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Bug#26518 XPath and variables problem 

Problem: XPath variables didn't work.
Fix: adding variables support,
both user-defined and sp local variables are now supported by XPath.


mysql-test/r/xml.result:
  Adding test case
mysql-test/t/xml.test:
  Adding test case
sql/item_xmlfunc.cc:
  Adding variables support:
  - SP variables with standard XPath syntax:  $i
  - User variables with non-standard syntax:  $@i
parent dc5f8fec
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Showing with 253 additions and 9 deletions
mysql-test/r/xml.result
View file @ cf78188c
......@@ -884,3 +884,118 @@ test
select ExtractValue('<a><self>test</self></a>', '/a/self');
ExtractValue('<a><self>test</self></a>', '/a/self')
test
set @i=1;
select ExtractValue('<a><b>b1</b><b>b2</b></a>','/a/b[$@i]');
ExtractValue('<a><b>b1</b><b>b2</b></a>','/a/b[$@i]')
b1
set @i=2;
select ExtractValue('<a><b>b1</b><b>b2</b></a>','/a/b[$@i]');
ExtractValue('<a><b>b1</b><b>b2</b></a>','/a/b[$@i]')
b2
set @i=NULL;
select ExtractValue('<a><b>b1</b><b>b2</b></a>','/a/b[$@i]');
ExtractValue('<a><b>b1</b><b>b2</b></a>','/a/b[$@i]')
CREATE PROCEDURE spxml(xml VARCHAR(128))
BEGIN
DECLARE c INT;
DECLARE i INT DEFAULT 1;
SET c= ExtractValue(xml,'count(/a/b)');
SET @i= c;
WHILE i <= c DO
BEGIN
SELECT i, @i, ExtractValue(xml,'/a/b[$i]'), ExtractValue(xml,'/a/b[$@i]');
SET i= i + 1;
SET @i= @i - 1;
END;
END WHILE;
END|
call spxml('<a><b>b1</b><b>b2</b><b>b3</b></a>');
i @i ExtractValue(xml,'/a/b[$i]') ExtractValue(xml,'/a/b[$@i]')
1 3 b1 b3
i @i ExtractValue(xml,'/a/b[$i]') ExtractValue(xml,'/a/b[$@i]')
2 2 b2 b2
i @i ExtractValue(xml,'/a/b[$i]') ExtractValue(xml,'/a/b[$@i]')
3 1 b3 b1
drop procedure spxml;
Multiple matches, but no index specification
SELECT ExtractValue('<a><b>b1</b><b>b2</b></a>','/a/b');
ExtractValue('<a><b>b1</b><b>b2</b></a>','/a/b')
b1 b2
No matches
SELECT ExtractValue('<a><b>b1</b><b>b2</b></a>','/a/c');
ExtractValue('<a><b>b1</b><b>b2</b></a>','/a/c')
Index out of range
SELECT ExtractValue('<a><b>b1</b><b>b2</b></a>','/a/b[-1]');
ExtractValue('<a><b>b1</b><b>b2</b></a>','/a/b[-1]')
SELECT ExtractValue('<a><b>b1</b><b>b2</b></a>','/a/b[10]');
ExtractValue('<a><b>b1</b><b>b2</b></a>','/a/b[10]')
With string-to-number conversion
SELECT ExtractValue('<a><b>b1</b><b>b2</b></a>','/a/b["1"]');
ExtractValue('<a><b>b1</b><b>b2</b></a>','/a/b["1"]')
b1
SELECT ExtractValue('<a><b>b1</b><b>b2</b></a>','/a/b["1 and string"]');
ExtractValue('<a><b>b1</b><b>b2</b></a>','/a/b["1 and string"]')
b1
Warnings:
Warning 1292 Truncated incorrect INTEGER value: '1 and string"]'
Warning 1292 Truncated incorrect INTEGER value: '1 and string"]'
SELECT ExtractValue('<a><b>b1</b><b>b2</b></a>','/a/b["string and 1"]');
ExtractValue('<a><b>b1</b><b>b2</b></a>','/a/b["string and 1"]')
Warnings:
Warning 1292 Truncated incorrect INTEGER value: 'string and 1"]'
Warning 1292 Truncated incorrect INTEGER value: 'string and 1"]'
SELECT ExtractValue('<a><b>b1</b><b>b2</b></a>','/a/b["string"]');
ExtractValue('<a><b>b1</b><b>b2</b></a>','/a/b["string"]')
Warnings:
Warning 1292 Truncated incorrect INTEGER value: 'string"]'
Warning 1292 Truncated incorrect INTEGER value: 'string"]'
String-to-number conversion from a user variable
SET @i='1';
SELECT ExtractValue('<a><b>b1</b><b>b2</b></a>','/a/b[$@i]');
ExtractValue('<a><b>b1</b><b>b2</b></a>','/a/b[$@i]')
b1
SET @i='1 and string';
SELECT ExtractValue('<a><b>b1</b><b>b2</b></a>','/a/b[$@i]');
ExtractValue('<a><b>b1</b><b>b2</b></a>','/a/b[$@i]')
b1
SET @i='string and 1';
SELECT ExtractValue('<a><b>b1</b><b>b2</b></a>','/a/b[$@i]');
ExtractValue('<a><b>b1</b><b>b2</b></a>','/a/b[$@i]')
SET @i='string';
SELECT ExtractValue('<a><b>b1</b><b>b2</b></a>','/a/b[$@i]');
ExtractValue('<a><b>b1</b><b>b2</b></a>','/a/b[$@i]')
String-to-number conversion with a CHAR SP variable
CREATE PROCEDURE spxml(xml VARCHAR(128), i CHAR(16))
BEGIN
SELECT ExtractValue(xml,'/a/b[$i]');
END|
CALL spxml('<a><b>b1</b><b>b2</b></a>', '1');
ExtractValue(xml,'/a/b[$i]')
b1
CALL spxml('<a><b>b1</b><b>b2</b></a>', '1 and string');
ExtractValue(xml,'/a/b[$i]')
b1
Warnings:
Warning 1292 Truncated incorrect INTEGER value: '1 and string '
Warning 1292 Truncated incorrect INTEGER value: '1 and string '
CALL spxml('<a><b>b1</b><b>b2</b></a>', 'string and 1');
ExtractValue(xml,'/a/b[$i]')
Warnings:
Warning 1292 Truncated incorrect INTEGER value: 'string and 1 '
Warning 1292 Truncated incorrect INTEGER value: 'string and 1 '
CALL spxml('<a><b>b1</b><b>b2</b></a>', 'string');
ExtractValue(xml,'/a/b[$i]')
Warnings:
Warning 1292 Truncated incorrect INTEGER value: 'string '
Warning 1292 Truncated incorrect INTEGER value: 'string '
DROP PROCEDURE spxml;
mysql-test/t/xml.test
View file @ cf78188c
......@@ -444,3 +444,75 @@ select ExtractValue('<a><parent>test</parent></a>', '/a/parent');
select ExtractValue('<a><preceding>test</preceding></a>', '/a/preceding');
select ExtractValue('<a><preceding-sibling>test</preceding-sibling></a>', '/a/preceding-sibling');
select ExtractValue('<a><self>test</self></a>', '/a/self');
#
# Bug#26518 XPath and variables problem
# Check with user defined variables
#
set @i=1;
select ExtractValue('<a><b>b1</b><b>b2</b></a>','/a/b[$@i]');
set @i=2;
select ExtractValue('<a><b>b1</b><b>b2</b></a>','/a/b[$@i]');
set @i=NULL;
select ExtractValue('<a><b>b1</b><b>b2</b></a>','/a/b[$@i]');
#
# Check variables in a stored procedure - both local and user variables
# Make sure that SP and local variables with the same name work together.
#
DELIMITER |;
CREATE PROCEDURE spxml(xml VARCHAR(128))
BEGIN
DECLARE c INT;
DECLARE i INT DEFAULT 1;
SET c= ExtractValue(xml,'count(/a/b)');
SET @i= c;
WHILE i <= c DO
BEGIN
SELECT i, @i, ExtractValue(xml,'/a/b[$i]'), ExtractValue(xml,'/a/b[$@i]');
SET i= i + 1;
SET @i= @i - 1;
END;
END WHILE;
END|
DELIMITER ;|
call spxml('<a><b>b1</b><b>b2</b><b>b3</b></a>');
drop procedure spxml;
#
# Additional tests for bug#26518
--echo Multiple matches, but no index specification
SELECT ExtractValue('<a><b>b1</b><b>b2</b></a>','/a/b');
--echo No matches
SELECT ExtractValue('<a><b>b1</b><b>b2</b></a>','/a/c');
--echo Index out of range
SELECT ExtractValue('<a><b>b1</b><b>b2</b></a>','/a/b[-1]');
SELECT ExtractValue('<a><b>b1</b><b>b2</b></a>','/a/b[10]');
--echo With string-to-number conversion
SELECT ExtractValue('<a><b>b1</b><b>b2</b></a>','/a/b["1"]');
SELECT ExtractValue('<a><b>b1</b><b>b2</b></a>','/a/b["1 and string"]');
SELECT ExtractValue('<a><b>b1</b><b>b2</b></a>','/a/b["string and 1"]');
SELECT ExtractValue('<a><b>b1</b><b>b2</b></a>','/a/b["string"]');
--echo String-to-number conversion from a user variable
SET @i='1';
SELECT ExtractValue('<a><b>b1</b><b>b2</b></a>','/a/b[$@i]');
SET @i='1 and string';
SELECT ExtractValue('<a><b>b1</b><b>b2</b></a>','/a/b[$@i]');
SET @i='string and 1';
SELECT ExtractValue('<a><b>b1</b><b>b2</b></a>','/a/b[$@i]');
SET @i='string';
SELECT ExtractValue('<a><b>b1</b><b>b2</b></a>','/a/b[$@i]');
--echo String-to-number conversion with a CHAR SP variable
DELIMITER |;
CREATE PROCEDURE spxml(xml VARCHAR(128), i CHAR(16))
BEGIN
SELECT ExtractValue(xml,'/a/b[$i]');
END|
DELIMITER ;|
CALL spxml('<a><b>b1</b><b>b2</b></a>', '1');
CALL spxml('<a><b>b1</b><b>b2</b></a>', '1 and string');
CALL spxml('<a><b>b1</b><b>b2</b></a>', 'string and 1');
CALL spxml('<a><b>b1</b><b>b2</b></a>', 'string');
DROP PROCEDURE spxml;
sql/item_xmlfunc.cc
View file @ cf78188c
......@@ -19,7 +19,7 @@
#include "mysql_priv.h"
#include "my_xml.h"
#include "sp_pcontext.h"
/*
TODO: future development directions:
......@@ -2412,21 +2412,78 @@ my_xpath_parse_QName(MY_XPATH *xpath)
}
/*
/**
Scan Variable reference
SYNOPSYS
@details Implements parsing of two syntax structures:
[36] VariableReference ::= '$' QName
RETURN
1 - success
0 - failure
1. Standard XPath syntax [36], for SP variables:
VariableReference ::= '$' QName
Finds a SP variable with the given name.
If outside of a SP context, or variable with
the given name doesn't exists, then error is returned.
2. Non-standard syntax - MySQL extension for user variables:
VariableReference ::= '$' '@' QName
Item, corresponding to the variable, is returned
in xpath->item in both cases.
@param xpath pointer to XPath structure
@return Operation status
@retval 1 Success
@retval 0 Failure
*/
static int
my_xpath_parse_VariableReference(MY_XPATH *xpath)
{
return my_xpath_parse_term(xpath, MY_XPATH_LEX_DOLLAR) &&
my_xpath_parse_term(xpath, MY_XPATH_LEX_IDENT);
LEX_STRING name;
int user_var;
const char *dollar_pos;
if (!my_xpath_parse_term(xpath, MY_XPATH_LEX_DOLLAR) ||
(!(dollar_pos= xpath->prevtok.beg)) ||
(!((user_var= my_xpath_parse_term(xpath, MY_XPATH_LEX_AT) &&
my_xpath_parse_term(xpath, MY_XPATH_LEX_IDENT))) &&
!my_xpath_parse_term(xpath, MY_XPATH_LEX_IDENT)))
return 0;
name.length= xpath->prevtok.end - xpath->prevtok.beg;
name.str= (char*) xpath->prevtok.beg;
if (user_var)
xpath->item= new Item_func_get_user_var(name);
else
{
sp_variable_t *spv;
sp_pcontext *spc;
LEX *lex;
if ((lex= current_thd->lex) &&
(spc= lex->spcont) &&
(spv= spc->find_variable(&name)))
{
Item_splocal *splocal= new Item_splocal(name, spv->offset, spv->type, 0);
#ifndef DBUG_OFF
if (splocal)
splocal->m_sp= lex->sphead;
#endif
xpath->item= (Item*) splocal;
}
else
{
xpath->item= NULL;
DBUG_ASSERT(xpath->query.end > dollar_pos);
uint len= xpath->query.end - dollar_pos;
set_if_smaller(len, 32);
my_printf_error(ER_UNKNOWN_ERROR, "Unknown XPATH variable at: '%.*s'",
MYF(0), len, dollar_pos);
}
}
return xpath->item ? 1 : 0;
}
......
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