diff options
author | Boris Kolpackov <boris@codesynthesis.com> | 2013-04-05 10:16:48 +0200 |
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committer | Boris Kolpackov <boris@codesynthesis.com> | 2013-04-10 18:46:44 +0200 |
commit | 853d76b58e96aab4e6182cc1234652dfcdd74c14 (patch) | |
tree | 612e54f542dd3d6a11d8a8299f2c82f35e9e714e /odb/relational/mssql/schema.cxx | |
parent | c9dbc099d74d92b17724a24823aafe1fcc8ca7e7 (diff) |
Generate alter column migration statements
Diffstat (limited to 'odb/relational/mssql/schema.cxx')
-rw-r--r-- | odb/relational/mssql/schema.cxx | 53 |
1 files changed, 49 insertions, 4 deletions
diff --git a/odb/relational/mssql/schema.cxx b/odb/relational/mssql/schema.cxx index 03406ce..2db0c12 100644 --- a/odb/relational/mssql/schema.cxx +++ b/odb/relational/mssql/schema.cxx @@ -336,6 +336,35 @@ namespace relational }; entry<drop_index> drop_index_; + struct alter_column: relational::alter_column, context + { + alter_column (base const& x): base (x) {} + + virtual void + traverse (sema_rel::alter_column& ac) + { + assert (ac.null_altered ()); + + // Relax (NULL) in pre and tighten (NOT NULL) in post. + // + if (pre_ != ac.null ()) + return; + + using sema_rel::alter_table; + alter_table& at (static_cast<alter_table&> (ac.scope ())); + + pre_statement (); + + os << "ALTER TABLE " << quote_id (at.name ()) << endl + << " ALTER COLUMN "; + alter (ac); + os << endl; + + post_statement (); + } + }; + entry<alter_column> alter_column_; + struct alter_table_pre: relational::alter_table_pre, context { alter_table_pre (base const& x): base (x) {} @@ -352,13 +381,21 @@ namespace relational os << " ADD "; instance<create_column> c (emitter (), stream (), format_); - trav_rel::unames n; - n >> c; + trav_rel::unames n (*c); names (at, n); os << endl; post_statement (); } + + // For ALTER COLUMN, SQL Server can only have one per ALTER TABLE. + // + { + bool tl (true); // (Im)perfect forwarding. + instance<alter_column> ac (emitter (), stream (), format_, tl); + trav_rel::unames n (*ac); + names (at, n); + } } }; entry<alter_table_pre> alter_table_pre_; @@ -379,13 +416,21 @@ namespace relational os << " DROP COLUMN "; instance<drop_column> c (emitter (), stream (), format_); - trav_rel::unames n; - n >> c; + trav_rel::unames n (*c); names (at, n); os << endl; post_statement (); } + + // For ALTER COLUMN, SQL Server can only have one per ALTER TABLE. + // + { + bool fl (false); // (Im)perfect forwarding. + instance<alter_column> ac (emitter (), stream (), format_, fl); + trav_rel::unames n (*ac); + names (at, n); + } } }; entry<alter_table_post> alter_table_post_; |