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Signum Framework Tutorials Part 2 – Southwind Logic

, 15 Nov 2012
In this part, we will focus on writing business logic, LINQ queries and explain inheritance
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using System;
using System.Collections;
using System.Collections.Generic;
using System.Data.SqlClient;
using System.Linq;
using Signum.Entities;
using Signum.Engine;
using Signum.Utilities;
using Signum.Engine.Properties;
using Signum.Entities.Reflection;
using Signum.Engine.Exceptions;
using System.Linq.Expressions;
using System.Reflection;
using Signum.Utilities.Reflection;
using System.Data;
using Signum.Utilities.ExpressionTrees;
using System.Threading;

namespace Signum.Engine.Maps
{
    public class Forbidden: HashSet<IdentifiableEntity>
    {
        internal static readonly Forbidden None = new Forbidden();
    }

    public partial class Table
    {
        class InsertCache
        {
            public string SqlInsert;
            public Func<IdentifiableEntity, Forbidden, List<SqlParameter>> InsertParameters;
            public Action<IdentifiableEntity, Forbidden> Insert;
        }

        Lazy<InsertCache> inserter;

        InsertCache InitializeInsert()
        {
            InsertCache result = new InsertCache();

            var trios = new List<Table.Trio>();
            var assigments = new List<BinaryExpression>();
            var paramIdent = Expression.Parameter(typeof(IdentifiableEntity), "ident");
            var paramForbidden = Expression.Parameter(typeof(Forbidden), "forbidden");

            var cast = Expression.Parameter(Type, "casted");
            assigments.Add(Expression.Assign(cast, Expression.Convert(paramIdent, Type)));

            foreach (var item in Fields.Values.Where(a=>!Identity || !(a.Field is FieldPrimaryKey)))
            {
                item.Field.CreateParameter(trios, assigments, Expression.Field(cast, item.FieldInfo), paramForbidden);
            }

            result.SqlInsert = "INSERT {0} ({1})\r\n VALUES ({2})".Formato(Name.SqlScape(),
                trios.ToString(p => p.SourceColumn.SqlScape(), ", "),
                trios.ToString(p => p.ParameterName, ", "));

            var expr = Expression.Lambda<Func<IdentifiableEntity, Forbidden, List<SqlParameter>>>(
                CreateBlock(trios.Select(a => a.ParameterBuilder), assigments), paramIdent, paramForbidden);

            result.InsertParameters = expr.Compile();

            if(Identity)
            {
                if(typeof(Entity).IsAssignableFrom(this.Type))
                {
                    result.Insert = (ident, forbidden) =>
                    {
                        if (ident.IdOrNull != null)
                            throw new InvalidOperationException("{0} is new, but has Id {1}".Formato(ident, ident.IdOrNull));

                        ((Entity)ident).Ticks = Transaction.StartTime.Ticks;

                        ident.id = (int)new SqlPreCommandSimple(result.SqlInsert + ";SELECT CONVERT(Int,SCOPE_IDENTITY()) AS [newID]", result.InsertParameters(ident, forbidden)).ExecuteScalar();
                    };
                }
                else
                {
                    result.Insert = (ident, forbidden) =>
                    {
                        if (ident.IdOrNull != null)
                            throw new InvalidOperationException("{0} is new, but has Id {1}".Formato(ident, ident.IdOrNull));

                        ident.id = (int)new SqlPreCommandSimple(result.SqlInsert + ";SELECT CONVERT(Int,SCOPE_IDENTITY()) AS [newID]", result.InsertParameters(ident, forbidden)).ExecuteScalar();
                    };
                }
            }
            else
            {
                if (typeof(Entity).IsAssignableFrom(this.Type))
                {
                    result.Insert = (ident, forbidden) =>
                    {
                        if (ident.IdOrNull == null)
                            throw new InvalidOperationException("{0} should have an Id, since the table has no Identity".Formato(ident, ident.IdOrNull));

                        ((Entity)ident).Ticks = Transaction.StartTime.Ticks;

                        new SqlPreCommandSimple(result.SqlInsert, result.InsertParameters(ident, forbidden)).ExecuteNonQuery();
                    };
                }
                else
                {
                    result.Insert = (ident, forbidden) =>
                    {
                        if (ident.IdOrNull == null)
                            throw new InvalidOperationException("{0} should have an Id, since the table has no Identity".Formato(ident, ident.IdOrNull));

                        new SqlPreCommandSimple(result.SqlInsert, result.InsertParameters(ident, forbidden)).ExecuteNonQuery();
                    };
                }
            }

            return result;
        }

        static FieldInfo fiId = ReflectionTools.GetFieldInfo((IdentifiableEntity i) => i.id);
        static FieldInfo fiTicks = ReflectionTools.GetFieldInfo((Entity i) => i.ticks);

        class UpdateCache
        {
            public string SqlUpdate;
            public Func<IdentifiableEntity, long, Forbidden, List<SqlParameter>> UpdateParameters;
            public Action<IdentifiableEntity, Forbidden> Update; 
        }

        Lazy<UpdateCache> updater;

        UpdateCache InitializeUpdate()
        {
            UpdateCache result = new UpdateCache();

            var trios = new List<Trio>();
            var assigments = new List<BinaryExpression>();
            var paramIdent = Expression.Parameter(typeof(IdentifiableEntity), "ident");
            var paramForbidden = Expression.Parameter(typeof(Forbidden), "forbidden");
            var paramOldTicks = Expression.Parameter(typeof(long), "oldTicks");

            var cast = Expression.Parameter(Type);
            assigments.Add(Expression.Assign(cast, Expression.Convert(paramIdent, Type)));

            foreach (var item in Fields.Values.Where(a =>!(a.Field is FieldPrimaryKey)))
            {
                item.Field.CreateParameter(trios, assigments, Expression.Field(cast, item.FieldInfo), paramForbidden);
            }

            string idParamName = SqlParameterBuilder.GetParameterName("id");

            result.SqlUpdate = "UPDATE {0} SET \r\n{1}\r\n WHERE id = {2}".Formato(Name.SqlScape(),
                    trios.ToString(p => "{0} = {1}".Formato(p.SourceColumn.SqlScape(), p.ParameterName).Indent(2), ",\r\n"),
                    idParamName);


            List<Expression> parameters = trios.Select(a => (Expression)a.ParameterBuilder).ToList();

            parameters.Add(SqlParameterBuilder.ParameterFactory(idParamName, SqlBuilder.PrimaryKeyType, false, Expression.Field(paramIdent, fiId)));

            if (typeof(Entity).IsAssignableFrom(this.Type))
            {
                string oldTicksParamName = SqlParameterBuilder.GetParameterName("old_ticks");

                result.SqlUpdate += " AND ticks = {0}".Formato(oldTicksParamName);

                parameters.Add(SqlParameterBuilder.ParameterFactory(oldTicksParamName, SqlDbType.BigInt, false, paramOldTicks));
            }

            var expr = Expression.Lambda<Func<IdentifiableEntity, long, Forbidden, List<SqlParameter>>>(
                CreateBlock(parameters, assigments), paramIdent, paramOldTicks, paramForbidden);

            result.UpdateParameters = expr.Compile();

            if (typeof(Entity).IsAssignableFrom(this.Type))
            {
                result.Update = (ident, forbidden) =>
                {
                    Entity entity = (Entity)ident;

                    long oldTicks = entity.Ticks;
                    entity.Ticks = Transaction.StartTime.Ticks;

                    int num = (int)new SqlPreCommandSimple(result.SqlUpdate, result.UpdateParameters(ident, oldTicks, forbidden)).ExecuteNonQuery();
                    if (num != 1)
                        throw new ConcurrencyException(ident.GetType(), ident.Id);
                };
            }
            else
            {
                result.Update = (ident, forbidden) =>
                {
                    int num = (int)new SqlPreCommandSimple(result.SqlUpdate, result.UpdateParameters(ident, -1, forbidden)).ExecuteNonQuery();
                    if (num != 1)
                        throw new EntityNotFoundException(ident.GetType(), ident.Id);
                };
            }

            return result;
        }

        Lazy<Action<IdentifiableEntity, Forbidden, bool>> saveCollections;

        static MethodInfo miRelationalInserts = ReflectionTools.GetMethodInfo((RelationalTable rt) => rt.RelationalInserts(null, true, null, null));

        Action<IdentifiableEntity, Forbidden, bool> InitializeCollections()
        {
            var paramIdent = Expression.Parameter(typeof(IdentifiableEntity), "ident");
            var paramForbidden = Expression.Parameter(typeof(Forbidden), "forbidden");
            var paramIsNew = Expression.Parameter(typeof(bool), "isNew");

            var entity = Expression.Parameter(Type);

            var castEntity = Expression.Assign(entity, Expression.Convert(paramIdent, Type));  

            var calls = Fields.Values.Where(ef => ef.Field is FieldMList)
                         .Select(ef=>(Expression)Expression.Call(Expression.Constant(((FieldMList)ef.Field).RelationalTable), miRelationalInserts,
                             Expression.Field(entity, ef.FieldInfo), paramIsNew, paramIdent, paramForbidden)).ToList();

            if (calls.IsEmpty())
                return null;
            else
            {
                var exp = Expression.Lambda<Action<IdentifiableEntity, Forbidden, bool>>(Expression.Block(new[] { entity },
                    calls.PreAnd(castEntity)), paramIdent, paramForbidden, paramIsNew);

                return exp.Compile();
            }
        }

        internal void Save(IdentifiableEntity ident, Forbidden forbidden)
        {
            using (HeavyProfiler.Log(role: "Table"))
            {
                bool isNew = ident.IsNew;

                if (isNew)
                {
                    inserter.Value.Insert(ident, forbidden);
                    ident.IsNew = false;
                }
                else
                {
                    updater.Value.Update(ident, forbidden);
                }

                if (forbidden.Count == 0)
                    ident.Modified = null;

                if (saveCollections.Value != null)
                    saveCollections.Value(ident, forbidden, isNew);
            }
        }

        static readonly Forbidden NullForbidden = new Forbidden();

        public SqlPreCommand InsertSqlSync(IdentifiableEntity ident, string comment = null)
        {
            bool dirty = false; 
            ident.PreSaving(ref dirty);

            var ic = inserter.Value;

            return new SqlPreCommandSimple(AddComment(ic.SqlInsert, comment), ic.InsertParameters(ident, NullForbidden)); 
        }

        static string AddComment(string sql, string comment)
        {
            if (string.IsNullOrEmpty(comment))
                return sql;

            int index = sql.IndexOf("\r\n");
            if (index == -1)
                return sql + " -- " + comment;
            else
                return sql.Insert(index, " -- " + comment); 
        }

        public SqlPreCommand UpdateSqlSync(IdentifiableEntity ident, string comment = null)
        {   
            if(comment == null)
                comment = ident.ToStr;

            bool dirty = false;
            ident.PreSaving(ref dirty);

            if (!ident.SelfModified)
                return null;

            var uc = updater.Value;

            return new SqlPreCommandSimple(AddComment(uc.SqlUpdate, comment),
                uc.UpdateParameters(ident, (ident as Entity).TryCS(a => a.Ticks) ?? -1, NullForbidden));
        }

        public class Trio
        {
            public Trio(IColumn column, Expression value)
            {
                this.SourceColumn = column.Name;
                this.ParameterName = SqlParameterBuilder.GetParameterName(column.Name);
                this.ParameterBuilder = SqlParameterBuilder.ParameterFactory(this.ParameterName, column.SqlDbType, column.Nullable, value);
            }

            public string SourceColumn;
            public string ParameterName;
            public MemberInitExpression ParameterBuilder; //Expression<SqlParameter>

            public override string ToString()
            {
                return "{0} {1} {2}".Formato(SourceColumn, ParameterName, ParameterBuilder.NiceToString());
            }
        }

        static ConstructorInfo ciNewList = ReflectionTools.GetConstuctorInfo(() => new List<SqlParameter>(1));

        public static Expression CreateBlock(IEnumerable<Expression> parameters, IEnumerable<BinaryExpression> assigments)
        {
            return Expression.Block(assigments.Select(a => (ParameterExpression)a.Left),
                assigments.Cast<Expression>().And(
                Expression.ListInit(Expression.New(ciNewList, Expression.Constant(parameters.Count())),
                parameters)));
        }
    }

    public partial class RelationalTable
    {
        string sqlDelete;
        string sqlInsert;
        Func<IdentifiableEntity, object, Forbidden, List<SqlParameter>> ParameterBuilder;

        void InitializeSaveSql()
        {
            DeleteSql();

            InsertSql();
        }

        private void DeleteSql()
        {
            sqlDelete = "DELETE {0} WHERE {1} = @{1}".Formato(Name.SqlScape(), BackReference.Name);
        }

        private void InsertSql()
        {
            var trios = new List<Table.Trio>();
            var assigments = new List<BinaryExpression>();
            var ident = Expression.Parameter(typeof(IdentifiableEntity),"ident");
            var item = Expression.Parameter(typeof(object),"item");
            var forbidden = Expression.Parameter(typeof(Forbidden),"forbidden");

            BackReference.CreateParameter(trios, assigments, ident, forbidden);
            Field.CreateParameter(trios, assigments, item, forbidden);

            sqlInsert = "INSERT {0} ({1})\r\n VALUES ({2})".Formato(Name.SqlScape(),
                trios.ToString(p => p.SourceColumn.SqlScape(), ", "),
                trios.ToString(p => p.ParameterName, ", "));

            var expr = Expression.Lambda<Func<IdentifiableEntity, object, Forbidden, List<SqlParameter>>>(
                Table.CreateBlock(trios.Select(a => a.ParameterBuilder), assigments), ident, item, forbidden);

            ParameterBuilder = expr.Compile();
        }

        internal static SqlPreCommandSimple InsertIdentity(string table, List<SqlParameter> parameters)
        {
            return new SqlPreCommandSimple("INSERT {0} ({1})\r\n VALUES ({2}); SELECT CONVERT(Int,SCOPE_IDENTITY()) AS [newID]".Formato(table,
                    parameters.ToString(p => p.SourceColumn.SqlScape(), ", "),
                    parameters.ToString(p => p.ParameterName, ", ")), parameters);
        }

        internal void RelationalInserts(Modifiable collection, bool newEntity, IdentifiableEntity ident, Forbidden forbidden)
        {
            if (collection == null)
            {
                if (!newEntity)
                    new SqlPreCommandSimple(sqlDelete,
                        new List<SqlParameter> { SqlParameterBuilder.CreateReferenceParameter(BackReference.Name, false, ident.Id) }).ExecuteNonQuery();
            }
            else
            {
                if (collection.Modified == false) // no es modificado ??
                    return;

                if (forbidden.Count == 0)
                    collection.Modified = null;

                if (!newEntity)
                    new SqlPreCommandSimple(sqlDelete,
                        new List<SqlParameter> { SqlParameterBuilder.CreateReferenceParameter(BackReference.Name, false, ident.Id) }).ExecuteNonQuery();

                foreach (object item in (IEnumerable)collection)
                {
                    new SqlPreCommandSimple(sqlInsert,
                        ParameterBuilder(ident, item, forbidden)).ExecuteNonQuery();
                }
            }
        }
    }


    public abstract partial class Field
    {
        protected internal virtual void CreateParameter(List<Table.Trio> trios, List<BinaryExpression> assigments, Expression value, Expression forbidden) { }
    }

    public partial class FieldPrimaryKey
    {
        protected internal override void CreateParameter(List<Table.Trio> trios, List<BinaryExpression> assigments, Expression value, Expression forbidden)
        {
            trios.Add(new Table.Trio(this, value));
        }
    }

    public partial class FieldValue 
    {
        protected internal override void CreateParameter(List<Table.Trio> trios, List<BinaryExpression> assigments, Expression value, Expression forbidden)
        {
            trios.Add(new Table.Trio(this, value));
        }
    }

    public static partial class FieldReferenceExtensions
    {
        static MethodInfo miGetIdForLite = ReflectionTools.GetMethodInfo(() => GetIdForLite(null, null));
        static MethodInfo miGetIdForEntity = ReflectionTools.GetMethodInfo(() => GetIdForEntity(null, null));

        public static Expression GetIdFactory(this IFieldReference fr, Expression value, Expression forbidden)
        {
            return Expression.Call(fr.IsLite ? miGetIdForLite : miGetIdForEntity, value, forbidden); 
        }

        static int? GetIdForLite(object value, Forbidden forbidden)
        {
            if (value == null)
                return null;

            Lite l = (Lite)value;
            return l.UntypedEntityOrNull == null ? l.Id :
                   forbidden.Contains(l.UntypedEntityOrNull) ? (int?)null :
                   l.RefreshId();
        }

        static int? GetIdForEntity(object value, Forbidden forbidden)
        {
            if (value == null)
                return null;

            IdentifiableEntity ie = (IdentifiableEntity)value;
            return forbidden.Contains(ie) ? (int?)null : ie.Id;
        }

        static MethodInfo miGetTypeForLite = ReflectionTools.GetMethodInfo(() => GetTypeForLite(null, null));
        static MethodInfo miGetTypeForEntity = ReflectionTools.GetMethodInfo(() => GetTypeForEntity(null, null));

        public static Expression GetTypeFactory(this IFieldReference fr, Expression value, Expression forbidden)
        {
            return Expression.Call(fr.IsLite ? miGetTypeForLite : miGetTypeForEntity, value, forbidden);
        }

        static Type GetTypeForLite(object value, Forbidden forbidden)
        {
            if (value == null)
                return null;

            Lite l = (Lite)value;
            return l.UntypedEntityOrNull == null ? l.RuntimeType :
                 forbidden.Contains(l.UntypedEntityOrNull) ? null :
                 l.RuntimeType;
        }

        static Type GetTypeForEntity(object value, Forbidden forbidden)
        {
            if (value == null)
                return null;

            IdentifiableEntity ie = (IdentifiableEntity)value;
            return forbidden.Contains(ie) ? null : ie.GetType();
        }
    }

    public partial class FieldReference
    {
        protected internal override void CreateParameter(List<Table.Trio> trios, List<BinaryExpression> assigments, Expression value, Expression forbidden)
        {
            trios.Add(new Table.Trio(this, this.GetIdFactory(value, forbidden)));
        }
    }

    public partial class FieldEnum
    {
        protected internal override void CreateParameter(List<Table.Trio> trios, List<BinaryExpression> assigments, Expression value, Expression forbidden)
        {
            trios.Add(new Table.Trio(this, Expression.Convert(value, Nullable ? typeof(int?) : typeof(int))));
        }
    }

    public partial class FieldMList
    {
    }

    public partial class FieldEmbedded
    {    
        protected internal override void CreateParameter(List<Table.Trio> trios, List<BinaryExpression> assigments, Expression value, Expression forbidden)
        {
            ParameterExpression embedded = Expression.Parameter(this.FieldType, "embedded");

            if (HasValue != null)
            {
                trios.Add(new Table.Trio(HasValue, Expression.NotEqual(value, Expression.Constant(null, FieldType))));

                assigments.Add(Expression.Assign(embedded, Expression.Convert(value, this.FieldType)));

                foreach (var ef in EmbeddedFields.Values)
                {
                    ef.Field.CreateParameter(trios, assigments,
                        Expression.Condition(
                            Expression.Equal(embedded, Expression.Constant(null, this.FieldType)),
                            Expression.Constant(null, ef.FieldInfo.FieldType.Nullify()),
                            Expression.Field(embedded, ef.FieldInfo).Nullify()), forbidden);
                }
            }
            else
            {
                assigments.Add(Expression.Assign(embedded, Expression.Convert(value.NodeType == ExpressionType.Conditional? value: Expression.Call(Expression.Constant(this), miCheckNull, value), this.FieldType)));

                foreach (var ef in EmbeddedFields.Values)
                {
                    ef.Field.CreateParameter(trios, assigments,
                        Expression.Field(embedded, ef.FieldInfo), forbidden);
                }

            }
        }

        static MethodInfo miCheckNull = ReflectionTools.GetMethodInfo((FieldEmbedded fe) => fe.CheckNull(null));
        object CheckNull(object obj)
        {
            if(obj == null)
                throw new InvalidOperationException("Impossible to save 'null' on the not-nullable embedded field of type '{0}'".Formato(this.FieldType.Name));

            return obj;
        }
    }

    public partial class FieldImplementedBy
    {
        protected internal override void CreateParameter(List<Table.Trio> trios, List<BinaryExpression> assigments, Expression value, Expression forbidden)
        {
            ParameterExpression ibType = Expression.Parameter(typeof(Type), "ibType");
            ParameterExpression ibId = Expression.Parameter(typeof(int?), "ibId");

            assigments.Add(Expression.Assign(ibType, Expression.Call(Expression.Constant(this), miCheckType, this.GetTypeFactory(value, forbidden))));
            assigments.Add(Expression.Assign(ibId, this.GetIdFactory(value, forbidden))); 

            var nullId = Expression.Constant(null, typeof(int?));

            foreach (var imp in ImplementationColumns)
            {
                trios.Add(new Table.Trio(imp.Value,
                    Expression.Condition(Expression.Equal(ibType, Expression.Constant(imp.Key)), ibId, Expression.Constant(null, typeof(int?)))
                    ));
            }
        }

        static MethodInfo miCheckType = ReflectionTools.GetMethodInfo((FieldImplementedBy fe) => fe.CheckType(null));
        
        Type CheckType(Type type)
        {
            if(type != null && !ImplementationColumns.ContainsKey(type))
                throw new InvalidOperationException("Type {0} is not a mapped type ({1})".Formato(type.Name, ImplementationColumns.Keys.ToString(k => k.Name, ", ")));

            return type;
        }
    }

    public partial class ImplementationColumn
    {

    }

    public partial class FieldImplementedByAll
    {
        protected internal override void CreateParameter(List<Table.Trio> trios, List<BinaryExpression> assigments, Expression value, Expression forbidden)
        {
            trios.Add(new Table.Trio(Column, this.GetIdFactory(value, forbidden)));
            trios.Add(new Table.Trio(ColumnTypes, Expression.Call(Expression.Constant(this), miConvertType, this.GetTypeFactory(value, forbidden))));
        }

        static MethodInfo miConvertType = ReflectionTools.GetMethodInfo((FieldImplementedByAll fe) => fe.ConvertType(null));

        int? ConvertType(Type type)
        {
            if (type == null)
                return null;

            return Schema.Current.TypeToId.GetOrThrow(type, "{0} not registered in the schema"); 
        }
    }

    
}

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About the Author

Olmo del Corral
Software Developer (Senior) Signum Software
Spain Spain
I'm Computer Scientist, one of the founders of Signum Software, and the lead developer behind Signum Framework.
 
www.signumframework.com
 
I love programming in C#, Linq, Compilers, Algorithms, Functional Programming, Computer Graphics, Maths...

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