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 |
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
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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]
END
CLOSE table_cursor
DEALLOCATE table_cursor