Add typed modify and join fluent extensions
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86
DynamORM/Builders/TypedJoinExtensions.cs
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86
DynamORM/Builders/TypedJoinExtensions.cs
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/*
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* DynamORM - Dynamic Object-Relational Mapping library.
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* Copyright (c) 2012-2026, Grzegorz Russek (grzegorz.russek@gmail.com)
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* All rights reserved.
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*/
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using System;
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using System.Linq;
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using System.Linq.Expressions;
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using DynamORM.Helpers;
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using DynamORM.Mapper;
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namespace DynamORM.Builders
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{
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/// <summary>Typed join helpers for typed select builder.</summary>
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public static class TypedJoinExtensions
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{
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/// <summary>Add typed join on mapped members. Supports simple equality join expression only.</summary>
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public static IDynamicTypedSelectQueryBuilder<TLeft> JoinTyped<TLeft, TRight>(
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this IDynamicTypedSelectQueryBuilder<TLeft> builder,
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string alias,
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Expression<Func<TLeft, TRight, bool>> on,
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string joinType = "INNER JOIN")
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{
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if (builder == null) throw new ArgumentNullException("builder");
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if (on == null) throw new ArgumentNullException("on");
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var rightMapper = DynamicMapperCache.GetMapper(typeof(TRight));
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if (rightMapper == null)
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throw new InvalidOperationException(string.Format("Cant assign unmapable type as a table ({0}).", typeof(TRight).FullName));
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string rightTable = string.IsNullOrEmpty(rightMapper.Table.NullOr(t => t.Name))
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? typeof(TRight).Name
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: rightMapper.Table.Name;
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string rightOwner = rightMapper.Table.NullOr(t => t.Owner);
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string rightAlias = string.IsNullOrEmpty(alias) ? "t" + (builder.Tables.Count + 1).ToString() : alias;
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var be = on.Body as BinaryExpression;
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if (be == null || be.NodeType != ExpressionType.Equal)
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throw new NotSupportedException("JoinTyped currently supports only equality join expressions.");
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string leftPrefix = builder.Tables.FirstOrDefault().NullOr(t => string.IsNullOrEmpty(t.Alias) ? t.Name : t.Alias, null);
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if (string.IsNullOrEmpty(leftPrefix))
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throw new InvalidOperationException("JoinTyped requires source table to be present.");
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string leftExpr = ResolveMappedSide(be.Left, typeof(TLeft), leftPrefix, builder.Database);
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string rightExpr = ResolveMappedSide(be.Right, typeof(TRight), rightAlias, builder.Database);
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string ownerPrefix = string.IsNullOrEmpty(rightOwner) ? string.Empty : builder.Database.DecorateName(rightOwner) + ".";
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string rightTableExpr = ownerPrefix + builder.Database.DecorateName(rightTable);
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string joinExpr = string.Format("{0} {1} AS {2} ON ({3} = {4})", joinType, rightTableExpr, rightAlias, leftExpr, rightExpr);
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builder.Join(x => joinExpr);
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return builder;
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}
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private static string ResolveMappedSide(Expression expression, Type modelType, string prefix, DynamicDatabase db)
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{
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expression = UnwrapConvert(expression);
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var member = expression as MemberExpression;
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if (member == null)
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throw new NotSupportedException("Join side must be mapped member access.");
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var mapper = DynamicMapperCache.GetMapper(modelType);
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string col = mapper.PropertyMap.TryGetValue(member.Member.Name)
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?? mapper.PropertyMap
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.Where(x => string.Equals(x.Key, member.Member.Name, StringComparison.OrdinalIgnoreCase))
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.Select(x => x.Value)
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.FirstOrDefault()
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?? member.Member.Name;
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return string.Format("{0}.{1}", prefix, db.DecorateName(col));
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}
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private static Expression UnwrapConvert(Expression expression)
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{
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while (expression is UnaryExpression &&
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(((UnaryExpression)expression).NodeType == ExpressionType.Convert ||
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((UnaryExpression)expression).NodeType == ExpressionType.ConvertChecked))
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expression = ((UnaryExpression)expression).Operand;
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return expression;
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}
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}
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}
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155
DynamORM/Builders/TypedModifyExtensions.cs
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155
DynamORM/Builders/TypedModifyExtensions.cs
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/*
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* DynamORM - Dynamic Object-Relational Mapping library.
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* Copyright (c) 2012-2026, Grzegorz Russek (grzegorz.russek@gmail.com)
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* All rights reserved.
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*/
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using System;
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using System.Linq;
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using System.Linq.Expressions;
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using DynamORM.Mapper;
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namespace DynamORM.Builders
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{
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/// <summary>Typed helper extensions for update/insert/delete fluent APIs.</summary>
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public static class TypedModifyExtensions
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{
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/// <summary>Add typed where predicate (AND-composed comparisons) for update builder.</summary>
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public static IDynamicUpdateQueryBuilder WhereTyped<T>(this IDynamicUpdateQueryBuilder builder, Expression<Func<T, bool>> predicate)
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{
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AddTypedWhere(builder, predicate == null ? null : predicate.Body);
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return builder;
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}
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/// <summary>Add typed where predicate (AND-composed comparisons) for delete builder.</summary>
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public static IDynamicDeleteQueryBuilder WhereTyped<T>(this IDynamicDeleteQueryBuilder builder, Expression<Func<T, bool>> predicate)
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{
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AddTypedWhere(builder, predicate == null ? null : predicate.Body);
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return builder;
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}
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/// <summary>Add typed value assignment for update builder.</summary>
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public static IDynamicUpdateQueryBuilder SetTyped<T, TValue>(this IDynamicUpdateQueryBuilder builder, Expression<Func<T, TValue>> selector, object value)
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{
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string col = GetColumnName(typeof(T), selector == null ? null : selector.Body);
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return builder.Values(col, value);
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}
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/// <summary>Add typed value assignment for insert builder.</summary>
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public static IDynamicInsertQueryBuilder InsertTyped<T, TValue>(this IDynamicInsertQueryBuilder builder, Expression<Func<T, TValue>> selector, object value)
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{
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string col = GetColumnName(typeof(T), selector == null ? null : selector.Body);
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return builder.Insert(col, value);
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}
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/// <summary>Insert mapped object with compile-time type information.</summary>
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public static IDynamicInsertQueryBuilder InsertTyped<T>(this IDynamicInsertQueryBuilder builder, T value) where T : class
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{
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return builder.Insert(value);
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}
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/// <summary>Update mapped object with compile-time type information.</summary>
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public static IDynamicUpdateQueryBuilder UpdateTyped<T>(this IDynamicUpdateQueryBuilder builder, T value) where T : class
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{
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return builder.Update(value);
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}
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private static void AddTypedWhere(dynamic builder, Expression expression)
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{
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if (expression == null)
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throw new ArgumentNullException("predicate");
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expression = UnwrapConvert(expression);
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BinaryExpression be = expression as BinaryExpression;
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if (be != null && (be.NodeType == ExpressionType.AndAlso || be.NodeType == ExpressionType.And))
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{
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AddTypedWhere(builder, be.Left);
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AddTypedWhere(builder, be.Right);
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return;
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}
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if (be != null)
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{
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string col = GetColumnName(GetRootParameterType(be.Left), be.Left);
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object val = EvaluateExpression(be.Right);
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switch (be.NodeType)
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{
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case ExpressionType.Equal:
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builder.Where(col, DynamicColumn.CompareOperator.Eq, val);
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return;
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case ExpressionType.NotEqual:
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builder.Where(col, DynamicColumn.CompareOperator.Not, val);
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return;
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case ExpressionType.GreaterThan:
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builder.Where(col, DynamicColumn.CompareOperator.Gt, val);
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return;
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case ExpressionType.GreaterThanOrEqual:
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builder.Where(col, DynamicColumn.CompareOperator.Gte, val);
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return;
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case ExpressionType.LessThan:
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builder.Where(col, DynamicColumn.CompareOperator.Lt, val);
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return;
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case ExpressionType.LessThanOrEqual:
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builder.Where(col, DynamicColumn.CompareOperator.Lte, val);
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return;
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}
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}
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throw new NotSupportedException(string.Format("Typed where expression is currently limited to AND-composed binary comparisons: {0}", expression));
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}
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private static Type GetRootParameterType(Expression expression)
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{
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expression = UnwrapConvert(expression);
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MemberExpression m = expression as MemberExpression;
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if (m != null && m.Expression is ParameterExpression)
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return ((ParameterExpression)m.Expression).Type;
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throw new NotSupportedException(string.Format("Unsupported typed selector: {0}", expression));
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}
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private static string GetColumnName(Type modelType, Expression expression)
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{
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if (modelType == null)
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modelType = GetRootParameterType(expression);
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expression = UnwrapConvert(expression);
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MemberExpression member = expression as MemberExpression;
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if (member == null)
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throw new NotSupportedException(string.Format("Selector must target a mapped property: {0}", expression));
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DynamicTypeMap mapper = DynamicMapperCache.GetMapper(modelType);
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if (mapper == null)
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throw new InvalidOperationException(string.Format("Cant assign unmapable type as a table ({0}).", modelType.FullName));
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string col = mapper.PropertyMap.TryGetValue(member.Member.Name)
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?? mapper.PropertyMap
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.Where(x => string.Equals(x.Key, member.Member.Name, StringComparison.OrdinalIgnoreCase))
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.Select(x => x.Value)
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.FirstOrDefault()
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?? member.Member.Name;
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return col;
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}
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private static Expression UnwrapConvert(Expression expression)
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{
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while (expression is UnaryExpression &&
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(((UnaryExpression)expression).NodeType == ExpressionType.Convert ||
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((UnaryExpression)expression).NodeType == ExpressionType.ConvertChecked))
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expression = ((UnaryExpression)expression).Operand;
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return expression;
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}
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private static object EvaluateExpression(Expression expression)
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{
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expression = UnwrapConvert(expression);
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var objectMember = Expression.Convert(expression, typeof(object));
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var getter = Expression.Lambda<Func<object>>(objectMember).Compile();
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return getter();
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}
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}
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}
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