~drizzle-trunk/drizzle/development

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
/*****************************************************************************

Copyright (c) 1998, 2009, Innobase Oy. All Rights Reserved.

This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation; version 2 of the License.

This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 59 Temple
Place, Suite 330, Boston, MA 02111-1307 USA

*****************************************************************************/

/******************************************************
Executes SQL stored procedures and their control structures

Created 1/20/1998 Heikki Tuuri
*******************************************************/

#include "pars0pars.h"
#include "que0que.h"
#include "eval0eval.h"

/**************************************************************************
Performs an execution step of a procedure node. */
UNIV_INLINE
que_thr_t*
proc_step(
/*======*/
				/* out: query thread to run next or NULL */
	que_thr_t*	thr)	/* in: query thread */
{
	proc_node_t*	node;

	ut_ad(thr);

	node = thr->run_node;
	ut_ad(que_node_get_type(node) == QUE_NODE_PROC);

	if (thr->prev_node == que_node_get_parent(node)) {
		/* Start execution from the first statement in the statement
		list */

		thr->run_node = node->stat_list;
	} else {
		/* Move to the next statement */
		ut_ad(que_node_get_next(thr->prev_node) == NULL);

		thr->run_node = NULL;
	}

	if (thr->run_node == NULL) {
		thr->run_node = que_node_get_parent(node);
	}

	return(thr);
}

/**************************************************************************
Performs an execution step of a procedure call node. */
UNIV_INLINE
que_thr_t*
proc_eval_step(
/*===========*/
				/* out: query thread to run next or NULL */
	que_thr_t*	thr)	/* in: query thread */
{
	func_node_t*	node;

	ut_ad(thr);

	node = thr->run_node;
	ut_ad(que_node_get_type(node) == QUE_NODE_FUNC);

	/* Evaluate the procedure */

	eval_exp(node);

	thr->run_node = que_node_get_parent(node);

	return(thr);
}