I have typically always used one of the VB CType functions (not CType itself
but CInt, CString, etc...) to cast/convert an input value to its proper type
before passing it as a parameter to a SQL stored procedure. I recently came
accross one I did not know how to handle though... TinyInt. I have an SQL
field of type TinyInt which is an 8bit integer. I came accross a ToInt16()
vb function but not one for an 8 bit 'TinyInt'. So I next just went ahead
and tried to submit the value as is to the stored procedure to see if there
would be a problem. The value is a string (from a
dropdownListBox .SelectedItem.T ext). To my suprise there was no error. It
took the value fine. The SQL stored procedure was expecting a TinyInt as
declared in the stored procedure. ??
1) Is there some type of auto-conversion in place? have I been wasting time
and/or slowing performance converting/casting myself all this time?
2) does the SQL stored procedure convert it itself since that is what was
declared within it?
any info would be greatly appreciated. Thanks.
7  1631 
SqlParameter.Va lue is of type Object, which suggest that everything is taken
care of internally and casting is indeed not required. Of course, to
confirm this assumption, we get Reflector and look at the disassembled code
for how SqlParameter.se t_Value works.
We see that it calls something called SetTypeInfoFrom ComType which in turn
calls a static function GetMetaType of an internal class named MetaType.
This is the function that seems to be doing all the work..stuff like:
case TypeCode.DBNull :
throw ADP.InvalidData Type(TypeCode.D BNull);
case TypeCode.Boolea n:
return MetaType.metaTy peMap[2];
case TypeCode.Char:
throw ADP.InvalidData Type(TypeCode.C har);
case TypeCode.SByte:
throw ADP.InvalidData Type(TypeCode.S Byte);
case TypeCode.Byte
return MetaType.metaTy peMap[20];
case TypeCode.Int16
return MetaType.metaTy peMap[0x10];
Also, FIY, TinyInt is a value from 0-255, which in .Net maps to a Byte and
not an Int16.
Karl
--
MY ASP.Net tutorials http://www.openmymind.net/
"djc" <no***@nowhere. com> wrote in message
news:%2******** *******@TK2MSFT NGP11.phx.gbl.. . I have typically always used one of the VB CType functions (not CType
itself but CInt, CString, etc...) to cast/convert an input value to its proper
type before passing it as a parameter to a SQL stored procedure. I recently
came accross one I did not know how to handle though... TinyInt. I have an SQL
field of type TinyInt which is an 8bit integer. I came accross a ToInt16()
vb function but not one for an 8 bit 'TinyInt'. So I next just went ahead
and tried to submit the value as is to the stored procedure to see if
there would be a problem. The value is a string (from a
dropdownListBox .SelectedItem.T ext). To my suprise there was no error. It
took the value fine. The SQL stored procedure was expecting a TinyInt as
declared in the stored procedure. ??
1) Is there some type of auto-conversion in place? have I been wasting
time and/or slowing performance converting/casting myself all this time?
2) does the SQL stored procedure convert it itself since that is what was
declared within it?
any info would be greatly appreciated. Thanks.
the sql sp declares the datatype. when you call the client libary, you pass
an object and tell the client lib the actual datatype of your data. the
client lib will then convert the datatype to the matching sqldatatype, and
pass sql datatype to the sqlserver. the sqlserver than converts the passed
sql datatype to the sp dataype if it can. see the sql Convert function doc's
to see the supported conversions.
-- bruce (sqlwork.com)
"djc" <no***@nowhere. com> wrote in message
news:%2******** *******@TK2MSFT NGP11.phx.gbl.. .
| I have typically always used one of the VB CType functions (not CType
itself
| but CInt, CString, etc...) to cast/convert an input value to its proper
type
| before passing it as a parameter to a SQL stored procedure. I recently
came
| accross one I did not know how to handle though... TinyInt. I have an SQL
| field of type TinyInt which is an 8bit integer. I came accross a ToInt16()
| vb function but not one for an 8 bit 'TinyInt'. So I next just went ahead
| and tried to submit the value as is to the stored procedure to see if
there
| would be a problem. The value is a string (from a
| dropdownListBox .SelectedItem.T ext). To my suprise there was no error. It
| took the value fine. The SQL stored procedure was expecting a TinyInt as
| declared in the stored procedure. ??
|
| 1) Is there some type of auto-conversion in place? have I been wasting
time
| and/or slowing performance converting/casting myself all this time?
|
| 2) does the SQL stored procedure convert it itself since that is what was
| declared within it?
|
| any info would be greatly appreciated. Thanks.
|
|
My newsreader shows my reply to this as deleted...so I'll try again...sorry
for the possible double post:
SqlParameter.Va lue is of type Object, which suggest that everything is taken
care of internally and casting is indeed not required. Of course, to
confirm this assumption, we get Reflector and look at the disassembled code
for how SqlParameter.se t_Value works.
We see that it calls something called SetTypeInfoFrom ComType which in turn
calls a static function GetMetaType of an internal class named MetaType.
This is the function that seems to be doing all the work..stuff like:
case TypeCode.DBNull :
throw ADP.InvalidData Type(TypeCode.D BNull);
case TypeCode.Boolea n:
return MetaType.metaTy peMap[2];
case TypeCode.Char:
throw ADP.InvalidData Type(TypeCode.C har);
case TypeCode.SByte:
throw ADP.InvalidData Type(TypeCode.S Byte);
case TypeCode.Byte
return MetaType.metaTy peMap[20];
case TypeCode.Int16
return MetaType.metaTy peMap[0x10];
Also, FIY, TinyInt is a value from 0-255, which in .Net maps to a Byte and
not an Int16.
--
MY ASP.Net tutorials http://www.openmymind.net/
"djc" <no***@nowhere. com> wrote in message
news:%2******** *******@TK2MSFT NGP11.phx.gbl.. . I have typically always used one of the VB CType functions (not CType
itself but CInt, CString, etc...) to cast/convert an input value to its proper
type before passing it as a parameter to a SQL stored procedure. I recently
came accross one I did not know how to handle though... TinyInt. I have an SQL
field of type TinyInt which is an 8bit integer. I came accross a ToInt16()
vb function but not one for an 8 bit 'TinyInt'. So I next just went ahead
and tried to submit the value as is to the stored procedure to see if
there would be a problem. The value is a string (from a
dropdownListBox .SelectedItem.T ext). To my suprise there was no error. It
took the value fine. The SQL stored procedure was expecting a TinyInt as
declared in the stored procedure. ??
1) Is there some type of auto-conversion in place? have I been wasting
time and/or slowing performance converting/casting myself all this time?
2) does the SQL stored procedure convert it itself since that is what was
declared within it?
any info would be greatly appreciated. Thanks.
Thank you for the excellently explained answer. I appreciate it greatly.
"Karl Seguin" <karl REMOVE @ REMOVE openmymind REMOVEMETOO . ANDME net>
wrote in message news:OM******** ******@TK2MSFTN GP10.phx.gbl... SqlParameter.Va lue is of type Object, which suggest that everything is
taken care of internally and casting is indeed not required. Of course, to
confirm this assumption, we get Reflector and look at the disassembled
code for how SqlParameter.se t_Value works.
We see that it calls something called SetTypeInfoFrom ComType which in
turn calls a static function GetMetaType of an internal class named MetaType.
This is the function that seems to be doing all the work..stuff like:
case TypeCode.DBNull :
throw ADP.InvalidData Type(TypeCode.D BNull);
case TypeCode.Boolea n:
return MetaType.metaTy peMap[2];
case TypeCode.Char:
throw ADP.InvalidData Type(TypeCode.C har);
case TypeCode.SByte:
throw ADP.InvalidData Type(TypeCode.S Byte);
case TypeCode.Byte
return MetaType.metaTy peMap[20];
case TypeCode.Int16
return MetaType.metaTy peMap[0x10];
Also, FIY, TinyInt is a value from 0-255, which in .Net maps to a Byte and
not an Int16.
Karl
--
MY ASP.Net tutorials
http://www.openmymind.net/
"djc" <no***@nowhere. com> wrote in message
news:%2******** *******@TK2MSFT NGP11.phx.gbl.. . I have typically always used one of the VB CType functions (not CType
itself but CInt, CString, etc...) to cast/convert an input value to its proper
type before passing it as a parameter to a SQL stored procedure. I recently
came accross one I did not know how to handle though... TinyInt. I have an
SQL field of type TinyInt which is an 8bit integer. I came accross a
ToInt16() vb function but not one for an 8 bit 'TinyInt'. So I next just went
ahead and tried to submit the value as is to the stored procedure to see if
there would be a problem. The value is a string (from a
dropdownListBox .SelectedItem.T ext). To my suprise there was no error. It
took the value fine. The SQL stored procedure was expecting a TinyInt as
declared in the stored procedure. ??
1) Is there some type of auto-conversion in place? have I been wasting
time and/or slowing performance converting/casting myself all this time?
2) does the SQL stored procedure convert it itself since that is what
was declared within it?
any info would be greatly appreciated. Thanks.
My newsreader shows both posts... but since your original is showing deleted
to you I am thanking you in both places to make sure you get the proper
thanks. Thanks!
Thank you for the excellently explained answer. I appreciate it greatly.
"Karl Seguin" <karl REMOVE @ REMOVE openmymind REMOVEMETOO . ANDME net>
wrote in message news:O%******** *******@TK2MSFT NGP11.phx.gbl.. . My newsreader shows my reply to this as deleted...so I'll try
again...sorry for the possible double post:
SqlParameter.Va lue is of type Object, which suggest that everything is
taken care of internally and casting is indeed not required. Of course, to
confirm this assumption, we get Reflector and look at the disassembled
code for how SqlParameter.se t_Value works.
We see that it calls something called SetTypeInfoFrom ComType which in
turn calls a static function GetMetaType of an internal class named MetaType.
This is the function that seems to be doing all the work..stuff like:
case TypeCode.DBNull :
throw ADP.InvalidData Type(TypeCode.D BNull);
case TypeCode.Boolea n:
return MetaType.metaTy peMap[2];
case TypeCode.Char:
throw ADP.InvalidData Type(TypeCode.C har);
case TypeCode.SByte:
throw ADP.InvalidData Type(TypeCode.S Byte);
case TypeCode.Byte
return MetaType.metaTy peMap[20];
case TypeCode.Int16
return MetaType.metaTy peMap[0x10];
Also, FIY, TinyInt is a value from 0-255, which in .Net maps to a Byte and
not an Int16.
--
MY ASP.Net tutorials
http://www.openmymind.net/
"djc" <no***@nowhere. com> wrote in message
news:%2******** *******@TK2MSFT NGP11.phx.gbl.. . I have typically always used one of the VB CType functions (not CType
itself but CInt, CString, etc...) to cast/convert an input value to its proper
type before passing it as a parameter to a SQL stored procedure. I recently
came accross one I did not know how to handle though... TinyInt. I have an
SQL field of type TinyInt which is an 8bit integer. I came accross a
ToInt16() vb function but not one for an 8 bit 'TinyInt'. So I next just went
ahead and tried to submit the value as is to the stored procedure to see if
there would be a problem. The value is a string (from a
dropdownListBox .SelectedItem.T ext). To my suprise there was no error. It
took the value fine. The SQL stored procedure was expecting a TinyInt as
declared in the stored procedure. ??
1) Is there some type of auto-conversion in place? have I been wasting
time and/or slowing performance converting/casting myself all this time?
2) does the SQL stored procedure convert it itself since that is what
was declared within it?
any info would be greatly appreciated. Thanks.
great! thank you!
"bruce barker" <no***********@ safeco.com> wrote in message
news:ub******** ******@TK2MSFTN GP09.phx.gbl... the sql sp declares the datatype. when you call the client libary, you
pass an object and tell the client lib the actual datatype of your data. the
client lib will then convert the datatype to the matching sqldatatype, and
pass sql datatype to the sqlserver. the sqlserver than converts the passed
sql datatype to the sp dataype if it can. see the sql Convert function
doc's to see the supported conversions.
-- bruce (sqlwork.com)
"djc" <no***@nowhere. com> wrote in message
news:%2******** *******@TK2MSFT NGP11.phx.gbl.. .
| I have typically always used one of the VB CType functions (not CType
itself
| but CInt, CString, etc...) to cast/convert an input value to its proper
type
| before passing it as a parameter to a SQL stored procedure. I recently
came
| accross one I did not know how to handle though... TinyInt. I have an
SQL | field of type TinyInt which is an 8bit integer. I came accross a
ToInt16() | vb function but not one for an 8 bit 'TinyInt'. So I next just went
ahead | and tried to submit the value as is to the stored procedure to see if
there
| would be a problem. The value is a string (from a
| dropdownListBox .SelectedItem.T ext). To my suprise there was no error. It
| took the value fine. The SQL stored procedure was expecting a TinyInt as
| declared in the stored procedure. ??
|
| 1) Is there some type of auto-conversion in place? have I been wasting
time
| and/or slowing performance converting/casting myself all this time?
|
| 2) does the SQL stored procedure convert it itself since that is what
was | declared within it?
|
| any info would be greatly appreciated. Thanks.
|
|
I know this is an old and dormant thread, but can anyone tell me where the equivalences between SQL data types (int, datetime, varchar, nvarchar, text, etc.) and the ASP.NET parameter types (int32, String, etc.) are documented?
TIA.
-- Ned
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