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Basic LEX::print function that supports UPDATEs

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This commit is contained in:
Sergei Petrunia
2020-03-07 01:26:28 +03:00
parent 92eed38c24
commit 0a9633ee62
2 changed files with 65 additions and 0 deletions
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64
sql/sql_lex.cc
View File

@@ -3514,6 +3514,70 @@ bool st_select_lex::setup_ref_array(THD *thd, uint order_group_num)
}
/*
@brief
Print the whole statement
@param str Print into this string
@param query_type Flags describing how to print
@detail
The intent is to allow to eventually print back any query.
This is useful e.g. for storage engines that take over diferrent kinds of
queries
*/
void LEX::print(String *str, enum_query_type query_type)
{
if (sql_command == SQLCOM_UPDATE)
{
SELECT_LEX *sel= first_select_lex();
str->append(STRING_WITH_LEN("UPDATE "));
if (ignore)
str->append(STRING_WITH_LEN("IGNORE "));
// table name
str->append(query_tables->alias);
str->append(STRING_WITH_LEN(" SET "));
// print item assignments
List_iterator<Item> it(sel->item_list);
List_iterator<Item> it2(value_list);
Item *col_ref, *value;
bool first= true;
while ((col_ref= it++) && (value= it2++))
{
if (first)
first= false;
else
str->append(STRING_WITH_LEN(", "));
col_ref->print(str, query_type);
str->append(STRING_WITH_LEN("="));
value->print(str, query_type);
}
str->append(STRING_WITH_LEN(" WHERE "));
sel->where->print(str, query_type);
if (sel->order_list.elements)
{
str->append(STRING_WITH_LEN(" ORDER BY "));
for (ORDER *ord= sel->order_list.first; ord; ord= ord->next)
{
if (ord != sel->order_list.first)
str->append(STRING_WITH_LEN(", "));
(*ord->item)->print(str, query_type);
}
}
if (sel->select_limit)
{
str->append(STRING_WITH_LEN(" LIMIT "));
sel->select_limit->print(str, query_type);
}
}
else
DBUG_ASSERT(0); // Not implemented yet
}
void st_select_lex_unit::print(String *str, enum_query_type query_type)
{
if (with_clause)

1
sql/sql_lex.h
View File

@@ -3264,6 +3264,7 @@ public:
void reset_arena_for_set_stmt(Query_arena *backup);
void free_arena_for_set_stmt();
void print(String *str, enum_query_type qtype);
List<Item_func_set_user_var> set_var_list; // in-query assignment list
List<Item_param> param_list;
List<LEX_CSTRING> view_list; // view list (list of field names in view)