/// <summary>
/// Loads the columns which are specified for this table and which have allowed data types.
/// </summary>
/// <param name="db">The database.</param>
/// <param name="table">The table.</param>
/// <param name="allowedTypes">The allowed types.</param>
/// <returns></returns>
/// <exception cref="Exception">MDF File is missing required columns or the column's data type is invalid in table {table.Name}: {missingColumns}.</exception>
private IOrderedEnumerable <Column> GetAllowedColumns(Database db, Table table)
{
var allowedColumns = F1SqlSchemaDefiniton.Columns[table.Name].Select(n => n.ToLower()).ToList();
var columns = db.Dmvs.Columns
.Where(c => c.ObjectID == table.ObjectID)
.Where(c => allowedColumns.Contains(c.Name.ToLower()))
.Where(c => _allowedTypes.Contains(c.SystemTypeID))
.OrderBy(c => c.Name);
int columnCount = columns.Count();
if (columnCount != allowedColumns.Count)
{
// Halt and explain that the MDF file is invalid.
var presentColumns = columns.Select(c => c.Name.ToLower()).ToList();
var missingColumns = ListUtilities.GetMissingValues(presentColumns, allowedColumns);
throw new Exception($"MDF File is missing required columns or the column's data type is invalid in table {table.Name}: {missingColumns}.");
}
return(columns);
}
/// <summary>
/// Initializes a new instance of the <see cref="F1SqlDatabase"/> class.
/// </summary>
/// <param name="fileName">Name of the file.</param>
/// <param name="loadData">if set to <c>true</c> [load data].</param>
/// <exception cref="Exception">MDF File is missing required tables: {missingTables}.</exception>
public F1SqlDatabase(string fileName, bool loadData = false)
{
using (var db = new Database(fileName))
{
Name = db.Name;
// Only read tables specified in the allowed table list so that we don't load a bunch of
// meaningless data in memory.
var allowedTables = F1SqlSchemaDefiniton.Tables.Select(n => n.ToLower()).ToList();
var tables = db.Dmvs.Tables
.Where(t => allowedTables.Contains(t.Name.ToLower()))
.OrderBy(t => t.Name);
int tableCount = tables.Count();
if (tableCount != allowedTables.Count)
{
// Halt and explain that the MDF file is invalid.
var presentTables = tables.Select(t => t.Name.ToLower()).ToList();
var missingTables = ListUtilities.GetMissingValues(presentTables, allowedTables);
throw new Exception($"MDF File is missing required tables: {missingTables}.");
}
// Get allowed data types (these are used when fetching column data).
var allowedTypes = db.Dmvs.Types
.Where(t => F1SqlSchemaDefiniton.SupportedDataTypes.Contains(t.Name))
.Select(t => t.SystemTypeID)
.ToList();
// Load the tables.
Tables = new F1SqlTable[tableCount];
for (int i = 0; i < tableCount; i++)
{
var table = tables.ElementAt(i);
Tables[i] = new F1SqlTable(db, table, allowedTypes, fileName, loadData);
}
// Unload the MDF file.
db.Dispose();
}
}
