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Added make_tmp_table_name() to simplify creating temporary table names

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This commit is contained in:
Monty
2025-01-05 14:50:45 +02:00
parent efc5d3f84d
commit c234a312d7
6 changed files with 40 additions and 32 deletions
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39
sql/sql_table.cc
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@@ -635,6 +635,25 @@ uint build_table_filename(char *buff, size_t bufflen, const char *db,
}
/**
Create a temporary table name
@param to string. Note that to->length should contain buffer length
*/
void make_tmp_table_name(THD *thd, LEX_STRING *to, const char *prefix)
{
to->length= my_snprintf((char*) to->str, to->length, "%s-%s-%lx-%llx-%x",
tmp_file_prefix, prefix, current_pid,
thd->thread_id, thd->tmp_table++);
if (lower_case_table_names)
{
// Ok to use latin1 as the file name is in the form '#sql-exchange-abc-def'
my_casedn_str_latin1(to->str);
}
}
/**
Create path to a temporary table mysql_tmpdir/#sql-temptable-1234-12-1
(i.e. to its .FRM file but without an extension).
@@ -652,18 +671,15 @@ uint build_table_filename(char *buff, size_t bufflen, const char *db,
uint build_tmptable_filename(THD* thd, char *buff, size_t bufflen)
{
LEX_STRING name;
DBUG_ENTER("build_tmptable_filename");
char *p= strnmov(buff, mysql_tmpdir, bufflen);
my_snprintf(p, bufflen - (p - buff), "/%s-temptable-%lx-%llx-%x",
tmp_file_prefix, current_pid,
thd->thread_id, thd->tmp_table++);
char *p= strnmov(buff, mysql_tmpdir, bufflen-2);
*p++= '/';
if (lower_case_table_names)
{
/* Convert all except tmpdir to lower case */
my_casedn_str_latin1(p);
}
name= {p, bufflen - (p - buff) };
make_tmp_table_name(thd, &name, "temptable");
size_t length= unpack_filename(buff, buff);
DBUG_PRINT("exit", ("buff: '%s'", buff));
@@ -707,9 +723,10 @@ uint build_table_shadow_filename(char *buff, size_t bufflen,
bool backup)
{
char tmp_name[FN_REFLEN];
my_snprintf(tmp_name, sizeof (tmp_name), "%s-%s-%lx-%s", tmp_file_prefix,
my_snprintf(tmp_name, sizeof(tmp_name), "%s-%s-%lx-%s", tmp_file_prefix,
backup ? "backup" : "shadow",
(ulong) current_thd->thread_id, lpt->alter_info->table_name.str);
(ulong) lpt->thd->thread_id, lpt->alter_info->table_name.str);
return build_table_filename(buff, bufflen, lpt->alter_info->db.str, tmp_name,
"", FN_IS_TMP);
}