BUG#9657 mysqldump xml ( -x ) does not format NULL fields correctly

 - Importing the bug fixes by patch due to merge problems.

client/mysqldump.c

@@ -463,7 +463,10 @@ static void write_header(FILE *sql_file, char *db_name)
   if (opt_xml)
   {
     fputs("<?xml version=\"1.0\"?>\n", sql_file);
-    fputs("<mysqldump>\n", sql_file);
+    fputs("<mysqldump ", sql_file);
+    fputs("xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\"",
+          sql_file);
+    fputs(">\n", sql_file);
     check_io(sql_file);
   }
   else if (!opt_compact)
@@ -1050,6 +1053,40 @@ static void print_xml_tag1(FILE * xml_file, const char* sbeg,
 }
 
 
+/*
+  Print xml tag with for a field that is null
+
+  SYNOPSIS
+    print_xml_null_tag()
+    xml_file	- output file
+    sbeg	- line beginning
+    stag_atr	- tag and attribute
+    sval	- value of attribute
+    send	- line ending
+
+  DESCRIPTION
+    Print tag with one attribute to the xml_file. Format is:
+      <stag_atr="sval" xsi:nil="true"/>
+  NOTE
+    sval MUST be a NULL terminated string.
+    sval string will be qouted before output.
+*/
+
+static void print_xml_null_tag(FILE * xml_file, const char* sbeg,
+                               const char* stag_atr, const char* sval,
+                               const char* send)
+{
+  fputs(sbeg, xml_file);
+  fputs("<", xml_file);
+  fputs(stag_atr, xml_file);
+  fputs("\"", xml_file);
+  print_quoted_xml(xml_file, sval, strlen(sval));
+  fputs("\" xsi:nil=\"true\" />", xml_file);
+  fputs(send, xml_file);
+  check_io(xml_file);
+}
+
+
 /*
   Print xml tag with many attributes.
 
@@ -1870,7 +1907,14 @@ static void dumpTable(uint numFields, char *table)
 	    }
 	  }
 	  else
-            fputs("NULL", md_result_file);
+          {
+            /* The field value is NULL */
+            if (!opt_xml)
+              fputs("NULL", md_result_file);
+            else
+              print_xml_null_tag(md_result_file, "\t\t", "field name=",
+                                 field->name, "\n");
+          }
           check_io(md_result_file);
 	}
       }

mysql-test/r/mysqldump.result

@@ -2,7 +2,7 @@ DROP TABLE IF EXISTS t1, `"t"1`;
 CREATE TABLE t1(a int);
 INSERT INTO t1 VALUES (1), (2);
 <?xml version="1.0"?>
-<mysqldump>
+<mysqldump xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
 <database name="test">
 	<table_structure name="t1">
 		<field Field="a" Type="int(11)" Null="YES" Key="" Extra="" />
@@ -103,7 +103,7 @@ DROP TABLE t1;
 CREATE TABLE t1(a int, b text, c varchar(3));
 INSERT INTO t1 VALUES (1, "test", "tes"), (2, "TEST", "TES");
 <?xml version="1.0"?>
-<mysqldump>
+<mysqldump xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
 <database name="test">
 	<table_structure name="t1">
 		<field Field="a" Type="int(11)" Null="YES" Key="" Extra="" />
@@ -128,7 +128,7 @@ DROP TABLE t1;
 CREATE TABLE t1 (`a"b"` char(2));
 INSERT INTO t1 VALUES ("1\""), ("\"2");
 <?xml version="1.0"?>
-<mysqldump>
+<mysqldump xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
 <database name="test">
 	<table_structure name="t1">
 		<field Field="a&quot;b&quot;" Type="char(2)" Null="YES" Key="" Extra="" />
@@ -1436,3 +1436,59 @@ MYSQL_DUMP_DIR: Got error: 1049: Unknown database 'mysqldump_test_d' when select
 MYSQL_DUMP_DIR: Got error: 1102: Incorrect database name 'mysqld\ump_test_db' when selecting the database
 drop table t1, t2, t3;
 drop database mysqldump_test_db;
+create table t1 (a int(10));
+create table t2 (pk int primary key auto_increment,
+a int(10), b varchar(30), c datetime, d blob, e text);
+insert into t1 values (NULL), (10), (20);
+insert into t2 (a, b) values (NULL, NULL),(10, NULL),(NULL, "twenty"),(30, "thirty");
+<?xml version="1.0"?>
+<mysqldump xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
+<database name="test">
+	<table_data name="t1">
+	<row>
+		<field name="a" xsi:nil="true" />
+	</row>
+	<row>
+		<field name="a">10</field>
+	</row>
+	<row>
+		<field name="a">20</field>
+ 	</row>
+	</table_data>
+	<table_data name="t2">
+	<row>
+		<field name="pk">1</field>
+		<field name="a" xsi:nil="true" />
+		<field name="b" xsi:nil="true" />
+		<field name="c" xsi:nil="true" />
+		<field name="d" xsi:nil="true" />
+		<field name="e" xsi:nil="true" />
+	</row>
+	<row>
+		<field name="pk">2</field>
+		<field name="a">10</field>
+		<field name="b" xsi:nil="true" />
+		<field name="c" xsi:nil="true" />
+		<field name="d" xsi:nil="true" />
+		<field name="e" xsi:nil="true" />
+	</row>
+	<row>
+		<field name="pk">3</field>
+		<field name="a" xsi:nil="true" />
+		<field name="b">twenty</field>
+		<field name="c" xsi:nil="true" />
+		<field name="d" xsi:nil="true" />
+		<field name="e" xsi:nil="true" />
+	</row>
+	<row>
+		<field name="pk">4</field>
+		<field name="a">30</field>
+		<field name="b">thirty</field>
+		<field name="c" xsi:nil="true" />
+		<field name="d" xsi:nil="true" />
+		<field name="e" xsi:nil="true" />
+	</row>
+	</table_data>
+</database>
+</mysqldump>
+drop table t1, t2;

mysql-test/t/mysqldump.test

@@ -636,3 +636,16 @@ drop table t1, t2, t3;
 drop database mysqldump_test_db;
 
 
+
+#
+# Bug #9657 mysqldump xml ( -x ) does not format NULL fields correctly
+#
+
+create table t1 (a int(10));
+create table t2 (pk int primary key auto_increment,
+a int(10), b varchar(30), c datetime, d blob, e text);
+insert into t1 values (NULL), (10), (20);
+insert into t2 (a, b) values (NULL, NULL),(10, NULL),(NULL, "twenty"),(30, "thirty");
+--exec $MYSQL_DUMP  --skip-comments --xml --no-create-info test
+drop table t1, t2;
+