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A fix (bug #6564: QUOTE(NULL) returns NULL, not the string 'NULL')

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unknown
2004-11-11 18:20:40 +04:00
parent ce62fb28c0
commit baf1c89e3d
3 changed files with 21 additions and 4 deletions
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5
mysql-test/r/func_str.result
View File

@ -167,6 +167,9 @@ length(quote(concat(char(0),"test")))
select hex(quote(concat(char(224),char(227),char(230),char(231),char(232),char(234),char(235))));
hex(quote(concat(char(224),char(227),char(230),char(231),char(232),char(234),char(235))))
27E0E3E6E7E8EAEB27
select concat('a', quote(NULL));
concat('a', quote(NULL))
aNULL
select reverse("");
reverse("")
@ -278,7 +281,7 @@ insert into t1 values ('one'),(NULL),('two'),('four');
select a, quote(a), isnull(quote(a)), quote(a) is null, ifnull(quote(a), 'n') from t1;
a quote(a) isnull(quote(a)) quote(a) is null ifnull(quote(a), 'n')
one 'one' 0 0 'one'
NULL NULL 1 1 n
NULL NULL 0 0 NULL
two 'two' 0 0 'two'
four 'four' 0 0 'four'
drop table t1;

6
mysql-test/t/func_str.test
View File

@ -69,6 +69,12 @@ select quote(1/0), quote('\0\Z');
select length(quote(concat(char(0),"test")));
select hex(quote(concat(char(224),char(227),char(230),char(231),char(232),char(234),char(235))));
#
# Bug #6564: QUOTE(NULL
#
select concat('a', quote(NULL));
#
# Wrong usage of functions
#

14
sql/item_strfunc.cc
View File

@ -2142,9 +2142,12 @@ String* Item_func_inet_ntoa::val_str(String* str)
This function is very useful when you want to generate SQL statements
RETURN VALUES
NOTE
QUOTE(NULL) returns the string 'NULL' (4 letters, without quotes).
RETURN VALUES
str Quoted string
NULL Argument to QUOTE() was NULL or out of memory.
NULL Out of memory.
*/
#define get_esc_bit(mask, num) (1 & (*((mask) + ((num) >> 3))) >> ((num) & 7))
@ -2168,7 +2171,12 @@ String *Item_func_quote::val_str(String *str)
String *arg= args[0]->val_str(str);
uint arg_length, new_length;
if (!arg) // Null argument
goto null;
{
str->copy("NULL", 4); // Return the string 'NULL'
null_value= 0;
return str;
}
arg_length= arg->length();
new_length= arg_length+2; /* for beginning and ending ' signs */