protected override Expression VisitInsertInto(SqlInsertIntoExpression insertIntoExpression)
{
var projection = insertIntoExpression.Source as SqlProjectionExpression;
if (projection == null)
{
return(insertIntoExpression);
}
if (projection.Select.From.NodeType != (ExpressionType)SqlExpressionType.Table)
{
throw new NotSupportedException();
}
var table = (SqlTableExpression)projection.Select.From;
var alias = table.Alias;
var where = AliasReferenceReplacer.Replace(projection.Select.Where, alias, table.Name);
if (where != null)
{
throw new InvalidOperationException("Inserts must only be performed on pure tables");
}
return(new SqlInsertIntoExpression(table, insertIntoExpression.ColumnNames, insertIntoExpression.ReturningAutoIncrementColumnNames, insertIntoExpression.ValueExpressions));
}
protected override Expression VisitDelete(SqlDeleteExpression deleteExpression)
{
if (!(deleteExpression.Source is SqlProjectionExpression projection))
{
return(deleteExpression);
}
if (projection.Select.From.NodeType != (ExpressionType)SqlExpressionType.Table)
{
throw new NotSupportedException();
}
var table = (SqlTableExpression)projection.Select.From;
var alias = table.Alias;
var where = AliasReferenceReplacer.Replace(projection.Select.Where, alias, table.Name);
return(new SqlDeleteExpression(table, where));
}
protected override Expression VisitUpdate(SqlUpdateExpression updateExpression)
{
var projection = updateExpression.Source as SqlProjectionExpression;
if (projection == null)
{
return(updateExpression);
}
if (projection.Select.From.NodeType != (ExpressionType)SqlExpressionType.Table)
{
throw new NotSupportedException();
}
var table = (SqlTableExpression)projection.Select.From;
var alias = table.Alias;
var where = AliasReferenceReplacer.Replace(projection.Select.Where, alias, table.Name);
return(new SqlUpdateExpression(table, updateExpression.Assignments, where));
}
