/// <summary>
/// Initializes a new instance of the <see cref="Column" /> class.
/// </summary>
/// <param name="tSqlObject">The TSqlObject representing the column.</param>
/// <param name="tSqlTable">The table or view this column belongs to.</param>
/// <param name="primaryKeys">The primary keys.</param>
/// <param name="foreignKeys">The foreign keys.</param>
public Column(dac.TSqlObject tSqlObject)
{
this.Name = tSqlObject.Name.Parts.Last();
if (tSqlObject.ObjectType.Name == "TableTypeColumn")
{
var sqlDataTypeName = tSqlObject.GetReferenced(dac.TableTypeColumn.DataType).ToList().First().Name.Parts.Last();
this.DataTypes = DataTypeHelper.Instance.GetMap(TypeFormat.SqlServerDbType, sqlDataTypeName);
this.IsIdentity = dac.TableTypeColumn.IsIdentity.GetValue <bool>(tSqlObject);
this.IsNullable = dac.TableTypeColumn.Nullable.GetValue <bool>(tSqlObject);
this.Precision = dac.TableTypeColumn.Precision.GetValue <int>(tSqlObject);
this.Scale = dac.TableTypeColumn.Scale.GetValue <int>(tSqlObject);
this.Length = dac.TableTypeColumn.Length.GetValue <int>(tSqlObject);
}
else
{
dac.ColumnType metaType = tSqlObject.GetMetadata <dac.ColumnType>(dac.Column.ColumnType);
switch (metaType)
{
case dac.ColumnType.Column:
case dac.ColumnType.ColumnSet:
SetProperties(tSqlObject);
break;
case dac.ColumnType.ComputedColumn:
// use the referenced column - this works for simple view referenced
// column but not for a computed expression like [Name] = [FirstName] + ' ' + [LastName]
var referenced = tSqlObject.GetReferenced().ToArray();
if (referenced.Length == 1)
{
var tSqlObjectReferenced = referenced[0];
SetProperties(tSqlObjectReferenced);
}
else
{
// TODO: how to get and evaluate the expression?
}
break;
}
}
}
private static void ReadTheModel(TSqlModel model)
{
// This will get all tables.
var tables = model.GetObjects(DacQueryScopes.Default, Table.TypeClass).ToList();
// Look up a specific table by ID. Note that if no schema is defined when creating an element, the default "dbo" schema is used
var t1 = model.GetObjects(Table.TypeClass, new ObjectIdentifier("dbo", "t1"), DacQueryScopes.UserDefined).FirstOrDefault();
// Get a the column referenced by this table, and query its length
TSqlObject column = t1.GetReferenced(Table.Columns).First(col => col.Name.Parts[2].Equals("c1"));
int columnLength = column.GetProperty <int>(Column.Length);
Console.WriteLine("Column c1 has length {0}", columnLength);
// Verify the ColumnType of this column. This can help indicate which properties will return meaningful values.
// For instance since Column.Collation is only available on a simple column, and Column.Persisted is only on computed columns
ColumnType columnType = column.GetMetadata <ColumnType>(Column.ColumnType);
Console.WriteLine("Column c1 is of type '{0}'", columnType);
}
/// <summary>
/// Initializes a new instance of the <see cref="Column" /> class.
/// </summary>
/// <param name="tSqlObject">The TSqlObject representing the column.</param>
/// <param name="tSqlTable">The table or view this column belongs to.</param>
/// <param name="primaryKeys">The primary keys.</param>
/// <param name="foreignKeys">The foreign keys.</param>
public Column(dac.TSqlObject tSqlObject, dac.TSqlObject tSqlTable, IEnumerable <dac.TSqlObject> primaryKeys, IDictionary <dac.TSqlObject, IEnumerable <ForeignKeyConstraintDefinition> > foreignKeys)
{
this.Name = tSqlObject.Name.Parts.Last();
var fullName = string.Join(".", tSqlObject.Name.Parts);
this.IsPrimaryKey = primaryKeys.Any(p => string.Join(".", p.Name.Parts) == fullName);
// Get relationships where this column is the child.
IEnumerable <ForeignKeyConstraintDefinition> myForeignKeys;
foreignKeys.TryGetValue(tSqlTable, out myForeignKeys);
myForeignKeys = myForeignKeys ?? Enumerable.Empty <ForeignKeyConstraintDefinition>();
this.ParentRelationships = from f in myForeignKeys
where f.Columns.Any(c => c.Value == this.Name)
select new RelationshipIdentifier
{
TableOrView = f.ReferenceTableName.BaseIdentifier != null ? f.ReferenceTableName.BaseIdentifier.Value : null,
Schema = f.ReferenceTableName.SchemaIdentifier != null ? f.ReferenceTableName.SchemaIdentifier.Value : null,
Database = f.ReferenceTableName.DatabaseIdentifier != null ? f.ReferenceTableName.DatabaseIdentifier.Value : null,
Columns = f.ReferencedTableColumns.Select(c => c.Value)
};
this.IsForeignKey = this.ParentRelationships.Any();
// Get relationships where this column is the parent.
var childTables = foreignKeys.Where(f => f.Value.Any(v =>
v.ReferenceTableName.BaseIdentifier.Value == tSqlTable.Name.Parts.Last() &&
v.ReferencedTableColumns.Any(c => c.Value == this.Name)));
this.ChildRelationships = from t in childTables
from r in t.Value
let tableParts = t.Key.Name.Parts.Count()
select new RelationshipIdentifier
{
TableOrView = t.Key.Name.Parts.Last(),
Schema = tableParts > 1 ? t.Key.Name.Parts.ElementAt(tableParts - 2) : null,
Database = tableParts > 2 ? t.Key.Name.Parts.ElementAt(tableParts - 3) : null,
Columns = r.Columns.Select(c => c.Value)
};
if (tSqlObject.ObjectType.Name == "TableTypeColumn")
{
var sqlDataTypeName = tSqlObject.GetReferenced(dac.TableTypeColumn.DataType).ToList().First().Name.Parts.Last();
this.DataTypes = DataTypeHelper.Instance.GetMap(TypeFormat.SqlServerDbType, sqlDataTypeName);
this.IsIdentity = dac.TableTypeColumn.IsIdentity.GetValue <bool>(tSqlObject);
this.IsNullable = dac.TableTypeColumn.Nullable.GetValue <bool>(tSqlObject);
this.Precision = dac.TableTypeColumn.Precision.GetValue <int>(tSqlObject);
this.Scale = dac.TableTypeColumn.Scale.GetValue <int>(tSqlObject);
this.Length = dac.TableTypeColumn.Length.GetValue <int>(tSqlObject);
}
else
{
dac.ColumnType metaType = tSqlObject.GetMetadata <dac.ColumnType>(dac.Column.ColumnType);
switch (metaType)
{
case dac.ColumnType.Column:
case dac.ColumnType.ColumnSet:
SetProperties(tSqlObject);
break;
case dac.ColumnType.ComputedColumn:
// use the referenced column - this works for simple view referenced
// column but not for a computed expression like [Name] = [FirstName] + ' ' + [LastName]
var referenced = tSqlObject.GetReferenced().ToArray();
if (referenced.Length == 1)
{
var tSqlObjectReferenced = referenced[0];
SetProperties(tSqlObjectReferenced);
}
else
{
// TODO: how to get and evaluate the expression?
}
break;
}
}
}