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Fix SqlDataReader.IsDBNull() for json #2892

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merged 2 commits into from
Oct 1, 2024
Merged

Fix SqlDataReader.IsDBNull() for json #2892

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a67c701
Fix SqlDataReader.IsDBNull() for json (#2830)
deepaksa1 Sep 4, 2024
bd3c3c7
add CreateTable
deepaksa1 Oct 1, 2024
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4 changes: 4 additions & 0 deletions src/Microsoft.Data.SqlClient/netcore/src/Microsoft/Data/SqlClient/TdsParser.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -5820,6 +5820,10 @@ internal static object GetNullSqlValue(SqlBuffer nullVal, SqlMetaDataPriv md, Sq
}
break;

case SqlDbTypeExtensions.Json:
nullVal.SetToNullOfType(SqlBuffer.StorageType.Json);
break;

default:
Debug.Fail("unknown null sqlType!" + md.type.ToString());
break;
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4 changes: 4 additions & 0 deletions src/Microsoft.Data.SqlClient/netfx/src/Microsoft/Data/SqlClient/TdsParser.cs
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Expand Up @@ -6667,6 +6667,10 @@ internal static object GetNullSqlValue(
}
break;

case SqlDbTypeExtensions.Json:
nullVal.SetToNullOfType(SqlBuffer.StorageType.Json);
break;

default:
Debug.Fail("unknown null sqlType!" + md.type.ToString());
break;
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41 changes: 41 additions & 0 deletions src/Microsoft.Data.SqlClient/tests/ManualTests/SQL/JsonTest/JsonTest.cs
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Expand Up @@ -62,6 +62,16 @@ private void ValidateSchema(SqlDataReader reader)
}
}

private void ValidateNullJson(SqlDataReader reader)
{
while (reader.Read())
{
bool IsNull = reader.IsDBNull(0);
_output.WriteLine(IsNull ? "null" : "not null");
Assert.True(IsNull);
}
}

[ConditionalFact(typeof(DataTestUtility), nameof(DataTestUtility.IsJsonSupported))]
public void TestJsonWrite()
{
Expand Down Expand Up @@ -295,5 +305,36 @@ public async Task TestJsonReadAsync()
}
}
}

[ConditionalFact(typeof(DataTestUtility), nameof(DataTestUtility.IsJsonSupported))]
public void TestNullJson()
{
string tableName = "jsonTest";

string tableInsert = "INSERT INTO " + tableName + " VALUES (@jsonData)";
string tableRead = "SELECT * FROM " + tableName;

using SqlConnection connection = new SqlConnection(DataTestUtility.TCPConnectionString);
connection.Open();
using SqlCommand command = connection.CreateCommand();

//Create Table
DataTestUtility.CreateTable(connection, tableName, "(Data json)");

//Insert Null value
command.CommandText = tableInsert;
var parameter = new SqlParameter("@jsonData", SqlDbTypeExtensions.Json);
parameter.Value = DBNull.Value;
command.Parameters.Add(parameter);
command.ExecuteNonQuery();

//Query the table
command.CommandText = tableRead;
var reader = command.ExecuteReader();
ValidateNullJson(reader);

reader.Close();
DataTestUtility.DropTable(connection, tableName);
}
}
}
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