Adding XPath support: ExtractValue and UpdateXML functions.

libmysqld/Makefile.am:
sql/Makefile.am:
  Adding new source files.
  Adding new file into build process.
include/my_xml.h:
strings/xml.c:
  Adding new XML parse flags to skip text normalization and 
  to use relative tag names. Adding enum for XML token types.
sql/lex.h:
  Making parser aware of new SQL functions.
sqll/item_create.h, sql/item_create.cc:
  Adding creators for ExtractValue and UpdateXML.
sql/item.h:
  Adding new Item types: nodeset and nodeset comparator.
sql/item_xmlfunc.h
sql/item_xmlfunc.cc
  Adding new classes implementing XPath functions.
mysql-test/t/xml.test, mysql-test/r/xml.result:
  New files: adding test case


include/my_xml.h:
  Adding ExtractValue and UpdateXML functions.
  Adding XML parser flags and enum for XML token types.
sql/Makefile.am:
  Adding new source files.
sql/item.h:
  Adding new Item types: nodeset and nodeset comparator.
sql/item_create.cc:
  Adding creators for ExtractValue and UpdateXML.
sql/item_create.h:
  Adding creators for ExtractValue and UpdateXML.
sql/lex.h:
  Make parse aware of new SQL functions.
strings/xml.c:
  Adding new flags to skip text normalization and 
  to use relative tag names.
libmysqld/Makefile.am:
  Adding new file into build process.

1 files changed, 522 insertions, 0 deletions

diff --git a/mysql-test/r/xml.result b/mysql-test/r/xml.result
new file mode 100644
index 00000000000..693dd6eea81
--- /dev/null
+++ b/mysql-test/r/xml.result
@@ -0,0 +1,522 @@
+SET @xml='<a aa1="aa1" aa2="aa2">a1<b ba1="ba1">b1<c>c1</c>b2</b>a2</a>';
+SELECT extractValue(@xml,'/a');
+extractValue(@xml,'/a')
+a1 a2
+SELECT extractValue(@xml,'/a/b');
+extractValue(@xml,'/a/b')
+b1 b2
+SELECT extractValue(@xml,'/a/b/c');
+extractValue(@xml,'/a/b/c')
+c1
+SELECT extractValue(@xml,'/a/@aa1');
+extractValue(@xml,'/a/@aa1')
+aa1
+SELECT extractValue(@xml,'/a/@aa2');
+extractValue(@xml,'/a/@aa2')
+aa2
+SELECT extractValue(@xml,'/a/@*');
+extractValue(@xml,'/a/@*')
+aa1 aa2
+SELECT extractValue(@xml,'//@ba1');
+extractValue(@xml,'//@ba1')
+ba1
+SELECT extractValue(@xml,'//a');
+extractValue(@xml,'//a')
+a1 a2
+SELECT extractValue(@xml,'//b');
+extractValue(@xml,'//b')
+b1 b2
+SELECT extractValue(@xml,'//c');
+extractValue(@xml,'//c')
+c1
+SELECT extractValue(@xml,'/a//b');
+extractValue(@xml,'/a//b')
+b1 b2
+SELECT extractValue(@xml,'/a//c');
+extractValue(@xml,'/a//c')
+c1
+SELECT extractValue(@xml,'//*');
+extractValue(@xml,'//*')
+a1 b1 c1 b2 a2
+SELECT extractValue(@xml,'/a//*');
+extractValue(@xml,'/a//*')
+b1 c1 b2
+SELECT extractValue(@xml,'/./a');
+extractValue(@xml,'/./a')
+a1 a2
+SELECT extractValue(@xml,'/a/b/.');
+extractValue(@xml,'/a/b/.')
+b1 b2
+SELECT extractValue(@xml,'/a/b/..');
+extractValue(@xml,'/a/b/..')
+a1 a2
+SELECT extractValue(@xml,'/a/b/../@aa1');
+extractValue(@xml,'/a/b/../@aa1')
+aa1
+SELECT extractValue(@xml,'/*');
+extractValue(@xml,'/*')
+a1 a2
+SELECT extractValue(@xml,'/*/*');
+extractValue(@xml,'/*/*')
+b1 b2
+SELECT extractValue(@xml,'/*/*/*');
+extractValue(@xml,'/*/*/*')
+c1
+SELECT extractValue(@xml,'/a/child::*');
+extractValue(@xml,'/a/child::*')
+b1 b2
+SELECT extractValue(@xml,'/a/descendant::*');
+extractValue(@xml,'/a/descendant::*')
+b1 c1 b2
+SELECT extractValue(@xml,'/a/descendant-or-self::*');
+extractValue(@xml,'/a/descendant-or-self::*')
+a1 b1 c1 b2 a2
+SELECT extractValue(@xml,'/a/attribute::*');
+extractValue(@xml,'/a/attribute::*')
+aa1 aa2
+SELECT extractValue(@xml,'/a/b/c/parent::*');
+extractValue(@xml,'/a/b/c/parent::*')
+b1 b2
+SELECT extractValue(@xml,'/a/b/c/ancestor::*');
+extractValue(@xml,'/a/b/c/ancestor::*')
+a1 b1 b2 a2
+SELECT extractValue(@xml,'/a/b/c/ancestor-or-self::*');
+extractValue(@xml,'/a/b/c/ancestor-or-self::*')
+a1 b1 c1 b2 a2
+SELECT extractValue(@xml,'/descendant-or-self::*');
+extractValue(@xml,'/descendant-or-self::*')
+a1 b1 c1 b2 a2
+SET @xml='<a>a11<b ba="ba11" ba="ba12">b11</b><b ba="ba21" ba="ba22">b21<c>c1</c>b22</b>a12</a>';
+SELECT extractValue(@xml,'/a/b/c/ancestor-or-self::*');
+extractValue(@xml,'/a/b/c/ancestor-or-self::*')
+a11 b21 c1 b22 a12
+SELECT extractValue(@xml,'//@ba');
+extractValue(@xml,'//@ba')
+ba11 ba12 ba21 ba22
+SET @xml='<a><b>b</b><c>c</c></a>';
+SELECT extractValue(@xml,'/a/b');
+extractValue(@xml,'/a/b')
+b
+SELECT extractValue(@xml,'/a/c');
+extractValue(@xml,'/a/c')
+c
+SELECT extractValue(@xml,'/a/child::b');
+extractValue(@xml,'/a/child::b')
+b
+SELECT extractValue(@xml,'/a/child::c');
+extractValue(@xml,'/a/child::c')
+c
+SET @xml='<a><b>b1</b><c>c1</c><b>b2</b><c>c2</c></a>';
+SELECT extractValue(@xml,'/a/b[1]');
+extractValue(@xml,'/a/b[1]')
+b1
+SELECT extractValue(@xml,'/a/b[2]');
+extractValue(@xml,'/a/b[2]')
+b2
+SELECT extractValue(@xml,'/a/c[1]');
+extractValue(@xml,'/a/c[1]')
+c1
+SELECT extractValue(@xml,'/a/c[2]');
+extractValue(@xml,'/a/c[2]')
+c2
+SET @xml='<a><b x="xb1" x="xb2"/><c x="xc1" x="xc2"/></a>';
+SELECT extractValue(@xml,'/a//@x');
+extractValue(@xml,'/a//@x')
+xb1 xb2 xc1 xc2
+SELECT extractValue(@xml,'/a//@x[1]');
+extractValue(@xml,'/a//@x[1]')
+xb1 xc1
+SELECT extractValue(@xml,'/a//@x[2]');
+extractValue(@xml,'/a//@x[2]')
+xb2 xc2
+SET @xml='<a><b>b1</b><b>b2</b><c><b>c1b1</b><b>c1b2</b></c><c><b>c2b1</c></b>/a>';
+SELECT extractValue(@xml,'//b[1]');
+extractValue(@xml,'//b[1]')
+b1 c1b1 c2b1
+SELECT extractValue(@xml,'/descendant::b[1]');
+extractValue(@xml,'/descendant::b[1]')
+b1
+SET @xml='<a><b>b1</b><b>b2</b></a>';
+SELECT extractValue(@xml,'/a/b[1+0]');
+extractValue(@xml,'/a/b[1+0]')
+b1
+SELECT extractValue(@xml,'/a/b[1*1]');
+extractValue(@xml,'/a/b[1*1]')
+b1
+SELECT extractValue(@xml,'/a/b[--1]');
+extractValue(@xml,'/a/b[--1]')
+b1
+SELECT extractValue(@xml,'/a/b[2*1-1]');
+extractValue(@xml,'/a/b[2*1-1]')
+b1
+SELECT extractValue(@xml,'/a/b[1+1]');
+extractValue(@xml,'/a/b[1+1]')
+b2
+SELECT extractValue(@xml,'/a/b[1*2]');
+extractValue(@xml,'/a/b[1*2]')
+b2
+SELECT extractValue(@xml,'/a/b[--2]');
+extractValue(@xml,'/a/b[--2]')
+b2
+SELECT extractValue(@xml,'/a/b[1*(3-1)]');
+extractValue(@xml,'/a/b[1*(3-1)]')
+b2
+SELECT extractValue(@xml,'//*[1=1]');
+extractValue(@xml,'//*[1=1]')
+b1 b2
+SELECT extractValue(@xml,'//*[1!=1]');
+extractValue(@xml,'//*[1!=1]')
+
+SELECT extractValue(@xml,'//*[1>1]');
+extractValue(@xml,'//*[1>1]')
+
+SELECT extractValue(@xml,'//*[2>1]');
+extractValue(@xml,'//*[2>1]')
+b1 b2
+SELECT extractValue(@xml,'//*[1>2]');
+extractValue(@xml,'//*[1>2]')
+
+SELECT extractValue(@xml,'//*[1>=1]');
+extractValue(@xml,'//*[1>=1]')
+b1 b2
+SELECT extractValue(@xml,'//*[2>=1]');
+extractValue(@xml,'//*[2>=1]')
+b1 b2
+SELECT extractValue(@xml,'//*[1>=2]');
+extractValue(@xml,'//*[1>=2]')
+
+SELECT extractValue(@xml,'//*[1<1]');
+extractValue(@xml,'//*[1<1]')
+
+SELECT extractValue(@xml,'//*[2<1]');
+extractValue(@xml,'//*[2<1]')
+
+SELECT extractValue(@xml,'//*[1<2]');
+extractValue(@xml,'//*[1<2]')
+b1 b2
+SELECT extractValue(@xml,'//*[1<=1]');
+extractValue(@xml,'//*[1<=1]')
+b1 b2
+SELECT extractValue(@xml,'//*[2<=1]');
+extractValue(@xml,'//*[2<=1]')
+
+SELECT extractValue(@xml,'//*[1<=2]');
+extractValue(@xml,'//*[1<=2]')
+b1 b2
+SET @xml='<a><b>b11<c>c11</c></b><b>b21<c>c21</c></b></a>';
+SELECT extractValue(@xml,'/a/b[c="c11"]');
+extractValue(@xml,'/a/b[c="c11"]')
+b11
+SELECT extractValue(@xml,'/a/b[c="c21"]');
+extractValue(@xml,'/a/b[c="c21"]')
+b21
+SET @xml='<a><b c="c11">b11</b><b c="c21">b21</b></a>';
+SELECT extractValue(@xml,'/a/b[@c="c11"]');
+extractValue(@xml,'/a/b[@c="c11"]')
+b11
+SELECT extractValue(@xml,'/a/b[@c="c21"]');
+extractValue(@xml,'/a/b[@c="c21"]')
+b21
+SET @xml='<a>a1<b c="c11">b11<d>d11</d></b><b c="c21">b21<d>d21</d></b></a>';
+SELECT extractValue(@xml, '/a/b[@c="c11"]/d');
+extractValue(@xml, '/a/b[@c="c11"]/d')
+d11
+SELECT extractValue(@xml, '/a/b[@c="c21"]/d');
+extractValue(@xml, '/a/b[@c="c21"]/d')
+d21
+SELECT extractValue(@xml, '/a/b[d="d11"]/@c');
+extractValue(@xml, '/a/b[d="d11"]/@c')
+c11
+SELECT extractValue(@xml, '/a/b[d="d21"]/@c');
+extractValue(@xml, '/a/b[d="d21"]/@c')
+c21
+SELECT extractValue(@xml, '/a[b="b11"]');
+extractValue(@xml, '/a[b="b11"]')
+a1
+SELECT extractValue(@xml, '/a[b/@c="c11"]');
+extractValue(@xml, '/a[b/@c="c11"]')
+a1
+SELECT extractValue(@xml, '/a[b/d="d11"]');
+extractValue(@xml, '/a[b/d="d11"]')
+a1
+SELECT extractValue(@xml, '/a[/a/b="b11"]');
+extractValue(@xml, '/a[/a/b="b11"]')
+a1
+SELECT extractValue(@xml, '/a[/a/b/@c="c11"]');
+extractValue(@xml, '/a[/a/b/@c="c11"]')
+a1
+SELECT extractValue(@xml, '/a[/a/b/d="d11"]');
+extractValue(@xml, '/a[/a/b/d="d11"]')
+a1
+SELECT extractValue('<a>a</a>', '/a[false()]');
+extractValue('<a>a</a>', '/a[false()]')
+
+SELECT extractValue('<a>a</a>', '/a[true()]');
+extractValue('<a>a</a>', '/a[true()]')
+a
+SELECT extractValue('<a>a</a>', '/a[not(false())]');
+extractValue('<a>a</a>', '/a[not(false())]')
+a
+SELECT extractValue('<a>a</a>', '/a[not(true())]');
+extractValue('<a>a</a>', '/a[not(true())]')
+
+SELECT extractValue('<a>a</a>', '/a[true() and true()]');
+extractValue('<a>a</a>', '/a[true() and true()]')
+a
+SELECT extractValue('<a>a</a>', '/a[true() and false()]');
+extractValue('<a>a</a>', '/a[true() and false()]')
+
+SELECT extractValue('<a>a</a>', '/a[false()and false()]');
+extractValue('<a>a</a>', '/a[false()and false()]')
+
+SELECT extractValue('<a>a</a>', '/a[false()and true()]');
+extractValue('<a>a</a>', '/a[false()and true()]')
+
+SELECT extractValue('<a>a</a>', '/a[true() or true()]');
+extractValue('<a>a</a>', '/a[true() or true()]')
+a
+SELECT extractValue('<a>a</a>', '/a[true() or false()]');
+extractValue('<a>a</a>', '/a[true() or false()]')
+a
+SELECT extractValue('<a>a</a>', '/a[false()or false()]');
+extractValue('<a>a</a>', '/a[false()or false()]')
+
+SELECT extractValue('<a>a</a>', '/a[false()or true()]');
+extractValue('<a>a</a>', '/a[false()or true()]')
+a
+SET @xml='<a>ab<b c="c" c="e">b1</b><b c="d">b2</b><b c="f" c="e">b3</b></a>';
+select extractValue(@xml,'/a/b[@c="c"]');
+extractValue(@xml,'/a/b[@c="c"]')
+b1
+select extractValue(@xml,'/a/b[@c="d"]');
+extractValue(@xml,'/a/b[@c="d"]')
+b2
+select extractValue(@xml,'/a/b[@c="e"]');
+extractValue(@xml,'/a/b[@c="e"]')
+b1 b3
+select extractValue(@xml,'/a/b[not(@c="e")]');
+extractValue(@xml,'/a/b[not(@c="e")]')
+b2
+select extractValue(@xml,'/a/b[@c!="e"]');
+extractValue(@xml,'/a/b[@c!="e"]')
+b1 b2 b3
+select extractValue(@xml,'/a/b[@c="c" or @c="d"]');
+extractValue(@xml,'/a/b[@c="c" or @c="d"]')
+b1 b2
+select extractValue(@xml,'/a/b[@c="c" and @c="e"]');
+extractValue(@xml,'/a/b[@c="c" and @c="e"]')
+b1
+SET @xml='<a><b c="c" d="d">b1</b><b d="d" e="e">b2</b></a>';
+select extractValue(@xml,'/a/b[@c]');
+extractValue(@xml,'/a/b[@c]')
+b1
+select extractValue(@xml,'/a/b[@d]');
+extractValue(@xml,'/a/b[@d]')
+b1 b2
+select extractValue(@xml,'/a/b[@e]');
+extractValue(@xml,'/a/b[@e]')
+b2
+select extractValue(@xml,'/a/b[not(@c)]');
+extractValue(@xml,'/a/b[not(@c)]')
+b2
+select extractValue(@xml,'/a/b[not(@d)]');
+extractValue(@xml,'/a/b[not(@d)]')
+
+select extractValue(@xml,'/a/b[not(@e)]');
+extractValue(@xml,'/a/b[not(@e)]')
+b1
+select extractValue(@xml, '/a/b[boolean(@c) or boolean(@d)]');
+extractValue(@xml, '/a/b[boolean(@c) or boolean(@d)]')
+b1 b2
+select extractValue(@xml, '/a/b[boolean(@c) or boolean(@e)]');
+extractValue(@xml, '/a/b[boolean(@c) or boolean(@e)]')
+b1 b2
+select extractValue(@xml, '/a/b[boolean(@d) or boolean(@e)]');
+extractValue(@xml, '/a/b[boolean(@d) or boolean(@e)]')
+b1 b2
+select extractValue(@xml, '/a/b[boolean(@c) and boolean(@d)]');
+extractValue(@xml, '/a/b[boolean(@c) and boolean(@d)]')
+b1
+select extractValue(@xml, '/a/b[boolean(@c) and boolean(@e)]');
+extractValue(@xml, '/a/b[boolean(@c) and boolean(@e)]')
+
+select extractValue(@xml, '/a/b[boolean(@d) and boolean(@e)]');
+extractValue(@xml, '/a/b[boolean(@d) and boolean(@e)]')
+b2
+select extractValue(@xml, '/a/b[@c or @d]');
+extractValue(@xml, '/a/b[@c or @d]')
+b1 b2
+select extractValue(@xml, '/a/b[@c or @e]');
+extractValue(@xml, '/a/b[@c or @e]')
+b1 b2
+select extractValue(@xml, '/a/b[@d or @e]');
+extractValue(@xml, '/a/b[@d or @e]')
+b1 b2
+select extractValue(@xml, '/a/b[@c and @d]');
+extractValue(@xml, '/a/b[@c and @d]')
+b1
+select extractValue(@xml, '/a/b[@c and @e]');
+extractValue(@xml, '/a/b[@c and @e]')
+
+select extractValue(@xml, '/a/b[@d and @e]');
+extractValue(@xml, '/a/b[@d and @e]')
+b2
+SET @xml='<a><b c="c">b1</b><b>b2</b></a>';
+SELECT extractValue(@xml,'/a/b[@*]');
+extractValue(@xml,'/a/b[@*]')
+b1
+SELECT extractValue(@xml,'/a/b[not(@*)]');
+extractValue(@xml,'/a/b[not(@*)]')
+b2
+SELECT extractValue('<a>a</a>', '/a[ceiling(3.1)=4]');
+extractValue('<a>a</a>', '/a[ceiling(3.1)=4]')
+a
+SELECT extractValue('<a>a</a>', '/a[floor(3.1)=3]');
+extractValue('<a>a</a>', '/a[floor(3.1)=3]')
+a
+SELECT extractValue('<a>a</a>', '/a[round(3.1)=3]');
+extractValue('<a>a</a>', '/a[round(3.1)=3]')
+a
+SELECT extractValue('<a>a</a>', '/a[round(3.8)=4]');
+extractValue('<a>a</a>', '/a[round(3.8)=4]')
+a
+SELECT extractValue('<a><b>b</b><c>c</c></a>', '/a/b | /a/c');
+extractValue('<a><b>b</b><c>c</c></a>', '/a/b | /a/c')
+b c
+select extractValue('<a b="b1" b="b2" b="b3"/>','/a/@b[position()=1]');
+extractValue('<a b="b1" b="b2" b="b3"/>','/a/@b[position()=1]')
+b1
+select extractValue('<a b="b1" b="b2" b="b3"/>','/a/@b[position()=2]');
+extractValue('<a b="b1" b="b2" b="b3"/>','/a/@b[position()=2]')
+b2
+select extractValue('<a b="b1" b="b2" b="b3"/>','/a/@b[position()=3]');
+extractValue('<a b="b1" b="b2" b="b3"/>','/a/@b[position()=3]')
+b3
+select extractValue('<a b="b1" b="b2" b="b3"/>','/a/@b[1=position()]');
+extractValue('<a b="b1" b="b2" b="b3"/>','/a/@b[1=position()]')
+b1
+select extractValue('<a b="b1" b="b2" b="b3"/>','/a/@b[2=position()]');
+extractValue('<a b="b1" b="b2" b="b3"/>','/a/@b[2=position()]')
+b2
+select extractValue('<a b="b1" b="b2" b="b3"/>','/a/@b[3=position()]');
+extractValue('<a b="b1" b="b2" b="b3"/>','/a/@b[3=position()]')
+b3
+select extractValue('<a b="b1" b="b2" b="b3"/>','/a/@b[2>=position()]');
+extractValue('<a b="b1" b="b2" b="b3"/>','/a/@b[2>=position()]')
+b1 b2
+select extractValue('<a b="b1" b="b2" b="b3"/>','/a/@b[2<=position()]');
+extractValue('<a b="b1" b="b2" b="b3"/>','/a/@b[2<=position()]')
+b2 b3
+select extractValue('<a b="b1" b="b2" b="b3"/>','/a/@b[position()=3 or position()=2]');
+extractValue('<a b="b1" b="b2" b="b3"/>','/a/@b[position()=3 or position()=2]')
+b2 b3
+SELECT extractValue('<a>a<b>a1<c>c1</c></b><b>a2</b></a>','/a/b[count(c)=0]');
+extractValue('<a>a<b>a1<c>c1</c></b><b>a2</b></a>','/a/b[count(c)=0]')
+a2
+SELECT extractValue('<a>a<b>a1<c>c1</c></b><b>a2</b></a>','/a/b[count(c)=1]');
+extractValue('<a>a<b>a1<c>c1</c></b><b>a2</b></a>','/a/b[count(c)=1]')
+a1
+select extractValue('<a>a1<b ba="1" ba="2">b1</b><b>b2</b>4</a>','/a/b[sum(@ba)=3]');
+extractValue('<a>a1<b ba="1" ba="2">b1</b><b>b2</b>4</a>','/a/b[sum(@ba)=3]')
+b1
+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[boolean(1)]');
+extractValue('<a><b>b1</b><b>b2</b></a>','/a/b[boolean(1)]')
+b1 b2
+select extractValue('<a><b>b1</b><b>b2</b></a>','/a/b[true()]');
+extractValue('<a><b>b1</b><b>b2</b></a>','/a/b[true()]')
+b1 b2
+select extractValue('<a><b>b1</b><b>b2</b></a>','/a/b[number(true())]');
+extractValue('<a><b>b1</b><b>b2</b></a>','/a/b[number(true())]')
+b1
+select extractValue('<a>ab</a>','/a[contains("abc","b")]');
+extractValue('<a>ab</a>','/a[contains("abc","b")]')
+ab
+select extractValue('<a>ab</a>','/a[contains(.,"a")]');
+extractValue('<a>ab</a>','/a[contains(.,"a")]')
+ab
+select extractValue('<a>ab</a>','/a[contains(.,"b")]');
+extractValue('<a>ab</a>','/a[contains(.,"b")]')
+ab
+select extractValue('<a>ab</a>','/a[contains(.,"c")]');
+extractValue('<a>ab</a>','/a[contains(.,"c")]')
+
+select extractValue('<a b="1">ab</a>','/a[concat(@b,"2")="12"]');
+extractValue('<a b="1">ab</a>','/a[concat(@b,"2")="12"]')
+ab
+SET @xml='<a b="11" b="12" b="21" b="22">ab</a>';
+select extractValue(@xml, '/a/@b[substring(.,2)="1"]');
+extractValue(@xml, '/a/@b[substring(.,2)="1"]')
+11 21
+select extractValue(@xml, '/a/@b[substring(.,2)="2"]');
+extractValue(@xml, '/a/@b[substring(.,2)="2"]')
+12 22
+select extractValue(@xml, '/a/@b[substring(.,1,1)="1"]');
+extractValue(@xml, '/a/@b[substring(.,1,1)="1"]')
+11 12
+select extractValue(@xml, '/a/@b[substring(.,1,1)="2"]');
+extractValue(@xml, '/a/@b[substring(.,1,1)="2"]')
+21 22
+select extractValue(@xml, '/a/@b[substring(.,2,1)="1"]');
+extractValue(@xml, '/a/@b[substring(.,2,1)="1"]')
+11 21
+select extractValue(@xml, '/a/@b[substring(.,2,1)="2"]');
+extractValue(@xml, '/a/@b[substring(.,2,1)="2"]')
+12 22
+SET @xml='<a b="b11" b="b12" b="b21" b="22"/>';
+select extractValue(@xml,'/a/@b');
+extractValue(@xml,'/a/@b')
+b11 b12 b21 22
+select extractValue(@xml,'/a/@b[contains(.,"1")]');
+extractValue(@xml,'/a/@b[contains(.,"1")]')
+b11 b12 b21
+select extractValue(@xml,'/a/@b[contains(.,"1")][contains(.,"2")]');
+extractValue(@xml,'/a/@b[contains(.,"1")][contains(.,"2")]')
+b12 b21
+select extractValue(@xml,'/a/@b[contains(.,"1")][contains(.,"2")][2]');
+extractValue(@xml,'/a/@b[contains(.,"1")][contains(.,"2")][2]')
+b21
+SET @xml='<a>a1<b>b1<c>c1</c>b2</b>a2</a>';
+select UpdateXML('<a>a1<b>b1<c>c1</c>b2</b>a2</a>','/a/b/c','+++++++++');
+UpdateXML('<a>a1<b>b1<c>c1</c>b2</b>a2</a>','/a/b/c','+++++++++')
+<a>a1<b>b1+++++++++b2</b>a2</a>
+select UpdateXML('<a>a1<b>b1<c>c1</c>b2</b>a2</a>','/a/b/c','<c1>+++++++++</c1>');
+UpdateXML('<a>a1<b>b1<c>c1</c>b2</b>a2</a>','/a/b/c','<c1>+++++++++</c1>')
+<a>a1<b>b1<c1>+++++++++</c1>b2</b>a2</a>
+select UpdateXML('<a>a1<b>b1<c>c1</c>b2</b>a2</a>','/a/b/c','<c1/>');
+UpdateXML('<a>a1<b>b1<c>c1</c>b2</b>a2</a>','/a/b/c','<c1/>')
+<a>a1<b>b1<c1/>b2</b>a2</a>
+SET @xml='<a><b>bb</b></a>';
+select UpdateXML(@xml, '/a/b', '<b>ccc</b>');
+UpdateXML(@xml, '/a/b', '<b>ccc</b>')
+<a><b>ccc</b></a>
+SET @xml='<a aa1="aa1" aa2="aa2"><b bb1="bb1" bb2="bb2">bb</b></a>';
+select UpdateXML(@xml, '/a/b', '<b>ccc</b>');
+UpdateXML(@xml, '/a/b', '<b>ccc</b>')
+<a aa1="aa1" aa2="aa2"><b>ccc</b></a>
+select UpdateXML(@xml, '/a/@aa1', '');
+UpdateXML(@xml, '/a/@aa1', '')
+<a  aa2="aa2"><b bb1="bb1" bb2="bb2">bb</b></a>
+select UpdateXML(@xml, '/a/@aa1', 'aa3="aa3"');
+UpdateXML(@xml, '/a/@aa1', 'aa3="aa3"')
+<a aa3="aa3" aa2="aa2"><b bb1="bb1" bb2="bb2">bb</b></a>
+select UpdateXML(@xml, '/a/@aa2', '');
+UpdateXML(@xml, '/a/@aa2', '')
+<a aa1="aa1" ><b bb1="bb1" bb2="bb2">bb</b></a>
+select UpdateXML(@xml, '/a/@aa2', 'aa3="aa3"');
+UpdateXML(@xml, '/a/@aa2', 'aa3="aa3"')
+<a aa1="aa1" aa3="aa3"><b bb1="bb1" bb2="bb2">bb</b></a>
+select UpdateXML(@xml, '/a/b/@bb1', '');
+UpdateXML(@xml, '/a/b/@bb1', '')
+<a aa1="aa1" aa2="aa2"><b  bb2="bb2">bb</b></a>
+select UpdateXML(@xml, '/a/b/@bb1', 'bb3="bb3"');
+UpdateXML(@xml, '/a/b/@bb1', 'bb3="bb3"')
+<a aa1="aa1" aa2="aa2"><b bb3="bb3" bb2="bb2">bb</b></a>
+select UpdateXML(@xml, '/a/b/@bb2', '');
+UpdateXML(@xml, '/a/b/@bb2', '')
+<a aa1="aa1" aa2="aa2"><b bb1="bb1" >bb</b></a>
+select UpdateXML(@xml, '/a/b/@bb2', 'bb3="bb3"');
+UpdateXML(@xml, '/a/b/@bb2', 'bb3="bb3"')
+<a aa1="aa1" aa2="aa2"><b bb1="bb1" bb3="bb3">bb</b></a>