Drizzled Public API Documentation

alter_schema.cc
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20 
21 #include <config.h>
22 #include <drizzled/show.h>
23 #include <drizzled/session.h>
24 #include <drizzled/statement/alter_schema.h>
25 #include <drizzled/plugin/storage_engine.h>
26 #include <drizzled/schema.h>
27 #include <drizzled/message.h>
28 #include <drizzled/sql_lex.h>
29 
30 #include <string>
31 
32 using namespace std;
33 
34 namespace drizzled {
35 
36 bool statement::AlterSchema::execute()
37 {
38  if (not validateSchemaOptions())
39  return true;
40 
41  identifier::Schema schema_identifier(lex().name);
42 
43  if (not schema::check(session(), schema_identifier))
44  {
45  my_error(ER_WRONG_DB_NAME, schema_identifier);
46  return false;
47  }
48 
49  identifier::Schema identifier(lex().name);
50  message::schema::shared_ptr old_definition= plugin::StorageEngine::getSchemaDefinition(identifier);
51  if (not old_definition)
52  {
53  my_error(ER_SCHEMA_DOES_NOT_EXIST, identifier);
54  return true;
55  }
56 
57  if (session().inTransaction())
58  {
59  my_error(ER_TRANSACTIONAL_DDL_NOT_SUPPORTED, MYF(0));
60  return true;
61  }
62  /*
63  @todo right now the logic for alter schema is just sitting here, at some point this should be packaged up in a class/etc.
64  */
65 
66  // First initialize the schema message
67  drizzled::message::schema::init(schema_message, old_definition->name());
68 
69  // We set the name from the old version to keep case preference
70  schema_message.set_version(old_definition->version());
71  schema_message.set_uuid(old_definition->uuid());
72  schema_message.mutable_engine()->set_name(old_definition->engine().name());
73 
74  // We need to make sure we don't destroy any collation that might have
75  // been changed.
76  if (not schema_message.has_collation())
77  {
78  schema_message.set_collation(old_definition->collation());
79  }
80 
81  drizzled::message::update(schema_message);
82 
83  return not schema::alter(session(), schema_message, *old_definition);
84 }
85 
86 } /* namespace drizzled */