EntityFrameworkCore Scaffolding: FbDatabaseModelFactory support for data type NUMERIC

[bgrauer-atacom]

The FbDatabaseModelFactory does not support NUMERIC datatype and uses DECIMAL as fallback. This can cause data precision loss.

Adding case

WHEN 1 THEN 'NUMERIC(' || (F.RDB$FIELD_PRECISION) || ',' || ABS(F.RDB$FIELD_SCALE) || ')'

to field type case 7, 8 and 16 should resolve this.

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Additional notes:

• Would it generally not be better to use the explicit case (2) for decimal and return '?' for default cases?
• Precision and scale of DECIMAL data type are not returned. Intention?

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Sources:

• Language Reference v3.0 - 3.3 Fixed-Point Data Types
• Language Reference v3.0 - Appendix D: System Tables - RDP$FIELDS

[cincuranet]

Do you care to create PR?

Would it generally not be better to use the explicit case (2) for decimal and return '?' for default cases?

Sure.

Precision and scale of DECIMAL data type are not returned. Intention?

I guess, bug.

[bgrauer-atacom]

I do.

Do you mind if I do a general test case like this:

	[TestCase("SMALLINT", "SMALLINT")]
	[TestCase("INTEGER", "INTEGER")]
	[TestCase("FLOAT", "FLOAT")]
	[TestCase("DATE", "DATE")]
	[TestCase("TIME", "TIME")]
	[TestCase("CHAR(12)", "CHAR_12")]
	[TestCase("BIGINT", "BIGINT")]
	[TestCase("BOOLEAN", "BOOLEAN")]
	[TestCase("DOUBLE PRECISION", "DOUBLE_PRECISION")]
	[TestCase("TIMESTAMP", "TIMESTAMP")]
	[TestCase("VARCHAR(24)", "VARCHAR_24")]
	[TestCase("BLOB SUB_TYPE TEXT", "BLOB_TEXT")]
	[TestCase("BLOB SUB_TYPE BINARY", "BLOB_BINARY")]
	[TestCase("DECIMAL(4,1)", "DECIMAL_4_1")]
	[TestCase("DECIMAL(9,1)", "DECIMAL_9_1")]
	[TestCase("DECIMAL(18,1)", "DECIMAL_18_1")]
	[TestCase("NUMERIC(4,1)", "NUMERIC_4_1")]
	[TestCase("NUMERIC(9,1)", "NUMERIC_9_1")]
	[TestCase("NUMERIC(18,1)", "NUMERIC_18_1")]
	public async Task ReadsCorrectFieldType(string dataType, string tableSuffix)
	{
		// Arrange
		var tableName = $"TEST_READS_CORRECT_FIELD_TYPE_{tableSuffix}";
		var columnName = "FIELD";

		using var commandTable = Connection.CreateCommand();
		commandTable.CommandText = $"create table {tableName} ({columnName} {dataType})";
		await commandTable.ExecuteNonQueryAsync();

		// Act
		var modelFactory = GetModelFactory();
		var model = modelFactory.Create(Connection.ConnectionString, new DatabaseModelFactoryOptions(new string[] { tableName }));
		var table = model.Tables.Single(x => x.Name == tableName);
		var column = table.Columns.Single(x => x.Name == columnName);

		// Assert
		Assert.That(column.StoreType, Is.EqualTo(dataType));
	}

[cincuranet]

Go ahead.