protected abstract Expression VisitFromSql(FromSqlExpression fromSqlExpression);
protected override Expression VisitFromSql(FromSqlExpression fromSqlExpression) => fromSqlExpression;
protected override Expression VisitFromSql(FromSqlExpression fromSqlExpression)
{
Check.NotNull(fromSqlExpression, nameof(fromSqlExpression));
return(fromSqlExpression);
}
protected abstract Expression VisitFromSql([NotNull] FromSqlExpression fromSqlExpression);
public override Expression Visit(Expression expression)
{
if (expression is FromSqlExpression fromSql)
{
if (!_visitedFromSqlExpressions.TryGetValue(fromSql, out var updatedFromSql))
{
switch (fromSql.Arguments)
{
case ParameterExpression parameterExpression:
var parameterValues = (object[])_parametersValues[parameterExpression.Name];
var subParameters = new List <IRelationalParameter>(parameterValues.Length);
// ReSharper disable once ForCanBeConvertedToForeach
for (var i = 0; i < parameterValues.Length; i++)
{
var parameterName = _parameterNameGenerator.GenerateNext();
if (parameterValues[i] is DbParameter dbParameter)
{
if (string.IsNullOrEmpty(dbParameter.ParameterName))
{
dbParameter.ParameterName = parameterName;
}
else
{
parameterName = dbParameter.ParameterName;
}
subParameters.Add(new RawRelationalParameter(parameterName, dbParameter));
}
else
{
subParameters.Add(
new TypeMappedRelationalParameter(
parameterName,
parameterName,
_sqlExpressionFactory.GetTypeMappingForValue(parameterValues[i]),
parameterValues[i]?.GetType().IsNullableType()));
}
}
updatedFromSql = new FromSqlExpression(
fromSql.Sql,
Expression.Constant(
new CompositeRelationalParameter(
parameterExpression.Name,
subParameters)),
fromSql.Alias);
_visitedFromSqlExpressions[fromSql] = updatedFromSql;
break;
case ConstantExpression constantExpression:
var existingValues = (object[])constantExpression.Value;
var constantValues = new object[existingValues.Length];
for (var i = 0; i < existingValues.Length; i++)
{
var value = existingValues[i];
if (value is DbParameter dbParameter)
{
var parameterName = _parameterNameGenerator.GenerateNext();
if (string.IsNullOrEmpty(dbParameter.ParameterName))
{
dbParameter.ParameterName = parameterName;
}
else
{
parameterName = dbParameter.ParameterName;
}
constantValues[i] = new RawRelationalParameter(parameterName, dbParameter);
}
else
{
constantValues[i] = _sqlExpressionFactory.Constant(
value, _sqlExpressionFactory.GetTypeMappingForValue(value));
}
}
updatedFromSql = new FromSqlExpression(
fromSql.Sql,
Expression.Constant(constantValues, typeof(object[])),
fromSql.Alias);
_visitedFromSqlExpressions[fromSql] = updatedFromSql;
break;
}
}
return(updatedFromSql);
}
return(base.Visit(expression));
}
protected override Expression VisitFromSql(FromSqlExpression fromSqlExpression)
{
return(fromSqlExpression);
}
protected override Expression VisitFromSql(FromSqlExpression x)
{
return(x);
}
