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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 <sys/resource.h>
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#include <algorithm>
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#include <boost/make_shared.hpp>
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#include <boost/scoped_ptr.hpp>
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#include <boost/thread/condition_variable.hpp>
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#include <boost/thread/mutex.hpp>
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#include <boost/thread/shared_mutex.hpp>
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#include <boost/thread/thread.hpp>
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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 <boost/unordered_map.hpp>
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#include <boost/thread/thread.hpp>
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#include <boost/thread/mutex.hpp>
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#include <boost/thread/shared_mutex.hpp>
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#include <boost/thread/condition_variable.hpp>
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#include <boost/make_shared.hpp>
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#define MIN_HANDSHAKE_SIZE 6
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class EventObserverList;
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struct st_my_thread_var;
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class Lex_input_stream;
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class TableShareInstance;
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#include <sys/resource.h>
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#include <drizzled/global_charset_info.h>
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#include <drizzled/base.h>
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#include <drizzled/error.h>
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#include <drizzled/open_tables_state.h>
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#include <drizzled/pthread_globals.h>
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#include <drizzled/sql_error.h>
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#include <drizzled/sql_locale.h>
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#include <drizzled/visibility.h>
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#include <drizzled/util/find_ptr.h>
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#include <drizzled/util/string.h>
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#include <drizzled/type/time.h>
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extern char internal_table_name[2];
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extern char empty_c_string[1];
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extern const char **errmesg;
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extern uint32_t server_id;
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#define TC_HEURISTIC_RECOVER_COMMIT 1
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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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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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utime_after_lock= (boost::posix_time::microsec_clock::universal_time() - _epoch).total_microseconds();
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void set_end_timer();
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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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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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inline uint64_t found_rows(void)
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type::Time::epoch_t getCurrentTimestamp(bool actual= true) const
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return ((actual ? boost::posix_time::microsec_clock::universal_time() : _end_timer) - _epoch).total_microseconds();
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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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return ((_user_time.is_not_a_date_time() ? _start_timer : _user_time) - _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() 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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assume this is never called if the fatal error is set.
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@todo: To silence an error, one should use Internal_error_handler
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mechanism. In future this function will be removed.
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inline void clear_error(bool full= false)
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if (main_da.is_error())
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main_da.reset_diagnostics_area();
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drizzle_reset_errors(this, true);
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void clearDiagnostics()
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main_da.reset_diagnostics_area();
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Mark the current error as fatal. Warning: this does not
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set any error, it sets a property of the error, so must be
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followed or prefixed with my_error().
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inline void fatal_error()
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assert(main_da.is_error());
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is_fatal_error= true;
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true if there is an error in the error stack.
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Please use this method instead of direct access to
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If true, the current (sub)-statement should be aborted.
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The main difference between this member and is_fatal_error
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is that a fatal error can not be handled by a stored
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procedure continue handler, whereas a normal error can.
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To raise this flag, use my_error().
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inline bool is_error() const { return main_da.is_error(); }
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inline const CHARSET_INFO *charset() { return default_charset_info; }
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void change_item_tree(Item **place, Item *new_value)
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void clear_error(bool full= false);
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void clearDiagnostics();
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bool is_error() const;
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inline const charset_info_st *charset() { return default_charset_info; }
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Cleanup statement parse state (parse tree, lex) and execution
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state after execution of a non-prepared SQL statement.
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void resetResultsetMessage()
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resultset= NULL;
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/** Pointers to memory managed by the ReplicationServices component */
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message::Transaction *transaction_message;
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message::Statement *statement_message;
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/* Pointer to the current resultset of Select query */
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message::Resultset *resultset;
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plugin::EventObserverList *session_event_observers;
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/* Schema observers are mapped to databases. */
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std::map<std::string, plugin::EventObserverList *> schema_event_observers;
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plugin::EventObserverList *getSessionObservers()
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plugin::EventObserverList *getSessionObservers()
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return session_event_observers;
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void setSessionObservers(plugin::EventObserverList *observers)
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void setSessionObservers(plugin::EventObserverList *observers)
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session_event_observers= observers;
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/* For schema event observers there is one set of observers per database. */
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plugin::EventObserverList *getSchemaObservers(const std::string &db_name)
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std::map<std::string, plugin::EventObserverList *>::iterator it;
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it= schema_event_observers.find(db_name);
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if (it == schema_event_observers.end())
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void setSchemaObservers(const std::string &db_name, plugin::EventObserverList *observers)
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std::map<std::string, plugin::EventObserverList *>::iterator it;
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it= schema_event_observers.find(db_name);
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if (it != schema_event_observers.end())
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schema_event_observers.erase(it);;
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schema_event_observers[db_name] = observers;
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plugin::EventObserverList* getSchemaObservers(const std::string& schema);
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plugin::EventObserverList* setSchemaObservers(const std::string& schema, plugin::EventObserverList*);
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/** Microsecond timestamp of when Session connected */
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uint64_t connect_microseconds;
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const char *proc_info;
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/** The current internal error handler for this thread, or NULL. */
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Internal_error_handler *m_internal_handler;
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The lex to hold the parsed tree of conventional (non-prepared) queries.
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Whereas for prepared and stored procedure statements we use an own lex
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instance for each new query, for conventional statements we reuse
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the same lex. (@see mysql_parse for details).
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This memory root is used for two purposes:
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- for conventional queries, to allocate structures stored in main_lex
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during parsing, and allocate runtime data (execution plan, etc.)
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* if table->query_id != session->query_id to know if a table is in use.
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* SELECT f1_that_uses_t1() FROM t1;
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* In f1_that_uses_t1() we will see one instance of t1 where query_id is
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* set to query_id of original query.
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void mark_used_tables_as_free_for_reuse(Table *table);
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/** A short cut for session->main_da.set_ok_status(). */
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inline void my_ok(ha_rows affected_rows= 0, ha_rows found_rows_arg= 0,
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uint64_t passed_id= 0, const char *message= NULL)
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main_da.set_ok_status(this, affected_rows, found_rows_arg, passed_id, message);
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/** A short cut for session->main_da.set_eof_status(). */
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inline void my_eof()
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main_da.set_eof_status(this);
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/* Some inline functions for more speed */
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inline bool add_item_to_list(Item *item)
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return lex->current_select->add_item_to_list(this, item);
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inline bool add_value_to_list(Item *value)
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return lex->value_list.push_back(value);
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inline bool add_order_to_list(Item *item, bool asc)
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return lex->current_select->add_order_to_list(this, item, asc);
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inline bool add_group_to_list(Item *item, bool asc)
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return lex->current_select->add_group_to_list(this, item, asc);
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void my_ok(ha_rows affected_rows= 0, ha_rows found_rows_arg= 0, uint64_t passed_id= 0, const char *message= NULL);
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bool add_item_to_list(Item *item);
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bool add_value_to_list(Item *value);
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bool add_order_to_list(Item *item, bool asc);
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bool add_group_to_list(Item *item, bool asc);
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void refresh_status();
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user_var_entry *getVariable(LEX_STRING &name, bool create_if_not_exists);
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user_var_entry *getVariable(const std::string &name, bool create_if_not_exists);
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void setVariable(const std::string &name, const std::string &value);
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* Closes all tables used by the current substatement, or all tables
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* used by this thread if we are on the upper level.
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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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TableMessages _table_message_cache;
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TableMessages &getMessageCache()
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return _table_message_cache;
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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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session::TableMessages &getMessageCache();
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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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int setup_conds(TableList *leaves, COND **conds);
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int lock_tables(TableList *tables, uint32_t count, bool *need_reopen);
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drizzled::util::Storable *getProperty(const std::string &arg)
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T* getProperty(const std::string& name)
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return life_properties[arg];
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return static_cast<T*>(getProperty0(name));
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bool setProperty(const std::string &arg, T *value)
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T setProperty(const std::string& name, T value)
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life_properties[arg]= value;
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setProperty0(name, value);
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pointer to plugin::StorageEngine
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plugin::StorageEngine *getDefaultStorageEngine()
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if (variables.storage_engine)
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return variables.storage_engine;
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return global_system_variables.storage_engine;
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void get_xid(DRIZZLE_XID *xid); // Innodb only
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table::Instance *getInstanceTable();
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table::Instance *getInstanceTable(List<CreateField> &field_list);
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if (getrusage(RUSAGE_THREAD, &usage))
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plugin::StorageEngine *getDefaultStorageEngine();
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void get_xid(DrizzleXid *xid); // Innodb only
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table::Singular& getInstanceTable();
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table::Singular& getInstanceTable(std::list<CreateField>&);
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void setUsage(bool arg)
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use_usage= arg;
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const struct rusage &getUsage()
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const rusage &getUsage()
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const catalog::Instance& catalog() const
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catalog::Instance& catalog()
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bool arg_of_last_insert_id_function; // Tells if LAST_INSERT_ID(#) was called for the current statement
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// This lives throughout the life of Session
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bool free_cached_table(boost::mutex::scoped_lock &scopedLock);
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drizzled::util::Storable* getProperty0(const std::string&);
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void setProperty0(const std::string&, drizzled::util::Storable*);
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return not getrusage(RUSAGE_THREAD, &usage);
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boost::shared_ptr<catalog::Instance> _catalog;
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/** Pointers to memory managed by the ReplicationServices component */
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message::Transaction *transaction_message;
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message::Statement *statement_message;
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/* Pointer to the current resultset of Select query */
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message::Resultset *resultset;
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plugin::EventObserverList *session_event_observers;
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const char *proc_info;
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bool abort_on_warning;
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bool concurrent_execute_allowed;
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bool tablespace_op; /**< This is true in DISCARD/IMPORT TABLESPACE */
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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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struct rusage usage;
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identifier::User::shared_ptr security_ctx;
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int32_t scoreboard_index;
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plugin::Client *client;
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util::string::shared_ptr _schema;
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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 */
1819
#include <drizzled/select_to_file.h>
1820
#include <drizzled/select_export.h>
1821
#include <drizzled/select_dump.h>
1822
#include <drizzled/select_insert.h>
1823
#include <drizzled/select_create.h>
1824
#include <drizzled/tmp_table_param.h>
1825
#include <drizzled/select_union.h>
1826
#include <drizzled/select_subselect.h>
1827
#include <drizzled/select_singlerow_subselect.h>
1828
#include <drizzled/select_max_min_finder_subselect.h>
1829
#include <drizzled/select_exists_subselect.h>
1835
* A structure used to describe sort information
1836
* for a field or item used in ORDER BY.
1841
Field *field; /**< Field to sort */
1842
Item *item; /**< Item if not sorting fields */
1843
size_t length; /**< Length of sort field */
1844
uint32_t suffix_length; /**< Length suffix (0-4) */
1845
Item_result result_type; /**< Type of item */
1846
bool reverse; /**< if descending sort */
1847
bool need_strxnfrm; /**< If we have to use strxnfrm() */
1854
result_type(STRING_RESULT),
1861
} /* namespace drizzled */
1863
/** @TODO why is this in the middle of the file */
1865
#include <drizzled/table_ident.h>
1866
#include <drizzled/user_var_entry.h>
1867
#include <drizzled/unique.h>
1868
#include <drizzled/var.h>
1869
#include <drizzled/select_dumpvar.h>
1874
1381
/* Bits in sql_command_flags */
1876
enum sql_command_flag_bits
1383
enum sql_command_flag_bits
1878
1385
CF_BIT_CHANGES_DATA,
1879
1386
CF_BIT_HAS_ROW_COUNT,