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Save and clear run context before executing a stored function or trigger and restore it afterwards.

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This allows us to use statement replication with functions and triggers
The following things are fixed with this patch:
- NOW() and automatic timestamps takes the value from the main event for functions and triggers (which allows these to replicate with statement level logging)
- No side effects for triggers or functions with auto-increment values(), last_insert_id(), rand() or found_rows()
- Triggers can't return result sets

Fixes bugs:
#12480: NOW() is not constant in a trigger
#12481: Using NOW() in a stored function breaks statement based replication
#12482: Triggers has side effects with auto_increment values
#11587: trigger causes lost connection error
This commit is contained in:
monty@mysql.com
2005-08-15 18:15:12 +03:00
parent 4963388cc1
commit df32f7d621
15 changed files with 505 additions and 111 deletions
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34
sql/sql_class.h
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@ -1031,6 +1031,27 @@ public:
};
/* class to save context when executing a function or trigger */
/* Defines used for Sub_statement_state::in_sub_stmt */
#define SUB_STMT_TRIGGER 1
#define SUB_STMT_FUNCTION 2
class Sub_statement_state
{
public:
ulonglong options;
ulonglong last_insert_id, next_insert_id;
ulonglong limit_found_rows;
ha_rows cuted_fields, sent_row_count, examined_row_count;
ulong client_capabilities;
uint in_sub_stmt;
bool enable_slow_log, insert_id_used;
my_bool no_send_ok;
};
/*
For each client connection we create a separate thread with THD serving as
a thread/connection descriptor
@ -1137,10 +1158,9 @@ public:
time_t connect_time,thr_create_time; // track down slow pthread_create
thr_lock_type update_lock_default;
delayed_insert *di;
my_bool tablespace_op; /* This is TRUE in DISCARD/IMPORT TABLESPACE */
/* TRUE if we are inside of trigger or stored function. */
bool in_sub_stmt;
/* <> 0 if we are inside of trigger or stored function. */
uint in_sub_stmt;
/* container for handler's private per-connection data */
void *ha_data[MAX_HA];
@ -1223,6 +1243,8 @@ public:
*/
ulonglong current_insert_id;
ulonglong limit_found_rows;
ulonglong options; /* Bitmap of states */
longlong row_count_func; /* For the ROW_COUNT() function */
ha_rows cuted_fields,
sent_row_count, examined_row_count;
table_map used_tables;
@ -1246,7 +1268,6 @@ public:
update auto-updatable fields (like auto_increment and timestamp).
*/
query_id_t query_id, warn_id;
ulonglong options;
ulong thread_id, col_access;
/* Statement id is thread-wide. This counter is used to generate ids */
@ -1287,7 +1308,8 @@ public:
bool no_warnings_for_error; /* no warnings on call to my_error() */
/* set during loop of derived table processing */
bool derived_tables_processing;
longlong row_count_func; /* For the ROW_COUNT() function */
my_bool tablespace_op; /* This is TRUE in DISCARD/IMPORT TABLESPACE */
sp_rcontext *spcont; // SP runtime context
sp_cache *sp_proc_cache;
sp_cache *sp_func_cache;
@ -1495,6 +1517,8 @@ public:
{ return current_arena->is_stmt_prepare() || lex->view_prepare_mode; }
void reset_n_backup_open_tables_state(Open_tables_state *backup);
void restore_backup_open_tables_state(Open_tables_state *backup);
void reset_sub_statement_state(Sub_statement_state *backup, uint new_state);
void restore_sub_statement_state(Sub_statement_state *backup);
};