Add support for DECIMAL UNSIGNED. Fixes #1272

Author: bgrainger

src/MySqlConnector/Core/TypeMapper.cs

@@ -50,6 +50,7 @@ private TypeMapper()
 		var typeDouble = AddDbTypeMapping(new(typeof(double), new[] { DbType.Double }, convert: static o => Convert.ToDouble(o, CultureInfo.InvariantCulture)));
 		var typeFloat = AddDbTypeMapping(new(typeof(float), new[] { DbType.Single }, convert: static o => Convert.ToSingle(o, CultureInfo.InvariantCulture)));
 		AddColumnTypeMetadata(new("DECIMAL", typeDecimal, MySqlDbType.NewDecimal, createFormat: "DECIMAL({0},{1});precision,scale"));
+		AddColumnTypeMetadata(new("DECIMAL", typeDecimal, MySqlDbType.NewDecimal, isUnsigned: true, createFormat: "DECIMAL({0},{1}) UNSIGNED;precision,scale"));
 		AddColumnTypeMetadata(new("DECIMAL", typeDecimal, MySqlDbType.Decimal));
 		AddColumnTypeMetadata(new("DOUBLE", typeDouble, MySqlDbType.Double));
 		AddColumnTypeMetadata(new("FLOAT", typeFloat, MySqlDbType.Float));

tests/IntegrationTests/StoredProcedureTests.cs

@@ -669,8 +669,9 @@ OUT param2 VARCHAR(100))
 #if !MYSQL_DATA
 	[InlineData("bool", 1)]
 	[InlineData("tinyint(1)", 1)]
+	[InlineData("decimal(10)", 10)]
 #endif
-	[InlineData("char(30)", 30)]
+    [InlineData("char(30)", 30)]
 	[InlineData("mediumtext", 0)]
 	[InlineData("varchar(50)", 50)]
 	// These return nonzero sizes for some versions of MySQL Server 8.0
@@ -713,6 +714,8 @@ public void DeriveParametersParameterSize(string parameterType, int expectedSize
 	[InlineData("char(30)", MySqlDbType.String)]
 	[InlineData("mediumtext", MySqlDbType.MediumText)]
 	[InlineData("varchar(50)", MySqlDbType.VarChar)]
+	[InlineData("decimal(10, 0)", MySqlDbType.NewDecimal)]
+	[InlineData("decimal(10, 0) unsigned", MySqlDbType.NewDecimal)]
 	public void DeriveParametersParameterType(string parameterType, MySqlDbType expectedType)
 	{
 		var csb = AppConfig.CreateConnectionStringBuilder();

tests/MySqlConnector.Tests/TypeMapperTests.cs

@@ -69,6 +69,7 @@ public void ConversionTest(object original, DbType dbType, object expected)
 	[InlineData("bigint", false, 0, DbType.Int64)]
 	[InlineData("bigint", true, 0, DbType.UInt64)]
 	[InlineData("decimal", false, 0, DbType.Decimal)]
+	[InlineData("decimal", true, 0, DbType.Decimal)]
 	[InlineData("double", false, 0, DbType.Double)]
 	[InlineData("float", false, 0, DbType.Single)]
 	[InlineData("char", false, 0, DbType.StringFixedLength)]