SCRUM

Prepared statements in embedded server
Several changes in library code with two goals:
to make mysql_prepare_stmt working in embedded server
to get rid of #define mysql_interface_func mysql->methods->interface_func
in user's interface

include/mysql.h

@@ -250,7 +250,6 @@ typedef struct st_mysql
 
   LIST  *stmts;                     /* list of all statements */
   const struct st_mysql_methods *methods;
-  struct st_mysql_res *result;
   void *thd;
 } MYSQL;
 
@@ -359,6 +358,8 @@ int		STDCALL mysql_send_query(MYSQL *mysql, const char *q,
 					 unsigned long length);
 int		STDCALL mysql_real_query(MYSQL *mysql, const char *q,
 					unsigned long length);
+MYSQL_RES *     STDCALL mysql_store_result(MYSQL *mysql);
+
 /* perform query on master */
 my_bool		STDCALL mysql_master_query(MYSQL *mysql, const char *q,
 					   unsigned long length);
@@ -427,6 +428,8 @@ MYSQL_FIELD_OFFSET STDCALL mysql_field_seek(MYSQL_RES *result,
 MYSQL_ROW	STDCALL mysql_fetch_row(MYSQL_RES *result);
 unsigned long * STDCALL mysql_fetch_lengths(MYSQL_RES *result);
 MYSQL_FIELD *	STDCALL mysql_fetch_field(MYSQL_RES *result);
+MYSQL_RES *     STDCALL mysql_list_fields(MYSQL *mysql, const char *table,
+					  const char *wild);
 unsigned long	STDCALL mysql_escape_string(char *to,const char *from,
 					    unsigned long from_length);
 unsigned long STDCALL mysql_real_escape_string(MYSQL *mysql,
@@ -538,9 +541,7 @@ typedef struct st_mysql_stmt
 
 
 #define mysql_read_query_result(mysql) (*(mysql)->methods->read_query_result)(mysql)
-#define mysql_store_result(mysql) (*(mysql)->methods->store_result)(mysql)
 #define mysql_use_result(mysql) (*(mysql)->methods->use_result)(mysql)
-#define mysql_list_fields(mysql, table, wild) (*(mysql)->methods->list_fields)(mysql, table, wild)
 
 typedef struct st_mysql_methods
 {
@@ -552,12 +553,12 @@ typedef struct st_mysql_methods
 				      const char *arg,
 				      unsigned long arg_length,
 				      my_bool skip_check);
-  MYSQL_RES * (STDCALL *store_result)(MYSQL *mysql);
+  MYSQL_DATA *(STDCALL *read_rows)(MYSQL *mysql,MYSQL_FIELD *mysql_fields,
+				   uint fields);
   MYSQL_RES * (STDCALL *use_result)(MYSQL *mysql);
   void (STDCALL *fetch_lengths)(unsigned long *to, 
 				MYSQL_ROW column, uint field_count);
-  MYSQL_RES * (STDCALL *list_fields)(MYSQL *mysql, const char *table,
-				       const char *wild);
+  MYSQL_FIELD * (STDCALL *list_fields)(MYSQL *mysql);
   my_bool (STDCALL *read_prepare_result)(MYSQL *mysql, MYSQL_STMT *stmt);
 } MYSQL_METHODS;
 

include/sql_common.h

@@ -28,8 +28,6 @@ my_ulonglong net_field_length_ll(uchar **packet);
 MYSQL_FIELD *unpack_fields(MYSQL_DATA *data,MEM_ROOT *alloc,uint fields,
 			   my_bool default_value, uint server_capabilities);
 void free_rows(MYSQL_DATA *cur);
-MYSQL_DATA *read_rows (MYSQL *mysql,MYSQL_FIELD *fields,
-		       uint field_count);
 my_bool mysql_autenticate(MYSQL *mysql, const char *passwd);
 void free_old_query(MYSQL *mysql);
 void end_server(MYSQL *mysql);

libmysql/client_settings.h

@@ -41,6 +41,16 @@ my_bool send_file_to_server(MYSQL *mysql, const char *filename);
 #define reset_sigpipe(mysql)
 #endif
 
-MYSQL_RES * STDCALL cli_list_fields(MYSQL *mysql, const char *table, const char *wild);
-my_bool cli_read_prepare_result(MYSQL *mysql, MYSQL_STMT *stmt);
+void mysql_read_default_options(struct st_mysql_options *options,
+				const char *filename,const char *group);
+MYSQL * STDCALL 
+cli_mysql_real_connect(MYSQL *mysql,const char *host, const char *user,
+		       const char *passwd, const char *db,
+		       uint port, const char *unix_socket,ulong client_flag);
 
+void STDCALL cli_mysql_close(MYSQL *mysql);
+
+MYSQL_FIELD * STDCALL cli_list_fields(MYSQL *mysql);
+my_bool STDCALL cli_read_prepare_result(MYSQL *mysql, MYSQL_STMT *stmt);
+MYSQL_DATA *cli_read_rows(MYSQL *mysql,MYSQL_FIELD *mysql_fields,
+			  uint fields);

libmysql/libmysql.c

@@ -973,6 +973,19 @@ mysql_list_tables(MYSQL *mysql, const char *wild)
   DBUG_RETURN (mysql_store_result(mysql));
 }
 
+MYSQL_FIELD * STDCALL cli_list_fields(MYSQL *mysql)
+{
+  MYSQL_DATA *query;
+  if (!(query= cli_read_rows(mysql,(MYSQL_FIELD*) 0, 
+			     protocol_41(mysql) ? 8 : 6)))
+    return NULL;
+
+  mysql->field_count= query->rows;
+  return unpack_fields(query,&mysql->field_alloc,
+		       query->rows, 1, mysql->server_capabilities);
+}
+
+
 /**************************************************************************
   List all fields in a table
   If wild is given then only the fields matching wild is returned
@@ -981,36 +994,29 @@ mysql_list_tables(MYSQL *mysql, const char *wild)
 **************************************************************************/
 
 MYSQL_RES * STDCALL
-cli_list_fields(MYSQL *mysql, const char *table, const char *wild)
+mysql_list_fields(MYSQL *mysql, const char *table, const char *wild)
 {
-  MYSQL_RES *result;
-  MYSQL_DATA *query;
+  MYSQL_RES   *result;
+  MYSQL_FIELD *fields;
   char	     buff[257],*end;
   DBUG_ENTER("mysql_list_fields");
   DBUG_PRINT("enter",("table: '%s'  wild: '%s'",table,wild ? wild : ""));
 
-  LINT_INIT(query);
-
   end=strmake(strmake(buff, table,128)+1,wild ? wild : "",128);
+  free_old_query(mysql);
   if (simple_command(mysql,COM_FIELD_LIST,buff,(ulong) (end-buff),1) ||
-      !(query = read_rows(mysql,(MYSQL_FIELD*) 0, 
-			  protocol_41(mysql) ? 8 : 6)))
+      !(fields= (*mysql->methods->list_fields)(mysql)))
     DBUG_RETURN(NULL);
 
-  free_old_query(mysql);
   if (!(result = (MYSQL_RES *) my_malloc(sizeof(MYSQL_RES),
 					 MYF(MY_WME | MY_ZEROFILL))))
-  {
-    free_rows(query);
     DBUG_RETURN(NULL);
-  }
+
   result->methods= mysql->methods;
   result->field_alloc=mysql->field_alloc;
   mysql->fields=0;
-  result->field_count = (uint) query->rows;
-  result->fields= unpack_fields(query,&result->field_alloc,
-				result->field_count, 1,
-				mysql->server_capabilities);
+  result->field_count = mysql->field_count;
+  result->fields= fields;
   result->eof=1;
   DBUG_RETURN(result);
 }
@@ -1031,8 +1037,8 @@ mysql_list_processes(MYSQL *mysql)
   free_old_query(mysql);
   pos=(uchar*) mysql->net.read_pos;
   field_count=(uint) net_field_length(&pos);
-  if (!(fields = read_rows(mysql,(MYSQL_FIELD*) 0,
-			   protocol_41(mysql) ? 7 : 5)))
+  if (!(fields = (*mysql->methods->read_rows)(mysql,(MYSQL_FIELD*) 0,
+					      protocol_41(mysql) ? 7 : 5)))
     DBUG_RETURN(NULL);
   if (!(mysql->fields=unpack_fields(fields,&mysql->field_alloc,field_count,0,
 				    mysql->server_capabilities)))
@@ -1569,7 +1575,7 @@ my_bool STDCALL cli_read_prepare_result(MYSQL *mysql, MYSQL_STMT *stmt)
   uint field_count;
   ulong length, param_count;
   MYSQL_DATA *fields_data;
-  DBUG_ENTER("cli_read_prepare_result");
+  DBUG_ENTER("read_prepare_result");
 
   mysql= mysql->last_used_con;
   if ((length= net_safe_read(mysql)) == packet_error)
@@ -1586,7 +1592,7 @@ my_bool STDCALL cli_read_prepare_result(MYSQL *mysql, MYSQL_STMT *stmt)
       mysql->server_status|= SERVER_STATUS_IN_TRANS;
 
     mysql->extra_info= net_field_length_ll(&pos);
-    if (!(fields_data= read_rows(mysql, (MYSQL_FIELD*) 0, 7)))
+    if (!(fields_data= (*mysql->methods->read_rows)(mysql,(MYSQL_FIELD*)0,7)))
       DBUG_RETURN(1);
     if (!(stmt->fields= unpack_fields(fields_data,&stmt->mem_root,
 				      field_count,0,
@@ -1638,17 +1644,17 @@ mysql_prepare(MYSQL  *mysql, const char *query, ulong length)
   }
 
   init_alloc_root(&stmt->mem_root,8192,0);
-  if ((*mysql->read_prepare_result)(mysql, stmt))
+  if ((*mysql->methods->read_prepare_result)(mysql, stmt))
   {
     stmt_close(stmt, 1);
     DBUG_RETURN(0);
   }
   if (!(stmt->params= (MYSQL_BIND *) alloc_root(&stmt->mem_root,
 						sizeof(MYSQL_BIND)*
-                                                (param_count + 
-                                                 field_count))))
+                                                (stmt->param_count + 
+                                                 stmt->field_count))))
     set_stmt_error(stmt, CR_OUT_OF_MEMORY, unknown_sqlstate);
-  stmt->bind= stmt->params + param_count;
+  stmt->bind= stmt->params + stmt->param_count;
 
   stmt->state= MY_ST_PREPARE;
   stmt->mysql= mysql;

libmysqld/embedded_priv.h

@@ -26,4 +26,7 @@ C_MODE_START
 extern void lib_connection_phase(NET *net, int phase);
 extern void init_embedded_mysql(MYSQL *mysql, int client_flag, char *db);
 extern void *create_embedded_thd(int client_flag, char *db);
+extern MYSQL_METHODS embedded_methods;
+void free_old_query(MYSQL *mysql);
+extern my_bool server_inited;
 C_MODE_END

libmysqld/lib_sql.cc

@@ -50,7 +50,7 @@ static bool check_user(THD *thd, enum_server_command command,
 char * get_mysql_home(){ return mysql_home;};
 char * get_mysql_real_data_home(){ return mysql_real_data_home;};
 
-my_bool STDCALL
+static my_bool STDCALL
 emb_advanced_command(MYSQL *mysql, enum enum_server_command command,
 		     const char *header, ulong header_length,
 		     const char *arg, ulong arg_length, my_bool skip_check)
@@ -94,6 +94,77 @@ emb_advanced_command(MYSQL *mysql, enum enum_server_command command,
   return result;
 }
 
+static MYSQL_DATA * STDCALL 
+emb_read_rows(MYSQL *mysql, MYSQL_FIELD *mysql_fields __attribute__((unused)),
+	      uint fields __attribute__((unused)))
+{
+  MYSQL_DATA *result= ((THD*)mysql->thd)->data;
+  if (!result)
+    return NULL;
+  *result->prev_ptr= NULL;
+  ((THD*)mysql->thd)->data= NULL;
+  return result;
+}
+
+static MYSQL_FIELD * STDCALL emb_list_fields(MYSQL *mysql)
+{
+  return mysql->fields;
+}
+
+static my_bool STDCALL emb_read_prepare_result(MYSQL *mysql, MYSQL_STMT *stmt)
+{
+  THD *thd= (THD*)mysql->thd;
+  stmt->stmt_id= thd->client_stmt_id;
+  stmt->param_count= thd->client_param_count;
+  stmt->field_count= mysql->field_count;
+
+  if (stmt->field_count != 0)
+  {
+    if (!(mysql->server_status & SERVER_STATUS_AUTOCOMMIT))
+      mysql->server_status|= SERVER_STATUS_IN_TRANS;
+
+    stmt->fields= mysql->fields;
+    stmt->mem_root= mysql->field_alloc;
+  }
+  return 0;
+}
+
+/**************************************************************************
+  Get column lengths of the current row
+  If one uses mysql_use_result, res->lengths contains the length information,
+  else the lengths are calculated from the offset between pointers.
+**************************************************************************/
+
+static void STDCALL emb_fetch_lengths(ulong *to, MYSQL_ROW column, uint field_count)
+{ 
+  MYSQL_ROW end;
+
+  for (end=column + field_count; column != end ; column++,to++)
+    *to= *column ? *(uint *)((*column) - sizeof(uint)) : 0;
+}
+
+static my_bool STDCALL emb_mysql_read_query_result(MYSQL *mysql)
+{
+  if (mysql->net.last_errno)
+    return -1;
+
+  if (mysql->field_count)
+    mysql->status=MYSQL_STATUS_GET_RESULT;
+
+  return 0;
+}
+
+MYSQL_METHODS embedded_methods= 
+{
+  emb_mysql_read_query_result,
+  emb_advanced_command,
+  emb_read_rows,
+  mysql_store_result,
+  emb_fetch_lengths, 
+  emb_list_fields,
+  emb_read_prepare_result
+};
+
 C_MODE_END
 
 void THD::clear_error()
@@ -334,6 +405,8 @@ void *create_embedded_thd(int client_flag, char *db)
   thd->master_access= ~NO_ACCESS;
   thd->net.query_cache_query= 0;
 
+  thd->data= 0;
+
   return thd;
 }
 
@@ -343,35 +416,29 @@ bool Protocol::send_fields(List<Item> *list, uint flag)
 {
   List_iterator_fast<Item> it(*list);
   Item                     *item;
-  MYSQL_FIELD              *field, *client_field;
+  MYSQL_FIELD              *client_field;
   MYSQL                    *mysql= thd->mysql;
+  MEM_ROOT                 *field_alloc;
   
   DBUG_ENTER("send_fields");
 
   field_count= list->elements;
-  if (!(mysql->result=(MYSQL_RES*) my_malloc(sizeof(MYSQL_RES)+
-				      sizeof(ulong) * (field_count + 1),
-				      MYF(MY_WME | MY_ZEROFILL))))
-    goto err;
-  mysql->result->lengths= (ulong *)(mysql->result + 1);
-
-  mysql->field_count=field_count;
-  alloc= &mysql->field_alloc;
-  field= (MYSQL_FIELD *)alloc_root(alloc, sizeof(MYSQL_FIELD) * field_count);
-  if (!field)
+  field_alloc= &mysql->field_alloc;
+  if (!(client_field= thd->mysql->fields= 
+	(MYSQL_FIELD *)alloc_root(field_alloc, 
+				  sizeof(MYSQL_FIELD) * field_count)))
     goto err;
 
-  client_field= field;
   while ((item= it++))
   {
     Send_field server_field;
     item->make_field(&server_field);
 
-    client_field->db=	  strdup_root(alloc, server_field.db_name);
-    client_field->table=  strdup_root(alloc, server_field.table_name);
-    client_field->name=   strdup_root(alloc, server_field.col_name);
-    client_field->org_table= strdup_root(alloc, server_field.org_table_name);
-    client_field->org_name=  strdup_root(alloc, server_field.org_col_name);
+    client_field->db=	  strdup_root(field_alloc, server_field.db_name);
+    client_field->table=  strdup_root(field_alloc, server_field.table_name);
+    client_field->name=   strdup_root(field_alloc, server_field.col_name);
+    client_field->org_table= strdup_root(field_alloc, server_field.org_table_name);
+    client_field->org_name=  strdup_root(field_alloc, server_field.org_col_name);
     client_field->length= server_field.length;
     client_field->type=   server_field.type;
     client_field->flags= server_field.flags;
@@ -392,31 +459,16 @@ bool Protocol::send_fields(List<Item> *list, uint flag)
       String tmp(buff, sizeof(buff), default_charset_info), *res;
 
       if (!(res=item->val_str(&tmp)))
-	client_field->def= strdup_root(alloc, "");
+	client_field->def= strdup_root(field_alloc, "");
       else
-	client_field->def= strdup_root(alloc, tmp.ptr());
+	client_field->def= strdup_root(field_alloc, tmp.ptr());
     }
     else
       client_field->def=0;
     client_field->max_length= 0;
     ++client_field;
   }
-  mysql->result->fields = field;
-
-  if (!(mysql->result->data= (MYSQL_DATA*) my_malloc(sizeof(MYSQL_DATA),
-				       MYF(MY_WME | MY_ZEROFILL))))
-    goto err;
-
-  init_alloc_root(&mysql->result->data->alloc,8192,0);	/* Assume rowlength < 8192 */
-  mysql->result->data->alloc.min_malloc=sizeof(MYSQL_ROWS);
-  mysql->result->data->rows=0;
-  mysql->result->data->fields=field_count;
-  mysql->result->field_count=field_count;
-  mysql->result->data->prev_ptr= &mysql->result->data->data;
-
-  mysql->result->field_alloc=	mysql->field_alloc;
-  mysql->result->current_field=0;
-  mysql->result->current_row=0;
+  thd->mysql->field_count= field_count;
 
   DBUG_RETURN(prepare_for_send(list));
  err:
@@ -456,13 +508,27 @@ send_eof(THD *thd, bool no_flush)
 
 void Protocol_simple::prepare_for_resend()
 {
-  MYSQL_ROWS               *cur;
-  MYSQL_DATA               *result= thd->mysql->result->data;
+  MYSQL_ROWS *cur;
+  MYSQL_DATA *data= thd->data;
 
   DBUG_ENTER("send_data");
 
-  alloc= &result->alloc;
-  result->rows++;
+  if (!data)
+  {
+    if (!(data= (MYSQL_DATA*) my_malloc(sizeof(MYSQL_DATA),
+					MYF(MY_WME | MY_ZEROFILL))))
+      goto err;
+    
+    alloc= &data->alloc;
+    init_alloc_root(alloc,8192,0);	/* Assume rowlength < 8192 */
+    alloc->min_malloc=sizeof(MYSQL_ROWS);
+    data->rows=0;
+    data->fields=field_count;
+    data->prev_ptr= &data->data;
+    thd->data= data;
+  }
+
+  data->rows++;
   if (!(cur= (MYSQL_ROWS *)alloc_root(alloc, sizeof(MYSQL_ROWS)+(field_count + 1) * sizeof(char *))))
   {
     my_error(ER_OUT_OF_RESOURCES,MYF(0));
@@ -470,11 +536,11 @@ void Protocol_simple::prepare_for_resend()
   }
   cur->data= (MYSQL_ROW)(((char *)cur) + sizeof(MYSQL_ROWS));
 
-  *result->prev_ptr= cur;
-  result->prev_ptr= &cur->next;
+  *data->prev_ptr= cur;
+  data->prev_ptr= &cur->next;
   next_field=cur->data;
-  next_mysql_field= thd->mysql->result->fields;
-
+  next_mysql_field= thd->mysql->fields;
+err:
   DBUG_VOID_RETURN;
 }
 

libmysqld/libmysqld.c

@@ -24,6 +24,7 @@
 #include <sys/stat.h>
 #include <signal.h>
 #include <time.h>
+#include "client_settings.h"
 #ifdef	 HAVE_PWD_H
 #include <pwd.h>
 #endif
@@ -58,29 +59,11 @@
 #define closesocket(A) close(A)
 #endif
 
-void free_old_query(MYSQL *mysql);
-my_bool STDCALL
-emb_advanced_command(MYSQL *mysql, enum enum_server_command command,
-		     const char *header, ulong header_length,
-		     const char *arg, ulong arg_length, my_bool skip_check);
-
-/* From client.c */
-void mysql_read_default_options(struct st_mysql_options *options,
-				const char *filename,const char *group);
-MYSQL * STDCALL 
-cli_mysql_real_connect(MYSQL *mysql,const char *host, const char *user,
-		       const char *passwd, const char *db,
-		       uint port, const char *unix_socket,ulong client_flag);
-
-void STDCALL cli_mysql_close(MYSQL *mysql);
-
 #ifdef HAVE_GETPWUID
 struct passwd *getpwuid(uid_t);
 char* getlogin(void);
 #endif
 
-extern char server_inited;
-
 #ifdef __WIN__
 static my_bool is_NT(void)
 {
@@ -165,77 +148,6 @@ static inline int mysql_init_charset(MYSQL *mysql)
   return 0;
 }
 
-/**************************************************************************
-  Get column lengths of the current row
-  If one uses mysql_use_result, res->lengths contains the length information,
-  else the lengths are calculated from the offset between pointers.
-**************************************************************************/
-
-static void STDCALL emb_fetch_lengths(ulong *to, MYSQL_ROW column, uint field_count)
-{ 
-  MYSQL_ROW end;
-
-  for (end=column + field_count; column != end ; column++,to++)
-    *to= *column ? *(uint *)((*column) - sizeof(uint)) : 0;
-}
-
-/**************************************************************************
-  List all fields in a table
-  If wild is given then only the fields matching wild is returned
-  Instead of this use query:
-  show fields in 'table' like "wild"
-**************************************************************************/
-
-static MYSQL_RES * STDCALL
-emb_list_fields(MYSQL *mysql, const char *table, const char *wild)
-{
-  MYSQL_RES *result;
-  MYSQL_DATA *query;
-  char	     buff[257],*end;
-  DBUG_ENTER("mysql_list_fields");
-  DBUG_PRINT("enter",("table: '%s'  wild: '%s'",table,wild ? wild : ""));
-
-  LINT_INIT(query);
-
-  end=strmake(strmake(buff, table,128)+1,wild ? wild : "",128);
-  if (simple_command(mysql,COM_FIELD_LIST,buff,(ulong) (end-buff),1))
-    DBUG_RETURN(NULL);
-
-  result= mysql->result;
-  if (!result)
-    return 0;
-  
-  result->methods= mysql->methods;
-  result->eof=1;
-
-  DBUG_RETURN(result);
-}
-
-my_bool STDCALL emb_read_prepare_result(MYSQL *mysql, MYSQL_STMT *stmt)
-{
-  stmt->fields= mysql->result->fields;
-  stmt->alloc;
-}
-
-/*
-** Note that the mysql argument must be initialized with mysql_init()
-** before calling mysql_real_connect !
-*/
-
-static my_bool STDCALL emb_mysql_read_query_result(MYSQL *mysql);
-static MYSQL_RES * STDCALL emb_mysql_store_result(MYSQL *mysql);
-static MYSQL_RES * STDCALL emb_mysql_use_result(MYSQL *mysql);
-
-static MYSQL_METHODS embedded_methods= 
-{
-  emb_mysql_read_query_result,
-  emb_advanced_command,
-  emb_mysql_store_result,
-  emb_mysql_use_result,
-  emb_fetch_lengths,
-  emb_list_fields
-};
-
 MYSQL * STDCALL
 mysql_real_connect(MYSQL *mysql,const char *host, const char *user,
 		   const char *passwd, const char *db,
@@ -383,58 +295,3 @@ void STDCALL mysql_close(MYSQL *mysql)
   DBUG_VOID_RETURN;
 }
 
-static my_bool STDCALL emb_mysql_read_query_result(MYSQL *mysql)
-{
-  if (mysql->net.last_errno)
-    return -1;
-
-  if (mysql->field_count)
-  {
-    mysql->status=MYSQL_STATUS_GET_RESULT;
-    mysql->affected_rows= mysql->result->row_count= mysql->result->data->rows;
-    mysql->result->data_cursor= mysql->result->data->data;
-  }
-
-  return 0;
-}
-
-/**************************************************************************
-** Alloc result struct for buffered results. All rows are read to buffer.
-** mysql_data_seek may be used.
-**************************************************************************/
-static MYSQL_RES * STDCALL emb_mysql_store_result(MYSQL *mysql)
-{
-  MYSQL_RES *result= mysql->result;
-  if (!result)
-    return 0;
-  
-  result->methods= mysql->methods;
-  mysql->result= NULL;
-  *result->data->prev_ptr= 0;
-  result->eof= 1;
-  result->lengths= (ulong*)(result + 1);
-  mysql->affected_rows= result->row_count= result->data->rows;
-  result->data_cursor=  result->data->data;
-
-  mysql->status=MYSQL_STATUS_READY;		/* server is ready */
-  return result;
-}
-
-/**************************************************************************
-** Alloc struct for use with unbuffered reads. Data is fetched by domand
-** when calling to mysql_fetch_row.
-** mysql_data_seek is a noop.
-**
-** No other queries may be specified with the same MYSQL handle.
-** There shouldn't be much processing per row because mysql server shouldn't
-** have to wait for the client (and will not wait more than 30 sec/packet).
-**************************************************************************/
-
-static MYSQL_RES * STDCALL emb_mysql_use_result(MYSQL *mysql)
-{
-  DBUG_ENTER("mysql_use_result");
-  if (mysql->options.separate_thread)
-    DBUG_RETURN(0);
-
-  DBUG_RETURN(emb_mysql_store_result(mysql));
-}

sql-common/client.c

@@ -1139,8 +1139,8 @@ unpack_fields(MYSQL_DATA *data,MEM_ROOT *alloc,uint fields,
 
 /* Read all rows (fields or data) from server */
 
-MYSQL_DATA *read_rows(MYSQL *mysql,MYSQL_FIELD *mysql_fields,
-			     uint fields)
+MYSQL_DATA *cli_read_rows(MYSQL *mysql,MYSQL_FIELD *mysql_fields,
+			  uint fields)
 {
   uint	field;
   ulong pkt_len;
@@ -1150,7 +1150,7 @@ MYSQL_DATA *read_rows(MYSQL *mysql,MYSQL_FIELD *mysql_fields,
   MYSQL_DATA *result;
   MYSQL_ROWS **prev_ptr,*cur;
   NET *net = &mysql->net;
-  DBUG_ENTER("read_rows");
+  DBUG_ENTER("cli_read_rows");
 
   if ((pkt_len= net_safe_read(mysql)) == packet_error)
     DBUG_RETURN(0);
@@ -1397,14 +1397,13 @@ mysql_ssl_free(MYSQL *mysql __attribute__((unused)))
 */
 
 static my_bool STDCALL cli_mysql_read_query_result(MYSQL *mysql);
-static MYSQL_RES * STDCALL cli_mysql_store_result(MYSQL *mysql);
 static MYSQL_RES * STDCALL cli_mysql_use_result(MYSQL *mysql);
 
 static MYSQL_METHODS client_methods=
 {
   cli_mysql_read_query_result,
   cli_advanced_command,
-  cli_mysql_store_result,
+  cli_read_rows,
   cli_mysql_use_result,
   cli_fetch_lengths,
   cli_list_fields,
@@ -2265,7 +2264,8 @@ static my_bool STDCALL cli_mysql_read_query_result(MYSQL *mysql)
 
   mysql->extra_info= net_field_length_ll(&pos); /* Maybe number of rec */
 
-  if (!(fields=read_rows(mysql,(MYSQL_FIELD*)0,protocol_41(mysql) ? 7 : 5)))
+  if (!(fields=(*mysql->methods->read_rows)(mysql,(MYSQL_FIELD*)0,
+					    protocol_41(mysql) ? 7 : 5)))
     DBUG_RETURN(1);
   if (!(mysql->fields=unpack_fields(fields,&mysql->field_alloc,
 				    (uint) field_count,0,
@@ -2327,7 +2327,7 @@ mysql_real_query(MYSQL *mysql, const char *query, ulong length)
   mysql_data_seek may be used.
 **************************************************************************/
 
-static MYSQL_RES * STDCALL cli_mysql_store_result(MYSQL *mysql)
+MYSQL_RES * STDCALL mysql_store_result(MYSQL *mysql)
 {
   MYSQL_RES *result;
   DBUG_ENTER("mysql_store_result");
@@ -2356,7 +2356,8 @@ static MYSQL_RES * STDCALL cli_mysql_store_result(MYSQL *mysql)
   result->methods= mysql->methods;
   result->eof=1;				/* Marker for buffered */
   result->lengths=(ulong*) (result+1);
-  if (!(result->data=read_rows(mysql,mysql->fields,mysql->field_count)))
+  if (!(result->data=
+	(*mysql->methods->read_rows)(mysql,mysql->fields,mysql->field_count)))
   {
     my_free((gptr) result,MYF(0));
     DBUG_RETURN(0);

sql/sql_class.h

@@ -419,6 +419,9 @@ class THD :public ilink
 public:
 #ifdef EMBEDDED_LIBRARY
   struct st_mysql  *mysql;
+  struct st_mysql_data *data;
+  unsigned long	 client_stmt_id;
+  unsigned long  client_param_count;
 #endif
   NET	  net;				// client connection descriptor
   LEX	  lex;				// parse tree descriptor

sql/sql_prepare.cc

@@ -156,13 +156,14 @@ static bool send_prep_stmt(PREP_STMT *stmt, uint columns)
   return (my_net_write(net, buff, sizeof(buff)) || net_flush(net));
 }
 #else
-static bool send_prep_stmt(PREP_STMT *stmt, uint columns)
+static bool send_prep_stmt(PREP_STMT *stmt, uint columns __attribute__((unused)))
 {
-  MYSQL_STMT *client_stmt= stmt->thd->client_stmt;
+  THD *thd= stmt->thd;
 
-  client_stmt->stmt_id= stmt->stmt_id;
-  client_stmt->field_count= columns;
-  client_stmt->param_count= stmt->param_count;
+  thd->client_stmt_id= stmt->stmt_id;
+  thd->client_param_count= stmt->param_count;
+
+  return 0;
 }
 #endif /*!EMBEDDED_LIBRAYR*/