/
AssemblyModelBuilder.cs
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/
AssemblyModelBuilder.cs
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using AO.DbSchema.Attributes;
using ModelSync.Library.Extensions;
using ModelSync.Library.Interfaces;
using ModelSync.Library.Models;
using ModelSync.Library.Models.Internal;
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;
using System.Reflection;
namespace ModelSync.Library.Services
{
/// <summary>
/// look back to https://github.com/adamosoftware/SchemaSync/blob/master/SchemaSync.Postulate/PostulateDbProvider.cs
/// for example/inspiration
/// </summary>
public class AssemblyModelBuilder : IAssemblyModelBuilder
{
public DataModel GetDataModel(Assembly assembly, string defaultSchema = "dbo", string defaultIdentityColumn = "Id")
{
var types = assembly.GetExportedTypes().Where(t => t.IsClass && !t.IsAbstract);
var typeTableMap = GetTypeTableMap(types, defaultSchema, defaultIdentityColumn);
DataModel result = GetDataModelInner(typeTableMap, defaultSchema, defaultIdentityColumn);
return result;
}
public static Table GetTableFromType<T>(string defaultSchema, string defaultIdentityColumn)
{
return GetTableFromType(typeof(T), defaultSchema, defaultIdentityColumn);
}
public static DataModel GetDataModelFromTypes(IEnumerable<Type> modelTypes, string defaultSchema, string defaultIdentityColumn)
{
var typeTableMap = GetTypeTableMap(modelTypes, defaultSchema, defaultIdentityColumn);
return GetDataModelInner(typeTableMap, defaultSchema, defaultIdentityColumn);
}
private static Dictionary<Type, string> DataTypes => GetSupportedTypes();
private static Dictionary<Type, string> GetSupportedTypes()
{
var nullableBaseTypes = new Dictionary<Type, string>()
{
{ typeof(int), "int" },
{ typeof(long), "bigint" },
{ typeof(short), "smallint" },
{ typeof(byte), "tinyint" },
{ typeof(DateTime), "datetime" },
{ typeof(decimal), "decimal" },
{ typeof(bool), "bit" },
{ typeof(TimeSpan), "time" },
{ typeof(Guid), "uniqueidentifier" }
};
// help from https://stackoverflow.com/a/23402195/2023653
IEnumerable<Type> getBothTypes(Type type)
{
yield return type;
yield return typeof(Nullable<>).MakeGenericType(type);
}
var results = nullableBaseTypes.Select(kp => new
{
Types = getBothTypes(kp.Key),
SqlType = kp.Value
}).SelectMany(item => item.Types.Select(t => new
{
Type = t,
item.SqlType
}));
var result = results.ToDictionary(item => item.Type, item => item.SqlType);
// string is special in that it's already nullable
result.Add(typeof(string), "nvarchar");
result.Add(typeof(byte[]), "varbinary");
return result;
}
private static DataModel GetDataModelInner(Dictionary<Type, Table> typeTableMap, string defaultSchema, string defaultIdentityColumn)
{
var result = new DataModel();
bool referencedTypeIsMapped(PropertyInfo propertyInfo, IEnumerable<string> fkPropertyNamesInner)
{
var referenced = propertyInfo.GetCustomAttribute<ReferencesAttribute>();
return (referenced != null) ?
typeTableMap.ContainsKey(referenced.PrimaryType) :
fkPropertyNamesInner.Contains(propertyInfo.Name);
};
result.Tables = typeTableMap.Select(kp => kp.Value).ToArray();
result.Schemas = result.Tables
.GroupBy(item => item.GetSchema(defaultSchema)).Select(grp => new Schema() { Name = grp.Key })
.ToArray();
// reverse the typeTableMap so we can get types from tables
var tableTypeMap = typeTableMap.ToDictionary(item => item.Value, item => item.Key);
// combine all table names with identity column to get properties that we can infer are FKs
var fkProperties = result.Tables
.Where(tbl => tbl.TryGetIdentityColumn(defaultIdentityColumn, out _))
.Select(tbl => new ForeignKeyProperty
{
PropertyName = tbl.GetBaseName() + tbl.GetIdentityColumn(defaultIdentityColumn),
PrimaryType = tableTypeMap[tbl]
}).ToArray();
var fkPropertyNames = fkProperties.Select(p => p.PropertyName);
var fkPropertyMap = fkProperties.ToDictionary(item => item.PropertyName);
result.ForeignKeys = typeTableMap
.SelectMany(kp => ForeignKeyProperties(kp.Key, fkPropertyNames))
.Where(pi => referencedTypeIsMapped(pi, fkPropertyNames))
.Select(pi => ForeignKeyFromProperty(pi, typeTableMap, fkPropertyMap, defaultSchema, defaultIdentityColumn))
.ToArray();
return result;
}
private static IEnumerable<PropertyInfo> ForeignKeyProperties(Type type, IEnumerable<string> defaultFKNames)
{
return type.GetProperties().Where(pi =>
defaultFKNames.Contains(pi.Name) ||
pi.HasAttribute<ReferencesAttribute>(out _) ||
pi.HasAttribute<ForeignKeyAttribute>(out _)); // needed for EF support, but doesn't work now
}
private static ForeignKey ForeignKeyFromProperty(PropertyInfo propertyInfo, Dictionary<Type, Table> typeTableMap, Dictionary<string, ForeignKeyProperty> fkPropertyMap, string defaultSchema, string defaultIdentityColumn)
{
var fk = propertyInfo.GetCustomAttribute<ReferencesAttribute>() ??
((fkPropertyMap.ContainsKey(propertyInfo.Name)) ?
new ReferencesAttribute(fkPropertyMap[propertyInfo.Name].PrimaryType) :
throw new Exception($"Couldn't infer foreign key info from {propertyInfo.DeclaringType.Name}.{propertyInfo.Name}"));
return new ForeignKey()
{
Name = $"FK_{GetTableConstraintName(propertyInfo.DeclaringType, defaultSchema)}_{propertyInfo.Name}",
ReferencedTable = typeTableMap[fk.PrimaryType],
Parent = typeTableMap[propertyInfo.DeclaringType],
CascadeUpdate = false,
CascadeDelete = fk.CascadeDelete,
Columns = new ForeignKey.Column[]
{
new ForeignKey.Column()
{
ReferencedName = FindIdentityProperty(fk.PrimaryType, defaultIdentityColumn).Name,
ReferencingName = propertyInfo.Name
}
}
};
}
private static Dictionary<Type, Table> GetTypeTableMap(IEnumerable<Type> modelTypes, string defaultSchema, string defaultIdentityColumn)
{
var source = modelTypes.Select(t => new
{
Type = t,
Table = GetTableFromType(t, defaultSchema, defaultIdentityColumn)
});
foreach (var item in source)
{
foreach (var col in item.Table.Columns) col.Parent = item.Table;
foreach (var ndx in item.Table.Indexes) ndx.Parent = item.Table;
}
return source.ToDictionary(item => item.Type, item => item.Table);
}
private static ObjectName GetObjectName(Type type, string defaultSchema)
{
string name = (type.HasAttribute(out TableAttribute tableAttr)) ? tableAttr.Name : type.Name;
string schema =
(type.HasAttribute(out SchemaAttribute schemaAttr)) ? schemaAttr.Name :
(tableAttr != null && !string.IsNullOrEmpty(tableAttr.Schema)) ? tableAttr.Schema :
defaultSchema;
return new ObjectName() { Schema = schema, Name = name };
}
private static string GetTableName(Type type, string defaultSchema)
{
var objName = GetObjectName(type, defaultSchema);
return $"{objName.Schema}.{objName.Name}";
}
private static string GetTableConstraintName(Type type, string defaultSchema)
{
var objName = GetObjectName(type, defaultSchema);
return (objName.Schema.Equals(defaultSchema)) ? objName.Name : objName.Schema + objName.Name;
}
private static Table GetTableFromType(Type modelType, string defaultSchema, string defaultIdentityColumn)
{
string constraintName = GetTableConstraintName(modelType, defaultSchema);
var idProperty = FindIdentityProperty(modelType, defaultIdentityColumn);
if (idProperty == null) throw new Exception($"No 'Id` or [Identity] property found on class {modelType.Name}");
IEnumerable<Index> getIndexes(Type type)
{
IndexType identityType = IndexType.PrimaryKey;
var keyColumns = type.GetProperties().Where(pi => pi.HasAttribute<KeyAttribute>(out _));
if (keyColumns.Any())
{
if (idProperty != null && keyColumns.Contains(idProperty))
{
throw new Exception($"Model property {modelType.Name}.{idProperty.Name} can be either an [Identity] or [Key] property, but not both.");
}
identityType = IndexType.UniqueConstraint;
yield return new Index()
{
Type = IndexType.PrimaryKey,
Name = $"PK_{constraintName}",
Columns = keyColumns.Select((pi, index) => new Index.Column()
{
Name = pi.Name,
Order = index,
SortDirection = SortDirection.Ascending
})
};
}
var uniqueConstraints = modelType.GetCustomAttributes<UniqueConstraintAttribute>();
foreach (var unique in uniqueConstraints)
{
string columns = string.Join("_", unique.PropertyNames);
yield return new Index()
{
Name = $"U_{constraintName}_{columns}",
Type = IndexType.UniqueConstraint,
Columns = unique.PropertyNames
.Select((name, index) => new Index.Column() { Name = name, SortDirection = SortDirection.Ascending, Order = index })
.ToArray()
};
}
string identityIndexName = (!keyColumns.Any()) ? $"PK_{constraintName}" : $"U_{constraintName}_{idProperty.Name}";
yield return new Index()
{
Type = identityType,
Name = identityIndexName,
Columns = new Index.Column[]
{
new Index.Column() { Name = idProperty.Name, Order = 1, SortDirection = SortDirection.Ascending }
}
};
}
IEnumerable<Column> getColumns(Type type)
{
List<Column> results = new List<Column>();
results.Add(GetColumnFromProperty(idProperty, defaultIdentityColumn));
var properties = type
.GetProperties().Where(pi =>
(DataTypes.ContainsKey(pi.PropertyType) || pi.PropertyType.IsEnum || pi.PropertyType.IsNullableEnum()) &&
pi.CanWrite &&
!pi.HasAttribute<NotMappedAttribute>(out _))
.Select(pi => GetColumnFromProperty(pi, defaultIdentityColumn))
.Except(results);
results.AddRange(properties);
return results;
};
var result = new Table()
{
Name = GetTableName(modelType, defaultSchema),
Columns = getColumns(modelType).ToArray(),
Indexes = getIndexes(modelType).ToArray()
};
foreach (var col in result.Columns) col.Parent = result;
foreach (var ndx in result.Indexes) ndx.Parent = result;
return result;
}
private static Column GetColumnFromProperty(PropertyInfo propertyInfo, string defaultIdentityColumn)
{
var result = new Column()
{
Name = propertyInfo.Name,
IsNullable = propertyInfo.PropertyType.IsNullable() && !propertyInfo.HasAttribute<RequiredAttribute>(out _) && !propertyInfo.HasAttribute<KeyAttribute>(out _)
};
if (DataTypes.ContainsKey(propertyInfo.PropertyType))
{
result.DataType = DataTypes[propertyInfo.PropertyType];
}
if (propertyInfo.PropertyType.IsEnum)
{
result.DataType = "int";
}
if (propertyInfo.PropertyType.IsNullableEnum())
{
result.DataType = "int";
result.IsNullable = true;
}
SetColumnProperties(propertyInfo, result, defaultIdentityColumn);
return result;
}
protected static void SetColumnProperties(PropertyInfo propertyInfo, Column column, string defaultIdentityColumn)
{
if (propertyInfo.PropertyType.Equals(typeof(string)))
{
if (propertyInfo.HasAttribute(out MaxLengthAttribute maxLength))
{
column.DataType += $"({maxLength.Length})";
}
else
{
column.DataType += "(max)";
}
}
if (propertyInfo.HasAttribute(out ColumnAttribute columnAttr))
{
if (!string.IsNullOrEmpty(columnAttr.TypeName))
{
column.DataType = columnAttr.TypeName;
}
}
if (propertyInfo.HasAttribute(out CalculatedAttribute calcAttr))
{
column.IsCalculated = true;
column.Expression = calcAttr.Expression;
}
if (IsIdentity(propertyInfo, defaultIdentityColumn))
{
var idTypes = new Dictionary<Type, string>
{
{ typeof(int), "identity(1,1)" },
{ typeof(long), "identity(1,1)" },
{ typeof(Guid), "default NewId()" }
};
if (!idTypes.ContainsKey(propertyInfo.PropertyType)) throw new Exception($"Property {propertyInfo.DeclaringType.Name}.{propertyInfo.Name} uses unsupported identity type {propertyInfo.PropertyType.Name}");
column.DataType += " " + idTypes[propertyInfo.PropertyType];
}
}
private static PropertyInfo FindIdentityProperty(Type type, string defaultIdentityColumn)
{
return type.GetProperties().Where(pi => IsIdentity(pi, defaultIdentityColumn)).FirstOrDefault();
}
private static bool IsIdentity(PropertyInfo propertyInfo, string defaultIdentityColumn)
{
return
(propertyInfo.DeclaringType.HasAttribute(out IdentityAttribute idAttr) && idAttr.PropertyName.Equals(propertyInfo.Name)) ||
(propertyInfo.Name.Equals(defaultIdentityColumn));
}
}
}