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Proposed fix for Bug#4026 "Microseconds part of TIME/DATETIME types

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is broken (prepared statements)": fixed date handling in many places 
of prepared statements code.


libmysql/libmysql.c:
  Fix for Bug#4026:
  - now buffer_length is defined for any buffer type. Network buffer 
    preallocation cleaned up.
  - added constants for maximum buffer sizes necessary for MYSQL_TYPE_DATE,
    MYSQL_TYPE_TIME, MYSQL_TYPE_DATETIME types.
  - TIME/DATETIME packing/unpacking functions fixed 
  - now result set metadata is always updated from fields sent to COM_EXECUTE.
    This is necessary to make 'SELECT ?' queries work without conversions.
sql/item.cc:
  - added implementatoin of Item_param::get_date
sql/item.h:
  - added enum_field_types Item_param::param_type. First step for proper
    handling of placeholders.
  - added get_date() implementation to prevent date -> string -> date 
    conversions when MYSQL_TYPE_DATE/DATETIME parameter is used in temporal 
    context.
sql/protocol.cc:
  Fix for Bug#4026:
  - PACKET_BUFFET_EXTRA_ALLOC -> PACKET_BUFFER_EXTRA_ALLOC.
    The define itself was moved to .cc as it's used only in protocol.cc
  - fixed Protocol_prep::store_time() call.
sql/protocol.h:
  - PACKET_BUFFER_EXTRA_ALLOC moved to protocol.cc
sql/sql_prepare.cc:
  Fix for Bug#4026:
  - MYSQL_TYPE_TIME/DATETIME handling fixed.
  - added initialization for Item_param::param_type in 
    setup_one_conversion_function
tests/client_test.c:
  Test case for Bug#4026
This commit is contained in:
unknown
2004-06-09 03:21:50 +04:00
parent 5cc410bb70
commit 27eda71204
7 changed files with 214 additions and 56 deletions
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126
libmysql/libmysql.c
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@ -1667,6 +1667,27 @@ static int stmt_read_row_buffered(MYSQL_STMT *stmt, unsigned char **row);
static int stmt_read_row_no_data(MYSQL_STMT *stmt, unsigned char **row);
/*
Maximum sizes of MYSQL_TYPE_DATE, MYSQL_TYPE_TIME, MYSQL_TYPE_DATETIME
values stored in network buffer.
*/
/* 1 (length) + 2 (year) + 1 (month) + 1 (day) */
static const unsigned MAX_DATE_REP_LENGTH= 5;
/*
1 (length) + 1 (is negative) + 4 (day count) + 1 (hour)
+ 1 (minute) + 1 (seconds) + 4 (microseconds)
*/
static const unsigned MAX_TIME_REP_LENGTH= 13;
/*
1 (length) + 2 (year) + 1 (month) + 1 (day) +
1 (hour) + 1 (minute) + 1 (second) + 4 (microseconds)
*/
static const unsigned MAX_DATETIME_REP_LENGTH= 12;
/**************** Misc utility functions ****************************/
/*
@ -2030,6 +2051,30 @@ static unsigned int alloc_stmt_fields(MYSQL_STMT *stmt)
return stmt->field_count;
}
/*
Update result set columns metadata if it was sent again in
reply to COM_EXECUTE.
*/
static void update_stmt_fields(MYSQL_STMT *stmt)
{
MYSQL_FIELD *field= stmt->mysql->fields;
MYSQL_FIELD *field_end= field + stmt->field_count;
MYSQL_FIELD *stmt_field= stmt->fields;
DBUG_ASSERT(stmt->field_count == stmt->mysql->field_count);
for (; field < field_end; ++field, ++stmt_field)
{
stmt_field->charsetnr= field->charsetnr;
stmt_field->length = field->length;
stmt_field->type = field->type;
stmt_field->flags = field->flags;
stmt_field->decimals = field->decimals;
}
}
/*
Returns prepared statement metadata in the form of a result set.
@ -2166,7 +2211,7 @@ static void store_param_double(NET *net, MYSQL_BIND *param)
static void store_param_time(NET *net, MYSQL_BIND *param)
{
MYSQL_TIME *tm= (MYSQL_TIME *) param->buffer;
char buff[15], *pos;
char buff[MAX_TIME_REP_LENGTH], *pos;
uint length;
pos= buff+1;
@ -2177,19 +2222,19 @@ static void store_param_time(NET *net, MYSQL_BIND *param)
pos[7]= (uchar) tm->second;
int4store(pos+8, tm->second_part);
if (tm->second_part)
length= 11;
length= 12;
else if (tm->hour || tm->minute || tm->second || tm->day)
length= 8;
else
length= 0;
buff[0]= (char) length++;
buff[0]= (char) length++;
memcpy((char *)net->write_pos, buff, length);
net->write_pos+= length;
}
static void net_store_datetime(NET *net, MYSQL_TIME *tm)
{
char buff[12], *pos;
char buff[MAX_DATETIME_REP_LENGTH], *pos;
uint length;
pos= buff+1;
@ -2280,7 +2325,7 @@ static my_bool store_param(MYSQL_STMT *stmt, MYSQL_BIND *param)
Param->length should ALWAYS point to the correct length for the type
Either to the length pointer given by the user or param->buffer_length
*/
if ((my_realloc_str(net, 9 + *param->length)))
if ((my_realloc_str(net, *param->length)))
{
set_stmt_error(stmt, CR_OUT_OF_MEMORY, unknown_sqlstate);
DBUG_RETURN(1);
@ -2557,16 +2602,37 @@ int STDCALL mysql_stmt_execute(MYSQL_STMT *stmt)
*/
if (mysql->methods->stmt_execute(stmt))
DBUG_RETURN(1);
if (!stmt->field_count && mysql->field_count)
if (mysql->field_count)
{
/*
This is 'SHOW'/'EXPLAIN'-like query. Current implementation of
prepared statements can't send result set metadata for this queries
on prepare stage. Read it now.
*/
alloc_stmt_fields(stmt);
/* Server has sent result set metadata */
if (stmt->field_count == 0)
{
/*
This is 'SHOW'/'EXPLAIN'-like query. Current implementation of
prepared statements can't send result set metadata for these queries
on prepare stage. Read it now.
*/
alloc_stmt_fields(stmt);
}
else
{
/*
Update result set metadata if it for some reason changed between
prepare and execute, i.e.:
- in case of 'SELECT ?' we don't know column type unless data was
supplied to mysql_stmt_execute, so updated column type is sent
now.
- if data dictionary changed between prepare and execute, for
example a table used in the query was altered.
Note, that now (4.1.3) we always send metadata in reply to
COM_EXECUTE (even if it is not necessary), so either this or
previous always branch works.
TODO: send metadata only when it's really necessary and add a warning
'Metadata changed' when it's sent twice.
*/
update_stmt_fields(stmt);
}
}
stmt->state= MYSQL_STMT_EXECUTE_DONE;
if (stmt->field_count)
{
@ -2693,15 +2759,17 @@ my_bool STDCALL mysql_stmt_bind_param(MYSQL_STMT *stmt, MYSQL_BIND * bind)
param->store_param_func= store_param_double;
break;
case MYSQL_TYPE_TIME:
/* Buffer length ignored for DATE, TIME and DATETIME */
param->store_param_func= store_param_time;
param->buffer_length= MAX_TIME_REP_LENGTH;
break;
case MYSQL_TYPE_DATE:
param->store_param_func= store_param_date;
param->buffer_length= MAX_DATE_REP_LENGTH;
break;
case MYSQL_TYPE_DATETIME:
case MYSQL_TYPE_TIMESTAMP:
param->store_param_func= store_param_datetime;
param->buffer_length= MAX_DATETIME_REP_LENGTH;
break;
case MYSQL_TYPE_TINY_BLOB:
case MYSQL_TYPE_MEDIUM_BLOB:
@ -2859,17 +2927,17 @@ static uint read_binary_time(MYSQL_TIME *tm, uchar **pos)
set_zero_time(tm);
return 0;
}
to= *pos;
tm->second_part= (length > 8 ) ? (ulong) sint4korr(to+7): 0;
to= *pos;
tm->neg= (bool) to[0];
tm->day= (ulong) sint4korr(to+1);
tm->hour= (uint) to[5];
tm->minute= (uint) to[6];
tm->second= (uint) to[7];
tm->second_part= (length > 8) ? (ulong) sint4korr(to+8) : 0;
tm->year= tm->month= 0;
tm->neg= (bool)to[0];
return length;
}
@ -2878,16 +2946,20 @@ static uint read_binary_datetime(MYSQL_TIME *tm, uchar **pos)
{
uchar *to;
uint length;
if (!(length= net_field_length(pos)))
{
set_zero_time(tm);
return 0;
}
to= *pos;
tm->second_part= (length > 7 ) ? (ulong) sint4korr(to+7): 0;
to= *pos;
tm->neg= 0;
tm->year= (uint) sint2korr(to);
tm->month= (uint) to[2];
tm->day= (uint) to[3];
if (length > 4)
{
tm->hour= (uint) to[4];
@ -2896,11 +2968,7 @@ static uint read_binary_datetime(MYSQL_TIME *tm, uchar **pos)
}
else
tm->hour= tm->minute= tm->second= 0;
tm->year= (uint) sint2korr(to);
tm->month= (uint) to[2];
tm->day= (uint) to[3];
tm->neg= 0;
tm->second_part= (length > 7) ? (ulong) sint4korr(to+7) : 0;
return length;
}
@ -3159,7 +3227,7 @@ static void send_data_time(MYSQL_BIND *param, MYSQL_TIME ltime,
}
}
}
/* Fetch data to buffers */