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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/sql_class.cc
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@ -551,11 +551,6 @@ void THD::cleanup_after_query()
}
/* Free Items that were created during this execution */
free_items();
/*
In the rest of code we assume that free_list never points to garbage:
Keep this predicate true.
*/
free_list= 0;
}
/*
@ -1686,23 +1681,17 @@ Statement_map::Statement_map() :
NULL,MYF(0));
}
int Statement_map::insert(Statement *statement)
{
int rc= my_hash_insert(&st_hash, (byte *) statement);
if (rc == 0)
last_found_statement= statement;
if (statement->name.str)
{
/*
If there is a statement with the same name, remove it. It is ok to
remove old and fail to insert new one at the same time.
*/
Statement *old_stmt;
if ((old_stmt= find_by_name(&statement->name)))
erase(old_stmt);
if ((rc= my_hash_insert(&names_hash, (byte*)statement)))
hash_delete(&st_hash, (byte*)statement);
}
if (rc == 0)
last_found_statement= statement;
return rc;
}