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SQLLinter/Infrastructure/Rules/ColumnNullabilityRule.cs

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+using Microsoft.SqlServer.TransactSql.ScriptDom;
+using SQLLinter.Common;
+using SQLLinter.Common.Helpers;
+
+namespace SQLLinter.Infrastructure.Rules;
+
+public class ColumnNullabilityRule : BaseRuleVisitor
+{
+    public override string Text => "При объявлении таблицы необходимо указывать для столбцов NULL/NOT NULL: таблица {0} - столбец [{1}]";
+
+    private string? _currentTable;
+
+    public override void Visit(CreateTableStatement node)
+    {
+        _currentTable = SQLHelpers.ObjectGetFullName(node.SchemaObjectName);
+
+
+        foreach (var element in node.Definition.ColumnDefinitions)
+        {
+            CheckColumn(element);
+        }
+
+        _currentTable = null;
+    }
+
+    public override void Visit(AlterTableAddTableElementStatement node)
+    {
+        _currentTable = SQLHelpers.ObjectGetFullName(node.SchemaObjectName);
+
+        foreach (var element in node.Definition.ColumnDefinitions)
+        {
+            CheckColumn(element);
+        }
+
+        _currentTable = null;
+    }
+
+    public override void Visit(AlterTableAlterColumnStatement node)
+    {
+        _currentTable = SQLHelpers.ObjectGetFullName(node.SchemaObjectName);
+
+        bool hasNullabilityConstraint = node.Options
+            .OfType<NullableConstraintDefinition>()
+            .Any();
+
+        if (!hasNullabilityConstraint)
+        {
+            AddViolation(node,
+                _currentTable ?? "<unknown>",
+                node.ColumnIdentifier?.Value ?? "<unknown>");
+        }
+
+        _currentTable = null;
+
+    }
+
+    public override void Visit(DeclareTableVariableStatement node)
+    {
+        _currentTable = node.Body.VariableName.Value;
+
+        foreach (var column in node.Body.Definition.ColumnDefinitions)
+        {
+            CheckColumn(column);
+        }
+    }
+
+    private void CheckColumn(ColumnDefinition node)
+    {
+        bool hasNullabilityConstraint = node.Constraints
+            .OfType<NullableConstraintDefinition>()
+            .Any();
+
+        if (!hasNullabilityConstraint)
+        {
+            AddViolation(node,
+                _currentTable ?? "<unknown>",
+                node.ColumnIdentifier?.Value ?? "<unknown>");
+        }
+    }
+}