Change 'mysql' client to output XML like the 'mysqldump'

tool does, with the column names as attributes on <field>
elements, instead of trying to use the column name as the
element name. Also fix some encoding issues. (Bug #7811)


client/mysql.cc:
  Quote > and " in XML output, and use <field name="XXX"></field>
  instead of <XXX></XXX>, to make the output more like
  mysqldump --xml and avoid having to turn XXX into a sensible
  element name.

client/mysql.cc

@@ -154,6 +154,8 @@ static char mysql_charsets_dir[FN_REFLEN+1];
 static const char *xmlmeta[] = {
   "&", "&",
   "<", "&lt;",
+  ">", "&gt;",
+  "\"", "&quot;",
   0, 0
 };
 static const char *day_names[]={"Sun","Mon","Tue","Wed","Thu","Fri","Sat"};
@@ -2116,13 +2118,11 @@ print_table_data_xml(MYSQL_RES *result)
     (void) tee_fputs("\n  <row>\n", PAGER);
     for (uint i=0; i < mysql_num_fields(result); i++)
     {
-      tee_fprintf(PAGER, "\t<%s>", (fields[i].name ?
-				  (fields[i].name[0] ? fields[i].name :
-				   " &nbsp; ") : "NULL"));
+      tee_fprintf(PAGER, "\t<field name=\"");
+      xmlencode_print(fields[i].name, strlen(fields[i].name));
+      tee_fprintf(PAGER, "\">");
       xmlencode_print(cur[i], lengths[i]);
-      tee_fprintf(PAGER, "</%s>\n", (fields[i].name ?
-				     (fields[i].name[0] ? fields[i].name :
-				      " &nbsp; ") : "NULL"));
+      tee_fprintf(PAGER, "</field>\n");
     }
     (void) tee_fputs("  </row>\n", PAGER);
   }

mysql-test/r/client_xml.result

+create table t1 (
+`a&b` int,
+`a<b` int,
+`a>b` text
+);
+insert into t1 values (1, 2, 'a&b a<b a>b');
+<?xml version="1.0"?>
+
+<resultset statement="select * from t1
+">
+  <row>
+	<field name="a&amp;b">1</field>
+	<field name="a&lt;b">2</field>
+	<field name="a&gt;b">a&amp;b a&lt;b a&gt;b</field>
+  </row>
+</resultset>
+<?xml version="1.0"?>
+<mysqldump>
+<database name="test">
+	<table_structure name="t1">
+		<field Field="a&amp;b" Type="int(11)" Null="YES" Key="" Extra="" />
+		<field Field="a&lt;b" Type="int(11)" Null="YES" Key="" Extra="" />
+		<field Field="a&gt;b" Type="text" Null="YES" Key="" Extra="" />
+		<options Name="t1" Engine="MyISAM" Version="9" Row_format="Dynamic" Rows="1" Avg_row_length="28" Data_length="28" Max_data_length="4294967295" Index_length="1024" Data_free="0" Create_time="2005-01-26 01:21:39" Update_time="2005-01-26 01:21:39" Collation="latin1_swedish_ci" Create_options="" Comment="" />
+	</table_structure>
+	<table_data name="t1">
+	<row>
+		<field name="a&amp;b">1</field>
+		<field name="a&lt;b">2</field>
+		<field name="a&gt;b">a&amp;b a&lt;b a&gt;b</field>
+	</row>
+	</table_data>
+</database>
+</mysqldump>
+<?xml version="1.0"?>
+
+<resultset statement="select count(*) from t1
+">
+  <row>
+	<field name="count(*)">1</field>
+  </row>
+</resultset>
+<?xml version="1.0"?>
+
+<resultset statement="select 1 &lt; 2 from dual
+">
+  <row>
+	<field name="1 &lt; 2">1</field>
+  </row>
+</resultset>
+<?xml version="1.0"?>
+
+<resultset statement="select 1 &gt; 2 from dual
+">
+  <row>
+	<field name="1 &gt; 2">0</field>
+  </row>
+</resultset>
+<?xml version="1.0"?>
+
+<resultset statement="select 1 &amp; 3 from dual
+">
+  <row>
+	<field name="1 &amp; 3">1</field>
+  </row>
+</resultset>
+<?xml version="1.0"?>
+
+<resultset statement="select null from dual
+">
+  <row>
+	<field name="NULL">NULL</field>
+  </row>
+</resultset>
+drop table t1;

mysql-test/t/client_xml.test

+# Test of the xml output of the 'mysql' and 'mysqldump' clients -- makes
+# sure that basic encoding issues are handled properly
+create table t1 (
+  `a&b` int,
+  `a<b` int,
+  `a>b` text
+);
+insert into t1 values (1, 2, 'a&b a<b a>b');
+--exec $MYSQL --xml test -e 'select * from t1'
+--exec $MYSQL_DUMP --xml test
+
+--exec $MYSQL --xml test -e 'select count(*) from t1'
+--exec $MYSQL --xml test -e 'select 1 < 2 from dual'
+--exec $MYSQL --xml test -e 'select 1 > 2 from dual'
+--exec $MYSQL --xml test -e 'select 1 & 3 from dual'
+--exec $MYSQL --xml test -e 'select null from dual'
+
+drop table t1;