private static IEnumerable <NavigationProperty> GenerateNavigationProperties(
DataTable columnsTable,
DataTable foreignKeyColumnsTable,
DataTable foreignKeysTable,
DataTable tablesTable,
Table table,
IReadOnlyCollection <Table> tables)
{
var props = new List <NavigationProperty>();
// get foreign keys
var foreignKeys = DbUtil.GetForeignKeysByTableId(
columnsTable,
foreignKeysTable,
foreignKeyColumnsTable,
tablesTable,
table.ObjectId,
table.TableName);
// for each foreign key,
foreignKeys.ForEach(a =>
{
var isDestinationForeignKeyAllNonNullable =
IsDestinationNullable(a, columnsTable);
var isSourceForeignKeyAlsoPrimaryKey =
IsSourcePrimaryKey(table, a);
var type = EntityDesignUtil.Singularize(
NamingUtil.GetTableName(a.DestinationTableName));
var srcCol = a.Columns[0].SourceColumn;
var prop = new NavigationProperty
{
DestinationMultiplicity =
// Zero: if any source foreign key columns are nullable
!isDestinationForeignKeyAllNonNullable
? Multiplicity.Zero
// One: not Zero
: Multiplicity.One,
ForeignKey = a,
// *-1, 1-0/1
Name = SourceNavPropNames.TryGetValue(
a.SourceTableName + "." + string.Join("|", a.Columns.Select(b => b.SourceColumn)),
out var sourcePropName)
? sourcePropName
: srcCol.ToLower().EndsWith("id") && srcCol.Length > 2
? srcCol.Substring(0, srcCol.Length - 2)
: type,
SourceMultiplicity = isSourceForeignKeyAlsoPrimaryKey
? Multiplicity.One
: Multiplicity.Many,
Type = type
};
// only add if not in NavigationPropertiesToSkip
if (!NavPropsToSkip.ContainsKey(table.GeneratedName + "." + prop.Name))
{
props.Add(prop);
}
// get destination table
if (tables == null)
{
return;
}
{
var destTable = tables
.FirstOrDefault(b => b.TableName == a.DestinationTableName);
type = EntityDesignUtil.Singularize(
NamingUtil.GetTableName(a.SourceTableName));
var destProp = new NavigationProperty
{
DestinationMultiplicity = prop.SourceMultiplicity,
ForeignKey = a,
InverseProperty = prop.Name,
Name = DestNavPropNames.TryGetValue(
a.SourceTableName + "." + a.Columns[0].SourceColumn,
out var destPropName)
? destPropName
: prop.SourceMultiplicity == Multiplicity.Many
? EntityDesignUtil.Pluralize(type)
: type,
SourceMultiplicity = prop.DestinationMultiplicity,
Type = prop.SourceMultiplicity == Multiplicity.Many
? "ICollection<" + type + ">"
: type
};
if (destTable != null &&
!NavPropsToSkip.ContainsKey(destTable.GeneratedName + "." + destProp.Name))
{
destTable.NavigationProperties.Add(destProp);
}
}
});
// var isManyToMany = AreAllColumnsForeignKeys
// The relationship is many-to-many only if the
// relationship table only contains primary keys
// of both entities, and no other fields.
// 0, 1, *: 0-1, 1-0, 1->1, 1<-1, 0-*, 1-*, *-0, *-1, *-*
// if 0-1,
// add single, non-nullable navigation property
// of foreign key destination table class,
// and ensure foreign key destination table class
// has non-required navigation property to current table class
// if 1-0,
// do nothing, as non-required navigation property will be added
// when processing other side of foreign key relationship
// if 1->1,
// add single, non-nullable navigation property
// of foreign key destination table class,
// and ensure foreign key destination table class
// has required navigation property to current table class
// if 1<-1,
// required navigation property will be added
// when processing other side of foreign key relationship
// if 0-*,
// add public virtual ICollection of
// foreign key destination table class,
// and ensure foreign key destination table class
// has non-required navigation property to current table class
// if 1-*,
// add public virtual ICollection
// of foreign key destination table class,
// and ensure foreign key destination table class
// has required navigation property to current table class
// if *-0,
// do nothing, as non-required navigation property will be added
// when processing other side of foreign key relationship
// if *-1,
// do nothing, as required navigation property will be added
// when processing other side of foreign key relationship
// if *-*,
// well, there are no such tables, according to the
// Entity Framework definition, which is that all columns
// in the join table being both in the join table primary key,
// and a foreign key pointing from the join table to one of the
// joined tables.
return(props);
}
public static IEnumerable <Table> GenerateAll(
DataSet ds)
{
var tables = DbUtil.GetTables(
ds.Tables["Columns"],
ds.Tables["IndexColumns"],
ds.Tables["Indexes"],
ds.Tables["Schemas"],
ds.Tables["Tables"]);
tables
.ForEach(a =>
{
a.Columns = DbUtil.GetColumnsByTableId(
ds.Tables["Columns"],
ds.Tables["Types"],
ds.Tables["DefaultConstraints"],
a.ObjectId,
a.TableName);
a.ForeignKeys = DbUtil.GetForeignKeysByTableId(
ds.Tables["Columns"],
ds.Tables["ForeignKeys"],
ds.Tables["ForeignKeyColumns"],
ds.Tables["Tables"],
a.ObjectId,
a.TableName);
a.PrimaryKeyColumns = DbUtil.GetColumnsByTableIdColumnId(
ds.Tables["Columns"],
a.ObjectId,
DbUtil.GetIndexColumnsByTableIdIndexId(
ds.Tables["IndexColumns"],
a.ObjectId,
DbUtil.GetPrimaryKeyIndexIdByTableId(
ds.Tables["Indexes"],
a.ObjectId)));
a.PrimaryKeyColumns
.ForEach(b =>
{
if (string.IsNullOrWhiteSpace(b))
{
return;
}
var kcol = a.Columns
.FirstOrDefault(c => c.Name == b);
if (kcol != null)
{
kcol.IsKey = true;
}
});
a.ActiveColumnName =
DbUtil.HasTableActiveFlag(a)
? DbUtil.GetTableActivityFieldName(a)
: null;
a.ActiveColumnValue =
DbUtil.HasTableActiveFlag(a) &&
DbUtil.GetTableActivityFieldValue(a);
});
tables.ForEach(a =>
{
a.NavigationProperties
.AddRange(GenerateNavigationProperties(
ds.Tables["Columns"],
ds.Tables["ForeignKeyColumns"],
ds.Tables["ForeignKeys"],
ds.Tables["Tables"],
a,
tables));
});
return(tables);
}