Created
September 26, 2013 06:56
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A simple TSQL script to quickly generate c# POCO classes from SQL Server tables and views. You may tweak the output as needed. Not all datatypes are represented but this should save a bunch of boilerplate coding. USAGE: Run this query against the database of your choice. The script will loop through tables, views and their respective columns. Re…
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| declare @tableName varchar(200) | |
| declare @columnName varchar(200) | |
| declare @nullable varchar(50) | |
| declare @datatype varchar(50) | |
| declare @maxlen int | |
| declare @sType varchar(50) | |
| declare @sProperty varchar(200) | |
| DECLARE table_cursor CURSOR FOR | |
| SELECT TABLE_NAME | |
| FROM [INFORMATION_SCHEMA].[TABLES] | |
| OPEN table_cursor | |
| FETCH NEXT FROM table_cursor | |
| INTO @tableName | |
| WHILE @@FETCH_STATUS = 0 | |
| BEGIN | |
| PRINT 'public class ' + @tableName + ' {' | |
| DECLARE column_cursor CURSOR FOR | |
| SELECT COLUMN_NAME, IS_NULLABLE, DATA_TYPE, isnull(CHARACTER_MAXIMUM_LENGTH,'-1') | |
| from [INFORMATION_SCHEMA].[COLUMNS] | |
| WHERE [TABLE_NAME] = @tableName | |
| order by [ORDINAL_POSITION] | |
| OPEN column_cursor | |
| FETCH NEXT FROM column_cursor INTO @columnName, @nullable, @datatype, @maxlen | |
| WHILE @@FETCH_STATUS = 0 | |
| BEGIN | |
| -- datatype | |
| select @sType = case @datatype | |
| when 'int' then 'Int32' | |
| when 'decimal' then 'Decimal' | |
| when 'money' then 'Decimal' | |
| when 'char' then 'String' | |
| when 'nchar' then 'String' | |
| when 'varchar' then 'String' | |
| when 'nvarchar' then 'String' | |
| when 'uniqueidentifier' then 'Guid' | |
| when 'datetime' then 'DateTime' | |
| when 'bit' then 'Boolean' | |
| else 'String' | |
| END | |
| If (@nullable = 'NO') | |
| PRINT '[Required]' | |
| if (@sType = 'String' and @maxLen <> '-1') | |
| Print '[MaxLength(' + convert(varchar(4),@maxLen) + ')]' | |
| SELECT @sProperty = 'public ' + @sType + ' ' + @columnName + ' { get; set;}' | |
| PRINT @sProperty | |
| print '' | |
| FETCH NEXT FROM column_cursor INTO @columnName, @nullable, @datatype, @maxlen | |
| END | |
| CLOSE column_cursor | |
| DEALLOCATE column_cursor | |
| print '}' | |
| print '' | |
| FETCH NEXT FROM table_cursor | |
| INTO @tableName | |
| END | |
| CLOSE table_cursor | |
| DEALLOCATE table_cursor |
This is awesome
This is a very good and useful script. Thanks
Fantastic script.
cool
You should add
when 'datetime2' then 'DateTime'
That's so Nice
declare @tableName varchar(200)
declare @columnName varchar(200)
declare @nullable varchar(50)
declare @datatype varchar(50)
declare @maxlen int
declare @Stype varchar(50)
declare @Sproperty varchar(200)
DECLARE table_cursor CURSOR FOR
SELECT TABLE_NAME
FROM [INFORMATION_SCHEMA].[TABLES] where TABLE_NAME ='EmployeeWorkingDay'
OPEN table_cursor
FETCH NEXT FROM table_cursor
INTO @tableName
WHILE @@FETCH_STATUS = 0
BEGIN
PRINT 'public class ' + @tableName + ' {'
PRINT ''
DECLARE column_cursor CURSOR FOR
SELECT COLUMN_NAME, IS_NULLABLE, DATA_TYPE, isnull(CHARACTER_MAXIMUM_LENGTH,'-1')
from [INFORMATION_SCHEMA].[COLUMNS]
WHERE [TABLE_NAME] = @tableName
order by [ORDINAL_POSITION]
OPEN column_cursor
FETCH NEXT FROM column_cursor INTO @columnName, @nullable, @datatype, @maxlen
WHILE @@FETCH_STATUS = 0
BEGIN
-- datatype
select @sType = case @datatype
when 'int' then 'Int'
when 'decimal' then 'Decimal'
when 'money' then 'Decimal'
when 'char' then 'String'
when 'nchar' then 'String'
when 'varchar' then 'String'
when 'nvarchar' then 'String'
when 'uniqueidentifier' then 'Guid'
when 'datetime' then 'DateTime'
when 'bit' then 'Boolean'
else 'String'
END
--If (@nullable = 'NO')
-- PRINT '[Required]'
--if (@sType = 'String' and @maxLen <> '-1')
-- Print '[MaxLength(' + convert(varchar(4),@maxLen) + ')]'
SELECT @sProperty = 'public ' + @sType + ' ' + @columnName + ' { get; set;}'
PRINT @sProperty
print ''
FETCH NEXT FROM column_cursor INTO @columnName, @nullable, @datatype, @maxlen
END
CLOSE column_cursor
DEALLOCATE column_cursor
print '}'
print ''
FETCH NEXT FROM table_cursor
INTO @tableName
END
CLOSE table_cursor
DEALLOCATE table_cursor
For 1 Table Only
Great script, Thank you.
thanks
Great!
Thank you. :)
Beatifult...
Thank you..
I may toy with this. Interesting. Thanks!
I've made some small changes. I added some missing types and worked a bit with formatting. I also added [Key] to the first property (usually the primary key).
declare @tableName varchar(200)
declare @columnName varchar(200)
declare @nullable varchar(50)
declare @datatype varchar(50)
declare @maxlen int
declare @pos int
declare @Stype varchar(50)
declare @Sproperty varchar(200)
DECLARE table_cursor CURSOR FOR
SELECT TABLE_NAME
FROM [INFORMATION_SCHEMA].[TABLES]
WHERE TABLE_NAME = 'WorkOrderCategory'
OPEN table_cursor
FETCH NEXT FROM table_cursor
INTO @tableName
WHILE @@FETCH_STATUS = 0
BEGIN
PRINT 'public class ' + @tableName + ' {'
DECLARE column_cursor CURSOR FOR
SELECT COLUMN_NAME, IS_NULLABLE, DATA_TYPE, isnull(CHARACTER_MAXIMUM_LENGTH,'-1'), ORDINAL_POSITION
from [INFORMATION_SCHEMA].[COLUMNS]
WHERE [TABLE_NAME] = @tableName
order by [ORDINAL_POSITION]
OPEN column_cursor
FETCH NEXT FROM column_cursor INTO @columnName, @nullable, @datatype, @maxlen, @pos
WHILE @@FETCH_STATUS = 0
BEGIN
-- datatype
select @sType = case @datatype
when 'int' then 'int'
when 'decimal' then 'Decimal'
when 'money' then 'Decimal'
when 'char' then 'string'
when 'nchar' then 'string'
when 'smallint' then 'short'
when 'varchar' then 'string'
when 'nvarchar' then 'string'
when 'uniqueidentifier' then 'Guid'
when 'datetime' then 'DateTime'
when 'bit' then 'bool'
else 'string'
END
If (@pos = 1)
PRINT ' [Key]'
If (@nullable = 'NO')
PRINT ' [Required]'
if (@sType = 'string' and @maxLen <> '-1')
Print ' [MaxLength(' + convert(varchar(4),@maxLen) + ')]'
SELECT @sProperty = ' public ' + @sType + ' ' + @columnName + ' { get; set; }'
PRINT @sProperty
--print ''
FETCH NEXT FROM column_cursor INTO @columnName, @nullable, @datatype, @maxlen, @pos
END
CLOSE column_cursor
DEALLOCATE column_cursor
print '}'
print ''
FETCH NEXT FROM table_cursor
INTO @tableName
END
CLOSE table_cursor
DEALLOCATE table_cursor
OMG! So much time saved. Massive thanks.
I have made an addition of some datatypes and also add "?" for nullable fields.
declare @tableName varchar(200)
declare @columnName varchar(200)
declare @nullable varchar(50)
declare @datatype varchar(50)
declare @maxlen int
declare @pos int
declare @Stype varchar(50)
declare @isnullable varchar(1)
declare @Sproperty varchar(200)
DECLARE table_cursor CURSOR FOR
SELECT TABLE_NAME
FROM [INFORMATION_SCHEMA].[TABLES]
OPEN table_cursor
FETCH NEXT FROM table_cursor
INTO @tableName
WHILE @@FETCH_STATUS = 0
BEGIN
PRINT 'public class ' + @tableName + ' {'
DECLARE column_cursor CURSOR FOR
SELECT COLUMN_NAME, IS_NULLABLE, DATA_TYPE, isnull(CHARACTER_MAXIMUM_LENGTH,'-1'), ORDINAL_POSITION
, CASE WHEN (IS_NULLABLE = 'NO') THEN ''
ELSE
CASE WHEN (DATA_TYPE IN ('char','nchar','varchar','nvarchar')) THEN '' ELSE '?' END
END
from [INFORMATION_SCHEMA].[COLUMNS]
WHERE [TABLE_NAME] = @tableName
order by [ORDINAL_POSITION]
OPEN column_cursor
FETCH NEXT FROM column_cursor INTO @columnName, @nullable, @datatype, @maxlen, @pos, @isNullable
WHILE @@FETCH_STATUS = 0
BEGIN
-- datatype
select @sType = case @datatype
when 'int' then 'int'
when 'smallint' then 'short'
when 'bigint' then 'long'
when 'decimal' then 'Decimal'
when 'money' then 'Decimal'
when 'char' then 'string'
when 'nchar' then 'string'
when 'smallint' then 'short'
when 'varchar' then 'string'
when 'nvarchar' then 'string'
when 'uniqueidentifier' then 'Guid'
when 'datetime' then 'DateTime'
when 'bit' then 'bool'
else 'string'
END
If (@pos = 1)
PRINT ' [Key]'
If (@nullable = 'NO' AND @pos > 1)
PRINT ' [Required]'
if (@sType = 'string' and @maxLen <> '-1')
PRINT ' [MaxLength(' + convert(varchar(4),@maxLen) + ')]'
if (@sType = 'datetime')
PRINT ' [Column(TypeName = "datetime")]'
SELECT @sProperty = ' public ' + @sType + @isNullable + ' ' + @columnName + ' { get; set; }'
PRINT @sProperty
--print ''
FETCH NEXT FROM column_cursor INTO @columnName, @nullable, @datatype, @maxlen, @pos, @isNullable
END
CLOSE column_cursor
DEALLOCATE column_cursor
print '}'
print ''
FETCH NEXT FROM table_cursor
INTO @tableName
END
CLOSE table_cursor
DEALLOCATE table_cursor
Thank you very much, life-saving :)
Fantastic - saved me a ton of time. Works perfectly.
Great
Hey, some suggestions:
based on https://docs.microsoft.com/en-us/dotnet/framework/data/adonet/sql-server-data-type-mappings
| SQL type | CLR type |
|---|---|
float |
double |
unknown |
byte[] (most likely) |
varbinary(x) |
byte[] |
tinyint |
byte |
Thank you, very helpful script
very helpful
Thanks, I made my simplified version without using cursor, for single table:
declare @tableName varchar(200) = 'Compensation'
SELECT 'public class ' + @tableName + ' {'
UNION ALL
SELECT
' '+ COLUMN_NAME + ' ' + case DATA_TYPE
when 'int' then 'int'
when 'decimal' then 'decimal'
when 'money' then 'decimal'
when 'char' then 'string'
when 'nchar' then 'string'
when 'smallint' then 'short'
when 'varchar' then 'string'
when 'nvarchar' then 'string'
when 'uniqueidentifier' then 'Guid'
when 'datetime' then 'DateTime'
when 'bit' then 'bool'
else 'string'
END
+ case when IS_NULLABLE = 'YES' and DATA_TYPE in ('int', 'money', 'smalldatetime', 'datetime', 'bit', 'float', 'decimal') then '?' else '' end
+ ' { get; set; }'
from [INFORMATION_SCHEMA].[COLUMNS]
WHERE [TABLE_NAME] = @tableName
UNION ALL
SELECT '}'
This is a real gem for any developer in .Net. Thanks for this.
I have added a few lines of code to the original code, so that a developer can generate POCO for only one table or a comma-delimited list of table names. The new logic is marked by START and END comments in code below. To generate POCO for all tables, simply do not set the variable @tableNameForPOCO.
declare @tableName varchar(200)
declare @columnName varchar(200)
declare @nullable varchar(50)
declare @datatype varchar(50)
declare @maxlen int
declare @pos int
declare @Stype varchar(50)
declare @isnullable varchar(1)
declare @Sproperty varchar(200)
---START of new logic to limit to certain tables only---
DECLARE @tableNameForPOCO VARCHAR(200)--limits POCO class generation to only mentioned table(s)
--SET @tableNameForPOCO = 'Table1,Table2,Table3'--@tableNameForPOCO can be null to mean all tables
--or it can be set to a comma-delimited list of table names
--there should be no space(s) before and after each comma in this list
DECLARE table_cursor CURSOR FOR
SELECT TABLE_NAME
FROM [INFORMATION_SCHEMA].[TABLES] WHERE CASE
WHEN ISNULL(@tableNameForPOCO, TABLE_NAME) LIKE ('%,' + TABLE_NAME + ',%') THEN 1
WHEN ISNULL(@tableNameForPOCO, TABLE_NAME) LIKE (TABLE_NAME + ',%') THEN 1
WHEN ISNULL(@tableNameForPOCO, TABLE_NAME) LIKE ('%,' + TABLE_NAME) THEN 1
WHEN ISNULL(@tableNameForPOCO, TABLE_NAME) LIKE TABLE_NAME THEN 1
ELSE 0
END = 1
---END of new logic to limit to certain tables only---
OPEN table_cursor
FETCH NEXT FROM table_cursor
INTO @tableName
WHILE @@FETCH_STATUS = 0
BEGIN
PRINT 'public class ' + @tableName + ' {'
DECLARE column_cursor CURSOR FOR
SELECT COLUMN_NAME, IS_NULLABLE, DATA_TYPE, isnull(CHARACTER_MAXIMUM_LENGTH,'-1'), ORDINAL_POSITION
, CASE WHEN (IS_NULLABLE = 'NO') THEN ''
ELSE
CASE WHEN (DATA_TYPE IN ('char','nchar','varchar','nvarchar')) THEN '' ELSE '?' END
END
from [INFORMATION_SCHEMA].[COLUMNS]
WHERE [TABLE_NAME] = @tableName
order by [ORDINAL_POSITION]
OPEN column_cursor
FETCH NEXT FROM column_cursor INTO @columnName, @nullable, @datatype, @maxlen, @pos, @isNullable
WHILE @@FETCH_STATUS = 0
BEGIN
-- datatype
select @sType = case @datatype
when 'int' then 'int'
when 'smallint' then 'short'
when 'bigint' then 'long'
when 'decimal' then 'Decimal'
when 'money' then 'Decimal'
when 'char' then 'string'
when 'nchar' then 'string'
when 'smallint' then 'short'
when 'varchar' then 'string'
when 'nvarchar' then 'string'
when 'uniqueidentifier' then 'Guid'
when 'datetime' then 'DateTime'
when 'bit' then 'bool'
else 'string'
END
If (@pos = 1)
PRINT ' [Key]'
If (@nullable = 'NO' AND @pos > 1)
PRINT ' [Required]'
if (@sType = 'string' and @maxLen <> '-1')
PRINT ' [MaxLength(' + convert(varchar(4),@maxLen) + ')]'
if (@sType = 'datetime')
PRINT ' [Column(TypeName = "datetime")]'
SELECT @sProperty = ' public ' + @sType + @isNullable + ' ' + @columnName + ' { get; set; }'
PRINT @sProperty
--print ''
FETCH NEXT FROM column_cursor INTO @columnName, @nullable, @datatype, @maxlen, @pos, @isNullable
END
CLOSE column_cursor
DEALLOCATE column_cursor
print '}'
print ''
FETCH NEXT FROM table_cursor
INTO @tableName
END
CLOSE table_cursor
DEALLOCATE table_cursor
Thanks a lot,
I added Float Double management plus KEY
alter procedure usp_generate @tableName_arg varchar(200)
as
/*
example
exec usp_generate @tableName_arg = 'P_SECONDO'
*/
BEGIN
set nocount on;
declare @tableName varchar(200)
declare @columnName varchar(200)
declare @nullable varchar(50)
declare @datatype varchar(50)
declare @maxlen int
declare @sType varchar(50)
declare @sProperty varchar(200)
declare @IsKey int;
declare @col_ordinal int;
DECLARE table_cursor CURSOR FAST_FORWARD FOR
SELECT TABLE_NAME
FROM [INFORMATION_SCHEMA].[TABLES] T
where t.TABLE_TYPE = 'BASE TABLE'
and not ( TABLE_NAME LIKE 'sys%' or TABLE_NAME LIKE 'MSMerg%' OR TABLE_NAME LIKE 'MSRepl%' OR TABLE_NAME LIKE 'MSDynam%' )
and TABLE_NAME = @tableName_arg
order by TABLE_NAME asc;
OPEN table_cursor
FETCH NEXT FROM table_cursor
INTO @tableName
WHILE @@FETCH_STATUS = 0
BEGIN
PRINT 'public class ' + @tableName + ' {'
PRINT '';
PRINT ' #region column_scaffolding';
PRINT '';
DECLARE column_cursor CURSOR FAST_FORWARD FOR
with cte_pk as (
SELECT Col.Column_Name from
INFORMATION_SCHEMA.TABLE_CONSTRAINTS Tab,
INFORMATION_SCHEMA.CONSTRAINT_COLUMN_USAGE Col
WHERE
Col.Constraint_Name = Tab.Constraint_Name
AND Col.Table_Name = Tab.Table_Name
AND Tab.Constraint_Type = 'PRIMARY KEY'
AND Col.Table_Name = @tableName
)
SELECT C.COLUMN_NAME, IS_NULLABLE, DATA_TYPE, isnull(CHARACTER_MAXIMUM_LENGTH,'-1') ,
C.ORDINAL_POSITION, case when cte_pk.Column_Name is not null then 1 else 0 end as PK
--, C.*
from [INFORMATION_SCHEMA].[COLUMNS] C
left outer join cte_pk
on C.COLUMN_NAME = cte_pk.Column_Name
WHERE [TABLE_NAME] = @tableName
order by C.[ORDINAL_POSITION];
OPEN column_cursor
FETCH NEXT FROM column_cursor INTO @columnName, @nullable, @datatype, @maxlen, @col_ordinal, @IsKey
WHILE @@FETCH_STATUS = 0
BEGIN
-- datatype
select @sType = case @datatype
when 'int' then 'Int32'
when 'decimal' then 'Decimal'
when 'money' then 'Decimal'
when 'char' then 'String'
when 'nchar' then 'String'
when 'varchar' then 'String'
when 'nvarchar' then 'String'
when 'uniqueidentifier' then 'Guid'
when 'datetime' then 'DateTime'
when 'bit' then 'Boolean'
when 'float' then 'Double'
else 'String'
END
If (@IsKey = 1)
PRINT ' [Key]';
If (@nullable = 'NO')
PRINT ' [Required]'
raiserror(' [Column(Order=%d)]',10,0,@col_ordinal);
if (@sType = 'String' and @maxLen <> '-1')
PRINT ' [MaxLength(' + convert(varchar(4),@maxLen) + ')]'
SELECT @sProperty = ' public ' + @sType + ' ' + @columnName + ' { get; set;}'
PRINT @sProperty
print ''
FETCH NEXT FROM column_cursor INTO @columnName, @nullable, @datatype, @maxlen, @col_ordinal, @IsKey
END
CLOSE column_cursor
DEALLOCATE column_cursor
PRINT ' #endregion';
print ''
print '}'
print ''
FETCH NEXT FROM table_cursor
INTO @tableName
END
CLOSE table_cursor
DEALLOCATE table_cursor;
END;
output example:
public class P_SECONDO {
#region column_scaffolding
[Key]
[Required]
[Column(Order=1)]
public Int32 id { get; set;}
[Column(Order=2)]
[MaxLength(30)]
public String desc1 { get; set;}
[Required]
[Column(Order=3)]
public Guid rowguid { get; set;}
[Column(Order=4)]
public Decimal my_decimal { get; set;}
[Column(Order=5)]
public Double my_float { get; set;}
#endregion
}
That's a very good observation you made. I missed seeing that double type is not there in the logic.
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Yes awesome. Good work. Thanks!