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Port of cursors to be pushed into 5.0 tree:

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- client side part is simple and may be considered stable
- server side part now just joggles with THD state to save execution
  state and has no additional locking wisdom.
  Lot's of it are to be rewritten.
This commit is contained in:
konstantin@mysql.com
2004-08-03 03:32:21 -07:00
parent 7e6bade23b
commit d3e520ce7e
31 changed files with 1091 additions and 150 deletions
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26
sql/sql_class.h
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@@ -487,6 +487,9 @@ public:
void set_item_arena(Item_arena *set);
};
class Cursor;
/*
State of a single command executed against this connection.
One connection can contain a lot of simultaneously running statements,
@@ -543,6 +546,7 @@ public:
*/
char *query;
uint32 query_length; // current query length
Cursor *cursor;
public:
/* We build without RTTI, so dynamic_cast can't be used. */
@@ -1054,6 +1058,7 @@ public:
{
DBUG_ASSERT(current_arena!=0);
cleanup_items(current_arena->free_list);
/* no need to reset free_list as it won't be used anymore */
free_items(free_list);
close_thread_tables(this); // to close derived tables
free_root(&mem_root, MYF(0));
@@ -1108,7 +1113,7 @@ public:
unit= u;
return 0;
}
virtual bool send_fields(List<Item> &list,uint flag)=0;
virtual bool send_fields(List<Item> &list, uint flags)=0;
virtual bool send_data(List<Item> &items)=0;
virtual bool initialize_tables (JOIN *join=0) { return 0; }
virtual void send_error(uint errcode,const char *err);
@@ -1120,7 +1125,7 @@ public:
class select_send :public select_result {
public:
select_send() {}
bool send_fields(List<Item> &list,uint flag);
bool send_fields(List<Item> &list, uint flags);
bool send_data(List<Item> &items);
bool send_eof();
};
@@ -1138,7 +1143,7 @@ public:
select_to_file(sql_exchange *ex) :exchange(ex), file(-1),row_count(0L)
{ path[0]=0; }
~select_to_file();
bool send_fields(List<Item> &list, uint flag) { return 0; }
bool send_fields(List<Item> &list, uint flags) { return 0; }
void send_error(uint errcode,const char *err);
};
@@ -1185,8 +1190,7 @@ class select_insert :public select_result {
}
~select_insert();
int prepare(List<Item> &list, SELECT_LEX_UNIT *u);
bool send_fields(List<Item> &list, uint flag)
{ return 0; }
bool send_fields(List<Item> &list, uint flags) { return 0; }
bool send_data(List<Item> &items);
void send_error(uint errcode,const char *err);
bool send_eof();
@@ -1273,8 +1277,7 @@ class select_union :public select_result {
select_union(TABLE *table_par);
~select_union();
int prepare(List<Item> &list, SELECT_LEX_UNIT *u);
bool send_fields(List<Item> &list, uint flag)
{ return 0; }
bool send_fields(List<Item> &list, uint flags) { return 0; }
bool send_data(List<Item> &items);
bool send_eof();
bool flush();
@@ -1288,7 +1291,7 @@ protected:
Item_subselect *item;
public:
select_subselect(Item_subselect *item);
bool send_fields(List<Item> &list, uint flag) { return 0; };
bool send_fields(List<Item> &list, uint flags) { return 0; }
bool send_data(List<Item> &items)=0;
bool send_eof() { return 0; };
@@ -1457,8 +1460,7 @@ public:
multi_delete(THD *thd, TABLE_LIST *dt, uint num_of_tables);
~multi_delete();
int prepare(List<Item> &list, SELECT_LEX_UNIT *u);
bool send_fields(List<Item> &list,
uint flag) { return 0; }
bool send_fields(List<Item> &list, uint flags) { return 0; }
bool send_data(List<Item> &items);
bool initialize_tables (JOIN *join);
void send_error(uint errcode,const char *err);
@@ -1486,7 +1488,7 @@ public:
List<Item> *values, enum_duplicates handle_duplicates);
~multi_update();
int prepare(List<Item> &list, SELECT_LEX_UNIT *u);
bool send_fields(List<Item> &list, uint flag) { return 0; }
bool send_fields(List<Item> &list, uint flags) { return 0; }
bool send_data(List<Item> &items);
bool initialize_tables (JOIN *join);
void send_error(uint errcode,const char *err);
@@ -1515,7 +1517,7 @@ public:
select_dumpvar(void) { var_list.empty(); local_vars.empty(); vars.empty(); row_count=0;}
~select_dumpvar() {}
int prepare(List<Item> &list, SELECT_LEX_UNIT *u);
bool send_fields(List<Item> &list, uint flag) {return 0;}
bool send_fields(List<Item> &list, uint flags) { return 0; }
bool send_data(List<Item> &items);
bool send_eof();
};