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Implement WL#2661 "Prepared Statements: Dynamic SQL in Stored Procedures".

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The idea of the patch is to separate statement processing logic,
such as parsing, validation of the parsed tree, execution and cleanup, 
from global query processing logic, such as logging, resetting
priorities of a thread, resetting stored procedure cache, resetting
thread count of errors and warnings.
This makes PREPARE and EXECUTE behave similarly to the rest of SQL
statements and allows their use in stored procedures.
This patch contains a change in behaviour:
until recently for each SQL prepared statement command, 2 queries
were written to the general log, e.g.
[Query]   prepare stmt from @stmt_text;
[Prepare] select * from t1 <-- contents of @stmt_text
The chagne was necessary to prevent [Prepare] commands from being written
to the general log when executing a stored procedure with Dynamic SQL.
We should consider whether the old behavior is preferrable and probably
restore it.
This patch refixes Bug#7115, Bug#10975 (partially), Bug#10605 (various bugs
in Dynamic SQL reported before it was disabled).
This commit is contained in:
konstantin@mysql.com
2005-09-03 03:13:18 +04:00
parent a3ddcdf8fb
commit 38486e83c1
19 changed files with 1679 additions and 700 deletions
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17
sql/mysql_priv.h
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@ -589,7 +589,7 @@ bool mysql_change_db(THD *thd,const char *name,bool no_access_check);
void mysql_parse(THD *thd,char *inBuf,uint length);
bool mysql_test_parse_for_slave(THD *thd,char *inBuf,uint length);
bool is_update_query(enum enum_sql_command command);
bool alloc_query(THD *thd, char *packet, ulong packet_length);
bool alloc_query(THD *thd, const char *packet, uint packet_length);
void mysql_init_select(LEX *lex);
void mysql_reset_thd_for_next_command(THD *thd);
void mysql_init_query(THD *thd, uchar *buf, uint length);
@ -848,16 +848,17 @@ int fill_schema_column_privileges(THD *thd, TABLE_LIST *tables, COND *cond);
bool get_schema_tables_result(JOIN *join);
/* sql_prepare.cc */
bool mysql_stmt_prepare(THD *thd, char *packet, uint packet_length,
LEX_STRING *name);
void mysql_stmt_prepare(THD *thd, const char *packet, uint packet_length);
void mysql_stmt_execute(THD *thd, char *packet, uint packet_length);
void mysql_sql_stmt_execute(THD *thd, LEX_STRING *stmt_name);
void mysql_stmt_fetch(THD *thd, char *packet, uint packet_length);
void mysql_stmt_close(THD *thd, char *packet);
void mysql_sql_stmt_prepare(THD *thd);
void mysql_sql_stmt_execute(THD *thd);
void mysql_sql_stmt_close(THD *thd);
void mysql_stmt_fetch(THD *thd, char *packet, uint packet_length);
void mysql_stmt_reset(THD *thd, char *packet);
void mysql_stmt_get_longdata(THD *thd, char *pos, ulong packet_length);
void reinit_stmt_before_use(THD *thd, LEX *lex);
void init_stmt_after_parse(THD*, LEX*);
/* sql_handler.cc */
bool mysql_ha_open(THD *thd, TABLE_LIST *tables, bool reopen);
@ -1361,8 +1362,8 @@ extern int sql_cache_hit(THD *thd, char *inBuf, uint length);
/* item_func.cc */
Item *get_system_var(THD *thd, enum_var_type var_type, LEX_STRING name,
LEX_STRING component);
int get_var_with_binlog(THD *thd, LEX_STRING &name,
user_var_entry **out_entry);
int get_var_with_binlog(THD *thd, enum_sql_command sql_command,
LEX_STRING &name, user_var_entry **out_entry);
/* log.cc */
bool flush_error_log(void);