internal Func <FieldReader, object> GetRowReader()
{
ParameterExpression reader = Expression.Parameter(typeof(FieldReader));
var tupleConstructor = TupleReflection.TupleChainConstructor(
table.Columns.Values.Select((c, i) => FieldReader.GetExpression(reader, i, GetColumnType(c)))
);
return(Expression.Lambda <Func <FieldReader, object> >(tupleConstructor, reader).Compile());
}
public Expression GetColumnExpression(Expression row, Alias alias, string name, Type type)
{
if (alias != Alias)
{
throw new InvalidOperationException("alias '{0}' not found".FormatWith(alias));
}
int position = Positions.GetOrThrow(name, "column name '{0}' not found in alias '" + alias + "'");
return(FieldReader.GetExpression(Expression.Property(row, miReader), position, type));
}
protected override Expression VisitMember(MemberExpression node)
{
if (node.Expression == param)
{
var field = table.GetField(node.Member);
var column = GetColumn(field);
columns.Add(column);
return(FieldReader.GetExpression(reader, columns.Count - 1, column.Type));
}
return(base.VisitMember(node));
}
protected override Expression VisitMember(MemberExpression node)
{
if (node.Expression == param)
{
var field = table.GetField(node.Member);
var column = GetColumn(field);
columns.Add(column);
return(FieldReader.GetExpression(reader, columns.Count - 1, column.Type));
}
if (node.Expression is MethodCallExpression me && me.Method.IsInstantiationOf(miMixin))
{
var type = me.Method.GetGenericArguments()[0];
var mixin = table.Mixins !.GetOrThrow(type);
var field = mixin.GetField(node.Member);
var column = GetColumn(field);
columns.Add(column);
return(FieldReader.GetExpression(reader, columns.Count - 1, column.Type));
}
return(base.VisitMember(node));
}
public static Expression GetToString(Table table, ParameterExpression reader, List <IColumn> columns)
{
LambdaExpression lambda = ExpressionCleaner.GetFieldExpansion(table.Type, CachedTableBase.ToStringMethod) !;
if (lambda == null)
{
columns.Add(table.ToStrColumn !);
return(FieldReader.GetExpression(reader, columns.Count - 1, typeof(string)));
}
ToStringExpressionVisitor toStr = new ToStringExpressionVisitor(
lambda.Parameters.SingleEx(),
reader,
columns,
table
);
var result = toStr.Visit(lambda.Body);
return(result);
}
public override void SchemaCompleted()
{
List <IColumn> columns = new List <IColumn> {
table.PrimaryKey
};
ParameterExpression reader = Expression.Parameter(typeof(FieldReader));
var expression = ToStringExpressionVisitor.GetToString(table, reader, columns);
//Query
using (ObjectName.OverrideOptions(new ObjectNameOptions {
AvoidDatabaseName = true
}))
{
string select = "SELECT {0}\r\nFROM {1} {2}\r\n".FormatWith(
columns.ToString(c => currentAlias + "." + c.Name.SqlEscape(), ", "),
table.Name.ToString(),
currentAlias.ToString());
select += this.lastPartialJoin + currentAlias + "." + table.PrimaryKey.Name.SqlEscape() + "\r\n" + this.remainingJoins;
query = new SqlPreCommandSimple(select);
}
//Reader
{
var kvpConstructor = Expression.New(CachedTableConstructor.ciKVPIntString,
CachedTableConstructor.NewPrimaryKey(FieldReader.GetExpression(reader, 0, this.table.PrimaryKey.Type)),
expression);
rowReader = Expression.Lambda <Func <FieldReader, KeyValuePair <PrimaryKey, string> > >(kvpConstructor, reader).Compile();
}
toStrings = new ResetLazy <Dictionary <PrimaryKey, string> >(() =>
{
CacheLogic.AssertSqlDependencyStarted();
var connector = (SqlConnector)Connector.Current;
var subConnector = connector.ForDatabase(table.Name.Schema?.Database);
Dictionary <PrimaryKey, string> result = new Dictionary <PrimaryKey, string>();
using (MeasureLoad())
using (Connector.Override(subConnector))
using (Transaction tr = Transaction.ForceNew(IsolationLevel.ReadCommitted))
{
if (CacheLogic.LogWriter != null)
{
CacheLogic.LogWriter.WriteLine("Load {0}".FormatWith(GetType().TypeName()));
}
((SqlConnector)Connector.Current).ExecuteDataReaderOptionalDependency(query, OnChange, fr =>
{
var kvp = rowReader(fr);
result[kvp.Key] = kvp.Value;
});
tr.Commit();
}
return(result);
}, mode: LazyThreadSafetyMode.ExecutionAndPublication);
if (this.subTables != null)
{
foreach (var item in this.subTables)
{
item.SchemaCompleted();
}
}
}
