();
Assert.That(() => dr[5], Throws.Exception.TypeOf<IndexOutOfRangeException>());
}
[Test, Description("Performs some operations while a reader is still open and checks for exceptions")]
public async Task Reader_is_still_open()
{
await using var conn = await OpenConnectionAsync();
// We might get the connection, on which the second command was already prepared, so prepare wouldn't start the UserAction
conn.UnprepareAll();
using var cmd1 = new NpgsqlCommand("SELECT 1", conn);
await using var reader1 = await cmd1.ExecuteReaderAsync(Behavior);
Assert.That(() => conn.ExecuteNonQuery("SELECT 1"), Throws.Exception.TypeOf<NpgsqlOperationInProgressException>());
Assert.That(async () => await conn.ExecuteScalarAsync("SELECT 1"), Throws.Exception.TypeOf<NpgsqlOperationInProgressException>());
using var cmd2 = new NpgsqlCommand("SELECT 2", conn);
Assert.That(() => cmd2.ExecuteReader(Behavior), Throws.Exception.TypeOf<NpgsqlOperationInProgressException>());
Assert.That(() => cmd2.Prepare(), Throws.Exception.TypeOf<NpgsqlOperationInProgressException>());
}
[Test]
public async Task Cleans_up_ok_with_dispose_calls([Values(PrepareOrNot.Prepared, PrepareOrNot.NotPrepared)] PrepareOrNot prepare)
{
using var conn = await OpenConnectionAsync();
using var command = new NpgsqlCommand("SELECT 1", conn);
using var dr = await command.ExecuteReaderAsync(Behavior);
dr.Read();
dr.Close();
using var upd = conn.CreateCommand();
upd.CommandText = "SELECT 1";
if (prepare == PrepareOrNot.Prepared)
upd.Prepare();
}
[Test]
public async Task Null()
{
using var conn = await OpenConnectionAsync();
using var cmd = new NpgsqlCommand("SELECT @p1, @p2::TEXT", conn);
cmd.Parameters.Add(new NpgsqlParameter("p1", DbType.String) { Value = DBNull.Value });
cmd.Parameters.Add(new NpgsqlParameter { ParameterName = "p2", Value = DBNull.Value });
using var reader = await cmd.ExecuteReaderAsync(Behavior);
reader.Read();
for (var i = 0; i < cmd.Parameters.Count; i++)
{
Assert.That(reader.IsDBNull(i), Is.True);
Assert.That(reader.IsDBNullAsync(i).Result, Is.True);
Assert.That(reader.GetValue(i), Is.EqualTo(DBNull.Value));
Assert.That(reader.GetFieldValue<object>(i), Is.EqualTo(DBNull.Value));
Assert.That(reader.GetProviderSpecificValue(i), Is.EqualTo(DBNull.Value));
Assert.That(() => reader.GetString(i), Throws.Exception.TypeOf<InvalidCastException>());
Assert.That(() => reader.GetStream(i), Throws.Exception.TypeOf<InvalidCastException>());
}
}
[Test]
[IssueLink("https://github.com/npgsql/npgsql/issues/742")]
[IssueLink("https://github.com/npgsql/npgsql/issues/800")]
[IssueLink("https://github.com/npgsql/npgsql/issues/1234")]
[IssueLink("https://github.com/npgsql/npgsql/issues/1898")]
public async Task HasRows([Values(PrepareOrNot.NotPrepared, PrepareOrNot.Prepared)] PrepareOrNot prepare)
{
using var conn = await OpenConnectionAsync();
var table = await CreateTempTable(conn, "name TEXT");
var command = new NpgsqlCommand($"SELECT 1; SELECT * FROM {table} WHERE name='does_not_exist'", conn);
if (prepare == PrepareOrNot.Prepared)
command.Prepare();
using (var reader = await command.ExecuteReaderAsync(Behavior))
{
Assert.That(reader.HasRows, Is.True);
Assert.That(reader.HasRows, Is.True);
Assert.That(reader.Read(), Is.True);
Assert.That(reader.HasRows, Is.True);
Assert.That(reader.Read(), Is.False);
Assert.That(reader.HasRows, Is.True);
await reader.NextResultAsync();
Assert.That(reader.HasRows, Is.False);
}
command.CommandText = $"SELECT * FROM {table}";
if (prepare == PrepareOrNot.Prepared)
command.Prepare();
using (var reader = await command.ExecuteReaderAsync(Behavior))
{
reader.Read();
Assert.That(reader.HasRows, Is.False);
}
command.CommandText = "SELECT 1";
if (prepare == PrepareOrNot.Prepared)
command.Prepare();
using (var reader = await command.ExecuteReaderAsync(Behavior))
{
reader.Read();
reader.Close();
Assert.That(() => reader.HasRows, Throws.Exception.TypeOf<InvalidOperationException>());
}
command.CommandText = $"INSERT INTO {table} (name) VALUES ('foo'); SELECT * FROM {table}";
if (prepare == PrepareOrNot.Prepared)
command.Prepare();
using (var reader = await command.ExecuteReaderAsync(Behavior))
{
Assert.That(reader.HasRows, Is.True);
reader.Read();
Assert.That(reader.GetString(0), Is.EqualTo("foo"));
}
Assert.That(await conn.ExecuteScalarAsync("SELECT 1"), Is.EqualTo(1));
}
[Test]
public async Task HasRows_without_resultset()
{
using var conn = await OpenConnectionAsync();
var table = await CreateTempTable(conn, "name TEXT");
using var command = new NpgsqlCommand($"DELETE FROM {table} WHERE name = 'unknown'", conn);
using var reader = await command.ExecuteReaderAsync(Behavior);
Assert.That(reader.HasRows, Is.False);
}
[Test]
public async Task Interval_as_TimeSpan()
{
using var conn = await OpenConnectionAsync();
using var command = new NpgsqlCommand("SELECT CAST('1 hour' AS interval) AS dauer", conn);
using var dr = await command.ExecuteReaderAsync(Behavior);
Assert.That(dr.HasRows);
Assert.That(dr.Read());
Assert.That(dr.HasRows);
var ts = dr.GetTimeSpan(0);
}
[Test, IssueLink("https://github.com/npgsql/npgsql/issues/5439")]
public async Task SequentialBufferedSeek()
{
await using var conn = await OpenConnectionAsync();
using var cmd = conn.CreateCommand();
cmd.CommandText = """select v.i, jsonb_build_object(), current_timestamp + make_interval(0, 0, 0, 0, 0, 0, v.i), null::jsonb, '{"value": 42}'::jsonb from generate_series(1, 1000) as v(i)""";
var rdr = await cmd.ExecuteReaderAsync(Behavior);
while (await rdr.ReadAsync()) {
var v1 = rdr[0];
var v2 = rdr[1];
//_ = rdr[2]; // uncomment line for successful execution
var v3 = rdr[3];
var v4 = rdr[4];
}
}
[Test, IssueLink("https://github.com/npgsql/npgsql/issues/5430")]
public async Task SequentialBufferedSeekLong()
{
await using var conn = await OpenConnectionAsync();
using var cmd = conn.CreateCommand();
cmd.CommandText = """select v.i, repeat('1', 10), repeat('2', 10), repeat('3', 10), repeat('4', 10), 1, 2 from generate_series(1, 1000) as v(i)""";
var rdr = await cmd.ExecuteReaderAsync(Behavior);
while (await rdr.ReadAsync())
{
_ = rdr[0];
_ = rdr[1];
//_ = rdr[2];
//_ = rdr[3];
//_ = rdr[4];
//_ = rdr[5]; // uncomment lines for successful execution
_ = rdr[6];
}
}
[Test, IssueLink("https://github.com/npgsql/npgsql/issues/5430")]
public async Task SequentialBufferedSeekReread()
{
await using var conn = await OpenConnectionAsync();
using var cmd = conn.CreateCommand();
cmd.CommandText = """select v.i, repeat('1', 10), repeat('2', 10), repeat('3', 10), repeat('4', 10), 1, NULL from generate_series(1, 1000) as v(i)""";
var rdr = await cmd.ExecuteReaderAsync(Behavior);
while (await rdr.ReadAsync())
{
_ = rdr[0];
_ = rdr[1];
//_ = rdr[2];
//_ = rdr[3];
//_ = rdr[4];
//_ = rdr[5]; // uncomment lines for successful execution
_ = rdr.IsDBNull(6);
_ = rdr[6];
Assert.That(rdr.IsDBNull(6));
}
}
[Test, IssueLink("https://github.com/npgsql/npgsql/issues/5484")]
public async Task GetFieldValueAsync_AsyncRead()
{
if (!IsSequential)
return;
await using var postmasterMock = PgPostmasterMock.Start(ConnectionString);
await using var dataSource = CreateDataSource(postmasterMock.ConnectionString);
await using var conn = await dataSource.OpenConnectionAsync();
var expected = new byte[10000];
expected.AsSpan().Fill(1);
var pgMock = await postmasterMock.WaitForServerConnection();
await pgMock
.WriteParseComplete()
.WriteBindComplete()
.WriteRowDescription(new FieldDescription(ByteaOid))
.WriteDataRowWithFlush(expected);
using var cmd = new NpgsqlCommand("irrelevant", conn);
var reader = await cmd.ExecuteReaderAsync(Behavior);
while (await reader.ReadAsync())
{
var task = reader.GetFieldValueAsync<object>(0);
await pgMock
.WriteCommandComplete()
.WriteReadyForQuery()
.FlushAsync();
Assert.That(await task, Is.EqualTo(expected));
}
}
[Test]
public async Task Close_connection_in_middle_of_row()
{
using var conn = await OpenConnectionAsync();
using var cmd = new NpgsqlCommand("SELECT 1, 2", conn);
using var reader = await cmd.ExecuteReaderAsync(Behavior);
reader.Read();
}
[Test, IssueLink("https://github.com/npgsql/npgsql/pull/1266")]
[Description("NextResult was throwing an ArgumentOutOfRangeException when trying to determine the statement to associate with the PostgresException")]
public async Task Reader_next_result_exception_handling()
{
using var conn = await OpenConnectionAsync();
var table1 = await GetTempTableName(conn);
var table2 = await GetTempTableName(conn);
var function = await GetTempFunctionName(conn);
var initializeTablesSql = $@"
CREATE TABLE {table1} (value int NOT NULL);
CREATE TABLE {table2} (value int UNIQUE);
ALTER TABLE ONLY {table1} ADD CONSTRAINT {table1}_{table2}_fk FOREIGN KEY (value) REFERENCES {table2}(value) DEFERRABLE INITIALLY DEFERRED;
CREATE OR REPLACE FUNCTION {function}(_value int) RETURNS int AS $BODY$
BEGIN
INSERT INTO {table1}(value) VALUES(_value);
RETURN _value;
END;