Merge spetrunia@bk-internal.mysql.com:/home/bk/mysql-4.1

into mysql.com:/dbdata/psergey/mysql-4.1-ps-merge

mysql-test/r/ps.result

+drop table if exists t1,t2;
+create table t1
+(
+a int primary key,
+b char(10)
+);
+insert into t1 values (1,'one');
+insert into t1 values (2,'two');
+insert into t1 values (3,'three');
+insert into t1 values (4,'four');
+set @a=2;
+prepare stmt1 from 'select * from t1 where a <= ?';
+execute stmt1 using @a;
+a	b
+1	one
+2	two
+set @a=3;
+execute stmt1 using @a;
+a	b
+1	one
+2	two
+3	three
+deallocate prepare no_such_statement;
+ERROR HY000: Unknown prepared statement handler (no_such_statement) given to DEALLOCATE PREPARE
+execute stmt1;
+ERROR HY000: Wrong arguments to mysql_execute
+prepare stmt2 from 'prepare nested_stmt from "select 1"';
+ERROR 42000: You have an error in your SQL syntax.  Check the manual that corresponds to your MySQL server version for the right syntax to use near '"select 1"' at line 1
+prepare stmt2 from 'execute stmt1';
+ERROR 42000: You have an error in your SQL syntax.  Check the manual that corresponds to your MySQL server version for the right syntax to use near 'stmt1' at line 1
+prepare stmt2 from 'deallocate prepare z';
+ERROR 42000: You have an error in your SQL syntax.  Check the manual that corresponds to your MySQL server version for the right syntax to use near 'z' at line 1
+prepare stmt3 from 'insert into t1 values (?,?)';
+set @arg1=5, @arg2='five';
+execute stmt3 using @arg1, @arg2;
+select * from t1 where a>3;
+a	b
+4	four
+5	five
+prepare stmt4 from 'update t1 set a=? where b=?';
+set @arg1=55, @arg2='five';
+execute stmt4 using @arg1, @arg2;
+select * from t1 where a>3;
+a	b
+4	four
+55	five
+prepare stmt4 from 'create table t2 (a int)';
+execute stmt4;
+prepare stmt4 from 'drop table t2';
+execute stmt4;
+execute stmt4;
+ERROR 42S02: Unknown table 't2'
+prepare stmt5 from 'select ? + a from t1';
+set @a=1;
+execute stmt5 using @a;
+? + a
+2
+3
+4
+5
+56
+execute stmt5 using @no_such_var;
+? + a
+NULL
+NULL
+NULL
+NULL
+NULL
+set @nullvar=1;
+set @nullvar=NULL;
+execute stmt5 using @nullvar;
+? + a
+NULL
+NULL
+NULL
+NULL
+NULL
+set @nullvar2=NULL;
+execute stmt5 using @nullvar2;
+? + a
+NULL
+NULL
+NULL
+NULL
+NULL
+prepare stmt6 from 'select 1; select2';
+ERROR 42000: You have an error in your SQL syntax.  Check the manual that corresponds to your MySQL server version for the right syntax to use near '; select2' at line 1
+prepare stmt6 from 'insert into t1 values (5,"five"); select2';
+ERROR 42000: You have an error in your SQL syntax.  Check the manual that corresponds to your MySQL server version for the right syntax to use near '; select2' at line 1
+explain prepare stmt6 from 'insert into t1 values (5,"five"); select2';
+ERROR 42000: You have an error in your SQL syntax.  Check the manual that corresponds to your MySQL server version for the right syntax to use near 'from 'insert into t1 values (5,"five"); select2'' at line 1
+create table t2
+(
+a int
+);
+insert into t2 values (0);
+set @arg00=NULL ;
+prepare stmt1 from 'select 1 FROM t2 where a=?' ;
+execute stmt1 using @arg00 ;
+1
+prepare stmt1 from @nosuchvar;
+ERROR 42000: You have an error in your SQL syntax.  Check the manual that corresponds to your MySQL server version for the right syntax to use near 'NULL' at line 1
+set @ivar= 1234;
+prepare stmt1 from @ivar;
+ERROR 42000: You have an error in your SQL syntax.  Check the manual that corresponds to your MySQL server version for the right syntax to use near '1234' at line 1
+set @fvar= 123.4567;
+prepare stmt1 from @fvar;
+ERROR 42000: You have an error in your SQL syntax.  Check the manual that corresponds to your MySQL server version for the right syntax to use near '123.4567' at line 1
+set @str1 = 'select ?';
+set @str2 = convert(@str1 using ucs2);
+prepare stmt1 from @str2;
+execute stmt1 using @ivar;
+?
+1234
+drop table t1,t2;

mysql-test/t/ps.test

+#
+# SQL Syntax for Prepared Statements test
+#
+--disable_warnings
+drop table if exists t1,t2;
+--enable_warnings
+
+create table t1
+(
+  a int primary key,
+  b char(10)
+);
+insert into t1 values (1,'one');
+insert into t1 values (2,'two');
+insert into t1 values (3,'three');
+insert into t1 values (4,'four');
+
+# basic functionality
+set @a=2;
+prepare stmt1 from 'select * from t1 where a <= ?';
+execute stmt1 using @a;
+set @a=3;
+execute stmt1 using @a;
+
+# non-existant statement
+--error 1243
+deallocate prepare no_such_statement;
+
+--error 1210
+execute stmt1;
+
+# Nesting ps commands is not allowed: 
+--error 1064
+prepare stmt2 from 'prepare nested_stmt from "select 1"';
+
+--error 1064
+prepare stmt2 from 'execute stmt1';
+
+--error 1064
+prepare stmt2 from 'deallocate prepare z';
+
+# PS insert 
+prepare stmt3 from 'insert into t1 values (?,?)';
+set @arg1=5, @arg2='five';
+execute stmt3 using @arg1, @arg2;
+select * from t1 where a>3;
+
+# PS update 
+prepare stmt4 from 'update t1 set a=? where b=?';
+set @arg1=55, @arg2='five';
+execute stmt4 using @arg1, @arg2;
+select * from t1 where a>3;
+
+# PS create/delete
+prepare stmt4 from 'create table t2 (a int)';
+execute stmt4;
+prepare stmt4 from 'drop table t2';
+execute stmt4;
+
+# Do something that will cause error
+--error 1051
+execute stmt4;
+
+# placeholders in result field names.
+prepare stmt5 from 'select ? + a from t1';
+set @a=1;
+execute stmt5 using @a;
+
+execute stmt5 using @no_such_var;
+
+set @nullvar=1;
+set @nullvar=NULL;
+execute stmt5 using @nullvar;
+
+set @nullvar2=NULL;
+execute stmt5 using @nullvar2;
+
+# Check that multiple SQL statements are disabled inside PREPARE
+--error 1064
+prepare stmt6 from 'select 1; select2';
+
+--error 1064
+prepare stmt6 from 'insert into t1 values (5,"five"); select2';
+
+# This shouldn't parse
+--error 1064
+explain prepare stmt6 from 'insert into t1 values (5,"five"); select2';
+
+create table t2
+(
+  a int
+);
+
+insert into t2 values (0);
+
+# parameter is NULL
+set @arg00=NULL ;
+prepare stmt1 from 'select 1 FROM t2 where a=?' ;
+execute stmt1 using @arg00 ;
+
+# prepare using variables:
+--error 1064
+prepare stmt1 from @nosuchvar;
+
+set @ivar= 1234;
+--error 1064
+prepare stmt1 from @ivar;
+
+set @fvar= 123.4567;
+--error 1064
+prepare stmt1 from @fvar;
+
+set @str1 = 'select ?';
+set @str2 = convert(@str1 using ucs2);
+prepare stmt1 from @str2;
+execute stmt1 using @ivar;
+
+drop table t1,t2;
+

mysys/my_error.c

@@ -33,6 +33,12 @@ char NEAR errbuff[NRERRBUFFS][ERRMSGSIZE];
        nr	Errno
        MyFlags	Flags
        ...	variable list
+   NOTE
+    The following subset of printf format is supported:
+    "%[0-9.-]*l?[sdu]", where all length flags are parsed but ignored.
+
+    Additionally "%.*s" is supported and "%.*[ud]" is correctly parsed but 
+    length value is ignored.
 */
 
 int my_error(int nr,myf MyFlags, ...)
@@ -43,7 +49,10 @@ int my_error(int nr,myf MyFlags, ...)
   reg2 char	*endpos;
   char		* par;
   char		ebuff[ERRMSGSIZE+20];
+  int           prec_chars;
+  my_bool       prec_supplied;
   DBUG_ENTER("my_error");
+  LINT_INIT(prec_chars); /* protected by prec_supplied */
 
   va_start(ap,MyFlags);
   DBUG_PRINT("my", ("nr: %d  MyFlags: %d  errno: %d", nr, MyFlags, errno));
@@ -59,7 +68,6 @@ int my_error(int nr,myf MyFlags, ...)
     if (tpos[0] != '%')
     {
       *endpos++= *tpos++;	/* Copy ordinary char */
-      olen++;
       continue;
     }
     if (*++tpos == '%')		/* test if %% */
@@ -68,18 +76,45 @@ int my_error(int nr,myf MyFlags, ...)
     }
     else
     {
-      /* Skipp if max size is used (to be compatible with printf) */
-      while (my_isdigit(&my_charset_latin1, *tpos) || *tpos == '.' || *tpos == '-')
+      /* 
+        Skip size/precision flags to be compatible with printf. 
+        The only size/precision flag supported is "%.*s". 
+        "%.*u" and "%.*d" cause 
+      */
+      prec_supplied= 0;
+      if (*tpos== '.')
+      {
+        tpos++;
+        olen--;
+        if (*tpos == '*')
+        {
+          tpos++;
+          olen--;
+          prec_chars= va_arg(ap, int); /* get length parameter */
+          prec_supplied= 1;
+        }
+      }
+       
+      if (!prec_supplied)
+      {
+        while (my_isdigit(&my_charset_latin1, *tpos) || *tpos == '.' || 
+               *tpos == '-')
 	 tpos++;
+        
         if (*tpos == 'l')				/* Skipp 'l' argument */
 	  tpos++;
+      }
+
       if (*tpos == 's')				/* String parameter */
       {
 	par = va_arg(ap, char *);
 	plen = (uint) strlen(par);
+        if (prec_supplied && prec_chars > 0)
+          plen= min((uint)prec_chars, plen);
 	if (olen + plen < ERRMSGSIZE+2)		/* Replace if possible */
 	{
-	  endpos=strmov(endpos,par);
+          memcpy(endpos,par, plen);
+          endpos += plen;
           tpos++;
           olen+=plen-2;
           continue;

sql/item.cc

@@ -253,7 +253,7 @@ bool Item::get_time(TIME *ltime)
   return 0;
 }
 
-CHARSET_INFO * Item::default_charset() const
+CHARSET_INFO * Item::default_charset() 
 {
   return current_thd->variables.collation_connection;
 }
@@ -676,10 +676,10 @@ void Item_param::set_double(double value)
 }
 
 
-void Item_param::set_value(const char *str, uint length)
+void Item_param::set_value(const char *str, uint length, CHARSET_INFO *ci)
 {
   DBUG_ENTER("Item_param::set_value");
-  str_value.copy(str,length,default_charset());
+  str_value.copy(str,length,ci);
   item_type= STRING_ITEM;
   value_is_set= 1;
   maybe_null= 0;

sql/item.h

@@ -220,7 +220,7 @@ public:
   virtual Item *real_item() { return this; }
   virtual Item *get_tmp_table_item(THD *thd) { return copy_or_same(thd); }
 
-  CHARSET_INFO *default_charset() const;
+  static CHARSET_INFO *default_charset();
   virtual CHARSET_INFO *compare_collation() { return NULL; }
 
   virtual bool walk(Item_processor processor, byte *arg)
@@ -413,7 +413,7 @@ public:
   void set_null();
   void set_int(longlong i);
   void set_double(double i);
-  void set_value(const char *str, uint length);
+  void set_value(const char *str, uint length, CHARSET_INFO *ci);
   void set_long_str(const char *str, ulong length);
   void set_long_binary(const char *str, ulong length);
   void set_longdata(const char *str, ulong length);

sql/lex.h

@@ -133,6 +133,7 @@ static SYMBOL symbols[] = {
   { "DAY_MICROSECOND",	SYM(DAY_MICROSECOND_SYM)},
   { "DAY_MINUTE",	SYM(DAY_MINUTE_SYM)},
   { "DAY_SECOND",	SYM(DAY_SECOND_SYM)},
+  { "DEALLOCATE",       SYM(DEALLOCATE_SYM)},     
   { "DEC",		SYM(DECIMAL_SYM)},
   { "DECIMAL",		SYM(DECIMAL_SYM)},
   { "DEFAULT",		SYM(DEFAULT)},
@@ -324,6 +325,7 @@ static SYMBOL symbols[] = {
   { "POINT",		SYM(POINT_SYM)},
   { "POLYGON",		SYM(POLYGON)},
   { "PRECISION",	SYM(PRECISION)},
+  { "PREPARE",          SYM(PREPARE_SYM)},
   { "PREV",		SYM(PREV_SYM)},
   { "PRIMARY",		SYM(PRIMARY_SYM)},
   { "PRIVILEGES",	SYM(PRIVILEGES)},

sql/mysql_priv.h

@@ -634,8 +634,10 @@ int mysqld_show_column_types(THD *thd);
 int mysqld_help (THD *thd, const char *text);
 
 /* sql_prepare.cc */
-void mysql_stmt_prepare(THD *thd, char *packet, uint packet_length);
+int mysql_stmt_prepare(THD *thd, char *packet, uint packet_length, 
+                       LEX_STRING *name=NULL);
 void mysql_stmt_execute(THD *thd, char *packet, uint packet_length);
+void mysql_sql_stmt_execute(THD *thd, LEX_STRING *stmt_name);
 void mysql_stmt_free(THD *thd, char *packet);
 void mysql_stmt_reset(THD *thd, char *packet);
 void mysql_stmt_get_longdata(THD *thd, char *pos, ulong packet_length);

sql/mysqld.cc

@@ -4842,6 +4842,12 @@ struct show_var_st status_vars[]= {
   {"Com_unlock_tables",	       (char*) (com_stat+(uint) SQLCOM_UNLOCK_TABLES),SHOW_LONG},
   {"Com_update",	       (char*) (com_stat+(uint) SQLCOM_UPDATE),SHOW_LONG},
   {"Com_update_multi",	       (char*) (com_stat+(uint) SQLCOM_UPDATE_MULTI),SHOW_LONG},
+  {"Com_prepare_sql",          (char*) (com_stat+(uint) SQLCOM_PREPARE),
+   SHOW_LONG}, 
+  {"Com_execute_sql",          (char*) (com_stat+(uint) SQLCOM_EXECUTE), 
+   SHOW_LONG},
+  {"Com_dealloc_sql",          (char*) (com_stat+(uint) 
+                                        SQLCOM_DEALLOCATE_PREPARE), SHOW_LONG},
   {"Connections",              (char*) &thread_id,              SHOW_LONG_CONST},
   {"Created_tmp_disk_tables",  (char*) &created_tmp_disk_tables,SHOW_LONG},
   {"Created_tmp_files",	       (char*) &my_tmp_file_created,	SHOW_LONG},

sql/share/czech/errmsg.txt

@@ -255,7 +255,7 @@ character-set=latin2
 "Key reference and table reference doesn't match",
 "Operand should contain %d column(s)",
 "Subquery returns more than 1 row",
-"Unknown prepared statement handler (%ld) given to %s",
+"Unknown prepared statement handler (%.*s) given to %s",
 "Help database is corrupt or does not exist",
 "Cyclic reference on subqueries",
 "Converting column '%s' from %s to %s",

sql/share/dutch/errmsg.txt

@@ -257,7 +257,7 @@ character-set=latin1
 "Key reference and table reference doesn't match",
 "Operand should contain %d column(s)",
 "Subquery returns more than 1 row",
-"Unknown prepared statement handler (%ld) given to %s",
+"Unknown prepared statement handler (%.*s) given to %s",
 "Help database is corrupt or does not exist",
 "Cyclic reference on subqueries",
 "Converting column '%s' from %s to %s",

sql/share/english/errmsg.txt

@@ -246,7 +246,7 @@ character-set=latin1
 "Key reference and table reference doesn't match",
 "Operand should contain %d column(s)",
 "Subquery returns more than 1 row",
-"Unknown prepared statement handler (%ld) given to %s",
+"Unknown prepared statement handler (%.*s) given to %s",
 "Help database is corrupt or does not exist",
 "Cyclic reference on subqueries",
 "Converting column '%s' from %s to %s",

sql/share/estonian/errmsg.txt

@@ -251,7 +251,7 @@ character-set=latin7
 "Key reference and table reference doesn't match",
 "Operand should contain %d column(s)",
 "Subquery returns more than 1 row",
-"Unknown prepared statement handler (%ld) given to %s",
+"Unknown prepared statement handler (%.*s) given to %s",
 "Help database is corrupt or does not exist",
 "Cyclic reference on subqueries",
 "Converting column '%s' from %s to %s",

sql/share/french/errmsg.txt

@@ -246,7 +246,7 @@ character-set=latin1
 "Key reference and table reference doesn't match",
 "Operand should contain %d column(s)",
 "Subquery returns more than 1 row",
-"Unknown prepared statement handler (%ld) given to %s",
+"Unknown prepared statement handler (%.*s) given to %s",
 "Help database is corrupt or does not exist",
 "Cyclic reference on subqueries",
 "Converting column '%s' from %s to %s",

sql/share/german/errmsg.txt

@@ -258,7 +258,7 @@ character-set=latin1
 "Schlüssel- und Tabellenverweis passen nicht zusammen",
 "Operand solle %d Spalte(n) enthalten",
 "Unterabfrage lieferte mehr als einen Datensatz zurück",
-"Unbekannter Prepared-Statement-Handler (%ld) für %s angegeben",
+"Unbekannter Prepared-Statement-Handler (%.*s) für %s angegeben",
 "Die Hilfe-Datenbank ist beschädigt oder existiert nicht",
 "Zyklischer Verweis in Unterabfragen",
 "Spalte '%s' wird von %s nach %s umgewandelt",

sql/share/greek/errmsg.txt

@@ -246,7 +246,7 @@ character-set=greek
 "Key reference and table reference doesn't match",
 "Operand should contain %d column(s)",
 "Subquery returns more than 1 row",
-"Unknown prepared statement handler (%ld) given to %s",
+"Unknown prepared statement handler (%.*s) given to %s",
 "Help database is corrupt or does not exist",
 "Cyclic reference on subqueries",
 "Converting column '%s' from %s to %s",

sql/share/hungarian/errmsg.txt

@@ -248,7 +248,7 @@ character-set=latin2
 "Key reference and table reference doesn't match",
 "Operand should contain %d column(s)",
 "Subquery returns more than 1 row",
-"Unknown prepared statement handler (%ld) given to %s",
+"Unknown prepared statement handler (%.*s) given to %s",
 "Help database is corrupt or does not exist",
 "Cyclic reference on subqueries",
 "Converting column '%s' from %s to %s",

sql/share/italian/errmsg.txt

@@ -246,7 +246,7 @@ character-set=latin1
 "Key reference and table reference doesn't match",
 "Operand should contain %d column(s)",
 "Subquery returns more than 1 row",
-"Unknown prepared statement handler (%ld) given to %s",
+"Unknown prepared statement handler (%.*s) given to %s",
 "Help database is corrupt or does not exist",
 "Cyclic reference on subqueries",
 "Converting column '%s' from %s to %s",

sql/share/japanese/errmsg.txt

@@ -248,7 +248,7 @@ character-set=ujis
 "Key reference and table reference doesn't match",
 "Operand should contain %d column(s)",
 "Subquery returns more than 1 row",
-"Unknown prepared statement handler (%ld) given to %s",
+"Unknown prepared statement handler (%.*s) given to %s",
 "Help database is corrupt or does not exist",
 "Cyclic reference on subqueries",
 "Converting column '%s' from %s to %s",

sql/share/korean/errmsg.txt

@@ -246,7 +246,7 @@ character-set=euckr
 "Key reference and table reference doesn't match",
 "Operand should contain %d column(s)",
 "Subquery returns more than 1 row",
-"Unknown prepared statement handler (%ld) given to %s",
+"Unknown prepared statement handler (%.*s) given to %s",
 "Help database is corrupt or does not exist",
 "Cyclic reference on subqueries",
 "Converting column '%s' from %s to %s",

sql/share/norwegian-ny/errmsg.txt

@@ -248,7 +248,7 @@ character-set=latin1
 "Key reference and table reference doesn't match",
 "Operand should contain %d column(s)",
 "Subquery returns more than 1 row",
-"Unknown prepared statement handler (%ld) given to %s",
+"Unknown prepared statement handler (%.*s) given to %s",
 "Help database is corrupt or does not exist",
 "Cyclic reference on subqueries",
 "Converting column '%s' from %s to %s",

sql/share/norwegian/errmsg.txt

@@ -248,7 +248,7 @@ character-set=latin1
 "Key reference and table reference doesn't match",
 "Operand should contain %d column(s)",
 "Subquery returns more than 1 row",
-"Unknown prepared statement handler (%ld) given to %s",
+"Unknown prepared statement handler (%.*s) given to %s",
 "Help database is corrupt or does not exist",
 "Cyclic reference on subqueries",
 "Converting column '%s' from %s to %s",

sql/share/polish/errmsg.txt

@@ -250,7 +250,7 @@ character-set=latin2
 "Key reference and table reference doesn't match",
 "Operand should contain %d column(s)",
 "Subquery returns more than 1 row",
-"Unknown prepared statement handler (%ld) given to %s",
+"Unknown prepared statement handler (%.*s) given to %s",
 "Help database is corrupt or does not exist",
 "Cyclic reference on subqueries",
 "Converting column '%s' from %s to %s",

sql/share/portuguese/errmsg.txt

@@ -247,7 +247,7 @@ character-set=latin1
 "Referência da chave e referência da tabela não coincidem",
 "Operand should contain %d column(s)",
 "Subconsulta retorna mais que 1 registro",
-"Desconhecido manipulador de declaração preparado (%ld) determinado para %s",
+"Desconhecido manipulador de declaração preparado (%.*s) determinado para %s",
 "Banco de dado de ajuda corrupto ou não existente",
 "Referência cíclica em subconsultas",
 "Convertendo coluna '%s' de %s para %s",

sql/share/romanian/errmsg.txt

@@ -250,7 +250,7 @@ character-set=latin2
 "Key reference and table reference doesn't match",
 "Operand should contain %d column(s)",
 "Subquery returns more than 1 row",
-"Unknown prepared statement handler (%ld) given to %s",
+"Unknown prepared statement handler (%.*s) given to %s",
 "Help database is corrupt or does not exist",
 "Cyclic reference on subqueries",
 "Converting column '%s' from %s to %s",

sql/share/russian/errmsg.txt

@@ -248,7 +248,7 @@ character-set=koi8r
 "Key reference and table reference doesn't match",
 "   %d ",
 "    ",
-"Unknown prepared statement handler (%ld) given to %s",
+"Unknown prepared statement handler (%.*s) given to %s",
 "Help database is corrupt or does not exist",
 "   ",
 "  '%s'  %s  %s",

sql/share/slovak/errmsg.txt

@@ -254,7 +254,7 @@ character-set=latin2
 "Key reference and table reference doesn't match",
 "Operand should contain %d column(s)",
 "Subquery returns more than 1 row",
-"Unknown prepared statement handler (%ld) given to %s",
+"Unknown prepared statement handler (%.*s) given to %s",
 "Help database is corrupt or does not exist",
 "Cyclic reference on subqueries",
 "Converting column '%s' from %s to %s",

sql/share/spanish/errmsg.txt

@@ -248,7 +248,7 @@ character-set=latin1
 "Referencia de llave y referencia de tabla no coinciden",
 "Operando debe tener %d columna(s)",
 "Subconsulta retorna mas que 1 línea",
-"Desconocido preparado comando handler (%ld) dado para %s",
+"Desconocido preparado comando handler (%.*s) dado para %s",
 "Base de datos Help está corrupto o no existe",
 "Cíclica referencia en subconsultas",
 "Convirtiendo columna '%s' de %s para %s",

sql/share/swedish/errmsg.txt

@@ -246,7 +246,7 @@ character-set=latin1
 "Nyckelreferensen och tabellreferensen stämmer inte överens",
 "Operand should contain %d column(s)",
 "Subquery returnerade mer än 1 rad",
-"Okänd PREPARED STATEMENT id (%ld) var given till %s",
+"Okänd PREPARED STATEMENT id (%.*s) var given till %s",
 "Hjälpdatabasen finns inte eller är skadad",
 "Cyklisk referens i subqueries",
 "Konvertar kolumn '%s' från %s till %s",

sql/share/ukrainian/errmsg.txt

@@ -251,7 +251,7 @@ character-set=koi8u
 "Key reference and table reference doesn't match",
 "    %d æ",
 "  ¦ i 1 ",
-"Unknown prepared statement handler (%ld) given to %s",
+"Unknown prepared statement handler (%.*s) given to %s",
 "Help database is corrupt or does not exist",
 "̦   Ц",
 "  '%s'  %s  %s",

sql/sql_class.cc

@@ -78,7 +78,6 @@ extern "C" void free_user_var(user_var_entry *entry)
   my_free((char*) entry,MYF(0));
 }
 
-
 bool key_part_spec::operator==(const key_part_spec& other) const
 {
   return length == other.length && !strcmp(field_name, other.field_name);
@@ -1272,6 +1271,7 @@ Statement::Statement(THD *thd)
   query_length(0),
   free_list(0)
 {
+  name.str= NULL;
   init_sql_alloc(&mem_root,
                  thd->variables.query_alloc_block_size,
                  thd->variables.query_prealloc_size);
@@ -1355,17 +1355,52 @@ static void delete_statement_as_hash_key(void *key)
   delete (Statement *) key;
 }
 
+static byte *get_stmt_name_hash_key(Statement *entry, uint *length,
+                                    my_bool not_used __attribute__((unused)))
+{
+  *length=(uint) entry->name.length;
+  return (byte*) entry->name.str;
+}
+
 C_MODE_END
 
 Statement_map::Statement_map() :
   last_found_statement(0)
 {
-  enum { START_HASH_SIZE = 16 };
-  hash_init(&st_hash, default_charset_info, START_HASH_SIZE, 0, 0,
+  enum
+  {
+    START_STMT_HASH_SIZE = 16,
+    START_NAME_HASH_SIZE = 16
+  };
+  hash_init(&st_hash, default_charset_info, START_STMT_HASH_SIZE, 0, 0,
             get_statement_id_as_hash_key,
             delete_statement_as_hash_key, MYF(0));
+  hash_init(&names_hash, &my_charset_bin, START_NAME_HASH_SIZE, 0, 0,
+            (hash_get_key) get_stmt_name_hash_key,
+            NULL,MYF(0));
 }
 
+int Statement_map::insert(Statement *statement)
+{
+  int rc= my_hash_insert(&st_hash, (byte *) statement);
+  if (rc == 0)
+    last_found_statement= statement;
+  if (statement->name.str)
+  {
+    /*
+      If there is a statement with the same name, remove it. It is ok to 
+      remove old and fail to insert new one at the same time.
+    */
+    Statement *old_stmt;
+    if ((old_stmt= find_by_name(&statement->name)))
+      erase(old_stmt); 
+    if ((rc= my_hash_insert(&names_hash, (byte*)statement)))
+      hash_delete(&st_hash, (byte*)statement);
+  }
+  return rc;
+}
+
+
 bool select_dumpvar::send_data(List<Item> &items)
 {
   List_iterator_fast<Item_func_set_user_var> li(vars);

sql/sql_class.h

@@ -461,6 +461,7 @@ public:
   */
   bool allow_sum_func;
 
+  LEX_STRING name; /* name for named prepared statements */
   LEX *lex;                                     // parse tree descriptor
   /*
     Points to the query associated with this statement. It's const, but
@@ -527,8 +528,14 @@ public:
 
 
 /*
-  Used to seek all existing statements in the connection
-  Deletes all statements in destructor.
+  Container for all statements created/used in a connection.
+  Statements in Statement_map have unique Statement::id (guaranteed by id
+  assignment in Statement::Statement)
+  Non-empty statement names are unique too: attempt to insert a new statement
+  with duplicate name causes older statement to be deleted
+  
+  Statements are auto-deleted when they are removed from the map and when the
+  map is deleted.
 */
 
 class Statement_map
@@ -536,34 +543,47 @@ class Statement_map
 public:
   Statement_map();
   
-  int insert(Statement *statement)
+  int insert(Statement *statement);
+
+  Statement *find_by_name(LEX_STRING *name)
   {
-    int rc= my_hash_insert(&st_hash, (byte *) statement);
-    if (rc == 0)
-      last_found_statement= statement;
-    return rc;
+    Statement *stmt;
+    stmt= (Statement*)hash_search(&names_hash, (byte*)name->str,
+                                  name->length);
+    return stmt;
   }
 
   Statement *find(ulong id)
   {
     if (last_found_statement == 0 || id != last_found_statement->id)
-      last_found_statement= (Statement *) hash_search(&st_hash, (byte *) &id,
-                                                      sizeof(id));
+    {
+      Statement *stmt;
+      stmt= (Statement *) hash_search(&st_hash, (byte *) &id, sizeof(id));
+      if (stmt->name.str)
+        return NULL;
+      last_found_statement= stmt;
+    }
     return last_found_statement;
   }
   void erase(Statement *statement)
   {
     if (statement == last_found_statement)
       last_found_statement= 0;
+    if (statement->name.str)
+    {
+      hash_delete(&names_hash, (byte *) statement);  
+    }
     hash_delete(&st_hash, (byte *) statement);
   }
 
   ~Statement_map()
   {
     hash_free(&st_hash);
+    hash_free(&names_hash);
   }
 private:
   HASH st_hash;
+  HASH names_hash;
   Statement *last_found_statement;
 };
 

sql/sql_lex.h

@@ -76,6 +76,7 @@ enum enum_sql_command {
   SQLCOM_SHOW_COLUMN_TYPES, SQLCOM_SHOW_STORAGE_ENGINES, SQLCOM_SHOW_PRIVILEGES,
   SQLCOM_HELP, SQLCOM_DROP_USER, SQLCOM_REVOKE_ALL, SQLCOM_CHECKSUM,
 
+  SQLCOM_PREPARE, SQLCOM_EXECUTE, SQLCOM_DEALLOCATE_PREPARE,
   /* This should be the last !!! */
   SQLCOM_END
 };
@@ -606,6 +607,17 @@ typedef struct st_lex
   bool in_comment, ignore_space, verbose, simple_alter, no_write_to_binlog;
   bool derived_tables;
   bool safe_to_cache_query;
+  /* Prepared statements SQL syntax:*/
+  LEX_STRING prepared_stmt_name; /* Statement name (in all queries) */
+  /* 
+    Prepared statement query text or name of variable that holds the
+    prepared statement (in PREPARE ... queries)
+  */
+  LEX_STRING prepared_stmt_code; 
+  /* If true, prepared_stmt_code is a name of variable that holds the query */
+  bool prepared_stmt_code_is_varref;
+  /* Names of user variables holding parameters (in EXECUTE) */
+  List<LEX_STRING> prepared_stmt_params; 
   st_lex() {}
   inline void uncacheable(uint8 cause)
   {

sql/sql_parse.cc

@@ -1424,7 +1424,6 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
   }
   case COM_EXECUTE:
   {
-    thd->free_list= NULL;
     mysql_stmt_execute(thd, packet, packet_length);
     break;
   }
@@ -1973,7 +1972,125 @@ mysql_execute_command(THD *thd)
     }
     break;
   }
+  case SQLCOM_PREPARE:
+  {   
+    char *query_str;
+    uint query_len;
+    if (lex->prepared_stmt_code_is_varref)
+    {
+      /* This is PREPARE stmt FROM @var*/
+      String str;
+      CHARSET_INFO *to_cs= thd->variables.collation_connection;
+      CHARSET_INFO *from_cs;
+      const char *buf;
+      uint  buf_len;
+      bool need_conversion;
+      //// psergey: find the variable and convert it.
+      LINT_INIT(from_cs);
+      user_var_entry *entry;
+      uint32 unused;
+      if ((entry= 
+             (user_var_entry*)hash_search(&thd->user_vars, 
+                                          (byte*)lex->prepared_stmt_code.str,
+                                          lex->prepared_stmt_code.length))
+          && entry->value)
+      {
+        switch (entry->type)
+        {
+          case REAL_RESULT:
+            str.set(*(double*)entry->value, NOT_FIXED_DEC, to_cs);
+            buf_len= str.length();
+            buf= str.ptr();
+            need_conversion= false;
+            break;
+          case INT_RESULT:
+            str.set(*(longlong*)entry->value, to_cs);
+            buf_len= str.length();
+            buf= str.ptr();
+            need_conversion= false;
+            break;
+          case STRING_RESULT:
+            buf_len= entry->length;
+            buf= entry->value;
+            from_cs = entry->collation.collation;
+            need_conversion= String::needs_conversion(entry->length, from_cs,
+                                                      to_cs, &unused);
+            break;
+          default:
+            buf= "";
+            need_conversion= false;
+            buf_len= 0;
+            DBUG_ASSERT(0);
+        }
+      }
+      else
+      {
+        from_cs= &my_charset_bin;
+        str.set("NULL", 4, from_cs);
+        buf= str.ptr();
+        buf_len= str.length();
+        need_conversion= String::needs_conversion(str.length(), from_cs,
+                                                  to_cs, &unused);
+      }
+       
+      query_len = need_conversion? (buf_len* to_cs->mbmaxlen) : buf_len;
+      if (!(query_str= alloc_root(&thd->mem_root, query_len+1)))
+      {
+        send_error(thd, ER_OUT_OF_RESOURCES);
+      }              
       
+      if (need_conversion)
+        query_len= copy_and_convert(query_str, query_len, to_cs, buf, buf_len,
+                                    from_cs);
+      else
+        memcpy(query_str, buf, query_len);
+      query_str[query_len] = 0;
+    }
+    else
+    {
+      DBUG_PRINT("info", ("PREPARE: %.*s FROM '%.*s' \n", 
+                          lex->prepared_stmt_name.length,
+                          lex->prepared_stmt_name.str,
+                          lex->prepared_stmt_code.length,
+                          lex->prepared_stmt_code.str));
+      query_str= lex->prepared_stmt_code.str;
+      query_len= lex->prepared_stmt_code.length + 1;
+    }
+    thd->command= COM_PREPARE;
+    if (!mysql_stmt_prepare(thd, query_str, query_len + 1, 
+                            &lex->prepared_stmt_name))    
+      send_ok(thd, 0L, 0L, "Statement prepared");
+    break;
+  }
+  case SQLCOM_EXECUTE:
+  {
+    DBUG_PRINT("info", ("EXECUTE: %.*s\n", 
+                        lex->prepared_stmt_name.length,
+                        lex->prepared_stmt_name.str));
+    mysql_sql_stmt_execute(thd, &lex->prepared_stmt_name);
+    lex->prepared_stmt_params.empty();
+    break;
+  }
+  case SQLCOM_DEALLOCATE_PREPARE:
+  {
+    Statement* stmt;
+    DBUG_PRINT("info", ("DEALLOCATE PREPARE: %.*s\n", 
+                        lex->prepared_stmt_name.length,
+                        lex->prepared_stmt_name.str));
+    if ((stmt= thd->stmt_map.find_by_name(&lex->prepared_stmt_name)))
+    {
+      thd->stmt_map.erase(stmt);
+      send_ok(thd);
+    }
+    else
+    {
+      res= -1;
+      my_error(ER_UNKNOWN_STMT_HANDLER, MYF(0),
+               lex->prepared_stmt_name.length, lex->prepared_stmt_name.str,
+               "DEALLOCATE PREPARE");
+    }
+    break;
+  }
   case SQLCOM_DO:
     if (tables && ((res= check_table_access(thd, SELECT_ACL, tables,0)) ||
 		   (res= open_and_lock_tables(thd,tables))))

sql/sql_yacc.yy

@@ -432,6 +432,8 @@ bool my_yyoverflow(short **a, YYSTYPE **b,int *yystacksize);
 %token	MEDIUMTEXT
 %token	NUMERIC_SYM
 %token	PRECISION
+%token  PREPARE_SYM
+%token  DEALLOCATE_SYM
 %token	QUICK
 %token	REAL
 %token	SIGNED_SYM
@@ -724,6 +726,7 @@ bool my_yyoverflow(short **a, YYSTYPE **b,int *yystacksize);
 	precision subselect_start opt_and charset
 	subselect_end select_var_list select_var_list_init help opt_len
 	opt_extended_describe
+        prepare prepare_src execute deallocate 
 END_OF_INPUT
 
 %type <NONE>
@@ -760,10 +763,12 @@ verb_clause:
 	| checksum
 	| commit
 	| create
+        | deallocate 
 	| delete
 	| describe
 	| do
 	| drop
+        | execute 
 	| flush
 	| grant
 	| handler
@@ -775,6 +780,7 @@ verb_clause:
 	| optimize
         | keycache
 	| preload
+        | prepare 
 	| purge
 	| rename
 	| repair
@@ -795,6 +801,86 @@ verb_clause:
 	| use
         ;
 
+deallocate:
+        DEALLOCATE_SYM PREPARE_SYM ident 
+        {
+          THD *thd=YYTHD;
+          LEX *lex= thd->lex;
+          if (thd->command == COM_PREPARE)
+          {
+            yyerror(ER(ER_SYNTAX_ERROR));
+            YYABORT;
+          }
+          lex->sql_command= SQLCOM_DEALLOCATE_PREPARE;
+          lex->prepared_stmt_name= $3;
+        };
+
+prepare:
+        PREPARE_SYM ident FROM prepare_src
+        {
+          THD *thd=YYTHD;
+          LEX *lex= thd->lex;
+          if (thd->command == COM_PREPARE)
+          {
+            yyerror(ER(ER_SYNTAX_ERROR));
+            YYABORT;
+          }
+          lex->sql_command= SQLCOM_PREPARE;
+          lex->prepared_stmt_name= $2;
+        };
+
+prepare_src:
+        TEXT_STRING_sys
+        {
+          THD *thd=YYTHD;
+          LEX *lex= thd->lex;
+          lex->prepared_stmt_code= $1;
+          lex->prepared_stmt_code_is_varref= false;
+        }
+        | '@' ident_or_text
+        {
+          THD *thd=YYTHD;
+          LEX *lex= thd->lex;
+          lex->prepared_stmt_code= $2;
+          lex->prepared_stmt_code_is_varref= true;
+        };
+        
+execute:
+        EXECUTE_SYM ident
+        {
+          THD *thd=YYTHD;
+          LEX *lex= thd->lex;
+          if (thd->command == COM_PREPARE)
+          {
+            yyerror(ER(ER_SYNTAX_ERROR));
+            YYABORT;
+          }
+          lex->sql_command= SQLCOM_EXECUTE;
+          lex->prepared_stmt_name= $2;
+        }
+        execute_using
+        {}
+        ;
+
+execute_using:
+        /* nothing */
+        | USING execute_var_list
+        ;
+
+execute_var_list:
+        execute_var_list ',' execute_var_ident
+        | execute_var_ident
+        ;
+
+execute_var_ident: '@' ident_or_text
+        {
+          LEX *lex=Lex;
+          LEX_STRING *lexstr= (LEX_STRING*)sql_memdup(&$2, sizeof(LEX_STRING));
+          if (!lexstr || lex->prepared_stmt_params.push_back(lexstr))
+              YYABORT;
+        }
+        ;
+
 /* help */
 
 help:
@@ -4925,6 +5011,7 @@ keyword:
 	| DATETIME		{}
 	| DATE_SYM		{}
 	| DAY_SYM		{}
+        | DEALLOCATE_SYM        {}
 	| DELAY_KEY_WRITE_SYM	{}
 	| DES_KEY_FILE		{}
 	| DIRECTORY_SYM		{}
@@ -5022,6 +5109,7 @@ keyword:
 	| PASSWORD		{}
 	| POINT_SYM		{}
 	| POLYGON		{}
+        | PREPARE_SYM           {}
 	| PREV_SYM		{}
 	| PROCESS		{}
 	| PROCESSLIST_SYM	{}