DuckDB.NET/DuckDB.NET.Test/DuckDBDataReaderTests.cs at develop · skuirrels/DuckDB.NET

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using System.Threading;

namespace DuckDB.NET.Test;

public class DuckDBDataReaderTests(DuckDBDatabaseFixture db) : DuckDBTestBase(db)

{

[Fact]

public void GetOrdinalReturnsColumnIndex()

{

Command.CommandText = "CREATE TABLE GetOrdinalTests (key INTEGER, value TEXT, State Boolean)";

Command.ExecuteNonQuery();

Command.CommandText = "select * from GetOrdinalTests";

Command.UseStreamingMode = true;

var reader = Command.ExecuteReader();

reader.GetOrdinal("key").Should().Be(0);

reader.GetOrdinal("value").Should().Be(1);

reader.Invoking(dataReader => dataReader.GetOrdinal("Random")).Should().Throw<DuckDBException>();

}

[Fact]

public void GetOrdinalRepeatedColumnReturnsFirstIndex()

{

Command.CommandText = "CREATE TABLE GetOrdinalTests (key INTEGER, value TEXT, State Boolean)";

Command.ExecuteNonQuery();

Command.CommandText = "select value, key, value from GetOrdinalTests";

Command.UseStreamingMode = true;

var reader = Command.ExecuteReader();

reader.GetOrdinal("key").Should().Be(1);

reader.GetOrdinal("value").Should().Be(0);

reader.Invoking(dataReader => dataReader.GetOrdinal("Random")).Should().Throw<DuckDBException>();

}

[Fact]

public void CloseConnectionClosesConnection()

{

Command.CommandText = "CREATE TABLE CloseConnectionTests (key INTEGER, value TEXT, State Boolean)";

Command.ExecuteNonQuery();

Command.CommandText = "select * from CloseConnectionTests";

var reader = Command.ExecuteReader(CommandBehavior.CloseConnection);

reader.Close();

reader.IsClosed.Should().BeTrue();

Connection.State.Should().Be(ConnectionState.Closed);

}

[Fact]

public void ReadValueBeforeReadThrowsException()

{

Command.CommandText = "select 24";

var reader = Command.ExecuteReader();

reader.Invoking(r => r.IsDBNull(0)).Should().Throw<InvalidOperationException>();

reader.Invoking(r => r.GetValue(0)).Should().Throw<InvalidOperationException>();

reader.Invoking(r => r.GetFieldValue<int>(0)).Should().Throw<InvalidOperationException>();

}

[Fact]

public void ReaderValues()

{

Command.CommandText = "CREATE TABLE IndexerValuesTests (key INTEGER, value decimal, State Boolean, ErrorCode Integer, mean Float, stdev double)";

Command.ExecuteNonQuery();

Command.CommandText = "Insert Into IndexerValuesTests values (1, 2.4, true, null, null, null)";

Command.ExecuteNonQuery();

Command.CommandText = "Insert Into IndexerValuesTests values (2, 4.8, null, null, null, null)";

Command.ExecuteNonQuery();

Command.CommandText = "Insert Into IndexerValuesTests values (3, null, null, null, null, null)";

Command.ExecuteNonQuery();

Command.CommandText = "select * from IndexerValuesTests";

var reader = Command.ExecuteReader(CommandBehavior.CloseConnection);

reader.Read();

reader.HasRows.Should().BeTrue();

reader[0].Should().Be(reader["key"]);

reader[1].Should().Be(reader.GetDecimal(1));

reader.GetValue(2).Should().Be(reader.GetBoolean(2));

reader.GetFieldValue<bool?>(2).Should().Be(reader.GetBoolean(2));

reader[3].Should().Be(DBNull.Value);

var values = new object[6];

reader.GetValues(values);

values.Should().BeEquivalentTo(new object[] { 1, 2.4, true, DBNull.Value, DBNull.Value, DBNull.Value });

reader.GetFieldType(1).Should().Be(typeof(decimal));

reader.GetFieldType(2).Should().Be(typeof(bool));

reader.GetFieldType(4).Should().Be(typeof(float));

reader.GetFieldType(5).Should().Be(typeof(double));

reader.Read();

reader.GetDecimal(1).Should().Be(4.8m);

reader.GetFieldValue<bool?>(2).Should().BeNull();

reader.Invoking(dataReader => dataReader.GetFieldValue<bool>(2)).Should().Throw<InvalidCastException>();

reader.Invoking(dataReader => dataReader.GetFieldValue<int>(3)).Should().Throw<InvalidCastException>();

reader.Read();

reader.GetFieldValue<decimal?>(1).Should().BeNull();

reader.Invoking(dataReader => dataReader.GetFieldValue<decimal>(1)).Should().Throw<InvalidCastException>();

}

[Fact]

public void ReaderEnumerator()

{

Command.CommandText = "select 7 union select 11 order by 1";

using var reader = Command.ExecuteReader(CommandBehavior.CloseConnection);

var enumerator = reader.GetEnumerator();

enumerator.MoveNext().Should().Be(true);

(enumerator.Current as IDataRecord).GetInt32(0).Should().Be(7);

enumerator.MoveNext().Should().Be(true);

(enumerator.Current as IDataRecord).GetInt32(0).Should().Be(11);

enumerator.MoveNext().Should().Be(false);

}

[Fact]

public void ReadIntervalValues()

{

Command.CommandText = "SELECT INTERVAL 1 YEAR;";

var reader = Command.ExecuteReader();

reader.Read();

reader.GetFieldType(0).Should().Be(typeof(TimeSpan));

reader.GetDataTypeName(0).Should().Be(DuckDBType.Interval.ToString());

var interval = reader.GetFieldValue<DuckDBInterval>(0);

reader.Invoking(r => r.GetValue(0)).Should().Throw<ArgumentOutOfRangeException>();

interval.Months.Should().Be(12);

Command.CommandText = "SELECT INTERVAL '28' DAYS;";

reader = Command.ExecuteReader();

reader.Read();

interval = reader.GetFieldValue<DuckDBInterval>(0);

var value = (TimeSpan)reader.GetValue(0);

var timeSpan = reader.GetFieldValue<TimeSpan>(0);

timeSpan.Days.Should().Be(28);

interval.Days.Should().Be(28);

value.Days.Should().Be(28);

Command.CommandText = "SELECT INTERVAL 30 SECONDS;";

reader = Command.ExecuteReader();

reader.Read();

interval = reader.GetFieldValue<DuckDBInterval>(0);

timeSpan = (TimeSpan)reader.GetValue(0);

interval.Micros.Should().Be(30_000_000);

timeSpan.Should().Be(TimeSpan.FromSeconds(30));

}

[Fact]

public void LoadDataTable()

{

Command.CommandText = "select 1 as num, 'text' as str, TIMESTAMP '1992-09-20 20:38:40' as tme";

var reader = Command.ExecuteReader();

var dt = new DataTable();

dt.Load(reader);

dt.Rows.Count.Should().Be(1);

}

[Fact]

public void MultipleStatementsQueryData()

{

Command.CommandText = "Select 1; Select 2";

using var reader = Command.ExecuteReader();

reader.Read();

reader.GetInt32(0).Should().Be(1);

reader.NextResult().Should().BeTrue();

reader.Read().Should().BeTrue();

reader.GetInt32(0).Should().Be(2);

reader.NextResult().Should().BeFalse();

}

[Fact]

public void MultipleStatementsQueryDataFromAll()

{

Command.CommandText = "Select 1; Select 2 where 1=0; Select 3";

using var reader = Command.ExecuteReader();

//Select 1

reader.Read();

reader.GetInt32(0).Should().Be(1);

//Select 2 where 1=0

reader.NextResult().Should().BeTrue();

reader.HasRows.Should().BeFalse();

reader.Read().Should().BeFalse();

//Select 3

reader.NextResult().Should().BeTrue();

reader.HasRows.Should().BeTrue();

reader.Read().Should().BeTrue();

reader.NextResult().Should().BeFalse();

}

[Fact]

public void ReadManyRows()

{

var table = "CREATE TABLE TableForManyRows(foo INTEGER, bar VARCHAR);";

Command.CommandText = table;

Command.ExecuteNonQuery();

var rows = 10_000;

var values = new List<KeyValuePair<int?, string>>();

using (var appender = Connection.CreateAppender("TableForManyRows"))

{

for (var i = 0; i < rows; i++)

{

var value = new string((char)('A' + i % 26), Random.Shared.Next(2, 20));

values.Add(new KeyValuePair<int?, string>(i, value));

var row = appender.CreateRow();

row

.AppendValue(i)

.AppendValue(value)

.EndRow();

}

values.Add(new KeyValuePair<int?, string>(null, null));

appender.CreateRow().AppendNullValue().AppendNullValue().EndRow();

}

Command.CommandText = "SELECT * FROM TableForManyRows";

using var reader = Command.ExecuteReader();

var readRowIndex = 0;

while (reader.Read())

{

var item = values[readRowIndex];

(reader.IsDBNull(0) ? (int?)null : reader.GetInt32(0)).Should().Be(item.Key);

(reader.IsDBNull(1) ? null : reader.GetString(1)).Should().Be(item.Value);

readRowIndex++;

}

readRowIndex.Should().Be(rows + 1);

}

[Fact]

public void ReadDateAsDateTime()

{

Command.CommandText = "CREATE TABLE intdate(foo INTEGER, bar DATE);";

Command.ExecuteNonQuery();

Command.CommandText = "INSERT INTO intdate VALUES (3, date '2001-02-03'), (5, date '2004-05-06'), (7, date '2007-08-09');";

Command.ExecuteNonQuery();

Command.CommandText = "SELECT bar FROM intdate";

using var reader = Command.ExecuteReader();

var dates = new List<DateTime>();

while (reader.Read())

{

for (int c = 0; c < reader.FieldCount; c++)

{

dates.Add(reader.GetDateTime(c));

}

dates.Should().BeEquivalentTo(new List<DateTime> { new(2001, 2, 3), new(2004, 5, 6), new(2007, 8, 9) });

}

[Fact]

public void ReadPivotStatementResult()

{

Command.CommandText = "CREATE TABLE Cities(Country VARCHAR, Name VARCHAR, Year INT, Population INT);";

Command.ExecuteNonQuery();

Command.CommandText = "Insert into Cities Values ('Georgia', 'საქართველო', 2022, 3688647)";

Command.ExecuteNonQuery();

Command.CommandText = "PIVOT Cities ON Year USING SUM(Population);";

var reader = Command.ExecuteReader();

reader.Read();

reader.HasRows.Should().BeTrue();

reader.NextResult().Should().BeFalse();

}

[Fact]

public void ReadInsertReturningClause()

{

Command.CommandText = "CREATE TABLE t2 (i INT, j INT);";

Command.ExecuteNonQuery();

Command.UseStreamingMode = true;

Command.CommandText = @"INSERT INTO t2

SELECT 2 AS i, 3 AS j

RETURNING *, i * j AS i_times_j;";

var reader = Command.ExecuteReader();

reader.Read();

reader.HasRows.Should().BeTrue();

reader.NextResult().Should().BeFalse();

}

[Fact]

public void ReadNonQueryAsResult()

{

Command.CommandText = "CREATE TABLE IndexerValuesTests (key INTEGER, value decimal, State Boolean, ErrorCode Integer, mean Float, stdev double)";

var reader = Command.ExecuteReader();

reader.HasRows.Should().BeFalse();

reader.Invoking(r => r.Close()).Should().NotThrow();

}

[Fact]

public void ReadDecimalSchema()

{

Command.CommandText = "CREATE TABLE decimaltbl(foo decimal(10,2));";

Command.ExecuteNonQuery();

Command.CommandText = "INSERT INTO decimaltbl VALUES (3.45), (9.35), (7.24);";

Command.ExecuteNonQuery();

Command.CommandText = "SELECT foo FROM decimaltbl";

using var reader = Command.ExecuteReader();

var schemaTable = reader.GetSchemaTable();

schemaTable.Rows[0]["NumericScale"].Should().Be(2);

schemaTable.Rows[0]["NumericPrecision"].Should().Be(10);

}

[Theory]

[InlineData(true)]

[InlineData(false)]

public void Repro332_SchemaTableAfterNextResult(bool streaming)

{

Command.CommandText = "SELECT 1 AS a, 2 AS b";

Command.UseStreamingMode = streaming;

using var reader = Command.ExecuteReader();

while (reader.Read()) { }

reader.NextResult().Should().BeFalse(); // exhausts result set, like DataTable.Load does

var schemaTable = reader.GetSchemaTable();

schemaTable.Rows.Count.Should().Be(2);

}

[Fact]

public void Repro332_DataTableLoad()

{

Command.CommandText = "SELECT 1 AS a, 2 AS b";

using var reader = Command.ExecuteReader();

var table = new DataTable();

table.Load(reader); // calls NextResult() internally after reading rows

var schemaTable = reader.GetSchemaTable();

schemaTable.Rows.Count.Should().Be(2);

}

[Fact]

public void ReadDecimalSchemaWithoutTableRow()

{

Command.CommandText = "CREATE TABLE decimaltbl(foo decimal(10,2));";

Command.ExecuteNonQuery();

Command.CommandText = "SELECT foo FROM decimaltbl";

using var reader = Command.ExecuteReader();

var schemaTable = reader.GetSchemaTable();

schemaTable.Rows[0]["NumericScale"].Should().Be(0);

schemaTable.Rows[0]["NumericPrecision"].Should().Be(0);

}

[Theory]

[InlineData(false)]

[InlineData(true)]

public async Task CancellingLongRunningQueryThrowsOperationCancelledException(bool useStreamingMode)

{

Command.CommandText = @"create table cnt as WITH RECURSIVE

cnt(x) AS (

SELECT 1

UNION ALL

SELECT x+1 FROM cnt

where x < 300000

) select * from cnt;";

var source = new CancellationTokenSource(1000);

Command.UseStreamingMode = useStreamingMode;

await Command.Invoking(async c => await c.ExecuteReaderAsync(source.Token)).Should().ThrowAsync<OperationCanceledException>();

}

[Theory]

[InlineData(false)]

[InlineData(true)]

public void CancellingLongRunningSyncQueryByTokenRegistrationThrowsOperationCanceledException(bool useStreamingMode)

{

Command.CommandText = @"create table cnt as WITH RECURSIVE

cnt(x) AS (

SELECT 1

UNION ALL

SELECT x+1 FROM cnt

where x < 300000

) select * from cnt;";

using var source = new CancellationTokenSource(TimeSpan.FromMilliseconds(1000));

Command.UseStreamingMode = useStreamingMode;

Command.Invoking(c =>

{

source.Token.Register(() => c.Cancel());

using var reader = c.ExecuteReader();

while (reader.Read())

{

_ = reader.GetInt32(0);

}

}).Should().Throw<OperationCanceledException>();

}

[Fact]

public void ReadVarint()

{

Command.CommandText = "SELECT (-1234)::VARINT";

var reader = Command.ExecuteReader();

reader.Read();

var value = (BigInteger)reader.GetValue(0);

}

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