ShowDatabasesCommand Class Reference

#include <DdlCommandExecutor.h>

Inheritance diagram for ShowDatabasesCommand:

Collaboration diagram for ShowDatabasesCommand:

Public Member Functions
	ShowDatabasesCommand (const DdlCommandData &ddl_data, std::shared_ptr< Catalog_Namespace::SessionInfo const > session_ptr)
ExecutionResult	execute (bool read_only_mode) override
Public Member Functions inherited from DdlCommand
	DdlCommand (const DdlCommandData &ddl_data, std::shared_ptr< Catalog_Namespace::SessionInfo const > session_ptr)

Additional Inherited Members
Protected Attributes inherited from DdlCommand
const DdlCommandData &	ddl_data_
std::shared_ptr < Catalog_Namespace::SessionInfo const >	session_ptr_

Detailed Description

Definition at line 229 of file DdlCommandExecutor.h.

Constructor & Destructor Documentation

ShowDatabasesCommand::ShowDatabasesCommand	(	const DdlCommandData &	ddl_data,
		std::shared_ptr< Catalog_Namespace::SessionInfo const >	session_ptr
	)

Definition at line 1795 of file DdlCommandExecutor.cpp.

    : DdlCommand(ddl_data, session_ptr) {}

Member Function Documentation

ExecutionResult ShowDatabasesCommand::execute ( bool  read_only_mode )

overridevirtual

Executes the DDL command corresponding to provided JSON payload.

Parameters

_return

result of DDL command execution (if applicable)

Implements DdlCommand.

Definition at line 1800 of file DdlCommandExecutor.cpp.

References ResultSetLogicalValuesBuilder::create(), genLiteralStr(), Catalog_Namespace::SysCatalog::getDatabaseListForUser(), legacylockmgr::getExecuteReadLock(), Catalog_Namespace::SysCatalog::instance(), kTEXT, run_benchmark_import::label, and DdlCommand::session_ptr_.

Referenced by heavydb.cursor.Cursor::executemany().

                                                                 {
  auto execute_read_lock = legacylockmgr::getExecuteReadLock();

  // valid in read_only_mode

  // label_infos -> column labels
  std::vector<std::string> labels{"Database", "Owner"};
  std::vector<TargetMetaInfo> label_infos;
  for (const auto& label : labels) {
    label_infos.emplace_back(label, SQLTypeInfo(kTEXT, true));
  }

  // Get all table names
  auto cur_user = session_ptr_->get_currentUser();
  const Catalog_Namespace::DBSummaryList db_summaries =
      Catalog_Namespace::SysCatalog::instance().getDatabaseListForUser(cur_user);

  // logical_values -> table data
  std::vector<RelLogicalValues::RowValues> logical_values;
  for (const auto& db_summary : db_summaries) {
    logical_values.emplace_back(RelLogicalValues::RowValues{});
    logical_values.back().emplace_back(genLiteralStr(db_summary.dbName));
    logical_values.back().emplace_back(genLiteralStr(db_summary.dbOwnerName));
  }

  // Create ResultSet
  std::shared_ptr<ResultSet> rSet = std::shared_ptr<ResultSet>(
      ResultSetLogicalValuesBuilder::create(label_infos, logical_values));

  return ExecutionResult(rSet, label_infos);
}

Here is the call graph for this function:

Here is the caller graph for this function:

---

The documentation for this class was generated from the following files:

• /home/jenkins-slave/workspace/core-os-doxygen/Catalog/DdlCommandExecutor.h
• /home/jenkins-slave/workspace/core-os-doxygen/Catalog/DdlCommandExecutor.cpp