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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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#ifndef DRIZZLED_SESSION_H
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#define DRIZZLED_SESSION_H
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#include "drizzled/plugin.h"
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#include "drizzled/sql_locale.h"
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#include "drizzled/resource_context.h"
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#include "drizzled/cursor.h"
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#include "drizzled/current_session.h"
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#include "drizzled/sql_error.h"
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#include "drizzled/file_exchange.h"
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#include "drizzled/select_result_interceptor.h"
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#include "drizzled/statistics_variables.h"
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#include "drizzled/xid.h"
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#include "drizzled/query_id.h"
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#include "drizzled/named_savepoint.h"
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#include "drizzled/transaction_context.h"
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#include "drizzled/util/storable.h"
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#include "drizzled/my_hash.h"
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#include "drizzled/pthread_globals.h"
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#include <drizzled/cursor.h>
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#include <drizzled/diagnostics_area.h>
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#include <drizzled/file_exchange.h>
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#include <drizzled/identifier.h>
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#include <drizzled/lex_column.h>
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#include <drizzled/my_hash.h>
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#include <drizzled/named_savepoint.h>
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#include <drizzled/open_tables_state.h>
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#include <drizzled/plugin.h>
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#include <drizzled/plugin/authorization.h>
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#include <drizzled/pthread_globals.h>
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#include <drizzled/query_id.h>
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#include <drizzled/resource_context.h>
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#include <drizzled/sql_error.h>
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#include <drizzled/sql_lex.h>
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#include <drizzled/sql_locale.h>
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#include <drizzled/statistics_variables.h>
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#include <drizzled/table_ident.h>
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#include <drizzled/transaction_context.h>
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#include <drizzled/util/storable.h>
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#include <drizzled/var.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <algorithm>
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#include "drizzled/identifier.h"
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#include "drizzled/open_tables_state.h"
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#include "drizzled/internal_error_handler.h"
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#include "drizzled/diagnostics_area.h"
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#include "drizzled/plugin/authorization.h"
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#include <drizzled/catalog/instance.h>
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#include <drizzled/catalog/local.h>
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#include <boost/unordered_map.hpp>
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#include <drizzled/copy_info.h>
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#include <drizzled/ha_data.h>
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#include <drizzled/session/property_map.h>
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#include <drizzled/session/state.h>
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#include <drizzled/session/table_messages.h>
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#include <drizzled/session/transactions.h>
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#include <drizzled/system_variables.h>
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#include <drizzled/system_variables.h>
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#include <boost/thread/thread.hpp>
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#include <boost/thread/mutex.hpp>
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#define TC_HEURISTIC_RECOVER_ROLLBACK 2
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extern uint32_t tc_heuristic_recover;
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Local storage for proto that are tmp table. This should be enlarged
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to hande the entire table-share for a local table. Once Hash is done,
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we should consider exchanging the map for it.
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typedef std::map <std::string, message::Table> ProtoCache;
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The COPY_INFO structure is used by INSERT/REPLACE code.
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The schema of the row counting by the INSERT/INSERT ... ON DUPLICATE KEY
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If a row is inserted then the copied variable is incremented.
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If a row is updated by the INSERT ... ON DUPLICATE KEY UPDATE and the
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new data differs from the old one then the copied and the updated
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variables are incremented.
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The touched variable is incremented if a row was touched by the update part
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of the INSERT ... ON DUPLICATE KEY UPDATE no matter whether the row
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was actually changed or not.
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ha_rows records; /**< Number of processed records */
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ha_rows deleted; /**< Number of deleted records */
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ha_rows updated; /**< Number of updated records */
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ha_rows copied; /**< Number of copied records */
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ha_rows touched; /* Number of touched records */
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enum enum_duplicates handle_duplicates;
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int escape_char, last_errno;
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/* for INSERT ... UPDATE */
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List<Item> *update_fields;
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List<Item> *update_values;
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/* for VIEW ... WITH CHECK OPTION */
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} /* namespace drizzled */
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/** @TODO why is this in the middle of the file */
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#include <drizzled/lex_column.h>
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#define Session_SENTRY_MAGIC 0xfeedd1ff
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#define Session_SENTRY_GONE 0xdeadbeef
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struct drizzle_system_variables
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drizzle_system_variables()
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How dynamically allocated system variables are handled:
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The global_system_variables and max_system_variables are "authoritative"
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They both should have the same 'version' and 'size'.
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When attempting to access a dynamic variable, if the session version
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is out of date, then the session version is updated and realloced if
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neccessary and bytes copied from global to make up for missing data.
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ulong dynamic_variables_version;
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char * dynamic_variables_ptr;
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uint32_t dynamic_variables_head; /* largest valid variable offset */
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uint32_t dynamic_variables_size; /* how many bytes are in use */
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uint64_t myisam_max_extra_sort_file_size;
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uint64_t max_heap_table_size;
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uint64_t tmp_table_size;
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ha_rows select_limit;
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ha_rows max_join_size;
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uint64_t auto_increment_increment;
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uint64_t auto_increment_offset;
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uint64_t bulk_insert_buff_size;
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uint64_t join_buff_size;
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uint32_t max_allowed_packet;
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uint64_t max_error_count;
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uint64_t max_length_for_sort_data;
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size_t max_sort_length;
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uint64_t min_examined_row_limit;
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bool optimizer_prune_level;
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uint32_t optimizer_search_depth;
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uint32_t div_precincrement;
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uint64_t preload_buff_size;
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uint32_t read_buff_size;
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uint32_t read_rnd_buff_size;
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bool replicate_query;
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size_t sortbuff_size;
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uint32_t thread_handling;
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uint32_t tx_isolation;
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size_t transaction_message_threshold;
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uint32_t completion_type;
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/* Determines which non-standard SQL behaviour should be enabled */
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uint64_t max_seeks_for_key;
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size_t range_alloc_block_size;
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uint32_t query_alloc_block_size;
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uint32_t query_prealloc_size;
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uint64_t group_concat_max_len;
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uint64_t pseudo_thread_id;
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plugin::StorageEngine *storage_engine;
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/* Only charset part of these variables is sensible */
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const CHARSET_INFO *character_set_filesystem;
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/* Both charset and collation parts of these variables are important */
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const CHARSET_INFO *collation_server;
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inline const CHARSET_INFO *getCollation(void)
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return collation_server;
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MY_LOCALE *lc_time_names;
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Time_zone *time_zone;
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extern struct drizzle_system_variables global_system_variables;
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} /* namespace drizzled */
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#include "drizzled/sql_lex.h"
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void mark_transaction_to_rollback(Session *session, bool all);
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Storage engine specific thread local data.
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Storage engine specific thread local data.
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Lifetime: one user connection.
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* Resource contexts for both the "statement" and "normal"
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* Resource context at index 0:
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* Life time: one statement within a transaction. If @@autocommit is
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* on, also represents the entire transaction.
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* Resource context at index 1:
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* Life time: one transaction within a connection.
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* If the storage engine does not participate in a transaction,
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* there will not be a resource context.
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drizzled::ResourceContext resource_context[2];
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Ha_data() :ha_ptr(NULL) {}
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extern DRIZZLED_API struct drizzle_system_variables global_system_variables;
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* Represents a client connection to the database server.
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* all member variables that are not critical to non-internal operations of the
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* session object.
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typedef int64_t session_id_t;
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class Session : public Open_tables_state
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class DRIZZLED_API Session : public Open_tables_state
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// Plugin storage in Session.
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typedef boost::unordered_map<std::string, util::Storable *, util::insensitive_hash, util::insensitive_equal_to> PropertyMap;
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typedef Session* Ptr;
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typedef boost::shared_ptr<Session> shared_ptr;
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typedef Session& reference;
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typedef const Session& const_reference;
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typedef const Session* const_pointer;
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typedef Session* pointer;
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static shared_ptr make_shared(plugin::Client *client, catalog::Instance::shared_ptr instance_arg)
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assert(instance_arg);
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return boost::make_shared<Session>(client, instance_arg);
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MARK_COLUMNS_NONE: Means mark_used_colums is not set and no indicator to
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uint32_t file_id; /**< File ID for LOAD DATA INFILE */
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/* @note the following three members should likely move to Client */
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uint32_t max_client_packet_length; /**< Maximum number of bytes a client can send in a single packet */
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uint64_t thr_create_utime; /**< track down slow pthread_create */
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uint64_t start_utime;
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uint64_t utime_after_lock;
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boost::posix_time::ptime _epoch;
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boost::posix_time::ptime _connect_time;
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boost::posix_time::ptime _start_timer;
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boost::posix_time::ptime _end_timer;
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boost::posix_time::ptime _user_time;
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uint64_t utime_after_lock; // This used by Innodb.
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_user_time= boost::posix_time::not_a_date_time;
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const boost::posix_time::ptime &start_timer() const
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void getTimeDifference(boost::posix_time::time_duration &result_arg, const boost::posix_time::ptime &arg) const
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result_arg= arg - _start_timer;
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thr_lock_type update_lock_default;
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query_id_t query_id;
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query_id_t warn_query_id;
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void **getEngineData(const plugin::MonitoredInTransaction *monitored);
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ResourceContext *getResourceContext(const plugin::MonitoredInTransaction *monitored,
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size_t index= 0);
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* Structure used to manage "statement transactions" and
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* "normal transactions". In autocommit mode, the normal transaction is
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* equivalent to the statement transaction.
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* Storage engines will be registered here when they participate in
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* a transaction. No engine is registered more than once.
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struct st_transactions {
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std::deque<NamedSavepoint> savepoints;
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* The normal transaction (since BEGIN WORK).
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* Contains a list of all engines that have participated in any of the
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* statement transactions started within the context of the normal
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* @note In autocommit mode, this is empty.
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TransactionContext all;
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* The statment transaction.
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* Contains a list of all engines participating in the given statement.
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* @note In autocommit mode, this will be used to commit/rollback the
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* normal transaction.
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TransactionContext stmt;
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session::Transactions transaction;
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Field *dup_field;
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sigset_t signals;
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const char* enter_cond(boost::condition_variable_any &cond, boost::mutex &mutex, const char* msg);
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void exit_cond(const char* old_msg);
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inline time_t query_start() { return start_time; }
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inline void set_time()
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boost::posix_time::ptime mytime(boost::posix_time::microsec_clock::local_time());
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boost::posix_time::ptime epoch(boost::gregorian::date(1970,1,1));
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start_utime= utime_after_lock= (mytime-epoch).total_microseconds();
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start_time= user_time;
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connect_microseconds= start_utime;
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start_time= (mytime-epoch).total_seconds();
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inline void set_current_time() { start_time= time(NULL); }
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inline void set_time(time_t t)
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start_time= user_time= t;
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boost::posix_time::ptime mytime(boost::posix_time::microsec_clock::local_time());
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boost::posix_time::ptime epoch(boost::gregorian::date(1970,1,1));
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uint64_t t_mark= (mytime-epoch).total_microseconds();
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start_utime= utime_after_lock= t_mark;
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void set_time_after_lock() {
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boost::posix_time::ptime mytime(boost::posix_time::microsec_clock::local_time());
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boost::posix_time::ptime epoch(boost::gregorian::date(1970,1,1));
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utime_after_lock= (mytime-epoch).total_microseconds();
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type::Time::epoch_t query_start()
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return getCurrentTimestampEpoch();
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_end_timer= _start_timer= boost::posix_time::microsec_clock::universal_time();
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utime_after_lock= (_start_timer - _epoch).total_microseconds();
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void set_time(time_t t) // This is done by a sys_var, as long as user_time is set, we will use that for all references to time
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_user_time= boost::posix_time::from_time_t(t);
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void set_time_after_lock()
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boost::posix_time::ptime mytime(boost::posix_time::microsec_clock::universal_time());
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utime_after_lock= (mytime - _epoch).total_microseconds();
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void set_end_timer()
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_end_timer= boost::posix_time::microsec_clock::universal_time();
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status_var.execution_time_nsec+=(_end_timer - _start_timer).total_microseconds();
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uint64_t getElapsedTime() const
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return (_end_timer - _start_timer).total_microseconds();
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* Returns the current micro-timestamp
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inline uint64_t getCurrentTimestamp()
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type::Time::epoch_t getCurrentTimestamp(bool actual= true) const
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boost::posix_time::ptime mytime(boost::posix_time::microsec_clock::local_time());
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boost::posix_time::ptime epoch(boost::gregorian::date(1970,1,1));
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uint64_t t_mark= (mytime-epoch).total_microseconds();
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type::Time::epoch_t t_mark;
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boost::posix_time::ptime mytime(boost::posix_time::microsec_clock::universal_time());
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t_mark= (mytime - _epoch).total_microseconds();
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t_mark= (_end_timer - _epoch).total_microseconds();
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inline uint64_t found_rows(void)
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// We may need to set user on this
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type::Time::epoch_t getCurrentTimestampEpoch() const
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if (not _user_time.is_not_a_date_time())
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return (_user_time - _epoch).total_seconds();
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return (_start_timer - _epoch).total_seconds();
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type::Time::epoch_t getCurrentTimestampEpoch(type::Time::usec_t &fraction_arg) const
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if (not _user_time.is_not_a_date_time())
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return (_user_time - _epoch).total_seconds();
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fraction_arg= _start_timer.time_of_day().fractional_seconds() % 1000000;
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return (_start_timer - _epoch).total_seconds();
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uint64_t found_rows(void) const
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return limit_found_rows;
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/** Returns whether the session is currently inside a transaction */
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inline bool inTransaction()
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bool inTransaction() const
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return server_status & SERVER_STATUS_IN_TRANS;
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LEX_STRING *make_lex_string(LEX_STRING *lex_str,
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const char* str, uint32_t length,
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bool allocate_lex_string);
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LEX_STRING *make_lex_string(LEX_STRING *lex_str,
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const std::string &str,
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bool allocate_lex_string);
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int send_explain_fields(select_result *result);
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Clear the current error, if any.
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We do not clear is_fatal_error or is_fatal_sub_stmt_error since we
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Table *openTable(TableList *table_list, bool *refresh, uint32_t flags= 0);
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void unlink_open_table(Table *find);
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void drop_open_table(Table *table, const TableIdentifier &identifier);
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void drop_open_table(Table *table, const identifier::Table &identifier);
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void close_cached_table(Table *table);
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/* Create a lock in the cache */
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table::Placeholder *table_cache_insert_placeholder(const TableIdentifier &identifier);
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bool lock_table_name_if_not_cached(const TableIdentifier &identifier, Table **table);
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typedef boost::unordered_map<std::string, message::Table, util::insensitive_hash, util::insensitive_equal_to> TableMessageCache;
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TableMessageCache table_message_cache;
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bool storeTableMessage(const TableIdentifier &identifier, message::Table &table_message);
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bool removeTableMessage(const TableIdentifier &identifier);
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bool getTableMessage(const TableIdentifier &identifier, message::Table &table_message);
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bool doesTableMessageExist(const TableIdentifier &identifier);
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bool renameTableMessage(const TableIdentifier &from, const TableIdentifier &to);
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table::Placeholder *table_cache_insert_placeholder(const identifier::Table &identifier);
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bool lock_table_name_if_not_cached(const identifier::Table &identifier, Table **table);
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TableMessages _table_message_cache;
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session::TableMessages _table_message_cache;
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TableMessages &getMessageCache()
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session::TableMessages &getMessageCache()
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return _table_message_cache;
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/* Reopen operations */
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bool reopen_tables(bool get_locks, bool mark_share_as_old);
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bool reopen_tables();
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bool close_cached_tables(TableList *tables, bool wait_for_refresh, bool wait_for_placeholders);
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void wait_for_condition(boost::mutex &mutex, boost::condition_variable_any &cond);
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catalog::Instance::const_reference catalog() const
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return *(_catalog.get());
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catalog::Instance::reference catalog()
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return *(_catalog.get());
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catalog::Instance::shared_ptr _catalog;
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// This lives throughout the life of Session
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bool use_usage;
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PropertyMap life_properties;
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std::vector<table::Instance *> temporary_shares;
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session::PropertyMap life_properties;
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std::vector<table::Singular *> temporary_shares;
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struct rusage usage;
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#define ESCAPE_CHARS "ntrb0ZN" // keep synchronous with READ_INFO::unescape
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} /* namespace drizzled */
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/** @TODO why is this in the middle of the file */
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#include <drizzled/select_to_file.h>
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#include <drizzled/select_export.h>
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#include <drizzled/select_dump.h>
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#include <drizzled/select_insert.h>
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#include <drizzled/select_create.h>
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#include <drizzled/tmp_table_param.h>
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#include <drizzled/select_union.h>
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#include <drizzled/select_subselect.h>
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#include <drizzled/select_singlerow_subselect.h>
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#include <drizzled/select_max_min_finder_subselect.h>
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#include <drizzled/select_exists_subselect.h>
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* A structure used to describe sort information
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* for a field or item used in ORDER BY.
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Field *field; /**< Field to sort */
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Item *item; /**< Item if not sorting fields */
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size_t length; /**< Length of sort field */
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uint32_t suffix_length; /**< Length suffix (0-4) */
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Item_result result_type; /**< Type of item */
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bool reverse; /**< if descending sort */
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bool need_strxnfrm; /**< If we have to use strxnfrm() */
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result_type(STRING_RESULT),
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} /* namespace drizzled */
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/** @TODO why is this in the middle of the file */
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#include <drizzled/table_ident.h>
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#include <drizzled/user_var_entry.h>
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#include <drizzled/unique.h>
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#include <drizzled/var.h>
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#include <drizzled/select_dumpvar.h>
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/* Bits in sql_command_flags */
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enum sql_command_flag_bits