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Bug #7142 Show Fields from fails using Borland's dbExpress interface

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The problem here is that columns that have an especially long type 
such as an enum type with many options would be longer than 40 chars
but the type column returned from show columns always was defined
as varchar(40).

This is fixed in 5.0 using info schema.
This commit is contained in:
reggie@linux.site
2005-07-12 08:35:30 -06:00
parent 128ec8876b
commit 8a68788c39
8 changed files with 62 additions and 26 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
mysql-test/r/ps_1general.result
View File

@ -470,12 +470,12 @@ def id 8 3 1 N 32929 0 63
def select_type 253 19 6 N 1 31 8
def table 253 64 2 Y 0 31 8
def type 253 10 3 Y 0 31 8
def possible_keys 253 4096 0 Y 0 31 8
def possible_keys 252 4096 0 Y 0 31 8
def key 253 64 0 Y 0 31 8
def key_len 8 3 0 Y 32928 0 63
def ref 253 1024 0 Y 0 31 8
def ref 252 1024 0 Y 0 31 8
def rows 8 10 1 Y 32928 0 63
def Extra 253 255 14 N 1 31 8
def Extra 252 255 14 N 1 31 8
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 4 Using filesort
SET @arg00=1 ;
@ -486,12 +486,12 @@ def id 8 3 1 N 32929 0 63
def select_type 253 19 6 N 1 31 8
def table 253 64 2 Y 0 31 8
def type 253 10 5 Y 0 31 8
def possible_keys 253 4096 7 Y 0 31 8
def possible_keys 252 4096 7 Y 0 31 8
def key 253 64 7 Y 0 31 8
def key_len 8 3 1 Y 32928 0 63
def ref 253 1024 0 Y 0 31 8
def ref 252 1024 0 Y 0 31 8
def rows 8 10 1 Y 32928 0 63
def Extra 253 255 27 N 1 31 8
def Extra 252 255 27 N 1 31 8
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range PRIMARY PRIMARY 4 NULL 3 Using where; Using filesort
drop table if exists t2;

6
mysql-test/r/ps_2myisam.result
View File

@ -1153,12 +1153,12 @@ def id 8 3 1 N 32929 0 63
def select_type 253 19 6 N 1 31 8
def table 253 64 2 Y 0 31 8
def type 253 10 3 Y 0 31 8
def possible_keys 253 4096 0 Y 0 31 8
def possible_keys 252 4096 0 Y 0 31 8
def key 253 64 0 Y 0 31 8
def key_len 8 3 0 Y 32928 0 63
def ref 253 1024 0 Y 0 31 8
def ref 252 1024 0 Y 0 31 8
def rows 8 10 1 Y 32928 0 63
def Extra 253 255 0 N 1 31 8
def Extra 252 255 0 N 1 31 8
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t9 ALL NULL NULL NULL NULL 2
drop table if exists t2 ;

6
mysql-test/r/ps_3innodb.result
View File

@ -1153,12 +1153,12 @@ def id 8 3 1 N 32929 0 63
def select_type 253 19 6 N 1 31 8
def table 253 64 2 Y 0 31 8
def type 253 10 3 Y 0 31 8
def possible_keys 253 4096 0 Y 0 31 8
def possible_keys 252 4096 0 Y 0 31 8
def key 253 64 0 Y 0 31 8
def key_len 8 3 0 Y 32928 0 63
def ref 253 1024 0 Y 0 31 8
def ref 252 1024 0 Y 0 31 8
def rows 8 10 1 Y 32928 0 63
def Extra 253 255 0 N 1 31 8
def Extra 252 255 0 N 1 31 8
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t9 ALL NULL NULL NULL NULL 2
test_sequence

6
mysql-test/r/ps_4heap.result
View File

@ -1154,12 +1154,12 @@ def id 8 3 1 N 32929 0 63
def select_type 253 19 6 N 1 31 8
def table 253 64 2 Y 0 31 8
def type 253 10 3 Y 0 31 8
def possible_keys 253 4096 0 Y 0 31 8
def possible_keys 252 4096 0 Y 0 31 8
def key 253 64 0 Y 0 31 8
def key_len 8 3 0 Y 32928 0 63
def ref 253 1024 0 Y 0 31 8
def ref 252 1024 0 Y 0 31 8
def rows 8 10 1 Y 32928 0 63
def Extra 253 255 0 N 1 31 8
def Extra 252 255 0 N 1 31 8
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t9 ALL NULL NULL NULL NULL 2
test_sequence

12
mysql-test/r/ps_5merge.result
View File

@ -1196,12 +1196,12 @@ def id 8 3 1 N 32929 0 63
def select_type 253 19 6 N 1 31 8
def table 253 64 2 Y 0 31 8
def type 253 10 3 Y 0 31 8
def possible_keys 253 4096 0 Y 0 31 8
def possible_keys 252 4096 0 Y 0 31 8
def key 253 64 0 Y 0 31 8
def key_len 8 3 0 Y 32928 0 63
def ref 253 1024 0 Y 0 31 8
def ref 252 1024 0 Y 0 31 8
def rows 8 10 1 Y 32928 0 63
def Extra 253 255 0 N 1 31 8
def Extra 252 255 0 N 1 31 8
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t9 ALL NULL NULL NULL NULL 2
test_sequence
@ -4210,12 +4210,12 @@ def id 8 3 1 N 32929 0 63
def select_type 253 19 6 N 1 31 8
def table 253 64 2 Y 0 31 8
def type 253 10 3 Y 0 31 8
def possible_keys 253 4096 0 Y 0 31 8
def possible_keys 252 4096 0 Y 0 31 8
def key 253 64 0 Y 0 31 8
def key_len 8 3 0 Y 32928 0 63
def ref 253 1024 0 Y 0 31 8
def ref 252 1024 0 Y 0 31 8
def rows 8 10 1 Y 32928 0 63
def Extra 253 255 0 N 1 31 8
def Extra 252 255 0 N 1 31 8
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t9 ALL NULL NULL NULL NULL 2
test_sequence

9
sql/item.cc
View File

@ -1768,7 +1768,14 @@ void Item::make_field(Send_field *tmp_field)
void Item_empty_string::make_field(Send_field *tmp_field)
{
init_make_field(tmp_field,FIELD_TYPE_VAR_STRING);
enum_field_types type = FIELD_TYPE_VAR_STRING;
if (max_length >= 16777216)
type = FIELD_TYPE_LONG_BLOB;
else if (max_length >= 65536)
type = FIELD_TYPE_MEDIUM_BLOB;
else if (max_length >= 256)
type = FIELD_TYPE_BLOB;
init_make_field(tmp_field, type);
}

31
sql/sql_show.cc
View File

@ -638,6 +638,30 @@ int mysqld_extend_show_tables(THD *thd,const char *db,const char *wild)
DBUG_RETURN(0);
}
/*
returns the length of the longest type on the given table.
This is used so that show fields will return the data using the proper
lengths instead of forcing columns such as type to always return with a
given length.
*/
uint get_longest_type_in_table(TABLE *table, const char *wild)
{
Field **ptr,*field;
char tmp[MAX_FIELD_WIDTH];
uint max_len = 0;
for (ptr=table->field; (field= *ptr); ptr++)
{
if (!wild || !wild[0] ||
!wild_case_compare(system_charset_info, field->field_name,wild))
{
String type(tmp,sizeof(tmp), system_charset_info);
field->sql_type(type);
max_len = max(max_len, type.length());
}
}
return max_len;
}
/***************************************************************************
** List all columns in a table_list->real_name
@ -667,9 +691,14 @@ mysqld_show_fields(THD *thd, TABLE_LIST *table_list,const char *wild,
#ifndef NO_EMBEDDED_ACCESS_CHECKS
(void) get_table_grant(thd, table_list);
#endif
/* we scan for the longest since long enum types can exceed 40 */
uint max_len = get_longest_type_in_table(table, wild);
List<Item> field_list;
field_list.push_back(new Item_empty_string("Field",NAME_LEN));
field_list.push_back(new Item_empty_string("Type",40));
field_list.push_back(new Item_empty_string("Type",
max_len > 40 ? max_len : 40));
if (verbose)
field_list.push_back(new Item_empty_string("Collation",40));
field_list.push_back(new Item_empty_string("Null",1));

6
tests/mysql_client_test.c
View File

@ -7173,7 +7173,7 @@ static void test_explain_bug()
verify_prepare_field(result, 3, "type", "", MYSQL_TYPE_VAR_STRING,
"", "", "", 10, 0);
verify_prepare_field(result, 4, "possible_keys", "", MYSQL_TYPE_VAR_STRING,
verify_prepare_field(result, 4, "possible_keys", "", MYSQL_TYPE_BLOB,
"", "", "", NAME_LEN*64, 0);
verify_prepare_field(result, 5, "key", "", MYSQL_TYPE_VAR_STRING,
@ -7186,13 +7186,13 @@ static void test_explain_bug()
(mysql_get_server_version(mysql) <= 50000 ? 3 : 4096),
0);
verify_prepare_field(result, 7, "ref", "", MYSQL_TYPE_VAR_STRING,
verify_prepare_field(result, 7, "ref", "", MYSQL_TYPE_BLOB,
"", "", "", NAME_LEN*16, 0);
verify_prepare_field(result, 8, "rows", "", MYSQL_TYPE_LONGLONG,
"", "", "", 10, 0);
verify_prepare_field(result, 9, "Extra", "", MYSQL_TYPE_VAR_STRING,
verify_prepare_field(result, 9, "Extra", "", MYSQL_TYPE_BLOB,
"", "", "", 255, 0);
mysql_free_result(result);