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TSQL snippet: table to .Net class generator Expand / Collapse
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Posted Friday, June 13, 2008 3:22 AM


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Heres a snippet for generating a VB.net class from a table, just replace the target table name

just a few tweaks and you can generate one for C#

cheers!

declare @field table (fieldname varchar(50), fieldtype varchar(50))
declare @table_name varchar(50)
set @table_name = 'TargetTable' -- this is the table name

insert into @field
Select sc.name, st.name
from
sysobjects so,
syscolumns sc,
systypes st
where
so.id = sc.id
and so.xtype = 'U'
and so.name = @table_name
and st.xtype = sc.xtype

print 'Public Class ' + @table_name

declare @fieldname varchar(50)
declare @fieldtype varchar(50)
declare @constructor varchar(500)
declare @assign varchar(500)

declare cur cursor for
select fieldname, fieldtype
from @field

open cur

fetch next from cur
into @fieldname, @fieldtype

set @constructor = ''
set @assign = ''

while @@fetch_status = 0
begin
set @fieldtype = case @fieldtype
when 'int' then 'Int32'
when 'tinyint' then 'Int32'
when 'varchar' then 'String'
when 'bit' then 'Boolean'
when 'float' then 'Double'
when 'datetime' then 'Datetime'
else @fieldtype
end

set @constructor = @constructor + 'ByVal v' + @fieldname + ' AS ' + @fieldtype + ', '
set @assign = @assign + '_' + @fieldname + ' = v' + @fieldname + ' : '

print ''
print 'Private _' + @fieldname + ' AS ' + @fieldtype
print 'Public Property ' + @fieldname + '() AS ' + @fieldtype
print ' Get'
print ' return _' + @fieldname
print ' End Get'
print ' Set (value AS ' + @fieldtype + ')'
print ' _' + @fieldname + ' = value'
print ' End Set'
print 'End Property'
print ''

fetch next from cur
into @fieldname, @fieldtype
end

print 'Public Sub New(' + substring(@constructor, 0, len(@constructor)) + ')'
print ' ' + substring(@assign, 0, len(@assign) -1)
print 'End Sub'

print 'End Class'







slow down when you need to hurry, stop when you need to move on,
look back when you need to forget, or you might slip and leave sanity
Post #516496
Posted Thursday, June 19, 2008 9:06 PM
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nice article... tnx
Post #520311
Posted Thursday, June 26, 2008 10:59 AM
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Make sure you post this to the site script library and note it a bit better. As well you should do one for C# to ensure your work is credited.


Post #524406
Posted Thursday, June 26, 2008 8:58 PM


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Here is a vesion without any Cursors:
create proc spVB_Make_Class as
--from Lambert Antonio, 26-jun-2008

Set NoCount ON

declare @field table (id int identity primary key clustered, fieldname varchar(50), fieldtype varchar(50))
declare @table_name varchar(50)
set @table_name = 'TargetTable' -- this is the table name

insert into @field
Select sc.name
, case st.name
when 'int' then 'Int32'
when 'tinyint' then 'Int32'
when 'varchar' then 'String'
when 'bit' then 'Boolean'
when 'float' then 'Double'
when 'datetime' then 'Datetime'
else st.name
end As [name]
from
sysobjects so,
syscolumns sc,
systypes st
where
so.id = sc.id
and so.xtype = 'U'
and so.name = @table_name
and st.xtype = sc.xtype

declare @VB table (id int identity primary key clustered, Line varchar(8000))
declare @constructor table (id int identity(1000000,1) primary key clustered, Line varchar(8000))
declare @assign table (id int identity(1000000,1) primary key clustered, Line varchar(8000))

Insert into @VB(Line) Select 'Public Class ' + @table_name

Insert into @VB(Line)
Select '
Private _' + fieldname + ' AS ' + fieldtype + '
Public Property ' + fieldname + '() AS ' + fieldtype + '
Get
return _' + fieldname + '
End Get
Set (value AS ' + fieldtype + ')
_' + fieldname + ' = value
End Set
End Property
'
From @field
Order By ID


Insert into @constructor(Line)
Select 'ByVal v' + fieldname + ' AS ' + fieldtype + ', '
From @field
Order By ID

Insert into @assign(Line)
Select '_' + fieldname + ' = v' + fieldname
From @field
Order By ID


Insert into @VB(Line) Select ' Public Sub New('
Insert into @VB(Line) Select ' ' + Line From @constructor Order By ID
Insert into @VB(Line) Select ' )'
Insert into @VB(Line) Select ' ' + Line From @assign Order By ID
Insert into @VB(Line) Select '
End Sub

End Class'

Select Line From @VB Order By ID



-- RBarryYoung, (302)375-0451 blog: MovingSQL.com, Twitter: @RBarryYoung
Proactive Performance Solutions, Inc.
"Performance is our middle name."
Post #524713
Posted Friday, June 27, 2008 10:26 AM
Grasshopper

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Last Login: Thursday, September 4, 2014 7:16 AM
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This script is great:D:D I'm beside myself with joy
Below is my first attempt at posting here or anywhere on the net so be kind.

I've converted the vb code to csharpe and it works for me. Thanks to all for their involvment in doing these things that help others.

David Kelly
SQL novice
C# programmer novice
General old guy

create proc spCSharpe_Make_Class as
--from Lambert Antonio, 26-jun-2008
--converted to C# David Kelly, 06/27/2008

Set NoCount ON

declare @field table (id int identity primary key clustered, fieldname varchar(50), fieldtype varchar(50))
declare @table_name varchar(50)
set @table_name = 'JBMTest' -- this is the table name

insert into @field
Select sc.name
, case st.name
--when 'int' then 'Int32'
when 'money' then 'double'
when 'tinyint' then 'int'
when 'varchar' then 'string'
when 'bit' then 'bool'
when 'float' then 'double'
when 'datetime' then 'DateTime'
else st.name
end As [name]
from
sysobjects so,
syscolumns sc,
systypes st
where
so.id = sc.id
and so.xtype = 'U'
and so.name = @table_name
and st.xtype = sc.xtype

declare @CSharpe table (id int identity primary key clustered, Line varchar(8000))
declare @constructor table (id int identity(1000000,1) primary key clustered, Line varchar(8000))
declare @assign table (id int identity(1000000,1) primary key clustered, Line varchar(8000))

Insert into @CSharpe(Line) Select 'using System'
Insert into @CSharpe(Line) Select 'using System.Collections.Generic'
Insert into @CSharpe(Line) Select 'using System.Text';
Insert into @CSharpe(Line) Select ''; -- blank line

Insert into @CSharpe(Line) Select 'namespace MCL' -- Namespace

Insert into @CSharpe(Line) Select '{' -- Namespace
Insert into @CSharpe(Line) Select ' class ' + @table_name -- Class definition
Insert into @CSharpe(Line) Select ' {' -- Class
Insert into @CSharpe(Line)
Select '
private ' + fieldtype + ' m_' +fieldtype + fieldname + ';
public ' + fieldtype + ' prop'+ fieldname + '
{
get { return m_' + fieldname + '; }
set {
m_' +fieldtype+ fieldname + ' = value;
}
}
'
From @field
Order By ID


Insert into @constructor(Line)
Select 'ByVal v' + fieldname + ' AS ' + fieldtype + ', '
From @field
Order By ID

Insert into @assign(Line)
Select '_' + fieldname + ' = v' + fieldname
From @field
Order By ID


Insert into @CSharpe(Line) Select ' public '+ @table_name+'()'
Insert into @CSharpe(Line) Select ' {'
Insert into @CSharpe(Line) Select ' }'

Insert into @CSharpe(Line) Select ' } // do not go below this line' -- End Class'

Insert into @CSharpe(Line) Select '}' -- End namespace
Select Line From @CSharpe Order By ID



Post #525173
Posted Thursday, January 8, 2009 9:00 PM
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Oh my god, I love you!
Post #633056
Posted Thursday, September 6, 2012 3:30 PM
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Awesome!! Thank-you so much. Staring at Linq all day was giving me a headache.
Post #1355641
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