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Return empty DataTable from GetSchemaTable. #419

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Feb 13, 2020
Merged

Return empty DataTable from GetSchemaTable. #419

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310a6cb
Return empty DataTable from GetSchemaTable.
ErikEJ Feb 10, 2020
ad4d14a
Revert cleanup
ErikEJ Feb 11, 2020
04353a2
Remove whitespace
ErikEJ Feb 11, 2020
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2 changes: 1 addition & 1 deletion src/Microsoft.Data.SqlClient/netcore/src/Microsoft/Data/SqlClient/SqlDataReader.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -1476,7 +1476,7 @@ public override DataTable GetSchemaTable()
Debug.Assert(null != _metaData.schemaTable, "No schema information yet!");
}
}
return _metaData?.schemaTable;
return _metaData?.schemaTable ?? new DataTable();
}
finally
{
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7 changes: 1 addition & 6 deletions src/Microsoft.Data.SqlClient/netfx/src/Microsoft/Data/SqlClient/SqlDataReader.cs
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Expand Up @@ -1667,17 +1667,12 @@ override public DataTable GetSchemaTable()
{
if (null != this.MetaData)
{

_metaData.schemaTable = BuildSchemaTable();
Debug.Assert(null != _metaData.schemaTable, "No schema information yet!");
// filter table?
}
}
if (null != _metaData)
{
return _metaData.schemaTable;
}
return null;
return _metaData?.schemaTable ?? new DataTable();
}
finally
{
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19 changes: 18 additions & 1 deletion src/Microsoft.Data.SqlClient/tests/ManualTests/SQL/DataReaderTest/DataReaderTest.cs
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Expand Up @@ -36,7 +36,6 @@ public static void LoadReaderIntoDataTableToTestGetSchemaTable()
[CheckConnStrSetupFact]
public static void MultiQuerySchema()
{
SqlConnectionStringBuilder builder = new SqlConnectionStringBuilder(DataTestUtility.TCPConnectionString);
using (SqlConnection connection = new SqlConnection(DataTestUtility.TCPConnectionString))
{
connection.Open();
Expand Down Expand Up @@ -65,7 +64,25 @@ public static void MultiQuerySchema()
}
}

[CheckConnStrSetupFact]
public static void GetSchemaTable_returns_null_when_no_resultset()
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Test name is inversed :)

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Oh!

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Another possible note is the returned table should have no rows, but should still have the columns it has when there are rows.

{
using (SqlConnection connection = new SqlConnection(DataTestUtility.TCPConnectionString))
{
connection.Open();

using (SqlCommand command = connection.CreateCommand())
{
command.CommandText = "SELECT 1";
using (SqlDataReader reader = command.ExecuteReader())
{
reader.NextResult();
Assert.NotNull(reader.GetSchemaTable());
}
}
}
}

// Checks for the IsColumnSet bit in the GetSchemaTable for Sparse columns
[CheckConnStrSetupFact]
public static void CheckSparseColumnBit()
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